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PU4ASL
Topward 8120
FUNCTION GENERATOR
Operation Manual
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PU4ASL
Topward 8120
FUNCTION GENERATOR
Copyright
Copyright © 1996 by this company. All rights reserved. No part of this publication may be reproduced in
any form or by any means without the written permission of this company.
Disclaimer
This company makes no representations or warranties, either expressed or implied, with respect to the
contents hereof and specifically disclaims any warranties, merchant ability or fitness for any particular
purpose. Further, this company reserves the right to revise this publication and to make changes from
time to time in the contents hereof without obligation of this company to notify any person of such
revision or changes.
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8120 FUNCTION GENERATOR
Table of Contents
1. Overview ............................................................................................................................ 1
1.1 Introduction ............................................................................................................... 1
1.2 Unpacking and Checking .......................................................................................... 2
2. Front and Rear Panels ...................................................................................................... 3
2.1 Front Panel................................................................................................................ 3
2.2 Rear Panel ................................................................................................................ 4
3. Operation ........................................................................................................................... 9
3.1 Instrument Turn-on ................................................................................................... 9
3.2 Main Generator ......................................................................................................... 9
3.3 Voltage Control Frequency ..................................................................................... 10
3.4 Frequency Counter ................................................................................................. 10
3.5 Sweep ..................................................................................................................... 10
4. Operation Cautions ......................................................................................................... 14
5. Maintenance.................................................................................................................. ... 15
5.1 Cleanness ............................................................................................................... 15
5.2 Changing the Fuse.................................................................................................. 15
5.3 Changing the Voltage ............................................................................................. 16
5.4 Environment ............................................................................................................ 17
6. Specifications .................................................................................................................. 18
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8120 FUNCTION GENERATOR
Safety Instruction
Before operating this product, please read carefully the safety symbols and definitions described
here.
This product complies with class á safety specifications.
Installation category (overvoltage category): Class .
Before operating this product, please check the voltage requirements and specifications as
described in this operating manual.
Proper grounding refers to the proper connection from the grounding point of the power source to
the grounding terminal of this product.
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8120 FUNCTION GENERATOR
Safety Symbols
Earth (Ground) Terminal
Protective Conductor Terminal
ON(SUPPLY)
OFF(SUPPLY)
Waning
Any grounding terminal or earth terminal can generate electrical conductivity that may harm or
endanger the user.
When operating this product, please place it in a well-ventilated environment.
Do not place this product in an area that is directly exposed to sunlight or under high humidity.
When you need to clean the outer surface of the product, use a clean and dry cloth.
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8120 FUNCTION GENERATOR
1. Overview
The 8120 is a portable, bench type mufti-purpose digital function generator / counter capable of
producing 6 different waveforms. These are Sine, Square, Triangle, Pulse, Ramp and Sweep.
1.1 Introduction
The 8120 has the following features:
Frequency adjustable from 0.1Hz to 2MHz in 7 ranges.
Output variable from 5mVp-p to 20Vp-p.
Duty of ramp wave and pulse wave can be continuously variable between 20% and 80% with 50:50
calibrated switch. The frequency remains unchanged.
DC offset from -10V to +10V can be added to all output waveforms.
6 digits, green 7-segment LED to display frequency.
Built-in 100MHz frequency counter with 50mV sensitivity.
Linear sweep or Log sweep is selectable with width up to 1000:1 and rate from 10mS to 5S.
With V.C.F. (voltage control frequency) that allows the frequency to be controlled by an external
voltage.
Output with short circuit and external input protection.
Passes EMC test (CE maked).
Meets IEC-1010-1 (EN61010-1) safety requirements.
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8120 FUNCTION GENERATOR
1.2 Unpacking and Checking
Your 8120 is packed in polyfoam to protect it during shipment. You should keep this material ,as
well as the shipping box, in case the unit must be moved or shipped again.
The box should include the following items:
Model 8120 Digital Function Generator
Removable AC line cord
BNC to Alligator clip cable
Operation manual
Please check to see that all of the above items are included. You should contact your sales if
anything is missing.
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8120 FUNCTION GENERATOR
2. Front and Rear Panels
The following is an explanation of the function of each of the front and rear panel controls and
connectors. You should refer to Figure 1 & Figure 2 for the location of each control / connector.
2.1 Front Panel
Figure 1 Front Panel
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8120 FUNCTION GENERATOR
2.2 Rear Panel
Figure 2 Rear Panel
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8120 FUNCTION GENERATOR
1. AMPLITUDE
The amplitude of output waveform is variable. Turning the knob clockwisely will increase the
amplitude.
