EC Declaration of Conformity
We
GOOD WILL INSTRUMENT CO., LTD.
No.7-1, Jhongsing Rd, Tucheng City, Taipei County 236, Taiwan
GOOD WILL INSTRUMENT (SUZHOU) CO., LTD.
No.69 Lushan Road, Suzhou New District Jiangsu, China.
declares that the below mentioned product
GFG-8215A, GFG-8216A,GFG-8217A, GFG-8219A, GFG-8250A,GFG-8255A
are herewith confirmed to comply with the requirements set out in the Council Directive
on the Approximation of the Law of Member States relating to Electromagnetic
Compatibility (89/336/EEC, 92/31/EEC, 93/68/EEC) and Low Voltage Equipment
Directive (73/23/EEC, 93/68/EEC).
For the evaluation regarding the Electromagnetic Compatibility and Low Voltage
Equipment Directive, the following standards were applied:
EN 61326-1: Electrical equipment for measurement, control and laboratory use ––
EMC requirements (1997+A1: 1998)
Conducted and Radiated Emissions
EN 55011 Group I class A: 1991
Current Harmonic
EN 61000-3-2: 1995
Voltage Fluctuat ion
EN 61000-3-3: 1995
Electrostatic Discharge
EN 61000-4-2: 1994
Radiated Immunity
ENV 50140: 1993
Electrical Fast Transients
EN 61000-4-4: 1995
Surge Immunity
EN 61000-4-5: 1995
Conducted Susceptibility
EN 61000-4-6: 1996
Power Frequency Magnetic field
EN 61000-4-8: 1993
Voltage Dips/ Inte rrupts
EN 61000-4-11: 1994
FUNCTION GENERATOR-SERIES
INSTRUCTION MANUAL
TABLE OF CONTENTS
1. SAFETY SUMMARY………………………………………. 1
2. INTRODUCTION…………………………………………… 5
3. SPECIFICATION……………………………………………. 7
4. FUNCTION DESCRIPTION.………………………………. 13
5. USAGE DESCRIPTION……………………………………. 17
6. APPLICATION NOTE……………………………………… 23
7. MAINTENANCE…………………………………………… 33
Low Voltage Equipment Direc ti ve 73/23/EEC & amended b y 93/68/EEC
Safety Requirements
IEC/EN 61010-1:2001
2
FUNCTION GENERATOR-SERIES
INSTRUCTION MANUAL
1.SAFETY TERMS AND SYMBOLS
Please take a moment to review these safety terms and symbols
which may appear in this manual or on Equipment to prevent damage
to the Function Generators.
WARNING. Warning statements identify condition or
FUNCTION GENERATOR-SERIES
INSTRUCTION MANUAL
DANGER High Voltage
ATTENTION refer to Manual
practices that could result in injury or loss of life.
CAUTION. Caution statements identify conditions or
practices that could result in damage to this product or
other property.
1
Protective Conductor Terminal
(ground) Earth Terminal
Frame or Chassis Terminal
2
FUNCTION GENERATOR-SERIES
INSTRUCTION MANUAL
FUNCTION GENERATOR-SERIES
INSTRUCTION MANUAL
FOR UNITED KINGDOM ONLY
NOTE: This lead/appliance must only be wired by
competent persons
WARNING: THIS APPLIANCE MUST BE EARTHED
IMPORTANT: The wires in this lead are coloured in
accordance with the following code:
Green/ Yellow: Earth
Blue: Neutral
Brown: Live(Phase)
As the colours of the wires in main leads may not correspond
with the colours marking identified in your plug/appliance,
proceed as follows:
terminal which is marked with the letter N or coloured Blue or
Black.
The wire which is coloured Brown must be connected to the
terminal marked with the letter L or P or coloured Brown or Red.
If in doubt, consult the instructions provided with the equipment
or contact the supplier.
This cable/appliance should be protected by a suitably rated
and approved HBC mains fuse : refer to the rating information
on the equipment and/or user instructions for details. As a
guide, cable
of 0.75mm² should be protected by a 3A or 5A fuse. Larger
conductors would normally require 13A types, depending on
the connection method used.
