GW Instek GOS 6112 100MHz Readout Oscilloscope User Manual

EN 12687
в/м 134 65 5
100MHz Readout Oscilloscope
GOS-6112
User Manual
150-9001 CERTIFIED MANUFACTURER
{Ed insTex
-
All Rights Reserved
This manual contains proprietary information, which is protected by
copyrights. Al rights are reserved, No part of this manual mey be
photocopied. reproduced or translated to another language witionn
prior written consent of Gecd Will compar
The informatloa In ibis manual was conect at the time of printing
However, Good Will continues to improve producis and reserves the
rights to change specification, equipment, and maintenance
procedures at any time without notice.
Good Will instrument Co, Etd.
Na. 953-11, Pao-Chung Road, Hsin-Tien City, Taipei Hsien , Taiwan
(08-6112 OSCILLOSCOPE
USER MANUAL
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CONTENTS PAGE
I. PRODUCT INTRODUCTION ‚ 1
1-1.Description...........................iemene sesso 1
1-2.Feature..................... “eee 2
2, TECHNICAL SPECIFICATION......eeccnovorerorar e 4
3. PRECAUTIONS BEFORE OPERATION,..................... 7
3-1.Unpacking the instrument........ e... 7
3-2.Checking the Line Voltage... 7
3-3.Environment... . 8
3-4.Equipment Installation and Operation... avorsasssaeeees В
3-5.CRT Intensity...............reree-r inver neon reorecarióós 8
3-6.Withstanding Voltage of Input Terminals 8
4. PANEL INTRODUCTION........... esoncentacuarooonramnecas Y
1 rrereareaas H
4-2.Rear Panel.............. er... neerenenenirarnecaere nenes 30
5. OPERATION METHOD..........reececerenero reee aa 32
5-1.Readout Display... erenoaartmareroecene sor aro oo rene race 32
52.Connecting Input Signals. eanmarvanaracon meamenaa oe Eme ENs 34
5-3.Adjustment and Checks... "eoceevinarcamanacne ree 39
54.Function Check...............e......erreriaeaoanooeame carre 37
3-5.Basic Operation... x... cree 39
5-6.Measurement Application... .. 47
A anar aa eeorerareróós Si
6-I.Fuse Replacement.,...............e20aeer ara eraeaaan 51
6-2,Line Voltage... ..........nee.enineeo oia rannerre neos SÍ
ET an raane cena er cnaee 52
N cena rence 53
GO5-6112 OSCILLOSCOPE
USER MANUAL
SAFETY TERMS AND SYMBOLS
These terms may appear in this manual or on the product:
0 WARNING. Waming statements identify condition or
practices that could result in injury or loss of life.
practices that could result in damage to this product or
| CAUTION. Caution statements identify conditions or
other property.
The following symbols may appear In this manual or on the product:
A A © +
DANGER ATTENTION Protective Earth{ground)
High Voltage referto Manual Conductor Terminal
Terminal
GO5-6112 OSCILLOSCOPE
USER MANUAL
bai ———
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 cade:
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 ar P or coloured Brown ar Red.
If in doubt, consult the instructions provided with the equipment or
contact the supplier,
GOS-6112 OSCILLOSCOPE
USER MANUAL
"EC A
This cable/appliance should be protected by a snitably 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 Бу a ЗА ог 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.
G0OS-6112 OSCILLOSCOPE
USER MANUAL
ee ey
EC Declaration of Conformity
We
GOOD WILL INSTRUMENT CO, LTD.
(1) No. 95-11, Pao-Chung Rd, Hsin-Tien City, Taipei Hsien, Taïwan
2) Plot 522, Lorong Perusahaan Baru 3, Prai Industrial Estate, 13600 Prai,
Penang, Malaysia
declare, that the below mentioned product
GOS-6112
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 Clectromagnetic Compatibility
(89/366/EEC) and Low Voltage Equipment Directive (73/23/EEC).
