Artisan Technology Group GOS 620FG Oscilloscope User Manual

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20MHz Dual Trace Oscilloscope with Function Generator

MODEL: GOS-620FG

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CONTENTS

1

.

PRODUCT INTRODUCTION

PAGE

...............................................................................................

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

S.1.Basic Operation

............................................................................................................

17

5.2.Dual.channel Operation

.................................................................................................

5.3.ADD Operation

5.4.Triggering

5.S.TIM E I D I V Control

.......................................................................................................

5.6.Sweep Magnification

5.7.X.Y Operation

..............................................................................

.....................................................................................................

17

............................................................................................................

..................................................................................................................

23

23

............................................................................................................

5.8.Calibration

.................................................................................................................

5.9.DC B A L Adjustment

5.IO.Function Generator

.....................................................................................................

25

.....................................................................................................

25

MAINTENANCE

6.1.Fuse Replacement

6.2.Line Voltage

6.3.Cleaning

.....................................................................................

26

........................................................................................................

...............................................................................................................

..................................................................................................................

BLOCK DIAGRAM

...................................................................................

28

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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

High Voltage

ATTENTION Protective Frame or chassis 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

Yellow.

@ or coloured Green or Green &

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 h s e . 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 h s e & 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: Electromagnetic compatibility

-

(1993) Generic emission standard

Part 2:

industrial

Environment

Conducted Emission EN 5501 1 class B

Radiated Emiss~on (1991)

I

Low Voltage Equipment Directive 73/23/EEC

Low Voltage Directive

I

EN 61010-1 : (1993)+A2:(1995)

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 0.1 Hz to I MHz.

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 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 '2.

9) Three kinds of waveforms are available with 50R output.

10)Waveform frequency is up to

I MHz.

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GOS-620FG 20MHz OSCILLOSCOPE

+

FUNCTION GENERATOR

PECIFICATIONS

,OSCILLOSCOPE -

5VIDIV. 10 stem in 1-2-5 seauence

53% ( x

5 MAG : 55%). Sensitivity Accuracy

Vernier Vertical sensitivity To 112.5 or less of panel-indicated value.

DC-20MHz ( x 5MAG: DC-7MHz).

Frequency bandwidth AC coupling: Low limit frequency of 10Hz.

(With reference to IOOkHz, 8DIV. Frequency response at -3dB).

Approx. 17.5nS (x5 MAG: Approx. 50nS). Rise time

Input impedance

Square Wave

Characteristics

Approx. 1M ohm 11 Approx. 25pF.

Overshoot : 5 5% ( At IOmVIDIV range).

Other distortions and other ranges: 5% added to the above value.

DC Balance Shift

Linearity

Panel adjustable.

< i O . l D I V of amplitude change when waveform of 2 DIV at graticule center is moved vertically.

'ERTICAL

AXIS

Vertical modes

CHI : CHI single channel.

CH2 : CH2 single channel.

DUAL : CHI and CH2 are displayed. ALT or CHOP selectable at any sweep rate.

ADD : CHI + CH2 algebraic addition.

Approx, 2 jOkHHz,

Frequency

Input Coupling AC, GND, DC.

.

.

Maximum Input Voltage Set probe switch at 1: 1, the maximum effective readout is 4 W p p (14Vrms at Sine wave). set probe switch at 10: 1, the maximum effective readout is 400Vpp(140Vrms at Sine wave). common Mode

Ratio

50:l br better at 5 6 w z sinusoidal wave. (When sensitivities of CHI and CH2 are set equally).

Isolation between channels >1000: 1 at 50kHz.

(At 5mVIDIV range)

CHI signal output

>30: 1 at 20MHz.

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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Coupling

Slope

GOS-620FG 20MHz OSCILLOSOPE

+

FUNCTION GENERATOR

'ECIFICATIONS

I

/Triggering source

J~ensitivity

'RIGGERING Triggering modes

I

CHI, CH2, LINE, EXT (CHI 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 source.

IAC:

20Hz to full bandwidth.

I+

I -. can alternate triggering of two different

--

2MHz : 0.5 DIV, TRIG-ALT:2 DIV, EXT : 200mV.

12

--

20MHz : 1.5 DIV, TRIG-ALT:3 DIV, EXT : 8OOrnV.

ITV

: Sync pulse more than 1 DIV (EXT: 1V).

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

Max. Input Voltage

Sweep Time

Sweep Time Accuracy

Approx.: 1 M ohm I/ approx. 25Pf.