Any moulded mains connector that requires removal
/replacement must be destroyed by removal of any fuse & fuse
carrier and disposed of immediately, as a plug with bared wires
is hazardous if a engaged in live socket. Any re-wiring must be
carried out in accordance with the information detailed on this
label.
The wire which is coloured Green & Yellow must be connected
to the Earth terminal marked with the letter E or by the earth
symbol
or coloured Green or Green & Yellow.
The wire which is coloured Blue must be connected to the
3
4
FUNCTION GENERATOR-SERIES
INSTRUCTION MANUAL
2. INTRODUCTION
The Function Generator series are stable low distortion instruments
which generate signals in the frequency range up to 5MHz. Typical
applications include a wide range of audio response testing applications,
vibration testing, servo system evaluation, ultra sound applications, and etc.
FUNCTION GENERATOR-SERIES
INSTRUCTION MANUAL
7.A second output for TTL or adjustable CMOS pulses.
8.50 ohm main signal output with DC offset adjustment and 20dB attenuation
capability.
9. Supplied with two BNC test leads and AC power cord set.
These instruments include the following features: logarithmic and linear
sweep capabilities, together with a built in frequency counter. The sweep
capability simplifies the task of finding resonant points of speakers, filter
networks and other networks/structures. An oscilloscope may be connected
to this instrument for the response to be displayed. The counter can be
switched to measure and display the frequency of an external signal up to
150MHz.
z ADDITIONAL FEATURES
1.Low distortion wavefo rms (sine, triangular and sq uare) and ramp signal.
2.Signal output in seven decade stages, 0. 5Hz t o 5MHz f or GFG -8250 A/ 8 255A ,
0.3Hz to 3MHz for GFG-8215A/8216A/8217A/8219A.
3.Adjustable sweep time and sweep width both in linear and logarithmic
modes.
4.Duty cycle control with signal inversion capability.
5.External Voltage controlled Frequency (VCF).
6.AM or FM modulation modes with internal or e xte r nal modulation control.
z FEA T URES COMPARISON TABLE FOR MODELS:
MODEL
FEATURE
AM/FM
SWEEP
COUNTER
GCV Output
TTL/CMOS
VCF
Duty Cycle
Control
GFG-
8215A
───ˇ─ˇ
──ˇˇ─ˇ
─ˇˇˇˇˇ
───ˇ─ˇ
ˇˇˇˇˇˇ
ˇˇˇˇˇˇ
ˇˇˇˇˇˇ
GFG-
8216A
GFG-
8217A
GFG-
8219A
GFG-
8250A
GFG-
8255A
5
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FUNCTION GENERATOR-SERIES
INSTRUCTION MANUAL
3. SPECIFICATION
8215A/8216A/8217A/8219A
1.Main
Frequency Range
Amplitude
Impedance
Attenuator
DC Offset
Duty Control
Display
Range Accuracy
2.Sine W ave
Distortion
Flatness
3.T rian gle Wave
Linear
4.Square Wave
Symmetry
Rise or Fall Time
0.3Hz～3MHz(7 Range) 0.5Hz～5MHz(7 Range)
≧10Vpp(into 50Ωload) ≧10Vpp(into 50Ωload)
50Ω±10％ 50Ω±10％
-20dB±1dB×2 -20dB±1dB×2
＜-5V～＞5V
(into 50Ωload)
80%:20%:80% to 1MHz
Continued variable
6 digits LED display
*GFG-8215A does not hav e
display.
±5%+1Hz(at 3.0 position)
*only for GFG-8215A.
≦1％,0.3Hz～200kHz ≦1％,0.5Hz～100kHz
＜0.3dB,0.3Hz～300kHz
＜0.5dB,300kHz～3MHz
≧98％,0.3Hz～100kHz
≧95％,100kHz～3MHz
±2％,0.3Hz～100kHz ±2％,1Hz～100kHz
≦100ns at maximum output.
