Test Equipment Depot GOS-620 Instruction Manual

i 
20MHz Dual Trace Oscilloscope
Model: GOS-620
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Test Equipment Depot 99 Washington Street Melrose, MA 02176-6024

ii 
CONTENTS PAGE
1. PRODUCT INTRODUCTION........................................................................……………................................
1-1.Description………………………………………………………………………………………………….
1-2.Feature………………………………………………………………………………………………………
1
1
1
2. TECNICAL SPECIFICATION……………………………………………………………………………….. 2
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…………………………………………………………………
5
5
5
6
6
6
6
4. PANEL INTRODUCTION…………………………………………………………………………………….
4-1.Front Panel………………………………………………………………………………………………….
4-2.Rear Panel……………………………………………………………………………………………………
7
7
7
5. OPERATION METHOD………………………………………………………………………………………
5-1.Basic Operation………………………………………………………………………………………….….
5-2.Dual-channel Operation……………………………………………………………………………………
5-3.ADD Operation……………………………………………………………………………………………..
5-4.Triggering……………………………………………………………………………………………………
5-5.TIME/DIV ontrol…………………………………………………………………………………………...
5-6.Sweep Magnification………………………………………………………………………………………..
5-7.X-Y Operation………………………………………………………………………………………………
5-8.Calibration…………………………………………………………………………………………………..
5-9.DC BAL Adjustment……………………………………………………………………………………….
5-10.Function Generator………………………………………………………………………………………..
13
13
15
16
16
19
19
20
21
21
21
6. MAINTENANCE…………………………………………………………………………….............................
6-1.Fuse Replacement…………………………………………………………………………………………..
6-2.Line Voltage…………………………………………………………………………………………………
6-3.Cleaning……………………………………………………………………………………………………...
22
22
22
22
7. BLOCK DIAGRAM………………………………………………………………………................................. 23
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iii 
SAFETY TERMS AND SYMBOLS
These terms may appear in this manual or on the product:
WARNING. Warning statements identify condition or 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.
The following symbols may appear in this manual or on the product:
DANGER ATTENTION Protective Frame or chassis
High Voltage refer to Manual Conductor Terminal
Terminal
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iv 
FOR UNITED KINGDOM ONLY
NOTE As the colours of the wires in main leads may not correspond with the colours marking identified in
This lead/appliance must only your plug/appliance, proceed as follows:
be wired by competent persons
WARNING The wire which is coloured Green & Yellow must be connected to the Earth terminal marked with
THIS APPLIANCE MUST BE the letter E or by the earth symbol or coloured Green or Green & Yellow.
EARTHED The wire which is coloured Blue must be connected to the terminal which is marked with the letter
IMPORTANT N or coloured Blue or Black.
The wires in this lead are
coloured in accordance with The wire which is coloured Brown must be connected to the terminal marked with the letter L or
the following code: P or coloured Brown or Red.
Green/ If in doubt, consult the instructions provided with the equipment or contact the supplier.
Yellow: Earth
Blue: Neutral This cable/appliance should be protected by a suitably rated and approved HBC mains fuse : refer
Brown: Live(Phase) to the rating information on the equipment and/or user instructions for details. As a guide, cable
of 0.75mm ²should 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
aengaged in live socket. Any re-wiring must be carried out in accordance with the information
detailed on this label.
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v 
EC Declaration of Conformity
We
GOODWILLINSTRUMENTCO.,LTD.
(1) 4F, No. 4, Lane 235, Pao-chiao Road., Hsin-Tien City, Taipei Hsien, Taiwan
(2) Plot 522, Lorong Perusahaan Baru 3, Prai Industrial Estate, 13600 Prai, Penang, Malaysia
declare under sole responsibility that the GOS-620 meets the intent of Directive 89/336/EEC ;
92/31/EEC ; 93/68/EEC for Electromagnetic Compatibility . Compliance was demonstrated to the
following specifications as listed in the industrial Technology Research institute :
EN50081-2: Electromagnetic compatibility -
(1992) Generic emission standard
Part 1: Residential, commercial and light industry
EN50082-2: Electromagnetic compatibility -
(1992) Generic immunity standard
Part 1: Residential, commercial and light industry
Conducted Emission EN 55022 class B(1994) Electrostatic Discharge IEC 1000-4-2 (1995)
Radiated Emission EN 55011 class B(1991) Radiated Immunity IEC 1000-4-3 (1995)
Current Harmonics EN 61000-3-2 (1995) Electrical Fast Transients IEC 1000-4-4 (1995)
Voltage Fluctuations EN 61000-3-3 (1995) Surge Immunity IEC 1000-4-5 (1995)
Low Voltage Directive EN 61010-1 (1993) Voltage Dip/Interruption EN 61000-4-11 (1994)
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1 
1. PRODUCT INTRODUCTION
1.1 Description
The GOS-620 oscilloscope is a portable-type, dual-channel oscilloscope, its bandwidth of DC is up to 20MHz, and its
maximum sensitivity is 1mV/DIV. The time base provides a maximum sweep time of 0.2uS/DIV. The sweep speed
becomes 100nS/DIV after magnifying 10 times. The oscilloscope uses a 6-inch rectangular type cathode-ray tube with red
internal graticule.