For the evaluation regarding the Electromagnetic Compatibility and Low Voltage
Equipment Directive, the following standards were applied:
61000-3-2 (1995)
Voltage Fluctuation
N 61000 3-3 (199) _
E toéiromagtetic Capa Genie nit § чат UT be
Part 1- Residentiäl Commercial and Light Industry =: EU ВАО |
lectrostatic Discharge
EN 61000-4-2: 1994
Radiated [Immunity
NV 50140: 1993
lectrica] Fast Transients
IN 61000-4-4: 1993
urge Immunity
61000-4-5: 1995
aro Dips / Interrupts
НМ 61010-1: 1995
GOS-6112 OSCILLOSCOPE
USER MANUAL
"E e —
1.PRODUCT INTRODUCTION
1-1. Description
The GOS-6112 is a 100MHz, two-channel, dual-sweep, portabie 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.
The vertical deflection system has two input channels. Each channel has 11
basic deflection factors from 2mY to 5V per division. The honzontal
deflection system provides single, dual or delayed swecps from 0.5s to 50ns
per division (delayved sweep, 50ms to 50ns per division). The trigger system
provides stable triggering over the full bandwidth of the vertical deflection
system.
GO5-6112 OSCILLOSCOPE
USER MANUAL
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1-2. Features
Additionally, the oscilioscope 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. Tt displays clear readable
traces cven at high sweep speeds. Internal graticule lines eliminate
parallax-viewing crror 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) 20MI1z 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 te 20MHz.
4) TV triggering
Exciusive TV sync separator circuit technology provides stable TV
signal measurements on fields, frames and lines.
3) 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.
{(r08-6112 OSCILLOSCOPE
USER MANUAL
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6) Trigger signai output
The signal selected by the TRIGGER SOURCE is available. This
output may be used to connect to a frequency counter or other
Instrument.
7) Panel setups lock
To avold unintentional touch of the setting, the feature is extremely
uscful for long term and repetitive measurements that used to be
performed under the same test condition of the oscilloscope setting,
8) LED indicator and buzzer alarm
The LEDs located in the front panel assist operation and indicated
additional information. Incorrect operation and ithe electrical end
position of control knobs are indicated by a warning beep.
9) SMD manufacturing technology
The instrument 1s built by using the most advanced SMD technology so
as 1» reduce the number of internal wiring and shorten the fol route on
the pc board. This will also greatly increase the high frequency
performance and the reliability of the product.
GOS-6112 OSCILLOSCOPE
USER MANUAL
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2. TECHNICAL SPECIFICATIONS
Sensitivity
2mYy-5Y/DIY,I1 step in 1-2-5 sequence
Sensitivity Accuracy
—
3% (5 DIV at the center display )
Vernier Vertical Sensitivity
Continuously variable to 172,5 or less than panel- |
indicated value
Frequency Bandwidth(-3d8 }
De - 100MEZ (2m Y/DiV:DC — 20MHz)
Rise Time
3.505 (2mY/DIY:17 55)
VERTICAL [Signal Delay Leading edge can be monitored
Maximum Input Voltage 400Y (DC+AC) at 1kHz or less
DEFLECTION (Input Coupling AC, DC, GND
Input Impedance IM (3=2% #/ 25pF approx.
SYSTEM Vertical Modes CHI1,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) CH? only
Bandwidth Limited 20MHz
Common-mode
Rejection Ration 50:1 or better at 50kHz
Dynamic Range 5 div at 60MHz, 5 div at 100MHz.
Trigger Modes AUTO, NORM, TV
Trigeer Source CHI. CH, LINE, EXT
Trigger Coupling AC, DC, HFR, LFR
Trigger Slope +/- polarity or TV sync polarity
Mode Frequency INT EXT
AUTO 10Hz-20MHz D.3SDIY| SOmvpp
TRIGGER В 20MHz—100MHz 1.$DIV| 150mVpp
Trigger Sensitivity NORM | DC-20MHz 0.35DIV|__50mVp
SYSTEM 20MHz7-100MHz 1 4DIV 150mVp
TV Sync signal IDIV|_ 200mVp
Trigger Level Range INT :+4 DIY or mare
> EXT :+0d4 Y or more
TV Syne TV-V TV-H
Max. External Input Voltage|300Ÿ (DC + AC peak) at | kHz
[External Input Impedance — (IMEI 5% //25pF approx.