(into 50Ωload)
GFG-
GFG-
8250A/8255A
＜-5V～＞5V
(into 50Ωload)
80%:20%:80% to 1MHz
Continued variable
6 digits LED display
----------------------------
≦0.3dB,below 500kHz
≦1dB,below 5MHz
≧98％,0.5Hz～100kHz
≧95％,100kHz～5MHz
≦50ns at maximum output
(into 50Ωload)
FUNCTION GENERATOR-SERIES
INSTRUCTION MANUAL
GFG-
8215A/8216A/8217A/8219A
GFG-
8250A/8255A
5.CMOS Output
Level
Rise or Fall Time
4Vpp±1Vpp～14.5Vpp
±0.5Vpp adjustable
≦120ns ≦120ns
4Vpp±1Vpp～14.5Vpp
±0.5Vpp adjustable
6.TTL Output
Level
Fan Out 20 TTL load 20 TTL load
Rise or Fall Time
≧3Vpp ≧3Vpp
≦25ns ≦25ns
7.VCF
Input voltage
Input Impedance
8.GCV(for GFG-8219A/8255A only)
Output voltage
9.Sweep Operation(for GFG-8217A/8219A/8255A only)
Sweep/Manual Switch selector Switch selector
Sweep/Rate 100:1 ratio max. and adjustable 100:1 ratio max. and adjustable
Sweep/Time
Sweep/Mode Lin./Log. switch selector Lin./Log. switch selector
10.Amplitude Modulation(for GFG-8219A/8255A only)
Depth
MOD.Freq.
Carrier BW
EXT Sensitivity
0V～10V±1V(100:1) 0V～10V±1V(100:1)
10kΩ±10％ 10kΩ±10％
To set the voltage between
0V～2V as per different
frequency.
0.5Sec～30Sec adjustable 0.5Sec～30Sec adjustable
0～100％ 0～100％
400Hz(INT),DC～1MHz(EXT) 400Hz(INT),DC～1MHz(EXT)
100Hz～3MHz(-3dB) 100Hz～5MHz(-3dB)
≦10Vpp for 100％ modulation ≦10Vpp for 100％ modulation
To set the voltage between
0V～2V as per different
frequency.
7
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INSTRUCTION MANUAL
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INSTRUCTION MANUAL
GFG-
8215A/8216A/8217A/8219A
8250A/8255A
11.Fre quency Modulation (for GFG-8219A/8255A only)
Deviation
MOD.Freq.
EXT Sensitivity
0～±5％ 0～±5％
400Hz(INT),DC～20kHz(EXT) 400Hz(INT),DC～20kHz(EXT)
≦10Vpp for 10％ modulation ≦10Vpp for 10％ modulation
12.Frequency Counter
Int./Ext. Switch selector Switch selector
Range
Accuracy
Time base
Resolution
Input Impedance
Sensitivity
0.3Hz～3MHz
(5Hz～150MHz EXT)
Time base accuracy±1count Time base accuracy±1count
±20ppm(23℃±5℃) after
30 minutes warm up
The maximum resolution is
for 1Hz and
0.1Hz for 100MHz.
1MΩ/150pF 1MΩ/150pf
≦35mVrms(5Hz~100MHz)
≦45mVrms(100MHz~150MHz)
*GFG-8215A does not hav e
Frequency Counter function.
10nHz
0.5Hz～5MHz
(5Hz～150MHz EXT)
±20ppm(23℃±5℃) after
30 minutes warm up
The maximum resolution is
10nHz for 1Hz and
0.1Hz for 100MHz.
≦35mVrms(5Hz~100MHz)
≦45mVrms(100MHz~150MHz)
13.General
Power Source
Operation
Environment
Storage temperature
& Humidity
AC115V, 230V±15%,50/60Hz AC115V, 230V±15％,50/60Hz
Indoor use, altitude up to 2000m.
Ambient T emperature 0℃ to 40℃.