The product is sturdy, easy to operate and exhibits high operational reliability.
1.2 Features
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 5mV/DIV (1mV/DIV at ×
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) CH1 Output:
A signal from 50Ωoutput terminal of CH1 located on rear panel can be applied to frequency counter or other instruments.
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. CH1 can be applied as a horizontal deflection (X-axis)
while CH2 provides vertical deflection (Y-axis).
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2 
2.TECHNICAL SPECIFICATIONS
MODEL
SPECIFICATIONS GOS-620 20MHz OSCILLOSCOPE
1.OSCILLOSCOPE
Sensitivity 5mV 〜5V/DIV, 10 steps in 1-2-5 sequence.
Sensitivity Accuracy ≤3% ( × 5 MAG : ≤5%).
Vernier Vertical sensitivity To 1/2.5 or less of panel-indicated value.
DC〜20MHz ( × 5MAG: DC〜7MHz).
Frequency bandwidth AC coupling: Low limit frequency of 10Hz.
(With reference to 100kHz, 8DIV. Frequency response at -3dB).
Rise time Approx. 17.5nS (×5 MAG: Approx. 50nS).
Input impedance Approx. 1M ohm // Approx. 25pF.
Square Wave Characteristics Overshoot : ≤5% ( At 10mV/DIV range).
Other distortions and other ranges: 5% added to the above value.
DC Balance Shift Panel adjustable.
Linearity <±0.1DIV of amplitude change when waveform of 2 DIV at graticule center is moved vertically.
Vertical modes
CH1 : CH1 single channel.
CH2 : CH2 single channel.
DUAL : CH1 and CH2 are displayed. ALT or CHOP selectable at any sweep rate.
ADD : CH1 + CH2 algebraic addition.
Chopping Repetition Frequency Approx. 250kHz.
Input Coupling AC, GND, DC.
Maximum Input Voltage
300Vpeak (AC: frequency 1kHz or lower).
Set probe switch at 1: 1, the maximum effective readout is 40Vpp (14Vrms at Sine wave),
set probe switch at 10: 1, the maximum effective readout is 400Vpp(140Vrms at Sine wave).
Common Mode Rejection Ratio 50:1 or better at 50kHz sinusoidal wave. (When sensitivities of CH1 and CH2 are set equally).
Isolation between channels
(At 5mV/DIV range)
>1000:1 at 50kHz.
>30:1 at 20MHz.
CH1 signal output At least 20 mV/DIV into a 50Ωterminal, Bandwidth is 50Hz to 5MHz at least.
VERTICAL
AXIS
CH2 INV BAL. Balanced point variation: ≤1 DIV (Reference at center graticule).
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3 
MODELSPECIFICATIONS GOS-620 20MHz OSCILLOSOPE
Triggering source
CH1, CH2, LINE, EXT (CH1 and CH2 can be selected only in the DUAL or ADD vertical mode).
In ALT mode, if the TRIG. ALT switch is pushed in, it can alternate triggering of two different
source.
Coupling AC: 20Hz to full bandwidth.
Slope + / -.
Sensitivity
20Hz 〜2MHz : 0.5 DIV, TRIG-ALT:2 DIV, EXT : 200mV.
2 〜20MHz : 1.5 DIV, TRIG-ALT:3 DIV, EXT : 800mV.
TV : Sync pulse more than 1 DIV (EXT: 1V).
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 is 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.: 1M ohm // approx. 25Pf.
TRIGGERING
Max. Input Voltage 300V (DC+AC peak), AC: Frequency not higher than 1kHz.
Sweep Time 0.2μSec 〜0.5 Sec/DIV, 20 steps in 1-2-5 sequence.
Sweep Time Accuracy ±3%.
Vernier Sweep Time Control ≤1/2.5 of panel-indicated value.
Sweep Magnification 10 times
×10MAG Sweep Time Accuracy ±5%, (20nSec〜50nSec are uncalibrated).