300V (DC+AC peak), AC: Frequency not higher than I kHz.

1- 3%.

-

0.5 Sec/DIV, 20 steps in 1-2-5 sequence.

IORIZIONAL Sweep Magnification

AXIS xlOMAG Sweep Time

Accuracv

Linearity

10 times (maximum sweep time 100nSec/DIV).

4 59'0, (20nSec- 5OnSec are uncalibrated).

?3%, xlOMAG:+5% (20ns and 50ns are uncalibrated).

Position shift caused by

- - - -

.

- - -

Sensitivity

Within 2 div, at CRT screen center.

Same as vertical axis (X-axis:CHl input signal; Y-axis:CH2 input signal.).

LY Frequency Bandwidth DC to at least 500kHz.

Ix-Y

Phase Difference

ID' at DC -50kHz.

-

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GOS-620FG 20MHz OSCILLOSCOPE

+

FUNCTION GENERATOR

S P E C I F I C A T I O N

/sensitivity

Z AXIS

CALIBRATION

VOLTAGE

Input resistance

Maximum lnput Voltage

Waveform

Frequency

Duty Ratio

Output Voltage

Output Impedance

CRT

Type

Phosphor

Acceleration Voltage

Effective Screen Size

Graticule

Trace Rotation

2 . F U N C T I O N G E N E R A T O R

Output Function Range

Output Waveform

IFreauencv Variable Range

Output Voltage

Square wave Unsymmetry

Souare wave RiselFall Time

5 Vp-p (Positive-going signal decreases intensity).

DC

-

2MHz.

Approx. 4 7 K R .

30V (DC+AC peak, AC frequency51 kHz).

Positive-going Square wave.

Approx. 1 kHz.

Within 48:52.

Approx. I k R

6-inch rectangular type. internal graticule.

P 31.

Approx. 2kV.

8 x 10 DIV ( I DIV

= lOmm (0.39in)).

Internal.

Provided.

10 1 Hz

-

1 MHz (7 steps)

110: 1 or more.

5 0 R

W c u i t ) continuous conversion.

DC offset possible over

*

10V when opened.

1% MaxiloHz

-

20kHz)

( t 3 %

I

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SPECIFICATION

3.GENERAL

Power Source

Power Consumption

Operation Environment

Storage Temperature & Humidity

Accessories

Dimensions

Weight

GOS-620FG 20MHz OSCILLOSCOPE

+

FUNCTION GENERATOR

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 nstruction manual

'robes

X

X

X l l

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:

AC 1 15V

AC 230V

97-1 32V

195-250V

T 0.63A

T 0.3 15A

A

WARNING.

To avoid 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

I I

POWER MAX 40 WAIlS, 45VA

IEClDlO 25W CAT I1

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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 10 ranges totally.

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(9) & (2 1)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. See page 20 DC BAL adjustments for details.

(I I)&(] 9) * '

Vertical positioning control of trace or spot.

(I4)VERT MODE Select operation modes of CH 1 and CH 2 amplifiers.

CH I

CH 2

DUAL

ADD

Operate the oscilloscope as a single-channel instrument by selecting CHI alone.

Operate the oscilloscope as a single-channel instrument by selecting CH2 alone.

Operate the oscilloscope as a dual-channel instrument by selecting CHI and CH2.

The oscilloscope displays the algebraic sum (CHI

+

CH2) or subtraction (CHI

-

CH2) of the 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).

(1 6)CH2 INV

When press CH2 M V 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 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.

' 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 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 @om 0.2 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)s WP.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 sweep time 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 10 by pressing this key.

Function Generator:

(39)GENERATOR OUTPUT

The main output terminal with 50 R output impedance.

(40) WAVEFORM SELECTOR

The waveform change following after 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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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.

(3 8)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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5.0PERATION 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

POWER

INTEN

FOCUS

VERT MODE

ALTICHOP

CH 2 INV

A

POSITION

VOLTS/DIV

VARIABLE

AC-GND-DC

SOURCE

No

(6)

(2)

(3)

(14)

(1 2)

(16)

(1 1)(19)

(7)(22)

(9)(21)

(10)(18)

(23)

Setting

Disengage position(0FF)

Mid-position

Mid-position

CH 1

Released(ALT)

Released

Mid-position

0.5V/DIV

CAL(c1ockwise position)

GND

CHI

Item

SLOPE

TRIG. ALT

TRIGGER MODE

TIME/DIV

SWP.VER

'

I

No

k26)

(27j

(25)

(29)

(30)

(32)

Setting

+

Released

AUTO

O.SmSec/DIV

CAL position

Mid-position

Released

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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 turned 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 CHI INPUT terminal and apply 2Vp-p CALIBRATOR signal to the probe tip.