Relative Humidity 80%(Maximum).
Installation category II
Pollution Degree 2
-10℃ to 70℃.
70% (Maximum).
GFG-
GFG-
8215A/8216A/8217A/8219A
Accessories
Dimension
Weigh
Measurement category I is for measurements performed on circuits not
directly connected to MAINS.
Measurement category II is for measurements performed on circuits directly
connected to the low voltage installation.
Measurement category III is for measurements performed in the building
installation.
Measurement category IV is for measurements performed at the source of
the low-voltage installation
GTL-101×2
*GTL-101×1 for GFG-8215A
Instruction manual×1
251(W)×91(H)×291(D) m/m 251(W)×91(H)×291(D) m/m
Approx. 2.0kgs-GFG-8215A
2.1kgs-GFG-8216A
2.15kgs-GFG-8217A
2.2kgs-GFG-8219A
.
GTL-101×2
Instruction manual×1
Approx. 2.3kgs-GFG-8250A
2.4kgs-GFG-8255A
GFG-
8250A/8255A
WARNING ： To avoid electrical shock, the power cord
protective grounding conductor must be connec ted to ground.
CAUTION：To avoid damaging the instrument, do not use it
In a place where ambient temperature exceeds 40℃.
CAUTION：To avoid damaging the in strument, do not input
more than DC15V to V.C.F.(V.C.G.).
CAUTION：To avoid damaging the in strument, do not input
more than AC150V to Frequency Counter (for GFG-8216A,
GFG-8217A, GFG-8219A, GFG-8250A, and GFG-8255A).
CAUTION：To avoid damaging the in strument, do not input
more than AC10Vpp when proceed EXT modulation
operation (for GFG-8219A, GFG-8255A).
9
10
FUNCTION GENERATOR-SERIES
INSTRUCTION MANUAL
z Fig 4.1 FRONT PANEL
FUNCTION GENERATOR-SERIES
INSTRUCTION MANUAL
z Fig.4-2 REAR PANEL
11
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FUNCTION GENERATOR-SERIES
f
INSTRUCTION MANUAL
FUNCTION GENERATOR-SERIES
INSTRUCTION MANUAL
4. FUNCTION DESCRIPTION
1. Power Switch Connect the AC power, then pres s power switch.
2. Gate T ime
Indicator
2a. Gate Time
Selector
3. Over Indicator In the external counter mode, the indicator is
4. Counter Display Shows the external frequency by 6 × 0.3" green
5. Frequency
Indicator
6. Gate T ime
Indicator
7. Frequency Range
Selector
Press the power switch, Gate time indicator will start
to flash (the gate time of internal counter is 0.01
second).
Press this key to change gate time when use external
counter mode. The change order is according to 0.01s,
0.1s, 1s, 10s cycle by pressing these keys.
illuminated when the output frequency is greater than
the range selected.
display, and shows the internal frequency by 5 × 0.3
green display.
Indicate the current frequency value.
Indicate the current Gate time (external. counter mode
use only).
To select the required frequency range b y pressing the
relevant push button on the panel as shown in
T abl e 1 an d Table 2.
Table 1(for GFG-8215A/8216A/8217A/8219A)
Push bottom 1 10 100 1k 10k 100k 1M
Frequency Range
0.3Hz
∣
3Hz
3Hz
∣
30Hz
30Hz
∣
300Hz
300Hz
∣
3kHz
3kHz
∣
30kHz
30kHz
∣
300kHz
300kHz
∣
3MHz
Table 2(for GFG-8250A/8255A)
Push bottom 1 10 100 1k 10k 100k 1M
Frequency Range
0.5Hz
∣
5Hz
5Hz
∣
50Hz
50Hz
∣
500Hz
500Hz
∣
5kHz
5kHz
∣
50kHz
50kHz
∣
500kHz
500kHz
∣
5MHz
8. Function Selector Press one of the three push buttons to select the desired
output waveform.
9. Duty Function Pull out and rotate the knob to adjust the duty cycle o
the waveform.