GOS8-6112 OSCILLOSCOPE
USER MANTAL
HORIZONTAL
DEFLECTION
Harizontai Modes
MAIN(A), ALT, DELAY(B)
À (main) Swcep Time
50n5~0.35/D1V, continuously variable
(UNCAL)
B (delay) Sweep Time
SOnS~50mS/DIV
Accuracy
+ 3% (+ 5% at * 10 MAG)
Sweep Magnification
x 10 (maximum sweep time $nS/DIV)
Hold Off time Variable
SYSTEM Delay Time lu$-55
Delay Jitter 1720000 or less
Alternate Separation Vartable
X-axis, Y-axis selectable
Mee X-axis: CH1, CH?> 2mY-5Y/DIY £ 3%
X.Y Sensitivity Accuracy EXT > 0.1V/DIV = 5%
Y-axis: CH1,.CH2> 2mY-3 Y/DIVY + 3%
OPERATION — |X-axis Bandwidth DC-500kHz (-3dB)
Phase Error 3° or less at DC~50kHz
Cursor Measurement Function] A V. AVY AVIB, AT VAT ATH A В.
Cursor Resolution ¿100 DIV
Effective Cursor Range Vertical: + 3 DIV; horizontal: + 4 DIV
CURSOR Panel setting Vertical: V/DIV (CHI, CH2),UNCAL, ADD,
EFADOUT INV. PLO, AC/DC/GND.
FUNCTION Horizontal: S/DIV (MTB, DTB), UNCAL
x 10MAG, Delay time, Hold-off.
Trigger: Source, Coupling, Slope, Level,
TV-V/TV-H.
Others: X-¥, LOCK.
é-inch rectangular type with internal graticule
Type 0%, 10%, 90% and 100% markers.
CRI 8 x 10 DIV (1 DIV = 1 em}
Phosphor P31
Accelerating Potentral 12KY approx.
External mtensity modulation
Coupling DC
L-AXIS Voltage 5V or more
INPLT Maximum Input Voltage 30Y (DC+AC peak) at LkHz or less
Bandwidth
DC-3MHz
{05-6112 OSCILTOSCOPE.
USER MANLAL
TRIGGER Voltage 23mV/DIV approx. in 50¢] termination
SIGNAL Frequency Response DC—10MHz
OUTPLT Output Impedance 3052 approx.
, e Waveform IkHz + 55%, squaré wave
OUTPUE TOR Voltage 2Vpp = 2%
Impedance 2k) approx.
SPECIAL |
FUNCTION Panel Setups Lock Provided
F Г + 0 =
LINE POWER — Voltage AC 100V_120V, 230V + 10% selectable
REQUIREMENT [ETÉGREnCy ЗОН ог 6012
Power Consumption Approx. SOYA. 70 Wimax.)
Indoor use
Altitude up 10 2000 m
Ambient temperature
OPERATING To salisty specifications : 10% to 33 (309 to 95%)
ENVIRONMENT | Maximum operating ranges: 0° to 40°C ( 32 "to L104"F)
Relative humidity 85% RH(max.) non condensing
Installation Category 11
Pollution degree 2
STORAGE
TEMPERATURE [-10°10 707, T0%RH{maximum)
& HUMIDITY
MECHANICAL ¡Dimensions 310 W = 150 H x 455 D (mm)
SPECIFICATION |Weight Approx. 9kgs (19.8 lbs)
Power cord... 1
ACCESSORIES [Instruction manual............... 1
Prehc (X 17X 10... 2
(308-6112 OSCILLOSCOPE
USER MANUAL
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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 selecior of th. va? panel 15 set to the correct position
corresponding to the line voltage. It might he damaged the instrument 1f
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 90-110V
ov 108-132v | T1A2S0V | 230V |207-250V | T0.4A 250V
WARNING. To avoid personal injury, disconnect the power
cord before removing the fuse holder.
GOS-6112 OSCILLOSCOPE
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 praper ventilation for the vents in the oscilloscope case. If
this 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
long time.
leave the spot stay for an unreasonably
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
CHI, CH2, inputs
400\ (DC + AC peak)
EXT TRIG input
400V (DC + AC peak)
Probe inputs
Z AXIS input
600V (DC + AC peak)
30V (DC + AC peak) |
maximum input voltage of 1 kHz the frequency to the instrument
} CAUTION. To avoid instrument damage, de not apply exceeding
GOS-6112 OSCILLOSCOPE
USER MANUAL
ZOO а
4. PANEL INTRODUCTION
After the instrument is switched on, all the important settings are displayed
in the readout. The LEI}’s located on the front pang] 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), 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 control
Input connectors
GOS-6112 OSCILLOSCOPE
USER MANUAL
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Front panel of GOS-6112
GO5-6112 OSCILLOSCOPE
USER MANUAL
4-1.Front Panel
Display controls
The display controls adjust the on-screen appearance of the waveform and
provide a probe compensation signal source,
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(1) POWER - Pushbutton and symbols for ON([) and OFF(0).