Linearity ±3%, ×10MAG:±5% (20ns and 50ns are uncalibrated).
HORIZIONAL
AXIS
Position shift caused by ×10MAG Within 2 div. at CRT screen center.
Sensitivity Same as vertical axis (X-axis:CH1 input signal; Y-axis:CH2 input signal.).
Frequency Bandwidth DC to at least 500kHz.
X-Y MODE
X-Y Phase Difference ≤30 at DC 〜50kHz.
Sensitivity 5 Vp-p (Positive-going signal decreases intensity).
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4 
MODEL
SPECIFICATION GOS-620 20MHz OSCILLOSCOPE
Frequency Bandwidth DC 〜2MHz.
Input resistance Approx. 47KΩ.
Z AXIS
Maximum Input Voltage 30V (DC+AC peak, AC frequency≤1kHz).
Waveform Positive-going Square wave.
Frequency Approx. 1 kHz.
CALIBRATION Duty Ratio Within 48:52.
Output Voltage 2 Vp-p ±2%.
VOLTAGE
Output Impedance Approx. 1 kΩ.
Type 6-inch rectangular type, internal graticule.
Phosphor P 31.
Acceleration Voltage Approx. 2kV.
Effective Screen Size 8 x 10 DIV (1 DIV = 10mm (0.39in)).
Graticule Internal.
CRT
Trace Rotation Provided.
GENERAL
Power Source AC115V, 230V ± 15% selectable, 50Hz or 60Hz.
Power Consumption Approx. 45VA, 40W(max.)
Operation Environment
Indoor use
Altitude up to 2000 m
Ambient temperature :
To satisfy specifications :10°to 35℃(50°to 95°F)
Maximum operating ranges: 0°to 40℃(32 °to 104°F)
Relative humidity: 85% RH(max.) non condensing
Installation Category II
Pollution degree 2
Storage Temperature & Humidity -10°to 70℃, 70%RH(maximum).
Accessories Powercord ×1, Instructionmanual ×1
Probes ×2, GTL-101 ×1
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5 
Dimensions 310 (W) x 150 (H) x 455 (D) mm.
Weight Approx.8k+gs (17.6lbs).
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6 
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 and/or 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.
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:
Line voltage Range Fuse
AC 115V 97~132V T0.63A
250V
AC 230V 195~250V T0.315A
250V
WARNING. To avoid personal injury, disconnect the power cord before removing the fuse holder.
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7 
3.3 Environment
The normal ambient temperature range of this instrument is from 0°to 40°C (32°to 104°F). To operate the instrument over
this specific temperature range may cause damage to the circuits.
Do not operate the instrument in a place where strong magnetic or electric field exists as it may disturb the measurement.
3.4 Equipment Installation and Operation
Ensure there is proper ventilation for the vent of the instrument. If it is not according to the specification to operate the
instrument, the protection provided by the instrument may be impaired.
3.5 CRT Intensity
To prevent permanent damage to the CRT phosphor, do not let the CRT trace brighten excessively or stays the light spot for
an unreasonable long time.
3.6 Withstanding Voltages of Input Terminals
The withstanding voltages of the instrument input terminals and probe input terminals are shown in the following table. Do
not apply voltage higher than the specification. When set probe switch at 1: 1, the maximum effective readout is 40Vp-p
(14Vrms at Sine wave), set probe switch at 10: 1, the maximum effective readout is 400Vp-p (140Vrms at Sine wave).
Input terminal Maximum input voltage
CH1, CH2, inputs 300Vpeak
EXT TRIG IN input 300Vpeak
Probe inputs 600Vpeak
Z AXIS input 30Vpeak
CAUTION. To avoid an
y
dama
g
e, do not
appl
y
exceedin
g
maximum input volta
g
e of the
frequency less than 1 kHz to the instrument.
If an AC voltage which is superimposed on a DC voltage is applied, the maximum peak value of CH1and CH2 input voltages
must not exceed ±300V, so is the AC voltages with a mean value of zero voltage, the maximum peak to peak value is
600Vp-p.
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8 
4.PANEL INTRODUCTION
zFig. 4-1. Front Panel
26
+
X10 MAG
12 3 4 56
ROTATION
TRACE
2Vp-p
1 KHz
CAL INTEN FOCUS POWER
11789 10 1412 13 15 1716
POSITION
GND
1M 25pF
PULLx5MAG
CH1
W
MAX. 300Vpk
CAT
X
VAR.
