GW Instek GOS-6103C User Manual

GOS-6103C OSCILLOSCOPE

GOS-6103C OSCILLOSCOPE

USER MANUAL

CONTENTS PAGE

1. PRODUCT INTRODUCTION................................................

1-1.Description……………………………………………….
1-2.Feature…………………………………………………...

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

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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……………………………….

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

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7. BLOCK DIAGRAM……………………………………….... 55

USER MANUAL

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

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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

2

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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GOS-6103C OSCILLOSCOPE

USER MANUAL

1.PRODUCT INTRODUCTION

1-1. Description

The GOS-6103C is a 100MHz, 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 auto
measurement for frequency, period, pulse width and duty cycle. Ten
different user defined inst rument settings can be saved and recalle d 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 50ns
per division (delayed sweep, 50ms to 50ns per division). The trigger system
provides stable triggering over the full bandwidth of the vertical deflection
system.

USER MANUAL

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 display s 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) Automatic time base range setting
At a press of the AUTORANGE 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 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 rout e
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 100MHz.

USER MANUAL

2.TECHNICAL SPECIFICATIONS

VERTICAL
DEFLECTION
SYSTEM

TRIGGER
SYSTEM

Sensitivity 2mV~5V/DIV,11 steps

Sensitivity Accuracy
Vernier Vertical Sensitivity

Frequency Bandwidth(-3dB) DC ~ 100MHz (2mV/DIV:DC ~ 20MHz)
Rise Time 3.5ns (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
Trigger Coupling AC, DC, HFR, LFR
Trigger Slope +/- polarity or TV sync polarity

Trigger Sensitivity

Trigger Level Range
TV Sync TV-V,TV-H

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

in 1-2-5 sequence
±3% (5 DIV at the center display )
Continuously variable to 1/2.5 or less than
panel-indicated value

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

1MΩ± 5% ∕∕ 25pF approx.

10Hz~20MHz 0.35DIV 50mVpp

20MHz~100MHz 1.5DIV 150mVpp

DC~20MHz 0.35DIV 50mVpp NORM

20MHz~100MHz 1.5DIV 150mVpp

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HORIZONTAL
DEFLECTION
SYSTEM

X-Y
OPERATION

CURSOR
READOUT
FUNCTION

AUTO
MEASUREMENT
FUNCTION

CRT

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

50ns~0.5s/DIV, continuously variable

(UNCAL)
B (delay) Sweep Time 50ns~50ms/DIV
Accuracy ± 3% (± 5% at × 10 MAG)
Sweep Magnification × 10 (maximum sweep time 5ns/DIV)
Hold Off time Variable
Delay Time 1us~5s
Delay Jitter 1/20000 or less
Alternate Separation Variable

X-axis, Y-axis selectable
Sensitivity Accuracy

X-axis: CH1, CH2 2mV~5V/DIV ± 3%

EXT  0.1V/DIV ± 5%

Y-axis: CH1,CH2 2mV~5V/DIV ± 3%
X-axis Bandwidth DC~500kHz (-3dB)

Phase Error
Cursor Measurement Function

3°or less at DC~50kHz

ΔV,ΔV%,ΔVdB,ΔT,1/ΔT,ΔT%,Δ

Θ

Cursor Resolution 1/100 DIV
Effective Cursor Range Vertical: ± 3 DIV; horizontal: ± 4 DIV
Panel setting

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.

Others: X-Y, LOCK, SAVE/RECALL

MEM 0-9.
Parameter Function

FREQ, PERIOD,±WIDTH, ±DUTY,

(+ or – polarity selected by trigger slop.)
Display Digits Max. 6 digits, decimal.
Frequency Range 50Hz~100MHz.
Accuracy

1kHz~100MHz: ±0.01%

50Hz~1kHz : ±0.05%
Measuring Sensitivity >2div(measuring source selected from CH1

and CH2 as synchronous signal source.)

Type

6-inch rectangular type with internal graticule

0%, 10%, 90% and 100% markers.

8 x 10 DIV (1 DIV = 1 cm)
Phosphor P31
Accelerating Potential 16kV approx.
Illumination Continuous adjustable

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External intensity modulation

Z-AXIS
INPUT

TRIGGER
SIGNAL
OUTPUT

CALIBRATOR
OUTPUT

SPECIAL
FUNCTION

LINE POWER
REQUIREMENT

.

OPERATING
ENVIRONMENT

STORAGE
TEMPERATURE
& HUMIDITY
MECHANICAL
SPECIFICATION

ACCESSORIES

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

25mV/DIV approx. in 50Ω termination

Frequency Response DC~10MHz
Output Impedance

50Ω approx.

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

2kΩ approx.

TIME/DIV Auto Range Provided
Panel Setting Save & Recall 10 sets
Panel Setups Lock Provided
Voltage

AC 100V, 120V, 230V ± 10% selectable

Frequency 50Hz or 60Hz
Power Consumption Approx. 90VA, 70W(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

-10° to 70℃, 70%RH(maximum)

Dimensions 310 W × 150 H × 455 D (mm)
Weight Approx. 9kg (19.8 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

100V
120V

108-132V

90-110V

Fuse

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

Line voltage Range

WARNING. To avoid personal injury, disconnect the power

cord before removing the fuse holder.

Fuse

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 circuits.
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
Voltage 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, and their functions and settings
can therefore be stored.

The front panel is subdivided into six sections:

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

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Front panel of GOS-6103C

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4-1.Front Panel

Display controls

The display controls adjust 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 screen. 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 to switch on

or off the readout.

USER MANUAL

(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 controls select the displayed signals and control the

amplitude characteristics.

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

Briefly pressing the pushbutton, 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 cont rol
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).

(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 sever al function s, which are requ ired and avail able
only when both channels are active.
ALT– Displays in the readout, indicates alternate channel 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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