5) Set the AC-GND-DC switch to AC, a waveform will be displayed on the CRT 0 screen as shown in the figure 5-1.

FIG. 5-1

6) Adjust the FOCUS control knob to trace image sharply

7) Display the signal waveform clearly by adjusting the VOLTSIDIV switch and

TIMEIDIV switch to appropriate position.

8) Adjust the

'

POSITION control knobs to appropriate position to align the waveform with the graticule, so that voltage (Vp-p) and period (T) can be read conveniently.

The descriptions above are the basic operating procedures for CH 1 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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5-2.Dual-channel Operation

Set the VERT MODE switch to DUAL to display trace in CH2 (The procedure

is

same as CHI described in previous section). At this step, the calibrator signal

'

Fig. 5-2 appears in CHI is Square wave, but it appears in CH2 is a straight line as no signal applied to this channel yet.

Now, apply the calibrator signal to the vertical input terminal of CH2 through the probe with the same procedure as for CHI. Set the AC-GND-DC switch to AC, and adjust vertical POSITION knobs (I 1 ) and (l9), the signals will be displayed on both channels as shown in Figure 5-2.

S i of CHI

Signal of CW

When ALTICHOP switch is released (ALT MODE), the input signals which applied respectively to CHland CH2 appears on the screen alternately at each sweep. This setting is used when the sweep time is short in 2-channel observation.

When ALTICHOP switch is pressed (CHOP MODE), the input signals which applied to CH land CH2 are chopped and display on the screen at the same time with the frequency of 250kHz. This setting is used for low speed sweep.

Set to dual channel operation (DUAL or ADD mode), select CHI or CH2 signal from SOURCE switch to get triggering source signal. If both CHI and CH2 signals are in a synchronized relation, both waveforms will be displayed in stationary states. If not, only a signal stationary waveform will be appeared. If press TRIG. ALT push button, both waveforms can also be displayed in stationary states.

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5-3 ADD Operation

An algebraic sum of the CHI and CH2 signals can be displayed on the screen by setting the VERT MODE switch to ADD.

The displayed signal will be difference between CHI and CH2 if press CH2 INV push button. Adjust

A

POSITION knob of CH1 or CH2 can make vertical position, to the advantage of the linearity of the vertical amplifiers, it's better to set

A

POSITION knob of both channels in middle position.

5-4.Triggering

Proper triggering is essential for an efficient operation of the instrument. Users must make themselves familiar with the triggering functions and procedures thoroughly:

(1)Functions of MODE switch:

AUTO Select automatic sweep operation by setting to AUTO mode, the sweep generator will freely generate a sweep without a trigger signal. However, it will automatically switch to triggering sweep operation if an acceptable trigger source signal is preset. The AUTO mode is handy for observing the waveform when first set up the instrument, as it provides sweep function for waveform observation until properly set to other mode. Once starting to set the control mode, the operation often jumps back to the NORM trigger mode as it is much more sensitive. Automatic sweep must be used for DC measurements and signals with low amplitude in order not to trigger the sweep.

NORM

TV-V

The NORM mode provides normal triggering sweep operation. The sweep will not act until the selected trigger source signal crosses the threshold level set by TRIG LEVEL control knob. The triggering generate one sweep which will come to inactivate until another triggering occurs. In the NORM mode, there will be no trace unless an adequate trigger signal is present. In the ALT mode of dual trace operation with NORM sweep selected, there will be no trace unless both CHI and CH2 signals are adequate for triggering.

Set the MODE switch to TV-V mode, select vertical sync pulses for sweep triggering to view composite video waveforms. Select vertical sync pulses as a triggering to view vertical fields and frames of video. A sweep time of 2 msi'div is appropriate for viewing fields of video and 5 ms/div for complete frames (two interlaced fields) of video.

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TV-H Set the MODE switch to TV-H mode and select horizontal sync pulses for sweep triggering to view composite video waveforms. Select horizontal sync pulses as a triggering to view horizontal lines of video. A sweep time of about 10 usldiv is appropriate for displaying lines of video. Display the exact number of desired waveforms by setting SWP VAR control knob.

