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CONTENTS 1 General Information
1.1 Safety Instructions 1.2 Switching the Operating Voltage 230 V~/115 V~ 1.3 Mains Connection 1.4 Installing the Power Supply Unit 1.5 Switching on 1.6 EMC 1.7 Inspection and Maintenance 1.8 Warranty 1.9 Delivered Accessories

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3 3 4 4 4 4 4 5 5

2 Application 3 Configuration and Functional Description
3.1 Block Diagram 3.2 Description

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4 Technical Data
4.1 General Data 4.2 Specifications 4.2.1 Characteristics of Channel A 4.2.2 Characteristics of Channel C 4.3 Functions 4.3.1 Diagnostic Unit Function (CHECK) 4.3.2 Frequency Measurement on Channel A or B (FREQ A, FREQ B) 4.3.3 Frequency Measurement on Channel C (FREQ C) 4.3.4 Frequency Ratio Measurement on Channels A and B (RAT A/B) 4.3.5 Frequency Ratio Measurement on Channels C and B (RAT C/B) 4.3.6 Period Length Measurement on Channel A or B (PER A, PER B) 4.3.7 Time Interval Measurement on Channel A or B (TIME AB) 4.3.8 Pulse Counting on Channel A or B (TOT A, TOT B) 4.4 Time Base 4.5 Display 4.6 System Interface 4.6.1 Interface GPIB 4.6.2 Interface RS-232C

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5 Control Elements 6 Performance of Measurements
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Operating Instructions UZ 2500 1/2000

6.1 Starting 6.1.1 Selection of Measuring Mode 6.1.2 Adjustments of Input Channels 6.2 Frequency Measurement on Channel A or B (FREQ A, FREQ B) 6.3 Frequency Measurement on Channel C (FREQ C) 6.4 Frequency Ratio Measurement on Channels A and B (RAT A/B) 6.5 Frequency Ratio Measurement on Channels C and B (RAT C/B) 6.6 Period Length Measurement on Channel A or B (PER A, PER B) 6.7 Time Interval Measurement on Channels A and B (TIME AB) 6.7.1 Pulse Width Measurement 6.8 Pulse Counting on Channel A or B (TOT A, TOT B) 6.8.1 Manual Triggering 6.8.2 External Triggering 6.9 Error Message 6.10 Special Unit Functions

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7 Remote Control by Program
7.1 Preparation on the Counter 7.1.1 Interface GPIB (IEEE 488.2) 7.1.1.1 Communication with Control Unit (Personal Computer) 7.1.1.2 Communication without Control Unit (Printer) 7.1.2 Interface RS-232C 7.2 Transition: Remote Control Local Control 7.3 Messages of the Counter on Remote Control 7.3.1 Description of the Unit State 7.3.1.1 ESR - EVENT STATUS REGISTER 7.3.1.2 STB - STATUS BYTE REGISTER 7.3.2 Description of the Unit Messages 7.3.3 Description of the Results 7.3.4 Description of the Errors 7.3.4.1 List of Error Messages 7.4 List of Commands on Remote Control 7.4.1 General Commands 7.4.2 Commands for Setting the Measuring Parameters 7.4.3 Commands for Setting the Measuring Functions 7.4.4 Commands for Reading the Unit Settings 7.5 Measuring by Remote Control 7.6 Program Examples (Q-Basic)

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8 Maintenance 9 Appendix
9.1 Declaration of Conformity

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Operating Instructions UZ 2500 1/2000

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1 General Information
1.1 Safety Instructions

Wherever you see this sign you will find information on potential hazards. Please read these sections with particular care! Warning! Attention! Before opening the instrument disconnect the mains plug! If the fuse has to be changed, use only G fuse-link 5 20 according to IEC 127 (see 4.1)!

1.2

Switching the Operating Voltage 230 V~/115 V~

Your instrument left the factory to 230 V~. Switching to 115 V~ requires the instrument to be opened, which should only be done by trained personnel. Setting the Operating Voltage 115 V~ 1. 2. 3. 4. Disconnect the instrument from the mains. Remove upper caps and loosen the screws below. Identify the mains voltage switch with the following illustration. Switch the voltage mains voltage switch (slide switch) located under the power switch to the indication "115". 5. Remove safety cover at the mains plug and replace the fuse with the fuse for 115 V supplied with the instrument. 6. Fasten upper caps and put the sticker supplied with the instrument for marking the switchover to 115 V on to the type label. Mains Voltage Switch

115 V position

230 V position

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Operating Instructions UZ 2500 1/2000

1.3

Mains Connection

The design of the unit meets the requirements of safety class I according to EN 61010-1, i. e. all metal parts accessible from outside and exposed to contact are connected with the protective conducto of the supply network. Power is supplied via a mains cable with earthing contact.

1.4 Installing the Power Supply Unit
The unit should not be operated close to equipment that develops heat.

1.5 Switching on
The unit is switched on using the power switch at the front. The power switch separates the unit completely from the primary side of the transformer. The LED ON/OFF serves as an operation indicator.

1.6 EMC
The unit is interference-free according to the EN 50081-1 and EN 50082-1. In order to fulfil the limiting values in line with present standards, it is absolutely necessary that only cables which are in perfect condition be connected to the unit. The following information applies here: - Metallic or metallized socket cases must be used for interface RS-232C. The socket cases and the braided screen of the cables must be connected at the shortest distance possible. The signal earth must not be connected to the braided screen. - After opening and closing the unit ensure that if all the fixing parts and contact springs are installed as before that all the screws are fixed and tightly.

1.7 Inspection and Maintenance
If service is needed, due attention should be paid to the regulations according to VDE 0701. The unit should only be repaired by trained personnel.

Operating Instructions UZ 2500 1/2000

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1.8 Warranty
DIGIMESS guarantees the perfect working order of the unit for 12 months as from delivery. There is no warranty for faults arising from improper operation or from changes made to the unit or from inappropriate application. If a fault occurs please contact or send your unit to:

The unit should be sent in appropriate packing - if possible in the original packing. Please enclose a detailed fault report (functions working incorrectly, deviating specifications and so on) including unit type and serial number. Kindly verify warranty cases by enclosing your supply delivery note. Any repairs carried out without reference to a valid warranty will initially be at the owner's expense. Should the warranty have expired, we will, of course, be glad to repair the unit as per our General Terms Of Assembly And Service.

1.9 Delivered Accessories
1 1 2 2 1 1 mains cable fine-wire fuse (T 200 L/250 V ) fine-wire fuses (T 400 L/250 V) coaxial cables operating instructions label for indicating the switch-over to 115 V

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Operating Instructions UZ 2500 1/2000

2 Application
The desk-top measuring instrument UZ 2500 is a compact three-channel counter controlled by a micro-processor which allows frequency measurements of periodic signals via channels A and B within the range of 10 Hz to 100 MHz and via channel C from 50 MHz to 2.4 GHz. Frequency ratios can be measured between channels A and B or C and B. Moreover, it is possible to measure the period length of periodic signals from 1 s to100 ms as well as time intervals from 1 s to100 s. Pulses from 1 to 109 can also be counted via channels A and B. The trigger level can be set and measuring amplitudes up to VPP 50 V can be attenuated at the ratio of 10:1 on channels A and B. Functions and measuring ranges can be set by means of 8 buttons via a menu and they are clearly displayed on a two-line alphanumeric LC matrix display. The units standard equipment includes a parallel interface GPIB (IEEE 488.2) for measuring systems and a serial interface RS-232C for communicating with superior systems. With the exception of trigger level settings for channels A and B, all functions and parameters can be set, measurements performed and measured values as well as the states of the unit can be transferred.

