GW Instek GOS-620FG User manual

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20MHzDual TraceOscilloscope
with Function Generator
MODEL: GOS-620FG
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CONTENTS PAGE
............................................................................................... 1 . PRODUCT INTRODUCTION
1-1.Description ................................................................................................................
1-2.Feature ......................................................................................................................
....................................................................
2 . TECHNICAL SPECIFICATION
......................................................... 3 . PRECAUTIONS BEFORE OPERATION
...............................................................................................
3-1.Unpacking the instrument
.............................................................................................. 3-2.Checking the Line Voltage
3-3.Environment
...............................................................................................................
3-4.Equipment Installation and Operation ...............................................................................
3-5.CRT Intensity ..............................................................................................................
3-6.Withstanding Voltage of Input Terminals ...........................................................................
4 . PANEL INTRODUCTION ..........................................................................
4.1.Front Panel .................................................................................................................
4-2.Rear Panel ..................................................................................................................
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CONTENTS PAGE
OPERATION METHOD
.............................................................................. 17
S.1.Basic Operation ............................................................................................................ 17
................................................................................................. 5.2.Dual.channel Operation 19
5.3.ADD Operation
............................................................................................................ 20
5.4.Triggering
.................................................................................................................. 22
5.S.TIM EIDIV Control
....................................................................................................... 23
5.6.Sweep Magnification
..................................................................................................... 23
5.7.X.Y Operation
............................................................................................................ 24
5.8.Calibration
................................................................................................................. 25
5.9.DC BALAdjustment
..................................................................................................... 25
5.IO.Function Generator
..................................................................................................... 25
MAINTENANCE ..................................................................................... 26
6.1.Fuse Replacement ........................................................................................................ 26
6.2.Line Voltage
............................................................................................................... 26
6.3.Cleaning
.................................................................................................................. 27
BLOCK DIAGRAM ................................................................................... 28
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SAFETY TERMS AND SYMBOLS
Theseterms may appear inthis manual or on the product:
WARNING. Warning statements identify condition or practicesthat
could result ininjury or lossof life.
CAUTION. Caution statements identify conditions or practices that
could result indamage to this productor other property.
The following symbols may appear inthis manualor on the product:
DANGER ATTENTION Protective Frameorchassis
HighVoltage refer to Manual Conductor Terminal
Terminal
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FOR UNITED KINGDOM ONLY
NOTE
This leadlappliance 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:
Green1
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 plugiappliance, proceed as follows:
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 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 andlor user instructions for
details. As a guide, cable of 0.75mmz should be protected by a 3A or 5A hse. 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 hse
& fuse carrier and disposed 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.
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EC Declaration of Conformity
We
GOOD WILL INSTRUMENT CO.,LTD.
(1) NO. 95 - I I, Pao Chung Rd., Hsin-Tien City, Taipei Hsien, Taiwan
(2) Plot 522, Lorong Perusahaan Baru 3, Prai Industrial Estate, 13600 Prai, Penang, Malaysia
declare, that the below mentioned product
GOS-620FG
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,92/3 l/E~C,93168/EEC)and Low Voltage
Equipment ~irective(73/231E~C).
For the evaluation regarding the Electromagnetic Compatibility and Low Voltage
Equipment
Directive, the following standards were applied:
EN50081-2: Electromagneticcompatibility -
(1993) Genericemission standard I Low Voltage Equipment Directive 73/23/EEC I
Part 2: industrial Environment
Conducted Emission
EN 5501 1 class B Low Voltage Directive EN 61010-1 : (1993)+A2:(1995)
Radiated Emiss~on (1991) I
I
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1. PRODUCT INTRODUCTION
1.1 Description
The GOS-620FG oscilloscope + Function Generator is a portable-type, dual-channel oscilloscope with function generator.
Its bandwidth of DC is up to 20MHz, and its maximum sensitivity is ImVIDIV. The time base provides a maximum
sweep time of 0.2uSIDIV. The sweep speed becomes 100nSIDIV after magnifying 10 times. The oscilloscope uses a
6-inch rectangular type cathode-ray tube with red internal graticule. The Function Generator generates triangle wave, sine
wave, and square wave with the frequency range from 0.1Hz to IMHz.