This oscilloscope synchronizes with only (-) polarity, that is, the sync pulses are negative and the video is positive as shown in Fig. 5-3.

Fig. 5-3

(2)Functions of SOURCE switch:

Apply the displayed signal itself or a trigger signal, which has a time relationship with the displayed signal, to the trigger circuit to display a stationary signal on the CRT screen. The SOURCE switch is used for selecting these trigger sources.

CHI

CH2

The internal trigger source is used most commonly.

The

signal applied to the vertical input terminal is branched off away from the preamplifier and is fed to the trigger circuit through the VERT MODE switch. Since the trigger signal is the measured signal itself, a stable waveform can be readily displayed on the CRT screen. When in the DUAL or ADD operation, the selected signal through the SOURCE switch is used as a trigger source signal.

LINE The AC power line frequency signal is used as a trigger signal. This method is effective when the measured signal has a relationship with the AC line frequency, especially for measurements of low level AC noise of audio equipment, thyristor circuits, etc.

EXT The sweep is triggered by an external signal applied to the external trigger input tenninal. An external signal which has a periodic relationship with the measured signal is used. Because the measured signal is not used as the triggering signal, the waveforms can be displayed more independent than the measured signal.

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(3)Functions of TRIG LEVEL control knob and SLOPE button:

A sweep triggering is developed when the trigger source signal crosses a preset threshold level. Rotate TRIG LEVEL control knob to vary the threshold level. In the "+" direction, the trigger threshold shifts to a more positive value, and in the "-

" direction, the trigger threshold shifts to a more negative value. When set the control knob in the center, the threshold level will be on the average of the signal used as the trigger source.

Adjust TRIG LEVEL control knob for the desired start point of sweep on a waveform. On sine wave signals, the phase at which sweep begins is variable. Note that if rotate TRIG LEVEL control knob toward its extreme "+" or "-", no sweep will be developed in the NORM trigger mode because the trigger threshold exceeds the peak amplitude of the sync signal.

When set TRIG SLOPE button to the (+) position (up), the sweep is developed form the trigger source waveform as it crosses the threshold level in a positive-going direction. When set TRIG SLOPE button to the (-) position (down), a sweep triggering is developed fiom the trigger source waveform as it crosses the threshold level in a negative-going direction. The slope (polarity) trigger signal as shown in Figure 5-4.

Fig. 5-4

(4) Function of TRIG ALT button:

The TRIG ALT button is used to select alternate triggering and display the selected DUAL-trace of VERT MODE (the switch control knob CHI. CH2, DUAL and ADD modes). In the alternate trigger mode (when select dual-trace operation), the trigger source alternates between CHI and CH2 with each sweep. This is convenient for checking amplitudes, wave-shape, or waveform period measurements, and even permits simultaneously observing two waveforms which are not related to frequency or period. However, this setting is not suitable for phase or timing comparison measurements. For such measurements, both traces must be triggered by the same sync signal.

If press both CHOP and TRIG ALT buttons during dual-trace operation, synchronization of the display is not possible because the chopping signal will be triggered. Use ALT mode itself, or select CH1 or CH2 as trigger source.

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5-5.TIMElDIV Control

Set the TIMEIDIV switch to display the desired number of cycles of the waveform. If there are too many cycles displayed with good resolution, set to increase the sweep speed. If only a line is displayed, try to slow down the sweep speed. When the sweep speed is faster than the observed waveform, only pan of it will be displayed, which may appear as a straight line for a Square wave or Pulse waveform.

5-6.Sweep Magnification

When a certain part of displayed waveform is needed to be expanded timewise, a faster sweep speed may be used.

However, if the required portion is apart from the starting point of the sweep, it may run off the CRT screen. In this case, push the xlOMAG button to expand 10 times the displayed waveform from the right to the left in the center of screen. The sweep time with the magnification operation is as follows:

(Value indicated by TIMEIDIV switch) x 1/10

Thus, the unmagnified maximum sweep speed (I nSec/DIV) can be increased with the magnification as follows :

1 pSecIDIV x 1/10

=

100nSec/DIV

FIG. 5-5

Any part can be covered by means of POSITION control

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5-7.X-Y Operation

Set the TIMEIDIV switch to X-Y position to operate the instrument as an X-Y oscilloscope. Each input is applied to the instrument as follows

X-axis signal (horizontal axis signal ) : CHI INPUT.

Y-axis signal (vertical axis signal) : CH2 INPUT.