10. TTL/CMOS Selector
When push in the knob, the BNC terminal of
output a TTL compatible waveform. If pull out and
rotate the knob can adjust the CMOS compatible output
(5-15Vpp) from the output of BNC
20
.
11. DC Offset Control Pull out the knob to select any DC level of the
waveform between ± 10V, turn clockwise to set a
positive DC level waveform and invert for a negative
DC level waveform.
12. Output Amplitude
Control with
Attenuation
Turn clockwis e fo r MAX. output and invert f or a –20dB
output. Pull the knob out for an additional 20dB output
attenuation.
Operation
20
will
13
14
FUNCTION GENERATOR-SERIES
f
INSTRUCTION MANUAL
FUNCTION GENERATOR-SERIES
INSTRUCTION MANUAL
12a. 20dB At t e n uat i o n Press the knob to adjust a –20dB output.
13 MANU/SWEEP
Selector and
Frequency
Adjustment
(Sweep On/Off)
Press and turn clockwise the knob for MAX frequency
and invert for MIN frequency. (Keep the pointer within
the scale range on the panel.).
Pull out the knob to start the auto sweep operation; the
upper frequency limit is determined by the knob
position.
14 Sweep Time
Control and
LIN/LOG
Selector
(1) Rotate the knob clockwise to adjust sweep time for
MAX, or invert for MIN.
(2) To proceed Linear sweep mode by pushing in the
knob, or select LOG sweep mode by pulling out the
knob.
15. Control MOD
ON/OFF Selector
16. Sweep Width &
Modulation
Carrier &AM/FM
Selector &FM
Selector
17 INT/EXT MOD
Selector
Pull out the knob, the output can be modulated by
internal 400Hz Sine wave or an external signal via
21
VCF/MOD in connector
.
(1) Sweep width can be controll e d f rom 0 to 1000 times.
(2) To adjust modulation ratio by turning the knob
clockwise for MAX, or in vert for MIN.
(3) Press the knob to get AM function or pull it out for
FM function.
When press the button once, the indicator will lighten,
then the EXT MOD has been selected. Press the key
again, the indicator will be off, then INT MOD has been
selected.
18. INT/EXT Counter
Selector
Select internal counter mode (count the frequency o
model) or select EXT counter mode for an independent
counter (input signal from BNC
19
).
19. EXT. Counter
Accepts external signals for measurement.
Input T erminal
20. TTL/CMOS
TTL/CMOS compatible signal output
Output T erm inal
21. VCF/MOD
Input T erminal
Used to connect the input voltage required to perform
the “voltage control frequency” operation or the EXT
modulation operation.
22. Main Output
Main signal output.
Terminal
23. GCV Output This is DC voltage output and its voltage amount will
follow the change of Frequency.
24. Power Switch 115V and 230V selectable.
z Remark:
(1) The functions of item 2, 2a, 3, 4, 5, 6, 14, 15, 16, 17, 19 and 23 can
not be applied to model GFG-8215A.
(2) The functions of item 14, 15, 16, 17 and 23 can not be applied to
GFG-8216A, and GFG-8250A.
(3) The function of item 15, 16-2, 16-3, 17 and 23 can no t be applied to
GFG-8217A.
(4) The function of item 20 for GFG-8216A/8250A can be selected
from front panel.
(5) The function of item 20 and 21 for GFG-8215A can be selected
from front panel.
15
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FUNCTION GENERATOR-SERIES
INSTRUCTION MANUAL
FUNCTION GENERATOR-SERIES
INSTRUCTION MANUAL
5. USAGE DESCRIPTION
These function generators can provide versatile waveforms of high
efficiency and convenient operation. Familiarize yourselves with these
functions thoroughly through Operation Manual and practice with all
accurate operation procedures can lead you to easily master the performance
of these Function Generat o rs.