When switch on the oscilloscope to have all LEDs lighted and the
software version will be displaved 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 - 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.
he TRACE/READOUT pushbutten 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 INTEO" — “TRACE INTEN”
GOS-6112 OSCILLOSCOPE
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). CAL
The terminal provides a reference signal of 2Vp-p at 1kHz for probe adjustm
Vertical controls
The vertical controls select the displaved signals and control the amplitude
characteristics.
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GOS-6112 OSCILLOSCOPE
USER MANUAL
- - -_-_—_-_-_-_ -_ _ —_ — —_— _—_ _ _—_—_—————_m_—",
(7).20MHz BWL — Pushbutton with indicator LED.
Briefly pressing the pushbutton, the bandwidth is reduced to approx.
20MHz, and the measurement 18 made by climinating undesired high
frequency signal from the wave orm Also the high frequency
component over 20MHz 1s eliminat. fro nthe tngger ste ''
(8) CURSOR FOS - AVLI/2 — Pushbutton with double function nd
associated indicator LED.
The function of Cursor Position or CH1/CH2 Position can be selected
only after the pushbutton cf 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 CURSOR 2 POSITION control.
AY E
The function is required and available only in DUAL mode in
combination with AY (Voltage) measurement. Pressing and holding
the pushbutton, then switch between CHI and CHZ, the measured
result will be displayed by the readout with “AVI...” or “AV2..."
providing the defection coefficient is calibrated. The settings of the
cursors must be related to the signal of the selected channel.
(5).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 CURSCR 2 position control in cursor
measurement mode. In alternate time base mode, this control knob
can be used to scparatc the DELAY time basc trace from the MIAN
time base trace, Please note TRACE SEP (11).
— 13 —
GO5-5112 OSCILLOSCOPE
USER MANUAL
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(11YTRACE 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 1s 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 arc required and available
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 ] and channel 2 and vice versa.
CHOP Indicates chopper mode.
The channel switching occurs constantly between channel 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°.
GOS-6112 OSCILEOSCOTE
USER MANUAL
J
(13)CH1 VOLTS/DIV.
(14)CH2 VOLTS/DIV- Control knob for channel l/channel 2 has double
function.
Turning the knob clockwise to increase the sensitivity in 1-2-5 sequence
and turning it in the opposite direction (CCW) to decrease. The
available range is from 2mVidiv up to 5V/div. The knob is
automatically switched inactive if the related channel is switched oft.
The deflection coefficients and additional information regarding the
active channels are displayed in the readout.
ie. “CH I=deflection coefficient, input coupling”. The “=" symbolizes
calibrated measuring conditions and is replaced by the “>” symbol in
uncalibrated conditions.
(15)CH1-VAR.
(16\CH2-VAR — Pushbution with double function.
CHECH2
Pressing briefly the CH1(CH2) button to set the cannel 1 (channel 2) of
the instrument on, the deflection coefficient will be displayed in the
readout indicating the current conditions (“C1I1...7/ “CH2...”).
VAR
Pressing and holding the pushbutton to select the VOLTS/DIV function
between attenuator and vernier (variable). The current setting is
displayed by the “>” symbol in the readout.
After switching on the VAR, turn the VOLTS/DIV control knob
counterclockwise to reduce the signal height. and the deflection
coefficient becomes uncalibrated.
GOS-6112 OSCILLOSCOPE
USER MANUAL
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(17)CHI AC/DC.
(18)CH2 AC/DC
Pressing the pushbutton briefly to switch over from AC (~ symbol) ta
DC {= symbol) input coupling. The seiting 15 displayed in the readout
with the deflection coefficient.
(19)CHI GND- Px 10
(20CH2 GND — PX 10 -Pushbutton has two functions.
GND
Each time when the pushbutton is pressed bricfiy, the input. of the
vertical amplifier is grounded, It is displayed in the readout as an earth
(ground) symboi “ 74”,
PX10
Pressing and holding the pushbutton to select the indicated deflection
coefficient of the channel displayed in the readout between 1:1 and 10:1.