AC
DC
CAL
VOLTS/DIV
1
5
2
V.5
10
20
5
.1.2
50
mV
DUAL
ALT
CHOP
ADD
CH2
CH1 CH2 INV
GND
AC
DC
MODE
VERTICAL
BAL
DC
.2
S
CAL .1
50
X-Y
.5
DC
BAL
POSITION
UNCAL
.5
.2
1
x10
OSCILLOSCOPE with FG
R
GOS-620FG
20MHz
33
100
SWP. VAR.
FREQUENCY
POSITION
MIN
GENERATOR
AMPLITUDE
HORIZONTAL
MAX
DC-OFFSET
PULL
1M 100k 10k 1k
32 45 31 43 44
FUNC
TIME/DIV
2
5
10
20
mS
1.5 .2 .1
RANGE
10 1
10
5
m
S
2
20
50
LEVEL
-
TRIG. ALT
4030 42 40 2829 27
18 19 20 21 22
Y
1M 25pF
MAX. 300Vpk
CAT
PULLx5MAG
CH2
W
VAR. CAL
10
20
1
5
2
V.5
5
.1.2
50
VOLTS/DIV
-
50 W
mV
GENERATOR
OUTPUT
SLOPE
+
TV-V
TV-H
LINE
EXT
MODE
TRIGGER
NORM
AUTO CH1
CH2
SOURCE
2325 39
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9 
zFig. 4-2 Rear Panel
Z-AXIS INPUT
CH1 OUTPUT
20mV/DIV INTO 50
TRIG IN
1M 25pF
97~132V
RANGE
(50/60Hz)
IEC1010 250V CAT
195~250V
POWER MAX. 40 WATTS, 45VA
CONDUCTOR MUST BE CONNECTED TO GROUND.
38 37 36
ENSURE THE POWER IS REMOVED FROM
THE INSTRUMENT BEFORE REPLACING THE FUSE
NO OPERATOR SERVICEABLE COMPONENTS INSIDE. DO NOT REMOVE
FOR CONTINUED FIRE PROTECTION. REPLACE ONLY WITH SPECIFIED
230
115
TYPE AND RATED FUSE.
COVERS. REFER SERVICING TO
AC
230V
LINE VOLTAGE
SELECTION
115V
QUALIFIED PERSONNEL.
TO AVOID ELECTRIC SHOCK THE POWER CORD PROTECTIVE GROUNDING
WARNING
CAT
34
T 0.315A
250V
FUSE
250V
T 0.63A
WCAT
300Vpk
MAX.
W
30Vpk MAX.
35 24
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10 
4-1.Front Panel
CRT :
(6) POWER
Main power switch of the instrument. Turn on the switch to get the LED (5) lighted.
(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) CH1 (X) input
The vertical input terminal of CH1 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.
(10) & (18) AC-GND-DC
Select connection mode between input signal and vertical amplifier.
AC ACcoupling
GND Vertical amplifier input is grounded and input terminals are disconnected.
DC DCcoupling
(7) & (22) VOLTS/DIV
Select the vertical axis sensitivity from 5mV/DIV to 5V/DIV with 10 ranges totally.
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11 
(9) & (21) VARIABLE
Fine adjustment of sensitivity with a factor of ≥1/2.5 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) CH1 & CH2 DC BAL.
The knobs are used for adjusting the attenuator balance. See DC BAL adjustments for details.
(11) & (19)56POSITION
Vertical positioning control of trace or spot.
(14)VERT MODE : Select operation modes of CH1 and CH2 amplifiers.
CH1 Operate the oscilloscope as a single-channel instrument by selecting CH1 alone.
CH2 Operate the oscilloscope as a single-channel instrument by selecting CH2 alone.
DUAL Operate the oscilloscope as a dual-channel instrument by selecting CH1 and CH2.
ADD The oscilloscope displays the algebraic sum (CH1 + CH2) or subtraction (CH1 - CH2) of the two signals
(the subtraction function effects only when push in CH2 INV (16) button).
(12)ALT/CHOP
When this switch is released in the dual-trace mode, the channel 1 and channel 2 inputs are alternately displayed
(normally used at faster sweep speeds).
When this switch is depressed in the dual-trace mode, the channel 1 and channel 2 inputs are chopped and displayed
simultaneously. (normally used at slower sweep speeds).
(16)CH2 INV
When press CH2 INV button, it will inverts the CH2 input signal in CH2 and in ADD MODE, the channel 2 trigger
signal pickoff is also inverted.
Triggering
(24)EXT TRIG IN input terminal
Input terminal is used for external triggering signal. To use this terminal, set SOURCE (23) to the EXT position.