The product is sturdy, easy to operate and exhibits high operational reliability.
1.2Features
1)High intensity CRT with high acceleration voltage:
The CRT is a high beam transmission and high intensity type with
a high acceleration voltage of 2kV. It displays readable
traces clearly even at high sweep speeds.
2) Wide bandwidth and sensitivity:
In addition to wide bandwidth, DC-20MHz (-3dB), the instrument provides high sensitivity of 5mVIDIV (ImVIDIV at
X 5 MAG). A 20MHz frequency is obtained with improved triggering synchronization.
3) Alternate triggering:
Even with an observation of two different frequency waveforms, each waveform can be triggered stably
4) TV sync triggering:
The oscilloscope has a sync separator circuit for TV-V and TV-H signals triggering.
5)CHI Output:
A signal from 50Q output terminal of CHI located on rear panel can be applied to frequency counteror other instruments.
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6) Z-Axis Input:
Intensity modulation capability permits time or frequency markers to be added. Trace blank with positive signal, TTL
compatible.
7) X-Y operation:
Set the switch to X-Y to operate the instrument as an X-Y oscilloscope. CHI can be applied as a horizontal deflection (X-axis)
while
CH2 provides vertical deflection (Y-axis).
8) Built-in Function Generator with BNC output of 50 '2.
9) Three kinds of waveforms are available with 50R output.
10)Waveform frequency
is up to I MHz.
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PECIFICATIONS
GOS-620FG20MHz OSCILLOSCOPE + FUNCTION GENERATOR
,OSCILLOSCOPE
lsensitivitv 15m~ - 5VIDIV. 10stem in 1-2-5 seauence
- -~~- - ~
Sensitivity Accuracy 53%
( x 5 MAG : 55%).
Vernier Vertical sensitivity To 112.5or less of panel-indicated value.
DC-20MHz
( x 5MAG: DC-7MHz).
'ERTICAL
AXIS
Frequency bandwidth AC coupling: Low limit frequency of 10Hz.
(With reference to IOOkHz, 8DIV. Frequency response at -3dB).
Rise time Approx. 17.5nS(x5 MAG: Approx. 50nS).
Input impedance Approx. 1M ohm 11 Approx. 25pF.
SquareWave Overshoot
: 5 5% ( At IOmVIDIV range).
Characteristics Other distortions and other ranges: 5% added to the above value.
DC Balance Shift Panel adjustable.
Linearity <iO.lDIV of amplitude change when waveform of 2 DIV at graticule center is moved vertically.
CHI
: CHI single channel.
CH2
: CH2 single channel.
Vertical modes DUAL
: CHI and CH2 are displayed. ALT or CHOP selectable at any sweep rate.
ADD
: CHI + CH2 algebraic addition.
Approx, 2jOkHHz,
Frequency
Input Coupling AC, GND, DC.
300Vpeak (AC: frequency IkHz or lower).
. .
Maximum Input Voltage Set probe switch at
1: 1, the maximum effective readout is 4Wpp(14Vrms at Sine wave).
set probe switch at
10: 1, the maximum effective readout is 400Vpp(140Vrms at Sine wave).
common Mode
50:l br better at 56wzsinusoidal wave. (When sensitivities of CHI and CH2 are set equally).
Ratio
Isolation between channels >1000:
1
at 50kHz.
(At 5mVIDIV range) >30:
1 at 20MHz.
CHI signal output At least 20 mvldiv into a 50Rterminal. Bandwidth is 50Hz to 5MHz at least.
CH2 TNV BAL. Balanced point variation: 51 DIV (Reference at center graticule).
-3-
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'ECIFICATIONS
GOS-620FG 20MHz OSCILLOSOPE + FUNCTION GENERATOR
I
CHI, CH2, LINE, EXT (CHI and CH2 can be selected only in the DUAL or ADD vertical mode).
/Triggering source
I
In ALT mode, if the TRIG. ALT switch is pushed in, it can alternate triggering of two different
source.