Operating Instructions UZ 2500 1/2000

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3 Configuration and Functional Description
3.1 Block Diagram
Time Base 1 Shaper 2 Programmable Divider 4 Start/ Stop Circuit 13 Power Supply 22 1st Decade Decadic Counter 14 15

Attenuator Comparator A 5 6 7 8

Buffer Converter Attenuator Comparator B 5 6 7 8 3 Processor 16 Control Logic

Buffer Converter Amplifier Converter C 9 10 11 12

Divider ECL Divider TTL

Interfaces 17 18 Keyboard GPIB RS 232C 19 LC Display 20 EPROM 21 RAM

3.2 Description
The internal measuring operation of the unit is controlled by a one-chip microprocessor MCS-51 (16) with the help of additional circuits. The time base (1), which is supplied with the frequency standard of 10 MHz (1), provides precise frequencies for the measuring intervals. This nominal frequency is led to the switch and control logic circuit (3) via the shaper (2). The structure of channels A and B is identical. First the measuring signal is adapted by attenuator (5) and voltage amplifier (6). The output signal of the voltage amplifier is led to the comparator (7). The input signal is converted into a logic signal at ECL level in response to the setting of the trigger level. This signal is converted from ECL to TTL level in the converter (8), and is led to the input of the switch and control logic (3). The measuring signal passing through channel C is also adapted (9), and led to a fast ECL divider (10) and converted from ECL to TTL (11). Before passing the switch and control logic the high-frequency signal is divided once more (12). The input signals are divided in a high-speed predivider 1:10 (14) in response to the condition of the programmable divider (4) and the start/stop circuit (13) which generates measuring intervals. Then the signal is evaluated by a decadic counter (15). The processor (16) organizes the reading of the keyboard (20), the setting of the control logic (3), the resetting of the counting decades (14, 15), the visualization on an alphanumeric LC display (19) and the repetition of the measurement. The processor loads and saves the system parameters with the help of EPROM (20) and RAM (21). The unit can also communicate with superior systems via parallel interface GPIB and the serial interface RS-232C (17).

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Operating Instructions UZ 2500 1/2000

4 Technical Data
4.1 General Data
Nominal temperature: Operating temperature: Relative humidity: Atmospheric pressure: Operating position: Operating voltage: + 23 C 2 C + 5 to + 40 C 20 to 80 % 86 to 106 kPa horizontal or inclined by 15 sinusoidal alternating voltage (distortion factor < 5 %) 115/230 V (+ 10 %/- 15 %), internally switchable, 47 to 63 Hz ( 5 %) 40 VA (max. 30 W) T 200 L/250 V (230 V~) T 400 L/250 V (115 V~) 1, according to DIN EN 61010 Part 1 EN 55011 Class B 290 mm 120 mm 260 mm 335 mm 125 mm 385 mm about 3.8 kg about 6.0 kg

Power consumption: Fuses: Safety class: Radio interference suppression: Dimensions (L H D): Dimensions of packing: Weight of universal counter: Weight incl. packing and accessories:

4.2 Specifications
4.2.1 Characteristics of Channel A Frequency range: Basic sensitivity: (Voltage divider 1:1): Coupling: Input impedance: Input divider: Dynamic range: 10 Hz to 100 MHz Vrms = 25 mV (sine signal) Vpp = 75 mV on pulses with minimal width of 10 ns a.c. voltage 1 M (< 40 pF) 1:1 or 10:1 75 mV Vpp 5 V

(with divider 10:1): Maximum input voltage: Trigger edge: Trigger level setting: (voltage divider 1:1) (voltage divider 10:1)

750 mV Vpp 50 V 50 V (V= + Vpp ) 8 V ( Vrms ) with divider 1:1, f > 100 kHz rising or falling adjustable by potentiometer 1.5 to + 1.5 V 15 to + 15 V

Operating Instructions UZ 2500 1/2000

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4.2.2 Characteristics of Channel C

Frequency range: Dividing ratio: Sensitivity 50 MHz f 100 MHz 100 MHz f 2 GHz 2 GHz f 2.4 GHz Input impedance: Standing wave ratio: Coupling: Maximum input voltage: Optimum input voltage:

50 MHz to 2,400 MHz 100:1 Vrms = 50 mV Vrms = 25 mV Vrms = 50 mV 50 2.5 a.c. voltage Vrms = 2.5 V -sine signal 40 V d.c. indicated by extinguishing of LEDs MIN and MAX

4.3 Functions
4.3.1 Diagnostic Unit Function (CHECK)

Measuring range: Measuring times (Gate Time): Accuracy: Result display:

10 Mhz (standard frequency) tGate = 10 s, 100 s, 1 ms, 10 ms, 100 ms, 1 s, 10 s 1 LSD1) MHz with decimal point

4.3.2 Frequency Measurement on Channel A or B (FREQ A, FREQ B)

Measuring range: Measuring times (Gate Time): Frequency resolution: Accuracy: Result display:

10 Hz to 100 MHz tGate = 10 s, 100 s, 1 ms, 10 ms, 100 ms, 1 s, 10 s f = 1/tGate (max. 9 digits) 1 LSD1) time base error Hz, kHz, MHz with decimal point

4.3.3 Frequency Measurement on Channel C (FREQ C)

Measuring range: Measuring times (Gate Time): Frequency resolution: Accuracy: Result display:

50 MHz to 2.4 GHz tGate = 10 s, 100 s, 1 ms, 10 ms, 100 ms, 1 s, 10 s f = 100/tGate (max. 9 digits) 1 LSD1) time base error MHz, GHz with decimal point

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Operating Instructions UZ 2500 1/2000

4.3.4 Frequency Ratio Measurement on Channels A and B (RAT A/B)

Inputs: Measuring range: Measuring time n: Frequency resolution: Accuracy: Result display:

channels A and B ( Vrms 100 mV for channel B) 10-7 to 107 102- to 108-multiple of period length for input signals at channel B f = 1/n 1 LSD1) trigger error2) of channel B without measuring unit, with decimal point

4.3.5 Frequency Ratio Measurement on Channels C and B (RAT C/B)

Inputs: Measuring range: Measuring time n: Frequency resolution: Accuracy: Result display:

channels C and B ( Vrms 100 mV for channel B) 0.5 to 2.4 108 102- to 108-multiple of period length for input signals at channel B f = 100/n 1 LSD1) trigger error2) of channel B without measuring unit, with decimal point

4.3.6 Period Length Measurement on Channel A or B (PER A, PER B)

Measuring range: Sensitivity: Measuring unit (resolution): Accuracy: Result display:

