GW Instek GOS-6200 User Manual

GOS-6200 OSCILLOSCOPE

USER MANUAL

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 Operati on………………... .

3-5.CRT Intensity…………………………………………… 3-6.Withstanding Voltage of Input Terminals …………… ...

4. PANEL INTRODUCTION……………………..…………... 4-1.Front Panel………………………………………………. 4-2.Rear Panel……………………………………….……….

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……………………………….

6. MAINTENANCE…………………………………………… 6-1.Fuse Replacement……………………………………….. 6-2.Line Voltage…………………………………………..…. 6-3.Cleaning………………………………………………….

8 8 8 9 9 9 9

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36 36 38 39 41 43 52

56 56 56 57

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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

7. BLOCK DIAGRAM………………………………………... 58

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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:

USER MANUAL

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

0.75mm

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 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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EC Declaration of Conformity

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, C hina.

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

Current Harmonic EN 61000-3-2: 1995 Voltage Fluctuation EN 61000-3-3: 1995

————————————————

Electrostatic Discharge EN 61000-4-2: 1995 Radiated Immunity EN 61000-4-3: 1996 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

USER MANUAL

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 func tion. Ten different user defined instrument settings can be saved and recalled without re stricti on.

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.

Low Voltage Equipment Directive 73/23/EEC & amended by93/68/EEC

Safety Requirements

IEC/EN 61010-1: 2001

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1-2.Features

Additionally, the oscillo scope off ers seve ral othe r feat ures:

1) High intensity and internal graticule CRT The oscilloscope employs a high intensity 6-inch retangular type cathode-ray tube with red internal gratic ule. It displays clear readable traces even at high sweep speeds. Internal graticule lines eliminate parallax-viewing erro r be twee n the trac e and the gra ti cul e 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 si gnal because a hi gh-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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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

VERTICAL DEFLECTION SYSTEM

TRIGGER SYSTEM

Sensitivity Accuracy Vernier Vertical Sensitivity

Frequency Bandwidth(-3dB) DC ~ 200MHz (5mV/DIV:DC~150MHz)

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

Vertical Modes CHOP Repetition Frequency Approx. 250kHz.

Polarity (INV) CH2 only Bandwidth Limited 20MHz Common-mode

Rejection Ration 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

Trigger Sensitivity

Trigger Level Range

TV Sync

Max. External Input Voltage 400V (DC + AC peak) at 1kHz External Input Impedance

±3% (5 DIV at the center display ) Continuously variable to 1/2.5 or less than

panel-indicated value

(2mV/DIV:DC ~ 20MHz)

1MΩ±2% // 25pF approx. CH1,CH2,DUAL(CHOP/ALT),ADD(DIFF mode can

Be established when the CH2 is in the INV mode)

50:1 or better at 50kHz

Mode Frequency INT EXT

AUTO

TV Sync signal 1DIV 200mVpp

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) SECAM(625H)

1MΩ± 5% // 25pF approx.

10Hz~20MHz 0.35DIV 50mVpp

20MHz~200MHz 1.5DIV 150mVpp

DC~20MHz 0.35DIV 50mVppNORM

20MHz~200MHz 1.5DIV 150mVpp

1H~313H 1H~312H

HORIZONTAL DEFLECTION SYSTEM

X-Y OPERATION

CURSOR READOUT FUNCTION

AUTO MEASUREMENT FUNCTION

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Horizontal Modes MAIN(A), ALT, DELAY(B) A (main) Sweep Time 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 Alternate Separation Variable

Sensitivity Accuracy

X-axis Bandwidth DC~500kHz (-3dB) Phase Error

Cursor Measurement Function Cursor Resolution 1/100 DIV

Effective Cursor Range Vertical: ± 3 DIV; horizontal: ± 4 DIV Panel setting

Parameter Function

Display Digits Max. 6-digits, decimal. Frequency Range 50Hz~200MHz.

Accuracy

Measuring Sensitivity

20ns~0.5sDIV, continuously variable (UNCAL)

X-axis, Y-axis selectable X-axis: CH1, CH2Æ 2mV~5V/DIV ± 3%

EXT Æ 0.1V/DIV ± 5% EXT/10 Æ 1V/DIV ± 5%

Y-axis: CH1,CH2Æ 2mV~5V/DIV ± 3%

3°or less at DC~50kHz ΔV,ΔV%,ΔVdB,ΔT,1/ΔT,ΔT%,Δ

Vertical: V/DIV (CH1,CH2),UNCAL, ADD,

INV, P10, AC/DC/GND.

