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Instruction Manual
Model 194
High Speed Voltmeter
01985, Keithley Instruments, Inc.
Instrument Division
Cleveland, Ohio, U.S.A.
Document Number: 194-901-01 Rev. A
SAFETY PRECAUTIONS
The following safety precautions should be observed before using the Model 194.
This instrument is intended for use by qualified personnel who recognize shock hazards and arc famili.lr
with the safety precautions required to avoid possible injury. Read over this manual carefully before operating
the instrument.
Exercise extreme caution when a shock hazard is present at the instrument's input. The American National
Standards Institute (ANSI) states that a shock hazard exists when voltage levels greater than 3OV RMS 01
42.4V peak are present. A good safety practice is to expect that a hazardous voltage is present in any unknown
circuit before measurement.
Do not exceed 3OV RMS between input low and earth ground.
Inspect your test leads for possible wear, cracks, or breaks before coach use.
For maximum safety, do not touch the test leads or the instrument while power is applied to the circuit undrr
test. Turn the power off and discharge all capacitors before connecting or disconnecting the instrument.
Do not touch any object which could provide a current path to the common side of thr circuit under test
or power line (earth) ground. Always make measurements with dry hands while standing on `1 dry, insulated
surface capable of withstanding the voltage being measured.
Do not exceed the instrument's maximum allowable input as defined in the specifications and operation
section of this manual.
SPECIFICATIONS
CHANNEL 1
-- ~..l..y.~.I...u..~u
MATH FUNCTIONS
INPUT IMPEDANCE: l.lMt, (I.OMll on 200" range) shunted by
<47pF. A"ERAGE: ~1% = v...,
"
MAXIMUM ALLOWABLE INPUT: 250" peak, 2xlO'V*Hz.
PEAK TO PEAK: Difference between maximum and minimum v.,,ws
MAXIMUM COMMON MODE VOLTAGE: 30" rms, 42V Peak, of samples.
SxlO~".Hz.
PLUS PEAK: Maximum va,w of samples.
COMMON MODE RE,ECTfON RATIO: >6OdS at dc to IkHz, IkR
unbalance. MINUS PEAK: Minimum value of samplcs~
DIFFERENTIAL NONLINEARITY: Ih-Bit: 52 LSD. 8 bit: 50.5 LSB.
TEMPERATURE COEFFlClENT (Of'-18T & **^-5o"c,: < -t(O.l Y
II I
applicable accuracy specification)i"C.
z: (V,-TV...,'
STANDARD DE",AT,ON: s-u
II
DYNAMIC CHARACTERISTICS
16 BIT 8 BIT
Minimum Sample Rate 10,s (;;ktfz) 1ps (IMHz)
TRUE
ROOT MEAN SQUARE:
II
Maximum Sample Rate IS n 2
Sample Rate Resolution lOOX loons INTEGRAL: (`I*".+%"..,+ ,F, V.) 1,
Number of Samples 1 to 32k 1 t" 65k
Sample interval Accuracy DIFFERENCE: Channel 1 Channrl 2,
(typical, excluding time base RATIO: Channel 1 / Chnnncl 2.
accuracy, 0.4"s 2ns
v,: Voltage of sanlple i,
SIGNALINOISE RATIO: 5OdB for full range IOOkHz sine input. n: Total number of samples,
SLEW RATE: 13"lps minimum. i: Locn,ion of individual ssmplc.
SETTLING TIME: 1 gs to 0.1% of final value. t,: Sample intewa,.
CHANNEL CROSSTALK: <6OdB at SOOkHz.
INPUT CO"PI.ING: Ac, dc, ground.
FREQUENCY RBSPONSE (Filter Off,:
O.ZdB IdlJ 3dB ANALOG OUTPUT
dc (15Hz) 20kHz dc @Hz) 20OkHz dc (2Hz) 750kt tz
( ) indicates ac coupled performance. MODES 0"TPuTS USED
LOW PASS FILTER: 50kHz, 500kHz, single pole. CRT x, y, z (blanking)
Oscilloscope y, % (trigger)
Slow Plot x, y, z (pen upidown)
TRIGGER CHARACTERISTICS Strip Chart y
DELAY:
Pm-Trigger: -Zk Y OUTPIJT:
O-10" I",, scale. 2.44mV rfS"I"ti0".
0.,ov full scale, 2.44mV rCSO,"ti"n
In/ samples are stored prior to triggering.
Past-Trigger: 1 gWi"g.
6. z 0"TP"T: 0". 5v or 15".
TRIGGER: ZOOM MAGNIFICATION: O.,:, to 1O"O:l
SOURCE DESCRlPTlON PAN: Across entire memory.
Input Signal Slope: + or
Level: Selectable over input voltage
range and resolution.
External: Negative TTL edge. REAL TIME (DMA) OUTPUT
Front Pane,: Manual pushbutton.
IEEE-488 Interface: 16 programmable trigger modes. FORMAT: Binary, I&bit or S-bit.
Other Channel: ,nterna,,y generated. RATE: Same as Sample Rate.
TIMESASE: Internal: IOMHZ *o.o*%. CONTROL LINES: End of Sample, Overrun, tligh Byte. I.ow t,yW
Extenta,: IOMHZ nominal, Tn..
I
1 FRONT PANEL PROGRAMS 1 1 GENERAL
0 IEEE ADDRESS: Set IEEE address. DISPLAY: Fourteen-digit alphanumeric LED display. Function and
1 SELF TEST: Performs internal RAM and ROM check. IEEE bus status also displayed.
2 DIGITAL CALIBRATION: Executes calibration procedure. RANGING: Manual or autoranging.
3 CALlBRATlON STORAGE: Stores calibration constants in WARMUP: One hour to rated accuracy.
NVRAM. OPERATING ENVIRONMENT: 0" to 50