1 s to 100 ms Vrms = 100 mV 100 ns 1 LSD1) trigger error2) time base error s, ms with decimal point

4.3.7 Time Interval Measurement on Channel A or B (TIME AB)

Measuring range: Slew rate: Measuring unit (resolution): Accuracy: Result display:

1 s to 100 s > 6 V/s 100 ns 1 LSD1) trigger error2) time base error s, ms, s with decimal point

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4.3.8 Pulse Counting on Channel A or B (TOT A, TOT B)

Measuring range: Sensitivity: Slew rate: Accuracy for external control Counter error: Measuring interval error: Result display:

1 to 109 events Vrms = 100 mV > 6 V/s

1 LSD1) trigger error2) without measuring unit and decimal point

Note:

The setting of the gate time does not influence the functions period length measurement and simple pulse counting. The repetition speed is about 250 ms on automatic operation.
1) 2)

LSD: Last significant digit of displayed value; corresponds to the resolution within the respective measuring range. The trigger error Vnoisemax Vnoisemax a, is for pulse signals T = + S START S STOP
Vnoisemax (V) SSTART (V/s) SSTOP (V/s)

- peak value of the noise voltage in the signal - slew rate of start edge - slew rate of stop edge

b, is 0.3 % for sine wave signals at a given signal/noise ratio of 40 dB.

4.4 Time Base
Start-up time: Nominal frequency of quartz oscillator: Accuracy of frequency setting: Frequency deviations after 24 hours: Temperature influence: 15 min 10 MHz 5 10-9 (at final setting of the unit) 10-8 < 5 10-9/C

4.5 Display
The unit is equipped with two 16-digit alphanumeric LC display lines with back lighting. The first line shows the measuring result, measuring unit and decimal point. In the second line the current measuring function and parameter such as measuring interval length, multiplication exponent and so on are displayed. During parameter input the name of the function group is indicated in the first line and the name of the function buttons from F1 to F4 is indicated in the second line.

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4.6 System Interface
The counter can be fully controlled and can be read out via the parallel interface GPIB and the serial interface RS-232C apart from the setting of the trigger levels.
4.6.1 Interface GPIB

Standards of the interface: Functions of the interface: Length of input buffer: General instructions and queries:

ANSI/IEEE 488.1 1987, IEEE 488.2 1992 SH1, AH1, SR1, T5, L4, RL1, PP0, DC1, DT1, E2 64 characters
*CLS, *ESE, *ESE?, *ESR?, *SRE, *SRE?, *STB?, *IDN?, *RST, *TST?, *TRG, *OPC, *OPC?, *WAI

4.6.2 Interface RS-232C

Data transmission rate: Length of data word: Number of STOP bits: Parity: Protocol: End characters: Length of input buffer: Reservation of plug connections:

1,200 to 9,600 Bd 8 bit 1 none RTS/CTS, without CR + LF (13 dec. + 10 dec.) 64 characters

UZ 2500 FG TXD

PC

1 2 3 4 5 6 7 8 20

1 2 3 4 5 6 7 8 20

FG TXD RXD RTS CTS DSR SG DCD DTR

RXD RTS CTS DSR SG DCD DTR

Operating Instructions UZ 2500 1/2000

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5 Control Elements

3

12

13

14

18

19

2 1 22 4 23

10 5 6 7 8 9 11

15 17

16 21

20 24

[1] [2]

Power switch Control indication ON/OFF The button indicates whether the unit is ready for operation. LC display see 4.5 UP button The button is used to scroll up the current menu. DOWN button The button is used to scroll down the current menu. F1 button The button sets the measuring functions. F2 button The button sets the parameter of measuring functions. F3 button The button sets the parameters for the input amplifier of channels A and B.

[3]

[4]

[5]

[6]

[7]

[8]

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Operating Instructions UZ 2500 1/2000

[9]

F4 button The button sets the measuring mode, chooses and sets the parameters of the interfaces and starts the special functions. ESC/LOCAL button The button is used to leave the menu and the unit switches from remote control to local control. ENTER button On pressing this button the function menu is left and the respective measurement is started. GATE display The LED indicates the length of the measuring interval (Gate Time). REMOTE display The LED lights up if the unit is controlled via remote control. Potentiometer TRIG (A) The potentiometer is used for setting the trigger level at channel A. RISE/FALL display (A) The LED lights up if the trigger edge of channel A falls. 1:1/10:1 display (A) The LED lights up if the input voltage divider was set to the ratio 10:1 at channel A. BNC input socket (A) see 4.2.1 Potentiometer TRIG (B) The potentiometer is used for setting the trigger level of channel B. RISE/FALL display (B) The LED lights up if the trigger edge of channel B falls. 1:1/10:1 display (B) The LED lights up if the input voltage divider was set to the ratio 10:1 at channel B. BNC input socket (B) see 4.2.1 MAX display The LED indicates an input voltage too high for channel C. MIN display (C) The LED indicates an input voltage too low for channel C. BNC input socket (C) see 4.2.2

[10]

[11]

[12]

[13]

[14]

[15]

[16]

[17]

[18]

[19]

[20]

[21]

[22]

[23]

[24]

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Power is supplied by a fused plug for non-heating appliances. The unit is provided with a fuse of T 200 L/250 V for 230 V~ or T 400 L/250 V for 115 V~ net voltage respectively. The operating voltage indication shows which operating voltage is to be used. The interfaces GPIB und RS-232C serve the purpose of data transmission on remote via external devices. The mains plug with fuse, the operating voltage indication, the interfaces and the type plate of the unit can be found at the back of the counter.

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6 Performance of Measurements
6.1 Starting
For external control of the unit the corresponding connecting cable of the system interface GPIB or RS-232C has to be connected before switching on the operating voltage. After pushing the button Power switch [1] the LED ON/OFF [2] lights up and the message appears on the display: COUNTER PowerUp SelfTest Internal unit tests are started after switching on. The efficienty proof of the system, of the processor, of the bus, of the RAM-memory, of the display, of the keyboard and the battery or the software of the EPROM memory are tested. If everthing is in order, the message is displayed: COUNTER READY Otherwise the unit displays an error message with a corresponding notice of the reason, e.g.:
Testing: EPROM ERROR

and the unit interrupts the test until the defect is eliminated. When the test is successfully completed the frequency measurement is carried out on channel A and if no input signal is connected the message appears on the display:
. MHz [1 s]

FREQ A

The measuring time is set to 10 s and the input voltage divider of the channels A and B is set to 1:1. Other settings: Repeat mode, rising edge trigger, potentiometer A and B on. Now the unit is basically ready to start measurements, but the specified parameters for the time base are only fully set 15 minutes after switching the unit on.
6.1.1 Selection of Measuring Mode

The unit can perform single measurements (Single) and repeat measurements (Repeat). After switching of the F4 button [9] the main menu is called and the message appears on the display [3]: -- MAIN MENU -RMD INT SETI AUX