Horizontal: S/DIV (MTB, DTB), UNCAL x 10MAG, Delay time, Hold-off. Trigger: Source, Coupling, Slope, Level , TV-V/TV-H/TV-L. Others: X-Y, LOCK, SAVE/RECALL MEM 0-9.

FREQ, PERIOD,±WIDTH, ±DUTY, (+ or – polarity selected by trigger slop.)

1kHz~200MHz: ±0.01% 50Hz~1kHz : ±0.05% >2div(measuring source selected from CH1

and CH2 as synchronous signal source.)

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GOS-6200 OSCILLOSCOPE

CRT

Z-AXIS INPUT

TRIGGER SIGNAL OUTPUT

CALIBRATOR OUTPUT

SPECIAL FUNCTION

LINE POWER REQUIREMENT

OPERATING ENVIRONMENT

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Type

Phosphor P31 Accelerating Potential 14.5kV approx. Illumination Continuous adjustable

Coupling DC Voltage 5V or more Maximum Input Voltage 30V (DC+AC peak) at 1kHz or less Bandwidth DC~5MHz Voltage

Frequency Response DC~10MHz Output Impedance

Waveform 1kHz ± 5%, square wave Voltage 2Vpp ± 2% Impedance

Auto Set Panel Setting Save & Recall 10 sets

Panel Setups Lock Provided Voltage Frequency 50Hz or 60Hz Power Consumption Approx. 90VA, 75W(max.) 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

6-inch rectangular type with internal graticule 0%, 10%, 90% and 100% markers. 8 x 10 DIV (1 DIV = 1 cm)

External intensity modulation

25mV/DIV approx. in 50Ω termination

50Ω approx.

2kΩ approx. Input Channel: CH1,CH2;

Frequency Response 50Hz~50MHz

AC 100V, 120V, 230V ± 10% selectable

STORAGE TEMPERATURE & HUMIDITY

MECHANICAL SPECIFICATION

ACCESSORIES

USER MANUAL

-10° to 70℃, 70%RH(maximum)

Dimensions 310 W × 150 H × 485 D (mm) Weight Approx. 9.5kgs (20.9 lbs)

Power cord….............……….. 1

Instruction manual…………… 1 Probe (×1/×10)…………..… 2

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3.PRECAUTIONS BEFORE OPERATION

3-1.Unpacking the Oscilloscope

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 oscilloscope can be applied any kind of 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.

When line voltages are changed, replace the required fuses shown as below:

Line voltage Range Fuse Line voltage Range Fuse

100V 120V

90-110V

108-132V

WARNING. To avoid personal injury, disconnect the power

cord before removing the fuse holder.

T 1A250V 230V 207-250V T 0.4A250V

USER MANUAL

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 ci rcuit s. Do not use 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 vents in the oscilloscope case. If the equipment is used not according to the specification, the protection provided by the equipment may be impaired.

3-5.CRT Intensity

To prevent permanent damage to the CRT phosphor, do not make the CRT trace brighten excessively or leave the spot stay for an unreasonably 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 voltages higher than these limits.

Input terminal Maximum input voltage

CH1, CH2, inputs 400V (DC + AC peak)

EXT TRIG input 400V (DC + AC peak)

Probe inputs 600V (DC + AC peak)

Z AXIS input 30V (DC + AC peak)

CAUTION. To avoid damaging the instrument, do not apply input voltages of the frequency over 1 kHz to the instrument.

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4. PANEL INTRODUCTION

After the instrument is switched on, all the important settings are displayed in the readout. The LED’s located on the front panel assist operation and indicate additional information. Incorrect operation and the electrical end positions of control knobs are indicated by a warning beep.

Except the Power pushbutton (POWER), the Focus control (FOCUS), the Scale Illumination control (ILLUM) and the Trace Rotation control, all other controls are electronically selected, an d their functions and settings can therefore be stored.

The front panel is subdivided into six sections:

z Display controls z Vertical controls z Horizontal controls z Trigger controls z Measurement and SAVE/RECALL controls z Input connectors

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Front panel of GOS-6200

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4-1.Front Panel

Display controls

The display controls adju st the on-screen appearance of the waveform and provide a probe compensation signal source.