Coupling
IAC: 20Hz to full bandwidth.
Slope
I+ I -.
120~~ -- 2MHz : 0.5 DIV, TRIG-ALT:2 DIV, EXT : 200mV.
J~ensitivity 12
-- 20MHz
: 1.5DIV, TRIG-ALT:3 DIV, EXT : 8OOrnV.
ITV : Sync pulse more than 1DIV (EXT: 1V).
'RIGGERING Triggering modes
AUTO : Sweeps run in the free mode when no triggering input signal is applied.
(Applicable for repetitive signals of frequency 25Hz or over.).
NORM
: When no triggering signal is applied, the trace is in the ready state, but not displayed.
TV-V
: This setting is used when observing the entire vertical picture of television signal.
TV-H
: This setting is used when observing the entire horizontal picture of television signal.
(Both TV-V and TV-H synchronize only when the synchronizing signal is negative
)
EXT Triggering Signal Input
Input Impedance Approx.: 1
M ohm I/ approx. 25Pf.
Max. Input Voltage 300V (DC+AC peak), AC: Frequency not higher than
I kHz.
Sweep Time 0.2,~Sec - 0.5 Sec/DIV, 20 steps in 1-2-5sequence.
Sweep Time Accuracy
1- 3%.
Vernier SweepTime Control _<1/2.5of panel-indicated value.
IORIZIONAL
Sweep Magnification 10times (maximum sweep time 100nSec/DIV).
AXIS
xlOMAG Sweep Time
4 59'0,(20nSec- 5OnSec are uncalibrated).
Accuracv
Linearity ?3%, xlOMAG:+5% (20ns and 50ns are uncalibrated).
Position shift caused by
x 1 OMAG
Within 2 div, at CRT screen center.
. - - - - . - - -
Sensitivity Same
as vertical axis (X-axis:CHl input signal; Y-axis:CH2 input signal.).
LY MODE Frequency Bandwidth DC to at least 500kHz.
-
Ix-Y Phase Difference
ID' at DC -50kHz.
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SPECIFICATION
/sensitivity
l~re~uencyBandwidth
GOS-620FG 20MHz OSCILLOSCOPE
+ FUNCTION GENERATOR
5 Vp-p (Positive-going signal decreases intensity).
DC
- 2MHz.
Z AXIS
CALIBRATION
VOLTAGE
2.FUNCTION GENERATOR
Output Function Range
10 1 Hz - 1 MHz (7 steps)
Output Waveform
l~ineWave. Square Wave and Triangle Wabe
CRT
IFreauencv Variable Range
110:1 or more. I
Input resistance
Maximum lnput Voltage
Waveform
Frequency
Duty Ratio
Output Voltage
Approx. 47KR.
30V
(DC+AC peak, AC frequency51kHz).
Positive-going Square wave.
Approx. 1kHz.
Within 48:52.
2 Vp-p
i2%.
Output Impedance
Type
Phosphor
Acceleration Voltage
Effective Screen Size
Graticule
Trace Rotation
Square wave Unsymmetry (t3% or less (~n I kHz maximum)
Souare wave RiselFall Time
150R outuut 120n~or less
. .
Approx. I kR
6-inch rectangular type. internal graticule.
P
31.
Approx. 2kV.
8 x 10 DIV (I DIV = lOmm (0.39in)).
Internal.
Provided.
50R
i 10%.
Output Voltage
Wcuit)continuous conversion.
DC offset possible over * 10V when opened.
1% MaxiloHz - 20kHz)
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Power Source
SPECIFICATION
Power Consumption
Operation Environment
GOS-620FG 20MHz OSCILLOSCOPE + FUNCTION GENERATOR
Storage Temperature & Humidity
3.GENERAL
Accessories
Dimensions
Weight
4C115V, 230V k 15%selectable, 50Hz or 6OHz.
4pprox. 45VA, 40W(max.)