2. FUNCTION
This bank of switches is used to select the output waveform. Only one of these switches can be
depressed at a time.
3. FREQUENCY
This knob is used to adjust the output frequency. The frequency is set by the setting of this knob
and the RANGE switch (4) explained below.
4. RANGE / GATE TIME
This bank of switches is used to select the frequency range produced. At the same time, the
counter gate time is changed.
5. RAMP / PULSE
This combination switch / adjustment is used to adjust the duty cycle of the square / pulse and
triangle / ramp waveforms. When the knob is pushed in, the duty cycle is fixed at 50%. When pulled
out, the duty cycle is adjustable between 20% and 80%, and the output frequency is unchanged.
6. ATTENUATION
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8120 FUNCTION GENERATOR
When this push button is out, the signal is passed to the output unchanged. If the switch is
depressed, the output signal is attenuated by -30dB.
7. DC OFFSET
This knob allows a variable DC voltage between -10V to +10V to be added to the output signal.
Note that the knob has to be pulled out for the offset to affect the signal. When the knob is pushed in,
no offset voltage is added.
8. OUTPUT
This BNC connector provides the output signal for all waveforms.
9. POWER ON
This is the main power switch. It is a push on / push off type.
10. SWEEP WIDTH
10.1 Sweep width can be controlled from 1 to 1000 times.
10.2 When this knob is pushed in, the sweep is in LINEAR mode. When pulled out, the sweep is in
LOG mode.
11. SWEEP RATE
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8120 FUNCTION GENERATOR
11.1 When switch off, there is no sweep function.
11.2 When switch on, the sweep rate can be adjusted from 10mS to 5S.
12. FUNC / COUNT
When the switch is out, the 6 digits DISPLAY (13) shows the generator frequency. When the switch
is in, the DISPLAY (13) shows the input frequency of counter.
13. FREQUENCY DISPLAY
This is a 6-digit 7-segment LED display that shows the output frequency of the main generator or
the input frequency of the counter.
14. INDICATORS
OVFL, GATE, KHz, Hz LEDs indicate frequency overflow, gate time and frequency units in KHz, Hz.
15. SYNC OUT
This connector supplies a TTL compatible signal. The output is unaffected by either the FUNCTION
(2) or AMPLITUDE (1) controls. The output frequency is the same as the of OUTPUT signal (8).
16. V.C.F. IN
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8120 FUNCTION GENERATOR
An external voltage from 0V DC to +5V DC can be input to control the output frequency up to
1000:1.
17. COUNT IN
This is the input connector for the 100MHz frequency counter. FUNC / COUNT switch (12) must be
depressed.
18. SWEEP OUT
The sawtooth waveform controlling the sweep output can be taken out. The period of this sawtooth
waveform is controlled by SWEEP RATE (11) from 10mS to 5S and the voltage is controlled by
SWEEP WIDTH (10).
19. POWER VOLTAGE SETTING SWITCH
There are two power voltages 115V and 230V can be selected. Before applying power to your 8120,
make sure that this switch is correctly set for your power source.
20. POWER SOCKET WITH FUSE HOLDER
There are two fuses put inside the FUSE HOLDER. One of them is for square use.
3. Operation
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8120 FUNCTION GENERATOR
3.1 Instrument Turn-on
WARNING
Before applying power to your 8120, make sure that the POWER VOLTAGE SETTING SWITCH
(19) is correctly set for your power source.
3.2 Main Generator
A. Select the desired waveform using the FUNCTION switch (2). To generate a ramp or pulse
output, pull out the RAMP / PULSE knob (5) and set to the desired duty cycle.
B. Set the desired frequency with the FREQUENCY control dials (3) and the RANGE switches (4).
C. Adjust the output amplitude with the AMPLITUDE control (1) to the desired level. If a very small
signal is required, the ATTENUATION switch (6) can be depressed.
D. Set DC offset voltage with the DC OFFSET control (7).
E. Use the SYNC output terminal (15) if TTL compatible lever is required.
3.3 Voltage Controlled Frequency
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8120 FUNCTION GENERATOR
Supply a trim voltage between 0V DC to +5V DC to V.C.F. IN terminal (16). The output frequency
will be varied over 1000:1.