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On pressing the F1 button [6] the menu point RMD (Run MoDe) is selected and the following message is displayed: RUN MODE: REGIME The variable REGIME has both values Single (single measurement) and Repeat (repeat measurement). On pressing the UP button [4] or DOWN button [5] the desired mode is activated. With the help of the ENTER button [11] the new setting is saved. If the ESC button [10] is pushed the old setting is kept. In both cases the unit reverts to the main menu. After repeated actuating of the ENTER button [11] the measurement is started. In the case of the single measurement (SINGLE) the unit carries out one measurement, displays the measuring value and is stopped. Any repeated pressing of the ENTER button [11] starts a new measurement. At repeat measurement (REPEAT) the measurement is started automatically. The interval between the single measurement is fixed at about 250 ms. The measuring time (Gate Time) is indicated by the LED GATE [12].
6.1.2 Adjustments of Input Channels

The trigger level of the input amplifier at channels A and B can be set by turning the potentiometers [14] or [18] to the left for negative values (on triggering to falling edge) or to the right for positive values (on triggering to rising edge) (see 4.2.1). For periodic signals with sampling ratio 1:1 the potentiometer should be adjusted to the position SET. The trigger level corresponds to the value 0 V (zero passage). The signal attenuations and trigger edges at the inputs of channels A and B are set with the function buttons from F1 to F4. After pushing the F3 button [8] the message appears on the display [3]: IN-A IN-B 1:1 1:1 and the function buttons receive the meanings:
F1 [6] F2 [7] F3 [8] F4 [9]

- change of the dividing ratio at channel A, - change of the trigger edge at channel A, - change of the dividing ratio at channel B, - change of the trigger edge at channel B.

By pressing the appropiate button the desired change is made. With the help of the ENTER button [11] the new settings are saved in the memory of the processor and the unit switches to the measuring state. If the ESC button [10] is pushed the old settings are kept. In both cases the menu operation is finished and the measuring is started. No settings have to be made for measurements on channel C. The input level can be observed with the help of the LEDs MIN [23] and MAX [22].

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6.2 Frequency Measurement on Channel A or B (FREQ A, FREQ B)
Channels A and B allow frequency measurements of periodic signals within the range of 10 Hz to 100 MHz. The parameters of the input channels are set as described in paragraph 6.1.2. The input signal is led to the selected channel. With the help of the F1 function [6] the menu point FUNC is called to set the measuring function and the following message appears on the display [3]:
Function: Description

The variable Description describes the respective measuring function. On pressing the UP button [4] or DOWN button [5] the desired measuring function FREQ A or FREQ B is set. With the help of the F2 button [7] the menu point MODE for setting the measuring intervals is activated and the following message appears on the display [3]:
Gate Time: Value

The variable Value corresponds to the measuring intervals 1 s, 1 s, 1 ms, 1 ms, 1 ms, 1 s and 1 s. On pressing the UP button [4] or DOWN button [5] the desired measuring interval is set. With the help of the ENTER button [11] the new settings are saved in the memory of the processor. If the ESC button [10] button is pushed the old settings are kept. In both cases the menu operation is finished and the measuring is started.

6.3 Frequency Measurement on Channel C (FREQ C)
Channel C allows frequency measurements of periodic signals within the range of 50 MHz to 2.4 GHz.. The input signal is led to channel C. With the help of the F1 button [6] the menu point FUNC is called to set the measuring function and the following message appears on the display [3]:
Function: Description

The variable Description describes the respective measuring function. On pressing the UP button [4] or DOWN button [5] the measuring function FREQ C is set. The measuring intervals are set as described in paragraph 6.2. With the help of the ENTER button [11] the new settings are saved in the memory of the processor. If the ESC button [10] is pushed the old settings are kept. In both cases the menu operation is finished and the measuring is started. The input level can be observed with the help of the LED MIN [23] and MAX [22]. The maximum value is Vrms = 2.5 V and should not be exceeded.

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6.4 Frequency Ratio Measurement on Channels A and B (RAT A/B)
The result of the measurement is the number of signal periods at channel A in relation to the cycle duration of the signal at channel B. The measuring interval is defined by the decading multiple of the cycle duration of the signal at channel B with the factors from 102 to 108. With the help of the F1 button [6] the menu point FUNC is called to set the measuring function and the following message appears on the display [3]:
Function: Description

The variable Description describes the respective measuring function. On pressing the UP button [4] or DOWN button [5] the measuring function RAT A/B is set. With the help of the F2 button [7] the menu point MODE for setting the multiple factor is activated and the following message appears on the display [3]:
Multiples: Value

The variable Value describes the exponent 2, 3, ... 8 of the basis factor 10. On pressing the UP button [4] or DOWN button [5] the desired exponent is set. The bigger the exponent is the greater the accuracy (resolution) of the frequency ratio and the longer the measuring time. The parameters of the input channels are set as described in paragraph 6.1.2. With the help of the ENTER button [11] the new settings are saved in the memory of the processor. If the ESC button [10] is pushed the old settings are kept. In both cases the menu operation is finished and the measuring is started. The measurement is started when a signal is fed to channel B.

6.5 Frequency Ratio Measurement on Channels C and B (RAT C/B)
The result of the measurement is the number of the signal periods at channel C in relation to the cycle duration of the signal at channel B. The measuring interval is defined by the decading multiple of the cycle duration of the signal at channel B with the factors from 102 to 108. With the help of the F1 button [6] the menu point FUNC is called to set the measuring function and the following message appears on the display [3]:
Function: Description

The variable Description describes the respective measuring function. On pressing the UP button [4] or DOWN button [5] the measuring function RAT C/B is set. With the help of the F2 button [7] the menu point MODE for setting the multiple factor is activated and the following message appears on the display [3]:
Multiples: Value
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The variable Value describes the exponent 2, 3, ... 8 of the basis factor 10. On pressing the UP button [4] or DOWN button [5] the desired exponent is set. The bigger the exponent is the greater the accuracy (resolution) of the frequency ratio and the longer the measuring time. The parameters of the input channels are set as described in paragraph 6.1.2. With the help of the ENTER button [11] the new settings are saved in the memory of the processor. If the ESC button [10] is pushed the old settings are kept. In both cases the menu operation is finished and the measuring is started. The measurement is started when a signal is fed to channel B.

6.6 Period Length Measurement on Channel A or B (PER A, PER B)
With the help of the F1 button [6] the menu point FUNC is called to set the measuring function and the following message appears on the display [3]:
Function: Description

The variable Description describes the respective measuring function. On pressing the UP button [4] or DOWN button [5] the measuring function PER A or PER B is set. The parameters of the input channels are set as described in paragraph 6.1.2. With the help of the ENTER button [11] the new settings are saved in the memory of the processor. If the ESC button [10] is pushed the old settings are kept. In both cases the menu operation is finished and the measuring is started.

6.7 Time Interval Measurement on Channels A and B (TIME AB)
The result of the two-channel measurement is the time between the beginning of the interval determined by the signal at channel A and the end of the interval determined by the signal at channel B. At this measurement the combination of the trigger edges of the signals at both channels can be used to set the required measuring interval. The setting of the trigger edges is described in paragraph 6.1.2. With the help of the F1 button [6] the menu point FUNC is called to set the measuring function and the following message appears on the display [3]:
Function: Description

The variable Description describes the respective measuring function. On pressing the UP button [4] or DOWN button [5] the measuring function TIME AB is set. The parameters of the input channels are set as described in paragraph 6.1.2. With the help of the ENTER button [11] the new settings are saved in the memory of the processor. If the ESC button [10] is pushed the old settings are kept. In both cases the menu operation is finished and the measuring is started. The measurement is started when a signal is fed to channel A.