Indoor use
Altitude up to 2000
m
Ambient temperature :
To satisfy specifications : 10" to 35°C(50' to 95" F)
Maximum operating ranges: 0" to 40°C(32'to 104" F)
Relative humidity: 85%RH(max.) non condensing
Installation Category
I1
Pollution degree 2
- 10" to 70°C. 70%RH(maximum).
'ower cord
X l
nstruction manual X l
'robes
X 2
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3. PRECAUTIONS BEFORE OPERATION
3.1 Unpacking the instrument
The product has been fully inspected and tested before shipping from the factory. Upon receiving the instrument, please
unpack and inspect it to check if there is any damages caused during transportation.
If any sign of damage is found, notify
the bearer andor the dealer immediately.
3.2 Checking the Line Voltage
The product can be applied any kind of the line voltage shown in the table below. Before connecting the power plug to an
AC line outlet, make sure the voltage selector of the rear panel is set to the correct position corresponding to the line voltage.
It might be damaged the instrument if connected to the wrong
AC line voltage.
A
WARNING. To avoid electrical shock, the power cord protective grounding conductor must be
/ ! \
connected to ground.
The fuse must be changed following after the line voltage shown as below:
T 0.63A
AC
1 15V 97-1 32V
T 0.315A
AC 230V 195-250V
A WARNING. Toavoid personal injury, disconnect the power cord before removing the fuse holder.
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0
CNSURE THE POWER IS REMOVED FROM
IHE INSTRUMENT BEFORE REPMCING THE FUSE
POWER
MAX 40 WAIlS, 45VA
IEClDlO 25W CAT I1
I I
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4-1.Front Panel
CRT :
(6) POWER
Main power switch of the instrument. Turn on the switch to light the LED
(5).
(2).INTEN
Control the brightness of the spot or trace.
(3) FOCUS
Focus the trace to the sharpest image.
(4) TRACE ROTATION
Semi-fix potentiometer for aligning the horizontal trace in parallel with graticule lines.
(33)FILTER
The filter is easy for waveform viewing.
Vertical Axis:
(8) CH 1 (X) input
The vertical input terminal of CH 1 is X-axis in X-Y operation,
(20)CH 2 (Y) input
The vertical input terminal of CH2 is Y-axis in X-Y operation,
(1 0) &(I 8)AC-GND-DC
Select connection mode between input signal and vertical amplifier.
AC AC coupling
GND Vertical amplifier input is grounded and input terminals are disconnected.
DC DC coupling
(7) & (22)VOLTSlDIV
Select the vertical axis sensitivity from SmVIDIV to SVJDIV with 10ranges totally.
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(9) & (21)VARIABLE
Fine adjustment of sensitivity with a factor of 2112.5 of the indicated value. The sensitivity is calibrated to specific
value in the CAL position. When this knob is pulled out (x5 MAG state), it will multiply 5 by the amplifier sensitivity.
(13) & (17)CHl & CH2 DC BAL.
The knobs are used for adjusting the attenuator balance. Seepage 20 DC BAL adjustments for details.
(I
I)&(]
9) * ' POSITION
Vertical positioning control of trace or spot.
(I4)VERT MODE Select operation modes of CH 1and CH 2 amplifiers.
CH I
Operate the oscilloscope as a single-channel instrument by selecting CHI alone.
CH
2
Operate the oscilloscope as a single-channel instrument by selecting CH2 alone.
DUAL Operate the oscilloscope as a dual-channel instrument by selecting CHI and CH2.
ADD The oscilloscope displays the algebraic sum (CHI
+ CH2) or subtraction (CHI - CH2) ofthe two signals
(the subtraction function effects only when push in CH2 INV(16) button).
(12)ALTICHOP
When this switch is released in the dual-trace mode, the CHI and CH2 inputs are alternately displayed (normally used at
faster sweep speeds).
When this switch is depressed in the dual-trace mode, the CHI and CH2 inputs are chopped and displayed
simultaneously. (normally used at slower sweep speeds).
(16)CH2 INV
When press CH2 MV button, it will inverts the CH2 input signal in CH2 and in ADD MODE, the CH2 trigger signal
pickoff is also inverted.