3.4 Frequency Counter
A. Push in the FUNC / COUNT switch (12).
B. Apply input signal to COUNT IN (17).
C. Select GATE TIME (4) for best resolution.
D. Use ATTENUATION (6) for large input signal to avoid damage to the instrument.
3.5 Sweep
A. Follow A, B, C, D Steps of 3.2 Main Generator to set the desired waveform.
B. The set frequency is the upper frequency of the sweep output.
C. Turn on the SWEEP RATE switch (11) to start the sweep mode.
D. Adjust the sweep rate from 10mS to 5S.
E. Adjust the SWEEP WIDTH switch (10) to set the lower frequency of the sweep output.
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8120 FUNCTION GENERATOR
F. Pull out or push in the SWEEP WIDTH switch (10) to select LOG mode or LINEAR mode.
G. LOG mode means the frequency of sweep output changes in Logarithm curve and LINEAR
mode means in Linear curve.
H. Example:
Sweep : 100Hz 100KHz
Width
Sweep : 500mS
Rate
Sweep : Linear or Logarithm
Type
1. Set the frequency to 100KHz.
2. Turn on the SWEEP RATE switch (11) to start the sweep mode. Monitoring the sawtooth
waveform of SWEEP OUT (18) and adjust the SWEEP RATE (11) to meet 500mS.
3. Pull out or push in the SWEEP WIDTH switch (10) to select LOG mode or LINEAR mode.
4. Adjust the SWEEP WIDTH switch (10) to let the waveform sweep from 100Hz to 100KHz.
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8120 FUNCTION GENERATOR
f L fH
Sweep
Waveform
!
Sweep Out
Sweep Time
500mS
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8120 FUNCTION GENERATOR
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8120 FUNCTION GENERATOR
Please observe the following when operating your 8120 Function Generator:
1. To assure operation within the published specifications, allow the unit to warm up and
stabilize for at least 20 minutes.
2. Failure to observe the operating procedure listed below will result in damage to the unit and
oid your warranty.
3. Do not supply more than 10 Volts (DC+AC peak) into:
OUTPUT terminal (8) [Protected to 30 Volts (DC+AC
peak)] V.C.F. IN terminal (16)
SYNC OUT terminal (15)
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5. Maintenance
8120 FUNCTION GENERATOR
5.1 Cleanness
Please clean outer casing with dry cloth and do not release the outer casing except maintenance
staffs.
5.2 Changing the Fuse
The fuse is located inside the POWER SOCKET WITH FUSE HOLDER (20) (refer to Figure 2).
You need to change the fuse when:
bthe fuse is blown out
you change the POWER voltage
In any case, replace the fuse with one of the same rating. Refer to Table 1 for the type of fuse used
for different input voltage.
NOTE : Unplug the power cord before you change the fuse.
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5.3 Changing the Input Voltage
8120 FUNCTION GENERATOR
To change the voltage, follow these steps:
1. Use a flathead screwdriver to switch the POWER VOLTAGE SETTING SWITCH (19) (refer
to Figure 2) to meet the correct POWER voltage.
2. Refer to the correct fuse rating on Table 1. Use a flathead screwdriver to open the cover of
POWER SOCKET WITH FUSE HOLDER (14) and change the correct fuse.
Model Fuse
Time-Delay Type 5x20mm
115V 230V
8120 T160mA/250V T125mA/250V
Table 1 Fuse Specification
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5.4 Environment
Operating : +5 :
~+40 :
8120 FUNCTION GENERATOR
temperature
Operating moisture : 80 =(+5 : +31 :),50 =(+31 : +40 :)
~ ~
Storage temperature : -20 :
~ +70 :
Storage moisture : under 80 =
We here declare the functional specification for EMS Verification (IEC 801-3) of our 8120 signal
generator and 8120 optional counter unsuitable IEC801-3 and EN55011 standards.
It should be considered insignificant and acceptable that some disturbance of frequency shift, less
than 5% or crosstalk may happen, but self-recoverable. That means such a situation is within our
specification and should be considered as normal performance within the specification limit.