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6.7.1 Pulse Width Measurement

An application example of the time interval measuring is the pulse width definition of the input signal. The sequence of events during the measuring procedure is described in the prevous paragraph 6.7. The decisive feature is the choice of the trigger edges. For positive values a rising trigger edge has to be set at channel A and a falling edge at channel B. For negative values the opposite applies. For this measurement the channels A and B have to be connected.

6.8 Pulse Counting on Channel A or B (TOT A, TOT B)
The result of the measurements is the number of the pulses at channel A or B during a measuring interval. The interval can be generated in different ways: 1. The user starts the measurements at the keyboard of the unit: MANual triggering 2. The measurement interval is controlled by the signal at channel A or B: EXTernal triggering
6.8.1 Manual Triggering

The parameters of the input channels are set as described in paragraph 6.1.2. The input signal is fed to channel A or B. With the help of the F1 button [6] the menu point FUNC is called to set the measuring function and the following message appears on the display [3]:
Function: Description

The variable Description describes the respective measuring function. On pressing the UP button [4] or DOWN button [5] the desired measuring function TOT A oder TOT B is set. With the help of the F2 button [7] the menu point MODE for setting the control mode is activated and the following message appears on the display [3]:
Mode: Regime

The variable Regime has both values MAN (manual triggering) and EXT (external triggering). On pressing the UP button [4] or DOWN button [5] the manual triggering MAN is set. With the help of the ENTER button [11] the new settings are saved in the memory of the processor. If the ESC button [10] is pushed the old settings are kept. In both cases the menu operation is finished and the measuring is started.

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At continuous measurements (Repeat) the counting decades are reset on pressing the ESC button [10]. When the function Single (single measurements) is set and the unit runs, the counting decades are reset on pressing the ENTER button [11]. Now the ESC button [10] is insignificant.
6.8.2 External Triggering

The parameters of the input channels are set as described in paragraph 6.1.2. The input signals are fed to channels A and B. With the help of the F1 button [6] the menu point FUNC is called to set the measuring function and the following message appears on the display [3]:
Function: Description

The variable Description describes the respective measuring function. On pressing the UP button [4] or DOWN button [5] the desired measuring function TOT A oder TOT B is set. With the help of the F2 button [7] the menu point MODE for setting the control mode is activated and the following message appears on the display [3]:
Mode: Regime

The variable Regime has both values MAN (manual triggering) and EXT (external triggering). On pressing the UP button [4] or DOWN button [5] the external triggering EXT is set. With the help of the ENTER button [11] the new settings are saved in the memory of the processor and the unit switches to the measuring state. If the ESC button [10] is pushed the old settings are kept. The unit is ready and waits on a start/stop pulse. At the function ,,TOT A" the measuring signal is fed to the input of the channel A and the start/stop pulse fed to the at input of the channel B. With measurements of the function ,,TOT B" the functions of the channels are exchanged. At continuous measurements (Repeat) the counting decades are reset on pressing the ESC button [10]. When the function single measurements (Single) is set and the unit run, the counting decades are reset on pressing the ENTER button [11]. Now the ESC button [10] is insignificant.

6.9 Error Message
The measuring decades can be overflown in some cases due to unfavourable selection of the measuring range (Gate Time). In this case the faulty result is not displayed but the error message is displayed. ERROR: OVERFLOW !

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6.10 Special Unit Functions
After pressing the F4 button [9] twice the sub-menu is called to set the specific unit functions and the following message appears on the display [3]:
--- AUX MENU --MEM LOAD TGS TST

The current parameters are saved with the help of the F1 button (MEM) [6]. This process is displayed with the following message:
Memory: ..........SAVING

After pressing the ENTER button [11] or ESC button [10] twice the unit switches to the measuring state. After switching on the saved unit configuration is loaded and the parameters are set. The basic configuration (FREQ A) is loaded with the help of the F2 button (LOAD) [7]. Thereby the user-defined settings are deleted. After pressing the ENTER button [11] or ESC button [10] twice the unit switches to the measuring state. The trigger levels of the channels A and B are set after pressing the F3 button (TGS) [8] and the following message appears on the display [3]:
Trigger: Parameter

The variable Parameter describes the procedure for setting the trigger levels. On pressing the UP button [4] or DOWN button [5] the following settings can be selected.
P_A & P_B P_A & S_B S_A & P_B S_A & S_B

- The trigger levels of channels A and B are set by potentiometers [14] and [18]. - The trigger level of channel A is set by potentiometer [14] and the trigger level of channel B is set by SET mode. - The trigger level of channel A is set by SET mode and the trigger level of channel B is set by potentiometer [18]. - The trigger levels of channels A and B are set by SET mode.

Note:

In the SET mode the trigger level corresponds to the value 0 V (can be set by turning the potentiometers [14, 18] to the left stop).

With the help of the ENTER button [11] the new settings are saved in the memory of the processor. If the ESC button [10] is pushed the old settings are retained. In both cases the menu operation is finished and the measuring is started. After pressing the ENTER button [11] or ESC button [10] twice the unit switches to the measuring state. The self-test is called (see 6.1) after pressing the F4 button (TST) [9]. The test results are displayed by a message with the corresponding message. After pressing the ENTER button [11] or ESC button [10] twice the unit switches to the measuring state.

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7 Remote Control by Program
Remote control of the counter by a personal computer is possible via the interfaces GPIB and RS-232C. The connecting cable must not be longer than 15 m and should be connected when the unit is off. After switching on the counter is in starting position and can receive commands. The remote control is displayed on LED REMOTE [13]. All parameter settings, measuring functions and measuring value outputs without trigger level settings of channel A and B can be realized via remote control.

7.1 Preparation on the Counter
7.1.1 Interface GPIB (IEEE 488.2) 7.1.1.1 Communication with Control Unit (Personal Computer)

The connecting cable between counter and computer must correspond to standard IEEE 488.1. The interface GPIB of the counter is set at the system address 7. After switching on the unit and when the internal test is successfully completed the operating parameters can be set with the help of a menu. After pressing the F4 button [9] the main menu is called and the following message appears on the display [3]: -- MAIN MENU -RMD INT SETI AUX On pressing the F2 button [7] the menu point INT (Interface) is selected and the following message is displayed: Interface: Parameter The variable Parameter means both interface GPIB or RS-232C. On pressing the UP button [4] or DOWN button [5] the interface GPIB is set. With the help of the ENTER button [11] the new setting is saved. On pressing the F3 button [8] the menu point SETI (Set Interface) is selected and the following message is displayed: --- GPIB SET --ADDRESS TON With the help of the F1 button [6] or F2 button [7] the current system address is called on the display [3]: Address: Value The variable Value describes the system address. On pressing the UP button [4] or DOWN button [5] the address can be set from to 3. After pressing the ENTER button [11] twice the menu operation is finished. After switching off the settings are saved.