It is one of the best ways to observe waveforms by connecting the
instruments to Oscilloscope. Watch the effect in different control of
waveforms through Oscilloscope carefully when proceeding the following
steps:
5-1.First-step check:
(1) Ensure that the voltage of the main supply is compatible with this
instrument. The label on the rear panel states the required AC
voltage.
(2) Connect the instrument to the main supply using the power cord
supplied.
(3) Press PWR switch
then rotate AMPL
(4) Rotate the FREQ
1
and ensure all the rotary co ntro ls ar e push ed in,
12
knob to make the indi cat i on p oi nt up forward.
13
control fully anticlockwise.
5-2.Triangle, square and sine wave
(1) First select Function
8
, and select Range
set the required frequency.(read out from display window).
(2) At this moment, connect Output
22
, to oscilloscope for observing
output signal, or connect to other experiment ci rcui t.
(3) Rotate AMPL
12
again to control wavef o rm amplitude.
(4) If attenuation output signal is required, pull out AMPL
obtain 20dB attenuation or press (12a) knob for additional 20dB
attenuation.
(5) The phase-relation of Output Waveform shown in Figure 1 as below:
z Figure 1.
7
, rotate FREQ 13 , to
12
knob to
17
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FUNCTION GENERATOR-SERIES
INSTRUCTION MANUAL
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INSTRUCTION MANUAL
5-3.Pulse wave generation
(1) First press the key ( ) of Function
and rotate FREQ
(2) Connect output-terminal
13
, to set required frequency range.
22
to oscilloscope for observing output
signal.
(3) Pull out and rotate Duty k to adjust the width of pulse waveform.
(4) Adjust AMPL
(5) Pull out AMPL
12
knob to control pulse amplitude.
12
knob to get 20dB attenuation of out p ut.
8
; then select Range
5-4.Ramp wave generation
(1) First press the key ( ) of Function
rotate FEEQ
(2) Connect output-terminal
13
switch to set required frequency ra n ge.
22
to oscilloscope for observing output
signal.
(3) Pull out and rotate DUTYk to adjust the slope of ramp waveform.
(4) Adjust AMPL
12
knob to control output amplitude of ramp
waveform.
(5) Pull out AMPL
12
knob to obtain 20dB attenuation of o utput .
8
, then select Range
5-5.TTL/CMOS signal output
(1) First select Range 7, rotate FREQ 13 to set required frequency
range.
(2) Connect BNC connector of TTL/CMOS
experiment circuit for observing out put sig nal.
(3) At this moment, output is square waveform fixing to TTL level; suits
for general TTL integrated circuit.
(4) If square waveform of CMOS level is required, can pull out CMOS
10
knob to adjust voltage level.
20
to oscilloscope or to other
5-6.Variation of external voltage-controlled frequency
7
,
7
,
This mode of operation allows the user to adjust the frequency of the
function generator with an external DC control Voltage. It also provides
an easy way for your adjustment.
(1) Select Function
8
first, then select Range 7, rotate FREQ 13 to
set required frequency range.
22
21
.
connector
(2) Connect external control voltage (0 ~ 10V) to the VCF
via a suitable lead, and generate signal from Output
(3) Other adjustments, such as AMPL
signal, or get attenuation; adjust Offset
12
switch can change amplitude of
11
for DC level, rotate Duty k
switch can change output signal of pulse or ram p wavef orm etc.
5-7.Auto Sweep
(1) First select the required waveform by pressing Function 8 button,
then select required frequency range by pressing range
7
push
button.
(2) Connect output terminal
22
to oscilloscope for observing output
signal.
(3) Rotate frequency
(4) Pull out frequency
(5) Rotate SWEEP/TIME
13
to determine the upper limit frequency.
13
to perform auto-sweep operatio n.
14
and SWEEP/RATE 16 to adjust sweep
time and rate.
(6) Pull out (press) LIN/LOG
14
to obtain LOG (LIN) sweep mode.
Note: The sweep width can only be adjusted during the
sweep cycle and it can not be stopped.