(1).POWER – Pushbutton and symbols for ON(1) and OFF(0).

When switch on the oscilloscope to have all LEDs lighted and the software version will be displayed on the sc reen. After the Internal test is completed successfully, the normal operation mode is present. Then the last settings become activated and the LED indicates the ON condition.

(2).INTEN-TRACE/READOUT & READOUT ON/OFF— Control

knob with associated pushbutton and readout display.

The control knob is used for adjusting the traces and readout intensity. Turning the knob clockwise to increase the intensity and turning it counterclockwise to decrease the intensity. The TRACE/READOUT pushbutton is for selecting the intensity function and indicates the letter “TRACE INTEN” or “READOUT INTEN” in the readout. Press the pushbutton briefly for the following sequences: “TRACE INTEN” — “READOUT INTEN” — “TRACE INTEN”

READOUT ON/OFF

Pressing and holding the TRACE/READOUT pushbutton switches the readout on or off.

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(3).TRACE ROTATION

The TRACE ROTATION is for aligning the horizontal trace in parallel with graticule lines. This potentiometer can be adjusted with a small screwdriver.

(4).FOCUS

The control knob effects both the trace and the readout sharply.

(5).ILLUM

The knob controls the graticule illumination brightness.

(6).CAL

The terminal provides a reference signal of 2Vp-p at 1kHz for probe adjustment.

Vertical controls

The vertical contr ols select the displayed signals and contro l t he a mpl it ude characteristics.

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(7).20MHz BWL – Pushbutton with indicator LED.

Briefly pressing the push button, the bandwidth is reduced to approx. 20MHz, and the measurement is made by eliminating undesired high frequency signal from the waveform. Also the high frequency component over 20MHz is eliminated from the trigger signal.

(8).CURSOR POS - △V1/2 — Pushbutton with double function and

associated indicator LED.

The function of Cursor Position or CH1/CH2 Position can be selected only after the pushbutton of Cursor Function is pressed to appear enabling their cursor measurement. Press the pushbutton once briefly to have the related LED lighted, the CH1/CH2 POSITION control knob is then operated as CURSOR 1/CURSOR 2 POSITION control.

△V1/2

The function is required and available only in DUAL mode in combination with △V (Voltage) measurement. Pressing and holding the pushbutton, then switch between CH1 and CH2, the measured result will be displayed by the readout with “△V1…” or “△V2…” providing the defection coefficient is calibrated. The settings of the cursors must be related to the signal of the selected channel.

(9).CH1 POSITION – C1 — Control knob with double function.

The vertical trace position of channel 1 can be set with the control knob, which is also operated as CURSOR 1 position control in cursor measurement mode.

(10)CH2 POSITION – C2 — Control knob has several functions.

The vertical trace position of channel 2 can be set with the control knob, which is also operated as CURSOR 2 position control in cursor measurement mode. In alternate time base mode, this control knob can be used to separate the DELAY time base trace from the MIAN time base trace. Please note TRACE SEP (11).

USER MANUAL

(11)TRACE SEP

The instrument contains a trace separate function which is required in the alternate time base mode to separate the DELAY time base trace(s) from the MAIN time base in vertical direction. Consequently this function is only available in alternate time base mode. Press the pushbutton once to have the related LED lighted, the CH1 POSITION control knob is then operated as vertical position control for the trace(s) of the DELAY time base.

(12)ALT/CHOP/ADD-INV

The pushbutton has several functions, which are required and available only when both channels are active. ALT– Displays in the readout, indicates alternate cha nnel switching. After each time base sweeps the instrument internally , switches over from channel 1 and channel 2 and vice versa.

CHOP– Indicates chopper mode.

The channel switching occurs constantly between channel 1 and channel 2 during each sweep. ADD– Displays in the readout, indicates additional mode. Whether the algebraic sum (addition) or the difference (subtraction) of both input signals is displayed, depends on the phase relationship and the INV setting. As a result, both signals are displayed as one signal. For correct measurements, the deflection coefficients for both channels must be equal. INV—Pressing and holding the pushbutton to set the channel 2 invert function on or off. The invert on condition is indicated with a horizontal bar above “CH2” in the readout. The invert function causes the signal display of channel 2 to be inverted by 180

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