The probe factor of 10:1 is displayed in the readout with the probe
symbol in front of channel indication (e.g. “P10”, CHI) When proceed
cursor voltage measurement, the probe factor will be automatically
included. The symbol must not he activated unless a 10:1 attenuator
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(08-6112 OSCILLOSCOPE
USER MANUAL
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Horizontal controls:
The horizontal controls select the time base operation mode and adjust the
horizontal scale, position and magnification of the signal.
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(ZDTIME/DIV- Control knob with double function.
Tuming the knob clockwise to reduce the deflection coefficient in a
1-2-5 sequence and turning it in the opposite direction (CCW) to
increase, The time coefficient(s) will be displayed in the readout.
In MAIN time base (MTB) mode, time deflection coefficients between
0.5s/div and 50ns/div can be chosen in 1-2-5 sequence, 1f the 10
MAG [function is not activated.
During alternate (ALT) and DELAY time base (DTB) operation, the
control knob changes the DELAY time base setting in 1-2-5 sequence.
The available deflection coefficient range is from 50ms/div up to
SOns/div (without =10 MAG), but the availability depends on the
MAIN time base setting. The internal control of the oscilloscope
prevents the DELAY time deflection coefficient from becoming higher
than the MAIN deflection coefficient. as such an eperation condition
wanld mate no sense.
GOS-6112 OSCILLOSCOPE
USER MANUAL
COC ZZ >
(22)\MAFN/ALT/DELAY—X-Y — Pushbutton for time base mode
selection.
The instrument contains two-time base designated MAIN and DELAY.
With the aid of the DELAY time base, signal parts displayed by the
MAIN time basc can be expanded in X-direction. The expansion ratio
depends on the time deflection coefficient ratio of both time bases (ie.
“MTB=0.1ms”, “DTB=1 ¿2 57=100). With higher expansion ratio the
DELAY time base trace intensity reduces. Each time when press the
pushbutton briefly, the time base mode changes in the sequence of
MAIN-ALT-DELAY-MAIN. The actual setting is displaved in the
readont.
MAIN
The TIME/DIV control knob is operated only under the MAIN time
base mode. The readout then displays the main time coefficient alone.
The time base setting for this condition will be stored if the time base
mode is changed.
ALT
If the alternate time base mode is selected, the TIME/DIV knob only
controls the DELAY time base switch. The alternate time base mode 15
a sub-function of the DELAY time base mode and both time base
traces can be displayed simultaneousty. Consequently the readout can
display both time deflection coefficient. A window sector which
indicates part of signal is also visible on the MAIN trace and is
displayed by the DELAY time base.
The window segment can be shifted horizontally by the DELAY TIME
coniral continuously. The difference between the beginning of both the
MAIN time base trace and the window sector shows the delay time.
The information is also displaved in the readout with an approximate
value (ee. “DLY=0.125ns") related to the calibrated MAIN time
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GOS-61 £2 OSCILLOSCOPE
[USER MANUAL
EE CT a EE
coefficient (uncalibrated ie. “DLY>0.125ms”) The width of the
window segment decreases when the DELAY time coefficient is set to
a lower value (higher time deflection speed).
For better reading, the vertical position of the DELAY time base trace
position can be shifted (please note TRACE SEP (11)).
DELAY
In the DELAY time base mode, the display of the MAIN traces, the
window sector and the MAIN time coefficient will disappear from the
readout. As the trace separation is no longer required under the
circumstances, the function would be switched off too. Consequently,
only the DELAY timc coefficient is displayed by the readout.
X-Y
Switch on or off the X-Y mode by pressing and holding the button. ln
the X-Y mode, the deflection coefficient is displayed in the readout
The Y axis input is selected by selling the vertical mode pushbutton to
the CHI, CH2 and both modes, and the X axis input is selected by
setting the TRIGGER SOURCE pushbutton to the CHI, CH2 and EXT.
(23)H POSITION
The control knab enables a horizontal position shift of the signals. In
combination with x10 MAG the function makes it possible to shift anv
part of the signal on the screen.