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7.1.1.2 Communication without Control Unit (Printer)

In the operating mode TON (Talk Only) output units (e.g. printer) which work in the operating mode LON (Listen Only) can be connected the counter. This enables the measuring to be recorded. After pressing the F4 button [9] the main menu is called and the following message appears on the display [3]: -- MAIN MENU -RMD INT SETI AUX On pressing the F2 button [7] the menu point INT (Interface) is selected and the following message is displayed: Interface: Parameter The variable Parameter means both interface GPIB or RS 232. On pressing the UP button [4] or DOWN button [5] the interface GPIB is set. With the help of the ENTER button [11] the new setting is saved. On pressing the F3 button [8] the menu point SETI (Set Interface) is selected and the following message is displayed: --- GPIB SET --ADDRESS TON With the help of the F3 button [8] or F4 button [9] the choice of the operating mode TON is called on the display [3]: Talk ONly: Stand The variable Stand describes the state ON or Off. On pressing the UP button [4] or DOWN button [5] the operating mode TON can be set ON. After pressing the ENTER button [11] twice the menu operation is finished. After switching off the settings are saved.
7.1.2 Interface RS-232C

The interface RS-232C of the personal computer has to have the configuration as described in paragraph 4.6.2. After switching on of the unit and when the internal test is successfully completed the operating parameters can be set with the help of a menu. After pressing the F4 button [9] the main menu is called and the message appears on the display [3]: -- MAIN MENU -RMD INT SETI AUX On pressing the F2 button [7] the menu point INT (Interface) is selected and the following message is displayed: Interface: Parameter

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The variable Parameter means both interface GPIB or RS 232. On pressing the UP button [4] or DOWN button [5] the interface RS 232 is set. With the help of the ENTER button [11] the new setting is saved. On pressing the F3 button [8] the menu point SETI (Set Interface) is selected and the following message is displayed: -- RS 232 SET -BD-RATE PROTOCOL With the help of the F1 button [6] or F2 button [7] the current baud rate is called on the display [3]: Baud Rate: Value The variable Value describes the current baud rate. On pressing the UP button [4] or DOWN button [5] the baud rate can be set from 12 Bd to 96 Bd. With the help of the ENTER button [11] the new setting is saved. With the help of the F3 button [8] or F4 button [9] the current communication protocol is called on the display [3]: Protocol: Typ The variable Typ describes the current choice NONE or RTS/CTS. On pressing the UP button [4] or DOWN button [5] the data exchange can be set with or without protocol. After pressing the ENTER button [11] twice the menu operation is finished. After switching off the settings are saved.

7.2 Transition: Remote Control Local Control
On transmission of the command REN from the personal computer the counter is in the state of REMOTE CONTROL which is indicated by the LED REMOTE [13]. Afterwards control of the unit by the local control elements is not possible (except LOCAL button [10]). There are several ways of switching from remote control to local control of the unit: - by transmission of the command GTL (Go To Local) from the personal computer, - by pressing the LOCAL button [10] at the counter if the unit keyboard has not been locked by the command LLO (Local Lock Out), - by switching off and on the power switch [1]. The following enquires and instructions can also be sent and received from the personal computer by local control of the unit:

*IDN?,*CLS,*ESR?,*ESE,*ESE?,*STB?,*SRE,*SRE?,ERR?,ATTA?, ATTB?,SLOPA?,SLOPB?,LEVA?,LEVB?,GATE?,NPER?,TOM?.

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7.3 Messages of the Counter on Remote Control
7.3.1 Description of the Unit State

The current unit state of the operating conditions can be indicated via the EVENT STATUS REGISTER and the STATUS BYTE REGISTER at any time.
7.3.1.1 ESR - EVENT STATUS REGISTER

The contents of the ESR register are saved in the output buffer and deleted (except bit 7) by transmission of the command *ESR? from the personal computer. The ESE register can be also set on by switching on the unit, by transmission of the command *CLS or after activation of the interface GPIB.
Contents of the ESR register: ESR xxx

Bit 7: (PON) Power On, operating readiness and capitalization of the interfaces are displayed at 1. 6: (URQ) User Request, isn't used, is always set on . 5: (CME) Command Error, is set on 1 at instruction errors. 4: (EXE) Execution Error, is set on 1 at question errors and execution errors. 3: (DDE) Device Dependent Error, unit errors are displayed at 1. 2: (QYE) Query Error, is set on 1 at question errors. 1: (RQC) Request Control, isn't used, is always set on . : (OPC) Operation Complete, is set on 1 by transmission of the command *OPC. Various states and settings of the unit can be checked. For this the contents of the ESR register are called with the help of the mask (ESE - EVENT STATUS ENABLE REGISTER). The single bits are compared and evaluated by the following logical equation: ESB = (ESR7 ESE7) (ESR6 ESE6) (ESR5 ESE5) (ESR4 ESE4) (ESR3 ESE3) (ESR2 ESE2) (ESR1 ESE1) (ESR ESE) The result ESB (Event Summary Bit) is saved in the STB register. The command *ESE xxx offers the possibility of initializing the ESE register with any masks. The value xxx has to be within the range of to 255. The current contents ESE xxx can be queried by transmission of the command *ESE?. The contents of the register can set to by switching on the unit or after activation of the interace GPIB.
7.3.1.2 STB - STATUS BYTE REGISTER

The contents of the STB register are saved in the output buffer by transmission of the command *STB? from the personal computer. The STB register can be set on by switching on the unit, by transmission of the command *CLS or after activation of the interface GPIB.

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Contents of the STB register:

STB xxx

Bit 7: isn't used, is always set on . 6: (MSS) Master Summary Bit, result by checkup of the STB register with a mask. (RQS) Request service, for GPIB interface only, is derived from the condition of the MSS bit according to IEEE 488.2 and is read as part of the STB register by transmission of the command *STB? in serial operating mode according to IEEE 488.1. 5: (ESB) Event Summary Bit, result by checkup of the ESR register with a mask (ESE register). 4: (MAV) Message Available, is set on 1 if a current massage of the unit is requested at the output buffer. 3: isn't used, is always set on . 2: isn't used, is always set on . 1: isn't used, is always set on . : isn't used, is always set on . Note: When the interface GPIB is used in serial operating mode according to IEEE 488.1 the RQS bit is readable as the part of the STB register for the personal computer. This option does not exist when using interface RS-232C.