Note:

When high frequency signals are displayed in X-Y operation, pay attention to the frequency bandwidth and phase difference between

X

and Y-axis.

FIG. 5-6

Y axis (CH2)

X

~ X i y

(CHI)

I i I I I I

The X-Y operation permits the oscilloscope to perform many state-of-the-art measurements which the conventional sweep operation could not make. The CRT display becomes an electronic graph of two instantaneous voltages. The display may be a direct comparison of the two voltages such as a vectorscope display of video color bar patterns. However, the X-Y mode can almost be used in graph of any dynamic characteristic if a transducer is adopted to change the characteristic (frequency, temperature, velocity, etc.) of voltage. One common application is frequency response measurements that the Y-axis corresponds to signal amplitude and the X-axis corresponds to frequency.

1. Set the TIMEIDIV control knob to the X-Y position (fdly counterclockwise), CHI becomes the X-axis input and CH2 becomes the Y-axis input.

2. Adjust X and Y positions by using the horizontal

'

POSITION and CH2

A

POSITION control knobs respectively.

3 . Adjust the amount of vertical (Y-axis) deflection by using CH2 VOLTSIDIV and VAR control knobs.

4. Adjust the amount of horizontal (X-axis) deflection by using CH 1 VOLTSIDIV and VAR control knobs.

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5-8.Calibration of Probe

As explained previously, the probe makes up a wide range attenuator. Unless phase compensation is properly done, the displayed waveform will be distortion causing measurement errors. Therefore, the probe must be properly compensated before use. Connect 10:l probe BNC to the INPUT terminal of

CHI

or

CH2

and set VOLTSIDIV switch at 50mV. Connect the probe tip to the calibration voltage output terminal and adjust the compensation trimmer on probe for optimum Square wave

(minimum overshoot, rounding off and tilt).

FIG. 5-7

(a) Correct compensation (b) Over compensation (c) Insufficient compensation

5-9.DC

BAL Adjustments

The ATT balance of the vertical axis can be adjusted easily.

(1)Set the input coupling switches of CHI and CH2 to GND and set the TRIG MODE to AUTO, then position the base line to the center.

(2)Adjust the VLOTSmIV switch to 5mV-1 OrnV and fix the line does not move.

5-1O.Function Generator

The instrument also provides the basic features of Function Generator to satisfy general demand with simply and intuitional operation method by adjusting the control knobs directly fiom front panel for output waveform, amplitude, DC level and etc.

All the control knobs located in front panel are marked with the same color to prevent missetting.

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The following instructions are executed by qualified personnel only. To avoid electrical shock, do not perform any servicing other than the operating instructions unless you are qualified to do so.

6-1.Fuse Replacement

If the fuse blows, the power lamp indicators will not light and the instrument will not start. The fuse holder should not normally be opened unless a problem has been caused to the unit. Try to determine and correct the cause of the blown fuse and replace with a fuse of correct rating and type (see page 7 ) on the rear panel (see fig. 4-2).

WARNING. For continued fire protection. Replace fuse only with 250V fuse of the specified type and rating, and disconnect power cord before replacing fuse.

6-2 Line Voltage Conversion

The primary winding of the power transformer is tapped to permit operation from 115V, or 230VAC 50160Hz line voltage.

Conversion from one line voltage to another is done by changing the line voltage selector switch as shown in Fig. 4-2. The rear panel identifies the line voltage to which the unit was factory set. To convert to a different line voltage, perform the following procedure:

(1)Make sure the power cord is unplugged.

(2)Adjust the line voltage selector switch to the desired line voltage position.

(3)A change in line voltage may also require a corresponding change of fuse value. Install the correct fuse value as listed on rear panel.

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6-3 Cleaning

To clean the instrument, use a soft cloth dampened in a solution of mild detergent and water. Do not spray cleaner directly onto the unit because it may leak into the cabinet and cause damage.

Do

not use chemicals containing benzine, benzene, toluene, xylene, acetone, or similar solvents. Do not use abrasive cleaners on any portion of the oscilloscope.

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7.BLOCK DIAGRAM

CH1 (X)

P R W P

EXT TRIG

W R I T

CH2

EXT

-

TRIG

INP(ITANP

X-AXIS S I W

TRIG

GENERATOR

A m 0

1

C1RCUi-l

(A) SWEEP

GENERATOR

FREE R W

S I W L

L

+

M C H I f f i

?LET

SUPPLY

AC LINE

--POWERE

CALIBRATOR

SOWRE-WAVE

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