(23)SOURCE
Select the internal triggering source signal, and the EXT TRIG IN input signal.
CH1 Press key DUAL or ADD of VERT MODE (14), select CH1 to get internal triggering source signal.
CH2 Press key DUAL or ADD of VERT MODE (14), select CH2 to get internal triggering source signal.
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12 
(27)TRIG.ALT
Set VERT MODE switch (14) in DUAL or ADD key, select CH1 or CH2 by the SOURCE switch (23), then press
TRIG.ALT switch (27), the internal triggering source signal will display alternately from CH1 and CH2.
LINE Display the 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.
“-” 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 on the 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 sweep time ranges from 0.2 us/div to 0.5 s/div with 20 steps totally.
X-Y Use the instrument as an X-Y oscilloscope by setting to X-Y position.
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13 
(30)SWP.VAR
Vernier control knob of the sweep time used when CAL and the sweep time is calibrated to the value preset in
TIME/DIV. The sweep of TIME/DIV can be varied continuously when shaft is not in CAL position. Rotate the control
knob to CAL position and the sweep time is calibrated to the preset value of the TIME/DIV. Counterclockwise rotate the
control knob to the bottom to delay the sweep by 2.5 time or more.
(32)34POSITION
Adjust the trace or spot in horizontal position.
(31)×10 MAG
Magnify 10 by pressing the button.
Others:
(1) CAL
This terminal delivers the calibration voltage of 2 Vp-p, 1kHz, positive square wave.
(15)GND
Ground terminal of oscilloscope mainframe.
4-2.Rear Panel
(34)Z AXIS INPUT
Input terminal for external intensity modulation signal.
(35)CH1 SIGNAL OUTPUT
Delivers a voltage of approximately 20mV/DIV from the CH1 signal to 50Ωterminal for frequency counting.
AC POWER Input Circuit:
(36)AC Power input connector
Connect the AC power cord (supplied) to this connector.
(37)FUSE & line voltage selector
Fuse rating is shown in Page 7 Line voltage selector to select power sources.
(38)Studs
Studs is not only used as a stand for laying the oscilloscope on its back to operate it in the upward posture, also used for
winding up the power cord.
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14 
5.OPERATION METHOD
5-1.Basic Operation---Single-channel Operation
Before connecting the power cord to an AC line outlet, make sure that the AC line voltage input switch on the rear panel of
the instrument is correctly set for the AC line voltage. After ensuring the voltage setting, set the switches and controls of the
instrument as shown below:
Item No Setting Item No Setting
POWER (6) Disengage position(OFF)
SLOPE (26) +
INTEN (2) Mid-position TRIG. ALT (27) Released
FOCUS (3) Mid-position TRIGGER MODE (25) AUTO
VERT MODE (14) CH1 TIME/DIV (29) 0.5mSec/DIV
ALT/CHOP (12) Released(ALT) SWP.VER (30) CAL position
CH 2 INV (16) Released 34POSITION (32) Mid-position
56POSITION (11)(19) Mid-position x10 MAG (31) Released
VOLTS/DIV (7)(22) 0.5V/DIV
VARIABLE (9)(21) CAL(clockwise position)
AC-GND-DC (10)(18) GND
SOURCE (23) CH1
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15 
After setting the switches and control knobs as mentioned, connect the power cord to the AC line outlet, then follow the
procedure describes as follows:
1) Press the POWER switch and make sure that the power LED is on. In about 20 seconds, a trace will appear on the CRT
screen. If no trace appears in about 60 seconds, counter check the switch and control setting.
2) Adjust the trace to an appropriate brightness and image with INTEN and FOCUS control knob respectively.
3) Align the trace with the horizontal central line of the graticule by adjusting the CH1 POSITION control knob and
TRACE ROTATION control knob (adjusted with screwdriver).
4) Connect the probe to the CH1 INPUT terminal and apply 2Vp-p CALIBRATOR signal to the probe tip.
5)
6)
7)
8)
Set the AC-GND-DC switch to AC, a waveform will be displayed on the CRT
screen as shown in the figure 5-1.
Adjust the FOCUS control knob to trace image sharply.
Display the signal waveform clearly by adjusting the VOLTS/DIV switch and
TIME/DIV switch to appropriate position.
Adjust the 56 POSITION and 34POSITION control knobs to appropriate
position to align the waveform with the graticule, so that voltage (Vp-
p
) and
period (T) can be read conveniently.
zFIG. 5-1
The descriptions above are the basic operating procedures for CH1 single-channel operation of oscilloscope. So is CH2
single-channel operation. For further operation methods will be explained in the subsequent paragraph.
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