(24)x*10 MAG—SETUPS LOCK— Fushbutton has double function and
associated MAC LED,
Each time when this pushbutton is pressed, the MAG LED located
above will be switch on or off, If the MAG LED is lighted, the signal
display in all time base modes will be expanded 10 folds and
consequently only a tenth part of the signal curve 1s visible. The
interesting part of the signal can be made visible with the aid of the H.
POSITION control.
GOS-6112 OSCILT OSCOPE
USER MANUAL
ET Es
SETUPS LOCK
Pressing and holding the pushbutton, then switch the panel setups lock
function en or off. To avoid unintentional touch of the setting, the
feature is extremely useful for long term and repetitive measurements
that need to bc performed under the same test condition of the
oscilloscope setting.
(25) YAR
Pressing and holding the pushbutton to select the TIME/DIV (21)
control knob function between time base switch and vernier (variable).
The variable function is activated in the MAIN time base only.
After switching on the VAR, the time deflection coefficient is still
calibrated until further adjustments are made. Turn the TIME/DIV (21)
control knob counter clockwise to increase the time deflection
coefficient (reduce the deflection speed) and the deflection coefficient
becomes uncalibrated. Instead of “A=10 g 5”, the readout then displays
“A>10 zs” indicating the uncalibrated condition. This setting is stored
if the instrument is switched to ALT or DELAY time base mode.
Switch off the VAR by pressing and holding the pushbutton of time
base mode again, then set the time deflection coefficient back into the
calibrated condition.
GOS-6112 OSCILLOSCOPE
USER MANUAL
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Trigger controls
The trigger controls determine the sweep start timing for both signal and
dual trace operation.
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(25)MODE — Pushbutton and indicator LEDs,
Pressing the pushbutton to select the trigger mode. The actual setting is
indicated by a LED.
Each time when the MODE pushbutton is pressed the trigger mode
changes in the seguence:
ATO—NML—TV—ATO
ATO (Auto)
Select the automatical mode, the sweep frec-runs will display a
baseline trace when there is no trigger signal or the frequency is below
10Hz. The setting of triggering level changed only when the TRIGGER
LEVEL control is adjusted to a new level setting.
GOS-6112 OSCILLOSCOPE
USER MANUAL
re ey
NML (Normal)
Select the normal mode, the input signal will trigger the sweep when
the TRIGGER LEYEL control is set within the peak-to-peak limits of
an adequate trigger signal. When the sweep is not triggered, no
baseline trace will be displayed.
it to the triggering circuit. The horizontal or vertical SYNC signals are
selected by TV-V/TV-H pushbutton. Please refer to the TV-V/TV-H
(31).
27)LEYEL—-Control knob
Turning the control knob causes a different trigger input setting
(voltage), and set to a suitable position for the starting of triggered
sweep of the waveform. An approximate tri gger level setting (voltage)
value will be displayed in the readout. When rotate clockwise the
control knob, the trigger point moves toward the positive peak of the
trigger signal and rotate it counterclockwise to move the trigger point
toward the negative peak of the trigger signal.
When the setting (voltage) value is out of the changing portion of the
observation waveform, the synchronization sweep stops. Sometimes a
“7” will be displayed on the left of the valued display, that indicates
that direct reading is impossible if AC, HFR, LFR coupling or VAR of
|
TY
Separate the video sync signal from the composite waveform and direct
vertical deflection is set,
[05-6112 OSCILLOSCOPE
USER MANUAL
——P — — _ — ___®
(28)COUPLING —Pushbutton and indicator LEDs.
Pressing the pushbutton to select the trigger coupling. The aclual
setting is indicated by a LED and by the readout (“source, slope, AC”).
Each time when the COUPLING pushbutton is pressed the trigger
coupling changes in the sequence:
AC—DC—HFR—LFR
AC
Attenuates trigger signal frequency components below 10Hz and
blocks the DC component of the signal.
AC coupling is useful for triggering on AC waveforms that have a
large DC offset.
DC
Couples DC and ali frequency components of a triggering signal to the
trigger circuitry.
DC coupling 1s useful for most signals, especially for providing a
stable display af low-frequency or low-repetition-rate signals.
HFR (High Frequency Reject)
Attenuates high-frequency triggering signal components above 40kHz.
HFR coupling is useful [or providing a stable display of low-frequency
components of complex waveforms and eliminates high-frequency
interference from the trigger signal.