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6. Specifications
8120 FUNCTION GENERATOR
ITEM 8120
MAIN OUTPUT
Frequency Range 0.1Hz to 2MHz in 7 Ranges
Waveforms Sine, Square, Triangle, Ramp, Pulse, Sweep
Amplitude 20 Vp-p, Open; [Output protected up to 30V (DC+AC)]
Attenuator 0dB, -30dB
Output Impedance 50 Ë 10%
DC Offset +10V-10V (Open)
Duty Control 80:20 to 20:80 Continuously Variable with 50:50 calibrated switch
(Frequency unchanged)
Frequency Accuracy Counter accuracy
Distortion <1%, 10Hz100KHz
Rise / Fall Time <100nS
V.C.F. 0 to +5V Control frequency to 1000:1
Safety Requirements Meets IEC-1010-1 (EN 61010-1)
EMC Requirements Yes
SYNC OUTPUT
Rise Time <25nS
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8120 FUNCTION GENERATOR
Level >3Vp-p (Open), 20 TTL Load
SWEEP OUTPUT
Type Linear, Log
Width >1000:1, continuously variable
Rate From 10mS to 5S, continuously variable
Ramp Output Yes
FREQUENCY COUNTER
Display 6 Digits 0.4" Green LED display with Hz, KHz, GATE, OVFL LED
Mode Func / Count
Attenuator 0dB, -30dB
Accuracy (Time base accuracy+1 count)
Time Base 10MHz 10ppm (23 : 5 :)
Resolution 0.1Hz, 1Hz, 10Hz, 100Hz, 1KHz
Gate Time 10S, 1S, 0.1S, 0.01S
Range 10Hz to 100MHz
Sensitivity 25mVrms (10Hz to 10MHz),50mVrms (10MHz to 100MHz)
Maximum Input 150Vrms
Input Impedance 1M Ë// 100pF
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8120 FUNCTION GENERATOR
POWER ACV 115 / 230,10 =,60 / 50 Hz
DIMENSION
Machine (mm) 262(W)x85(H)x260(D)
Package (mm) 387(W)x192(H)x347(D)
Gross Weight 2.85Kg
Net Weight 2.0Kg
Accessories ACS-003 BNC to alligator clip cable x 1, Operation manual x 1
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· PAINEL FRONTAL
14 - LEDs Indicadores
Os LEDs OVFL, GATE, KHz, Hz indicam estouro de frequência, tempo de porta e unidades
de frequência em KHz, Hz.
1. Gate
2. OVFL - Over flow
3. KHz
4. Hz
13 - Display de 7 segmentos
Este é um display LED de 6 dígitos e 7 segmentos que mostra a frequência de saída do gerador
principal ou a frequência de entrada do contador (frequencimetro).
4 - Range Hz / Gate Time
Este banco de interruptores é usado para selecionar a faixa de frequência ou o tempo do disparo do
contador (frequencimetro) também é alterado.
1. 1M
2. 100K
3. 10K
4. 1K
5. 100
6. 10
7. 1
12 - Chave de Função
Quando o interruptor está desligado, o DISPLAY de 6 dígitos (13) mostra a frequência do gerador.
Quando o interruptor está ativado, o DISPLAY (13) mostra a frequência de entrada do contador.
1. FUNC - Gerador
2. COUNT - Freqüêncímetro
2 - Chaves de Função de Ondas
Este banco de interruptores é usado para selecionar a forma de onda de saída. Apenas um desses
interruptores pode ser pressionado por vez:
1. Onda quadrada
2. Onda Triangular
3. Onda Senoidal
6 - Chave Atenuadora ( ATT)
Quando este botão está desligado, o sinal é passado para a saída inalterado. Se o interruptor for
pressionado, o sinal de saída é atenuado em -30dB.
1. 0 dbs
2. -30 dbs
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9 - Chave Liga e Desliga
Este é o interruptor de alimentação principal. Tipo de botão de pressão, apertou liga apertou
novamente desliga.
3 - Botões de Controle de Freqüência
Este botão é usado para ajustar a frequência de saída. A frequência é definida pela configuração deste
botão e da chave RANGE (4) explicada abaixo
1. MAIN - ajuste grosso
2. FINE - ajuste fino
5 - Botão RAMP/ PULSE
Esta combinação de chave/ajuste é usada para ajustar o ciclo de trabalho das formas de onda
quadrada/pulso e triangular/rampa. Quando o botão é pressionado, o ciclo de trabalho é fixado em
50%. Quando puxado para fora, o ciclo de trabalho é ajustável entre 20% e 80% e a frequência de
saída permanece inalterada.
Com a função PULL TO VAR ( ao puxar o botão para fora ativa a função de ajuste)
Ao empurrar o botão para dentro, memoriza a função ajustada
1 - Botão de Ajuste de AMPLITUDE
A amplitude da forma de onda de saída é variável. Girar o botão no sentido horário aumentará a
amplitude.
7 - Botão de ajuste de OFFSET
Este botão permite que uma tensão DC variável entre -10V a +10V seja adicionada ao sinal de saída.
