GW Instek GOS-6200 User manual

GOS-6200 OSCILLOSCOPE
USER MANUAL
⎯i ⎯
CONTENTS PAGE
1. PRODUCT INTRODUCTION.................................................
1-1.Description……………………………………………….
1-2.Feature…………………………………………………....
1
1
2
2. TECHNICAL SPECIFICATIONS………………………… 4
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……………...
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8
8
9
9
9
9
4. PANEL INTRODUCTION……………………..…………...
4-1.Front Panel……………………………………………….
4-2.Rear Panel……………………………………….……….
10
12
34
5. OPERATION METHOD………………………………...….
5-1.Readout Display……………………………………..…...
5-2.Connecting Input Signals..………………………………
5-3.Adjustment and Checks…………………………………
5-4.Function Check…..………………………………………
5-5.Basic Operation………….….…………………………....
5-6.Measurement Application……………………………….
36
36
38
39
41
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52
6. MAINTENANCE……………………………………………
6-1.Fuse Replacement………………………………………..
6-2.Line Voltage…………………………………………..….
6-3.Cleaning………………………………………………….
56
56
56
57
7. BLOCK DIAGRAM………………………………………... 58
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USER MANUAL
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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 Earth(ground)
High Voltage refer to Manual Conductor Terminal
Terminal

GOS-6200 OSCILLOSCOPE
USER MANUAL
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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:
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.
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USER MANUAL
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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
0.75mm2should 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.

GOS-6200 OSCILLOSCOPE
USER MANUAL
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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
GOS-6200
is 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 class B: 1998 Electrostatic Discharge EN 61000-4-2: 1995
Current Harmonic
EN 61000-3-2: 1995 Radiated Immunity EN 61000-4-3: 1996
Voltage Fluctuation
EN 61000-3-3: 1995 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/ Interrupts
EN 61000-4-11: 1994
Low Volta
g
e E
q
ui
p
ment Directive 73/23/EEC & amended b
y
93/68/EEC
Safety Requirements
IEC/EN 61010-1: 2001
GOS-6200 OSCILLOSCOPE
USER MANUAL
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1.PRODUCT INTRODUCTION
1-1. Description
The GOS-6200 is a 200MHz, two-channel, dual-sweep, portable oscilloscope
for general purpose use. A microprocessor-based operating system controls
most of the functions of the instrument, including cursor readout and
digitized panel setting. On-screen alphanumeric readout and cursor function
for voltage, time, frequency and phase measurement provide extraordinary
operational convenience. It also has the function of TV Line select for
triggering setting, auto measurement for frequency, period, pulse width and
duty cycle and auto setting function. Ten different user defined instrument
settings can be saved and recalled without restriction.
The vertical deflection system has two input channels. Each channel has 11
basic deflection factors from 2mV to 5V per division. The horizontal
deflection system provides single, dual or delayed sweeps from 0.5s to 20ns
per division (delayed sweep, 50ms to 20ns per division). The trigger system
provides stable triggering over the full bandwidth of the vertical deflection
system.

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1-2.Features
Additionally, the oscilloscope offers several other features:
1) High intensity and internal graticule CRT
The oscilloscope employs a high intensity 6-inch retangular type
cathode-ray tube with red internal graticule. It displays clear readable
traces even at high sweep speeds. Internal graticule lines eliminate
parallax-viewing error between the trace and the graticule line.
2) Temperature compensation
The oscilloscope uses a temperature compensation circuit to reduce the
drift of base line and DC balance.
3) 20MHz bandwidth limit
When it is hard to observe or trigger a signal because a high-frequency
component is superimposed on the signal, use the 20MHz BWL
function to reduce the bandwidth of the vertical deflection system and
trigger system to 20MHz.
4) Auto-setting
At a press of the AUTOSET button, an optimum time base range is
automatically set to a corresponding change in input signal period. A
signal period from 1.6 to 4 cycles, signal amplitude from 1~7 div
approx. is displayed.
5) TV triggering
Exclusive TV sync separator circuit technology provides stable TV
signal measurements on fields, frames and lines.
6) Z-axis intensity modulation
For applying a blanking signal from an external source. The trace
displayed on the screen may be intensity-modulated where pulse signal
or time-scale marks are required.
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USER MANUAL
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7) Trigger signal output
The signal selected by the TRIGGER SOURCE is available. This
output may be used to connect to a frequency counter or other
instrument.
8) Panel setups lock
To avoid unintentional touch of the setting, the feature is extremely
useful for long term and repetitive measurements that used to be
performed under the same test condition of the oscilloscope setting.
9) LED indicator and buzzer alarm
The LED’s located in the front panel assist operation and indicated
additional information. Incorrect operation and the electrical end
position of control knobs are indicated by a warning beep.
10)SMD manufacturing technology
The instrument is built by using the most advanced SMD technology
so as to reduce the number of internal wiring and shorten the foil route
on the pc board. This will also greatly increase the high frequency
performance and the reliability of the product.
11)Auto Measurement
A built-in 6 digits universal counter is accurate within the range of
±0.01% and can measure frequency between 50Hz and 200MHz.