Various states and settings of the unit can be checked. For this the contents of the ESR register are called with the help of the mask (SRE - SERVICE REQUEST ENABLE REGISTER). The single bits (except SRE bit 6, it is set on always) are compared and evaluated by the following logical equation: MSS = (STB7 SRE7) (STB5 SRE5) (STB4 SRE4) (STB3 SRE3) (STB2 SRE2) (STB1 SRE1) (STB SRE) The result MSS (Master Summary Status) is saved in the STB register. The command *SRE xxx offers the possibility of initializing the ESE register with any masks. The value xxx has to be within the range of to 255. The current contents xxx can be queried by transmission of the command *SRE?. The contents of the register can be set on by switching on the unit, by transmission of the command *CLS or after activation of the interface GPIB.
7.3.2 Description of the Unit Messages DIGIMESS,UZ25,x,y

- identification of the unit and of the software version with x - production number or y - software version or

ATTA_1; ATTB_1;

ATTA_1 ATTB_1

- set ratio 1:1(10) of the input divider at channel A - set ratio 1:1(10) of the input divider at channel B

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SLOPA_RISE; SLOPA_FALL SLOPB_RISE; SLOPB_FALL LEVA_SET;LEVA_POT LEVB_SET;LEVB_POT GATE_1US GATE_1US GATE_1MS GATE_1MS GATE_1MS GATE_1S GATE_1S NPER_1Ex

- set trigger edge at channel A - set trigger edge at channel B - current choice of trigger level at channel A - current choice of trigger level at channel B - gate times: t = 10 100 1 10 100 1 10 s s ms ms ms s s

- exponent x = 2, 3, 4, 5, 6, 7 and 8 for the decadic multiple of the period length - external triggering by pulse counting - manual triggering by pulse counting

TOM_EXT TOM_MAN

7.3.3 Description of the Results

The measuring results are sent in the following format: a) from b) from with:
ZZ XXX.XXXX E V Y


ZZ X ZZ XEVY

to to

ZZ XXX ZZ XXX.XXXXEVY

Hz, s, without meaning mantisse symbol for exponent sign (+/-) exponent

7.3.4 Description of the Errors

When errors occur in the remote-controlled settings and measurements, they are saved with a code in the error register. The contents (error message) of the error register are called and deleted by transmission of the command ERR? from the personal computer. If several errors arise only the first two error codes are saved. On repeating transmission of the command ERR? the contents of the errror codes can be called and initialized (deleted). The initializing of the error register is also started by transmission of the command *CLS (initializing of the state register). In the case of error the transmission and receiving of commands or data is still possible.

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7.3.4.1 List of Error Messages

error code


text of messages
DEVICE DEPENDENT ERROR QUERY ERROR OVERFLOW INTERFACE ERROR UNDERMINATED INTERRUPTED DEADLOCKED BAD USING QUERY EXECUTION ERROR NO EXECUTION NOT EX. IN LOCAL NO VALID DATA VAL. OUT OF RANGE TRIGGER IGNORED COMMAND ERROR ILLEGAL COMMAND GPIB error NO LISTENER RS 232 error INP. BUFFER FULL

meaning of text - faultless operation unit error query error - counting decades are overflown interface error - interface isn't programmed, read operation - interface is programmed, no read operation - interface is programmed, locked - query is wrong execution error - cannot be executed - cannot be executed in local control - data are invalid - values are out of range - triggering cannot be executed command error - illegal command error of the GPIB interface - no output unit is connected error of the RS-232C interface - input buffer is full

1 111 114 117 12 131 132 133 134 135 151 171 181

The error messages are dependent on the state of operation and the type of the error. At local control interface errors are displayed for only a short time. At remote control interface errors are displayed by the message INTERFACE ERROR. The error message is deleted when the contents of the error register is queried or initialized or a unit error occurred. Unit errors are displayed by the message DEVICE DEPENDENT ERROR. The error message is deleted when new commands from the personal computer or new measuring data from the unit are transmitted.

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7.4 List of Commands on Remote Control
7.4.1 General Commands REN (Remote)

- transition from local control to remote control GPIB: - address instruction according to IEEE 488.1 RS-232C: - ASCII: HT = 9 (dec.)

LLO (Locked Local Out) - locking of the LOCAL button GPIB: - address instruction according to IEEE 488.1 RS-232C: - ASCII: EM = 25 (dec.) GTL (Go To Local)

- transition from remote control to local control GPIB: - address instruction according to IEEE 488.1 RS-232C: - ASCII: SOH = 1 (dec.) - initializing of corresponding interface GPIB: - address instruction according to IEEE 488.1 RS-232C: - ASCII: DC4 = 20 (dec.)

DCL (Device clear)

GET (Group Execute Trigger) - interface instruction for start of measurements and saving of results in the output buffer GPIB: - address instruction according to IEEE 488.1 RS-232C: - ASCII: BS = 8 (dec.)

Note:

This instruction must not be between the first command and the end character of a command line.

*RST (Reset)

- initializing of unit settings input divider: - attenuating 1:1 on channels A and B trigger edge: - rising edge on channels A and B trigger level: - use of potentiometers on channels A and B is possible measuring function: - frequency measurement on channel A Gate Time: - 10 s After switching on the commands *RST and *CLS are executed automatically and the contents of the ESR, STB, ESE and SRE register are reset. - start of unit tests and saving of results meaning: - test is successful 1 - test isn't successful

Note:

*TST? (Test)

*IDN? (Identification) - identification of the unit and of the software version

Note:

The command *IDN? should be written at the end of the command line so that the result is saved in the output buffer.

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*CLS (Clear Status Byte) ERR? (Error) *WAI (Waiting) *OPC (Operation Complete) *OPC? MEAS (Measurement) MEAS? *TRG (Triggerung) CONT (Continous)

- initializing (resetting) of ESR- and STB registers - reading (output buffer) and resetting of the error register - The following commands are executed after completion of current operation. - After completion of current operation the bit 7 (OPC) in the ESR register is set on 1. - After completion of current operation the number 1 is saved in the output buffer. - starting of the measurement after settings of a measuring function and saving of the result in the output buffer - starting of the measurement after settings of a measuring function and transmission of the result - general instruction for the starting of the and saving of the result in the output buffer - starting of the continuous measurement The current measuring value is always saved in the output buffer. Every instruction interrupts the measurement. - reading of the output buffer and transmission of the result

READ? (Reading)

7.4.2 Commands for Setting the Measuring Parameters ATTA_1 ATTA_1 ATTB_1 ATTB_1 SLOPA_RISE SLOPA_FALL SLOPB_RISE SLOPB_FALL LEVA_SET LEVA_POT LEVB_SET LEVB_POT

- ratio 1:1 of the input divider at channel A - ratio 1:10 of the input divider at channel A - ratio 1:1 of the input divider at channel B - ratio 1:10 of the input divider at channel B - rising trigger edge at channel A - falling trigger edge at channel A - rising trigger edge at channel B - falling trigger edge at channel B - trigger level V = 0 V at channel A (potentiometer [14] is closed) - trigger level is set via the potentiometer (channel A) at the unit - trigger level V = 0 V at channel B (potentiometer [18] is closed) - trigger level is set via the potentiometer (channel B) at the unit

7.4.3 Commands for Setting the Measuring Functions Frequency measurement FREQA FREQA? FREQB FREQB? FREQC FREQC? CHECK CHECK?

- setting the frequency measurement with channel A - single frequency measurement with channel A and transmission of the result - setting the frequency measurement with channel B - single frequency measurement with channel B and transmission of the result - setting the frequency measurement with channel C - single frequency measurement with channel C and transmission of the result - testing the unit functions - single test of the unit functions and transmission of the result

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GATE_1US GATE_1US GATE_1MS GATE_1MS GATE_1MS GATE_1S GATE_1S

- gate times: t =

10 s 100 s 1 ms 10 ms 100 ms 1s 10 s

Frequency Ratio Measurement RATAB RATAB? RATCB RATCB? NPER_1Ex

- setting the frequency ratio measurement A/B - single frequency ratio measurement A/B and transmission of the result - setting the frequency ratio measurement C/B - single frequency ratio measurement C/B and transmission of the result - exponent x = 2 ,3 ,4 ,5 ,6 ,7 and 8 for decadic multiple of the periodic length

Periodic Length Measurement PERA PERA? PERB PERB?