19
20
FUNCTION GENERATOR-SERIES
INSTRUCTION MANUAL
5-8.AM/FM operation
(1) Select function 8 first; then select Range 7, rotate FREQ 13 to set
required frequency range.
(2) Connect output terminal
22
to oscilloscope for observing output
signal.
(3) Press MOD
15
and pull out (press) MOD 16 to obtain FM/AM
modulation mode.
(4) Adjust MOD
16
to achieve required modulation ratio.
5-9. Precaution item
(1) Adjust DC OFFSET, will provide to change voltage of ±10V (no load)
or ± 5V (50Ω load). However, signal added DC level, is still
limited to ±20V (no load) or ± 10V (50Ω load). In case of overvoltage, clip will appear as shown in Figure 2:
(2) Output connector label 50Ω, indicated that signal source impedance is
50Ω. Connect to any of impedance circuit, but output voltage and
terminal impedance will be rated. To avoid oscillation, terminal shall
be connected to 50Ω (When using high frequency and square output),
and its connecting line shall be as short as possible.
(3) When adjust Duty knob to leftward position, the ratio of positive state
to negative state, expand to not less than 80:20. It can expand Square
wave to Pulse wave, expand Triangle wave to Ramp wave and Sine
wave to unsymmetrical Sine wave. As shown in Figure 3 is for
adjustment of Duty control to obtain required waveform.
FUNCTION GENERATOR-SERIES
INSTRUCTION MANUAL
z Figure 2.
z Figure 3.
21
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FUNCTION GENERATOR-SERIES
INSTRUCTION MANUAL
6. APPLICA TION NOTE
This section describes the application of the Function Generators in
details as well as a brief description relating to the block diagram. Only for
the essential application method.
(A) T r ou bl e-shooting using signal -t racing method.
This method is similar to signal replacing way. The signal of model
will be fixedly sent to input terminal. Observing its signal wave on the
oscilloscope from front stage to rear stage orderly until appear a signal
with normal input but with abnormal output.
(B) Use as bias source and signal source circuit.
Utilize the Figure 4 of connecting type, which can provide bias of a
transistor and signal input. The output waveform can be observed from
oscilloscope. Adjust to the best cond ition with output max. amplitude
and no distortion. Adjust DC OFFSET to see the different effect of
different bias condition.
(C) Amplifier over-load characteristics
The Sine wave input will be different from output the overload point.
Using Triangle wave will easily observe the display of oscilloscope. It
can decide the linear range of output waveform. And the largest nodistortion output amplitude.
FUNCTION GENERATOR-SERIES
INSTRUCTION MANUAL
(D) Using the Square wave test the characteristics of amplifier circuit.
It can’t actually explain the transient response of amplifier by using
Sine wave for the frequency response curve observation, but using the
high order poly-wave, Square wave, instead to display its waveform
from the oscilloscope can show up many characteristics of amplifier.
(a) Using the circuit of figure 5, the 50 Ω connector trim the
oscillation effect of Square wave.
(b) Use the output of Triangle wave, adjust the amplitude until there
are no clipping happened i n t he applied frequency.
(c) Select Square wave, adjust frequency, choose to watch the wave-
form of middle of amplifier pass band, like 20Hz, 1kHz, 10kHz
and etc.
(d) The output waveform of (c), must get something with frequency
Figure 6 shows some possible conditions.
CAUTION: The composed poly-wave frequency of
Square wave is quite large, so it’s not suitable for the
narrow band amplifier testing.
(E) Test of logic circui t
This equipment is suitable for logic circuit testing. Using Square or
Pulse wave can analyze or watch the frequency waveform of a
designed testing circuit. Also the DC Offset effect, drive the plug-in
model board or logic circuit trouble-shooting and etc. Used as sign al
tracing and signal replacing operation:
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FUNCTION GENERATOR-SERIES
INSTRUCTION MANUAL
FUNCTION GENERATOR-SERIES
INSTRUCTION MANUAL
(a) Connect the lines as Figure 7.
(b) According to the operation guide in this manual, set Square wave or
Pulse wave output.