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2.TECHNICAL SPECIFICATIONS
Sensitivity 2mV~5V/DIV, 11 steps in 1-2-5 sequence
Sensitivity Accuracy ±3% (5 DIV at the center display )
Vernier Vertical Sensitivity Continuously variable to 1/2.5 or less than
panel-indicated value
Frequency Bandwidth(-3dB) DC ~ 200MHz (5mV/DIV:DC~150MHz)
(2mV/DIV:DC ~ 20MHz)
Rise Time 1.75ns(5mV/DIV:2.33ns) (2mV/DIV:17.5ns)
Signal Delay Leading edge can be monitored
Maximum Input Voltage 400V (DC+AC) at 1kHz or less
Input Coupling AC, DC, GND
Input Impedance 1MΩ±2% // 25pF approx.
Vertical Modes CH1,CH2,DUAL(CHOP/ALT),ADD(DIFF mode can
Be established when the CH2 is in the INV mode)
CHOP Repetition Frequency Approx. 250kHz.
Polarity (INV) CH2 only
Bandwidth Limited 20MHz
VERTICAL
DEFLECTION
SYSTEM
Common-mode
Rejection Ration 50:1 or better at 50kHz
Trigger Modes AUTO, NORM, TV
Trigger Source CH1, CH2, LINE, EXT. EXT/10
Trigger Coupling AC, DC, HFR, LFR, NR
Trigger Slope +/- polarity or TV sync polarity
Mode Frequency INT EXT
10Hz~20MHz 0.35DIV 50mVpp
AUTO 20MHz~200MHz 1.5DIV 150mVpp
DC~20MHz 0.35DIV 50mVppNORM 20MHz~200MHz 1.5DIV 150mVpp
Trigger Sensitivity
TV Sync signal 1DIV 200mVpp
Trigger Level Range INT : ± 4 DIV or more EXT : ± 0.4 V or more
EXT/10 : ± 4 V or more
TV-V, TV-H, TV-L
TV-Line Selection
Standard Field 1 Field 2
NTSC(525H) 1H~263H 1H~262H
PAL (625H)
TV Sync
SECAM(625H) 1H~313H 1H~312H
Max. External Input Voltage 400V (DC + AC peak) at 1kHz
TRIGGER
SYSTEM
External Input Impedance 1MΩ± 5% // 25pF approx.
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USER MANUAL
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Horizontal Modes MAIN(A), ALT, DELAY(B)
A (main) Sweep Time 20ns~0.5sDIV, continuously variable
(UNCAL)
B (delay) Sweep Time 20ns~50msDIV
Accuracy ± 3% (± 5% at × 10 MAG)
Sweep Magnification × 10 (maximum sweep time 2nS/DIV)
Hold Off time Variable
Delay Time 1us~5s
Delay Jitter 1/20000 or less
HORIZONTAL
DEFLECTION
SYSTEM
Alternate Separation Variable
Sensitivity Accuracy
X-axis, Y-axis selectable
X-axis: CH1, CH2Æ2mV~5V/DIV ± 3%
EXT Æ0.1V/DIV ± 5%
EXT/10 Æ1V/DIV ± 5%
Y-axis: CH1,CH2Æ2mV~5V/DIV ± 3%
X-axis Bandwidth DC~500kHz (-3dB)
X-Y
OPERATION
Phase Error 3°or less at DC~50kHz
Cursor Measurement Function ΔV,ΔV%,ΔVdB,ΔT,1/ΔT,ΔT%,Δ
Θ .
Cursor Resolution 1/100 DIV
Effective Cursor Range Vertical: ± 3 DIV; horizontal: ± 4 DIV
CURSOR
READOUT
FUNCTION
Panel setting Vertical: V/DIV (CH1,CH2),UNCAL, ADD,
INV, P10, AC/DC/GND.
Horizontal: S/DIV (MTB, DTB), UNCAL
x10MAG, Delay time, Hold-off.
Trigger: Source, Coupling, Slope, Level ,
TV-V/TV-H/TV-L.
Others: X-Y, LOCK, SAVE/RECALL
MEM0-9.
Parameter Function FREQ, PERIOD,±WIDTH, ±DUTY,
(+ or – polarity selected by trigger slop.)
Display Digits Max. 6-digits, decimal.
Frequency Range 50Hz~200MHz.
Accuracy 1kHz~200MHz: ±0.01%
50Hz~1kHz : ±0.05%
AUTO
MEASUREMENT
FUNCTION
Measuring Sensitivity >2div(measuring source selected from CH1
and CH2 as synchronous signal source.)