Observe que o botão deve ser puxado para fora para que o deslocamento afete o sinal. Quando o botão
é pressionado, nenhuma tensão de compensação é adicionada.
Botão com a função PULL TO VAR ( ao puxar o botão para fora ativa a função de ajuste)
Ao empurrar o botão para dentro, memoriza a função ajustada
11 - Botão de RATE SWEEP
11.1 Quando desligado, não há função de varredura.
11.2 Ao ligar, a taxa de varredura pode ser ajustada de 10mS a 5S
Botão com a função de liga/desliga o ajuste de RATE
10 - Botão de WIDTH SWEEP
10.1 A largura de varredura pode ser controlada de 1 a 1.000 vezes.
10.2 Quando este botão é pressionado, a varredura está no modo LINEAR. Quando puxado
para fora, a varredura está no modo LOG.
Botão com a função PULL TO LOG ( ao puxar o botão para fora ativa a função de ajuste)
Ao empurrar o botão para dentro, memoriza a função ajustada
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8 - Conector de saída OUTPUT
Este conector BNC fornece o sinal de saída para todas as formas de onda.
· PAINEL TRASEIRO
20 - Tomada de entrada de energia com proteção
Existem dois fusíveis colocados dentro do PORTA FUSÍVEIS. Um deles é para uso quadrado.
19 - Chave seletora de Tensão 115/220V
Existem duas tensões de alimentação 115V e 230V que podem ser selecionadas. Antes de aplicar
energia ao seu 8120, certifique-se de que esta chave esteja configurada corretamente para sua fonte de
energia.
15 - Conector SYNC OUT
Este conector fornece um sinal compatível com TTL. A saída não é afetada pelos controles
FUNCTION (2) ou AMPLITUDE (1). A frequência de saída é a mesma do sinal OUTPUT (8).
Permite sincronizar Gerador com Osciloscópio
16 - Conector VCF IN
Uma tensão externa de 0 Vcc a +5 Vcc pode ser inserida para controlar a frequência de saída de até
1000:1.
Permite entrar com sinal VCF
17 - Conector COUNT IN
Este é o conector de entrada para o contador de frequência de 100MHz. O botão FUNC / COUNT
(12) deve ser pressionado
Permite entrar com sinais de freqüência ( função frequencímetro)
18 - Conector SWEEP OUT
A forma de onda dente de serra que controla a saída de varredura pode ser retirada. O período desta
forma de onda dente de serra é controlado por SWEEP RATE (11) de 10mS a 5S e a tensão é
controlada por SWEEP WIDTH (10).
Permite sair com sinais para Varredura
Especificações:
Waveforms Sine, square, triangle, ramp, pulse
Amplitude 20Vp-p, Open [Output protected up to 30V (DC+AC)]
Attenuator 0dB, 30dB
Output Impedance 50W 10% for main and sync
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DC Offset +10V ~ -10V
20:80 (frequency unchanged) continuously variable with 50:50 calibrated
Duty Control
switch
V.C.F. 0 to +5V control frequency to 1000:1
Frequency Range 0.1Hz to 2MHz in 7 ranges
Frequency Accuracy Counter accuracy
Distortion < 1%, 10Hz ~ 100KHz
Rise/Fall Time < 100nS
Rise Time for Sync
< 25nS
Output
Sync Output Level > 3Vp-p (Open), 20 TTL Load
Sweep Type Linear, Log
Sweep Width > 100:1, continuously variable
Sweep Rate From 10mS to 5S, continuously variable
Frequency Counter
6 digits 0.4" green LED display with Hz, KHz, GATE, OVFL LED
Display
Frequency Counter
Func./Count
Mode
Frequency Counter
0db, 30dB
Attenuator
Frequency Counter
(Time base accuracy+1 count)
Accuracy
Frequency Counter Time
10MHz 10ppm (28° C 5° C)
Base
Frequency Counter
0.1Hz, 1Hz, 10Hz, 100Hz, 1KHz
Resolution
Frequency Counter Gate
10S, 1S, 0.1S, 0.01S
Time
Frequency Counter
10Hz to 100MHz
Range
Frequency Counter
50mVrms (10Hz to 100MHz)
Sensitivity
Frequency Counter
150Vrms
Maximum Input
Frequency Counter
1MW//100pF
Input Impedance
Power Requirement 115/230 Vac; 50/60Hz single phase
Accessories Supplied Power cord, hook-up leads, intruction manual
Dimension 10.2"(W) x 3.3"(H) x 10.1"(D)
Weight 4.4 Pounds
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