(c) Use the label TTL, CMOS output terminal testing TTL logic circuit.
(d) To test CMOS circuit by pulling up the switch of TTL/CMOS, and
adjust CMOS level by rotating the switch to set the proper level
(e) Use dual-trace scope to show the input-output timing relation
judged by the two waves shown in Figure 4.
(F)Testing of speaking and i mpedance network
This equipment can be used to test the frequency characteristics of
speaker or any impedance network. It also can get the resonant
frequency of network.
(a) Connect the device under test as in Figure 8, can use oscillo scop e in
stead of voltmeter.
(b) When use voltmeter, adjust the frequency of instrument record
down voltage relative to frequency.
(c) When testing speaker, if there is a peak volt value, when in low
freq., this must be the resonant freq. of this speaker, see Figure 10.
Whether installation may cause any effect to this frequency or not?
The proper design of case-installation will cause two small ramps
on both sides of this sharp ramp.
(d) In testing other impedance network, the resonant may not occur in
low frequency. But in approaching the resonant frequency, there
are still increasing in voltage, then the impedance can be tested as
following:
(1) Series connect a R1 to the network under test as in Figure 9.
(2) Get voltage read out in E1, E2 , adjust R1 until E2 is equal to one
half of E1.
(3) Under this frequency, the impedance network is the same as the
R1.
(G)Act as automatic test of speaker
Because there provide the auto feature in this equipment, the output can
drive to amplifier for testing the frequency response of speaker.
(a) Set Auto/Manual to Auto position.
(b) Set function to Sine wave
(c) Set Range to 20kHz
(d) Sweep mode (LIN, LOG), sweep width, sweep time can be set in
any value.
(e) The line connected is showed in Figure 11.
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z FIGURE 4
z FIGURE 5
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z FIGURE 6
FUNCTION GENERATOR-SERIES
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z FIGURE 7
z FIGURE 8
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FUNCTION GENERATOR-SERIES
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z FIGURE 9
z FIGURE 10
z FIGURE 11
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7. MAINTENANCE
The following instructions are used by qualified person only to avoid
electrical shock, do not perform any service other than contained in the
operation instructions unless you are qualified to do so.
FUNCTION GENERATOR-SERIES
INSTRUCTION MANUAL
7-2.Fuse Replacement Procedure
When you proceed calibration or maintenance of the Function
Generators, if you want to replace the fuse, the upper cover must be removed
according to the following steps:
7-1.Fuse Rating and type
If the fuse blows, the FUNCTION GENERATOR will not operate. Try
to determine and correct the cause of the blown fuse, then replace the fuse
with correct rating and ty pe shown as below:
MODEL
GFG-8215A T0.315A 250V T0.16A 250V 22 28
GFG-8216A T0.315A 250V T0.16A 250V 25 32
GFG-8217A T0.315A 250V T0.16A 250V 27 34
GFG-8219A T0.315A 250V T0.16A 250V 29 36
GFG-8250A T0.315A 250V T0.16A 250V 25 32
GFG-8255A T0.315A 250V T0.16A 250V 29 36
WARNING: For continued fire protection, replace only
with 250V fuse of the specified type and rating, and
disconnect the power cord before proceeding fuse
replacement.
FUSE Rating and Type Rating Input
115V 230V Watts VA
1).The handle must be tu rned downward 90 degree s fi rst .
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FUNCTION GENERATOR-SERIES
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2).Pull apart the handle from the Function Generator. Please turn the
handle left and right side slightly, that will make easier to pull off the
handle.
3).There are two washers inside of two holes (the joints of handle and case)
respectively. Please use a screwdriver to pry open these washers.
4).Please use a screwdriver to open the screw located at upper side of rear
panel. Therefore, the upper cove r can pull toward the backside. In the
meantime, the upper cover is moved.
Note: If you want to install the up per cover, please reverse above steps.
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7-3. Cleaning
To keep the instrument clean, wipe the case with a damp cloth and
detergent. Do not use abrasives o r solvents .
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