- setting the periodic length measurement with channel A - single periodic length measurement with channel A and transmission of the result - setting of the periodic length measurement with channel B - single periodic length measurement with channel B and transmission of the result

Time Interval Measurements TIMEAB TIMEAB?

- setting the time interval measurements via channels A and B - single time interval measurements via channels A and B and transmission of the result

Pulse Counting TOTA TOTB TOM_EXT TOM_MAN TOTA? TOTB? START

- setting the pulse counting with channel A - setting the pulse counting with channel B - pulse counting by external triggering - pulse counting by manual triggering - single pulse counting on channel A and transmission of the result - single pulse counting on channel B and transmission of the result - starting of the pulse counting and saving of the result in the output buffer

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7.4.4 Commands for Reading the Unit Settings ATTA? ATTB? SLOPA? SLOPB? LEVA? LEVB? GATE? NPER? TOM?

- input divider at channel A? - input divider at channel B? - trigger edge at channel A? - trigger edge at channel B? - choice of trigger level at channel A? - choice of trigger level at channel B? - current gate time? - set coefficient of the periodic length measurement on channel B? - current triggering of the pulse counting?

7.5 Measuring by Remote Control
For external control of the unit the respective connecting cable of the system interface GPIB or RS-232C has to be connected before switching on the operational voltage. After switching on the counter is in starting position and it can receive commands. The remote control is displayed on LED REMOTE [13]. It should be noted that single commands or groups of commands have to be separated by semicolon (ASCII: ";" = 59) and ended by the end character. Certain commands or messages can contain parameters or measuring results which are separated by a separation character from the command. Single commands can be written one after the other in one command line, the length of which may not exceed 64 characters.
Separation and end characters during transmission of commands:

ASCII separation characters

GBIP
SP = 32 (dec.) NUL to HT = 0 to 9 (dec.) VT to US = 11 to 31 (dec.) LF = 10 (dec.) LF = 10 (dec.) + END (EOI true) last sign of the command + END (EOI true)

RS-232C
SP = 32 (dec.)

end characters

LF = 10 (dec.)

Separation and end characters during receiving of messages:

ASCII separation characters end characters
SP = 32 (dec.)

GBIP

RS-232C
SP = 32 (dec.) CR + LF = 13 + 10 (dec.)

LF = 10 (dec.) + END (EOI true)

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7.6 Program Examples (Q-Basic)
1 11 12 13 14 15 16 17 18 19 2 21 22 23 24 25 26 27 28 29 3 31 32 33 34 35 36 37 38 39 4 41 42 43 44 45 46 47 48 49 5 51 52 53 54 REM REM REM REM REM REM REM REM REM REM DIM REM REM ******************************************************* THE EXAMPLE OF USING UZ 25 WITH GPIB BOARD AT-GPIB/TNT AND SOFTWARE NI-488.2 OF NI The UZ 25 measures frequency of signals via channel B Its GPIB primary address is 7 Example program using NI-488.2 subroutines Merge this code with DECL.BAS (when using NI-488.2) ******************************************************* *** SET UP INTERFACE AT-GPIB/TNT *** ADDRLIST%(31) : ADDRLIST%()=7: ADDRLIST%(1)=NOADDR% BDINDEX%=: PAD%=7 CALL SENDIFC(BDINDEX%) *** SET UP INTERFACE AND STATUS REPORTING *** CALL ENABLEREMOTE (BDINDEX%,ADDRLIST%()) CALL DEVCLEAR(BDINDEX%,PAD%) WRT$="*RST;*CLS" CALL SEND (BDINDEX%,PAD%,WRT$,NLEND%) *** FUNCTION AND MODE SETTING *** WRT$="FREQB;GATE_1S" CALL SEND (BDINDEX%,PAD%,WRT$,NLEND%) *** START OF MEASUREMENT *** WRT$="MEAS?" CALL SEND (BDINDEX%,PAD%,WRT$,NLEND%) *** RECEIVE RESPONSE MESSAGE *** RD$= SPACE$(2) CALL RECEIVE (BDINDEX%,PAD%,RD$,STOPEND%) CLS:PRINT "Frequency of channel B : ",RD$ *** SET UP DEVICE AND SET LOCAL MODE *** WRT$="*RST;*OPC?" CALL SEND (BDINDEX%,PAD%,WRT$,NLEND%) RD$= SPACE$(2) CALL RECEIVE (BDINDEX%,PAD%,RD$,STOPEND%) CALL ENABLELOCAL (BDINDEX%,ADDRLIST%()) REM REM *** DISABLE THE SOFTWARE AND HARDWARE *** V% = CALL IBONL (BDIDEX%,V%) END

REM REM REM REM REM REM

REM REM

REM

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Operating Instructions UZ 2500 1/2000

5 1 2 25 3 4 5 6 7 8 9 1 11 12 13 14 15 16 17 18 19 2 21 22 23 24 25 26 27 28 29 3

REM ******************************************************* REM THE EXAMPLE OF USING UZ 25 with RS-232C board REM The UZ 25 measures frequency of signals via input B. REM ******************************************************* CLS REM *** SET UP INTERFACE COMMANDS *** IDCL$=CHR$(2):IREN$=CHR$(9):ILLO$=CHR$(25):IGTL$=CHR$(1) REM REM *** OPENING COMMUNICATION FILE *** OPEN "com2:12,n,8,1,CS25,FOR RANDOM LF" AS #1 REM REM *** SET UP DEVICE AND STATUS REPORTING *** PRINT #1,IDCL$;IREN$;ILLO$;"*RST;*CLS" REM REM *** FUNCTION AND MODE SETTING *** PRINT #1,"FREQB;GATE_1S" REM REM *** START OF MEASUREMENT *** PRINT #1, "MEAS?" REM REM *** RECEIVE RESPONSE MESSAGE *** INPUT #1 ,A$ PRINT "Frequency of channel B : ";A$ REM REM *** SET UP DEVICE AND SET LOCAL MODE *** PRINT #1,"*RST;*OPC?" INPUT #1 ,A$ PRINT #1,IGTL$ REM REM *** CLOSE STATEMENT *** CLOSE #1 END

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8 Maintenance
The unit does not require special maintenance if it is used and handled correctly. Only use a soft wet rag with some soap-suds or a soft rinse liquid for cleaning. Avoid acrid cleanser and solvents. Service work should only be done by trained personnel. In case of repairs it is vital to ensure that the design characteristics of the unit are not changed thus reducing the safety and that replacement parts match the original ones and are installed properly (original state).
Warning!

The unit must be separated from all power sources before maintenance work is carried out and before parts or fuses are repaired or replaced.

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9 Appendix
9.1 Declaration of Conformity

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