(23)SOURCE
Select the internal triggering source signal, and the EXT TRIG
IN input signal.
CH 1 Press key DUAL or ADD of VERT MODE (14), select CHI to get internal triggering source signal
CH 2 Press key DUAL or ADD of VERT MODE (14), select CH2 to get internal triggering source signal
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(27)TRIG.ALT
Set VERT MODE switch (14) in DUAL or ADD key, select the SOURCE switch (23) by pressing CHI or CH2, then
press TRIG.ALT switch(27), the internal triggering source signal will display alternately from CHI and CH2.
LINE Displaythe triggering signal from
AC power line frequency signal.
EXT Obtain the external triggering source signal by applying external signal to EXT TRIG
IN input terminal (24).
(26)SLOPE
Triggering slope button.
"+"
Triggering occurs when the trigger signal crosses the trigger level by positive-going course.
'6- *7
Triggering occurs when the trigger signal crosses the trigger level by negative-going course
(28)LEVEL
Display a synchronized stationary waveform and set a start point for the waveform.
Toward
"+" The trigger level moves upward onthe display waveform.
Toward
"-" The trigger level moves downward on the display waveform.
(25)TRIGGER MODE
Trigger mode selection.
AUTO
If no trigger signal applied or the trigger signal frequency is less than 25Hz, the sweep will be in the free run
mode.
NORM
If no trigger signal applied and sweep is in a stand-by state, there will be no trace appear.
TV-V Used for observing entire vertical picture of television signal.
TV-H Used for observing entire horizontal picture of television signal.
(Both TV-V and TV-H synchronize only when the synchronizing signal is negative.)
Time Base:
(29)TIME/DIV
Provide sweeptime ranges @om0.2 uS/div to 0.5 Sldiv with 20 steps totally.
X-Y Use the instrument as an X-Y oscilloscope by setting to X-Y position.
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(30)sWP.VAR
Vernier control knob of the sweep time used when CAL and the sweep time is calibrated to the vh!ue preset in
TIMEDIV. The sweep of TIMEBIV can be varied continuously when shaft is not in CAL position. Rotate the control
knob to CAL position and the sweeptime is calibrated to the preset value of the TIMEDIV. Counterclockwise rotate the
control knob to the bottom to delay the sweep by
2.5 time or more.
(32) POSITION
Adjust the trace or spot in horizontal position.
(31)X
10 MAG
Magnify 10by pressing this key.
Function Generator:
(39)GENERATOR OUTPUT
The main output terminal with 50
R output impedance.
(40)WAVEFORM SELECTOR
The waveform change followingafter each button pushing in Sine wave, Triangle wave, and Square wave sequence.
(4
1 )OUTPUT WAVEFORM DISPLAY
Display the current output waveform.
(42)FREQ RANGE Switch:
The frequency range changes following after each button pushing in
lM, look, 10k, 1 k, 100, 10, and 1 sequence.
(43)FREQUENCY
RANGE DISPLAY
Display the current frequency range.
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(44)FREQUENCY Knob
Rotate the knob clockwise to get higher frequency and reverse the rotation of knob to get lower frequency.
(45)AMPLITUDEIDC LEVEL Adjustment Knob
Rotate outside knob clockwise to get higher amplitude and reverse the rotation of knob to get lower amplitude. The
inside knob is for DC Level adjustment, it works only when the knob being pulled
up. Pull up the knob and rotate it
clockwise to get positive DC Level, and reverse the rotation of knob to get negative DC Level.
Others:
(1) CAL
This terminal delivers the calibration voltage of 2 Vp-p,
I kHz, positive square wave.
(1 5)GND
Ground terminal of oscilloscope mainframe.
4-2.Rear Panel
Triggering:
(24)EXT TRlG IN Input Terminal
lnput Terminal is used for external triggering signal by setting SOURCE switch
(23) to the EXT position.
(34)Z AXIS INPUT
Input terminal for external intensity modulation signal.
(35)CH
1 SIGNAL OUTPUT
Delivers a voltage of approximately 20mVIDIV from the CHI signal to 50
R terminal for frequency counting.
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