LFR (Low Frequency Reject)
Attenuates low-frequency triggering signal components below 40kHz
and blocks the DC component of the trigger signal.
LFR coupling 1s uscful for producing stable triggering on the high-
frequency components of complex waveforms and rejecting low-
frequency interference or power supply hum from the trigger signal.
GOS-6112 OSCILLOSCOPE
LISER MANUAL
р
(29)SOURCE—Pushbutton and associated LEDs.
Pressing the pushbutton to select the trigger signal source or the X
signal for an X-Y operation. The actual setting is indicated in a LED
and by the readout (* SOURCE”, slope, coupling).
CHI
The signal applied to the channel 1 input connector is the source of
the trigger signal.
CH2
The signal applied to the channel 2 input connector is the source of
the trigger signal.
, (Line)
The triggering signal is obtained from a sample of the AC power
source waveform. The trigger source is useful when the displayed
waveform frequency is time related to the AC power source
frequency.
EXT
The external signal applied through the EXT input connector 1s used
for the external triggering source signal. When in the dual X-Y
operation, the X-axis operates with the external signal.
GOS-61 [2 OSCILLOSCOPE
USER MANUAL
—Bgo oOoOo:sqOAO3IE $ — E [—
(30)DELAY-HO— Control knob with a double function and associated
LED.
The control knob has two different functions depending on the time
base mode.
HO (Hold-off time)
In MAIN time base mode, the control knob applies to the hold off
time setting, the HO-LED associated with the knob is dark, the hold
off time is sel to minimum.
Switch on the LED by turning the control knob clockwise and extend
the hold off time until the maximum is reached. An approximate hold
off time value will be displayed in the readout (HO: — %”).
The hold off time is automatically set to minimum (LED is dark), if
the MAIN time base setting is changed. The hold off time setting is
stored and deactivaled if ALT (MAIN and DELAY) or DELAY time
base mode is selected,
DELAY TIME
In ALT (MAIN and DELAY) and DELAY time mode, the knob
controls the delay time setting.
Under the ALT time base mode, the delay time is visible on the main
trace, beginning at the trace start and ending at the start of the
window sector. An approximate delay time value will be displayed in
the readout (“"DLY=").
If only select DELAY time base, the delay time can also be varied,
but there would be no window sector as the main trace is not visible.
GOS5-6112 OSCILLOSCOPE
USER MANUAL
— ooo —————————;———;—
(31)TY-V/TY-H-— Pushbutton for video sync signal selection.
TV-V
Start the main trace at the beginning of a video signal field. SLOPE
polarity must match the composite sync polarity (i.e, “== for negative
sync) to obtain TV field triggering on the vertical sync pulse.
TV-H
Start the main trace at the beginning of a video signal line. SLOPE
polarity must match the composite sync polarity to obtain TV line
triggering on the horizontal sync pulse.
The current setting is displayed in the readout under item “Source,
video polarity, TV-H*,
(32)SLOPE ( y 7 }—Pushbution for the triggering slope or video
polarity selection.
If in the AUTO or NML trigger mode, bricfly pressing the pushbutton
to select the slope of the signal which is used for triggering the time
base generator. Each time when the pushbutton is briefly pressed, the
slope direction will switch from falling edge to rising edge, and vice
YETSA.
The current setting is displayed in the readout under item “source,
SLOPE, coupling”,
If in the TV trigger mode, bricfly pressing the pushbutton to select the
video polarity, which will be displayed in the readout with a “—”
symbol of positive video signal and a “— symbol of negative video
signal.
GOS-6117 OSCILLOSCOPE
USER MANUAL
—————————]———]].[D)[ E ——— ОА Инин
Measurement Control
The measurement section controls the cursor measurement.
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(33)CURSOR FUNCTION-ON/OFF-—Pushbution with two functions.
ON/OFF
Pressing and holding either pushbutton to switch both cursor lines on
or off. As the cursor lines are part of the readout, they are visible only
when the readout is switched on.
CURSOR FUNCTION
Each time when the pushbutton is briefly pressed the seven
measurement functions will be selected in the sequence as below:
AY Voltage difference measurement.
ANS : Voltage difference percentage measurement
(3div=100% reference)
AYdB Voltage gain measurement.
{Sdiv=odB reference, /AVdB=20 log, div/5div).
AT : Time différence measurement.
1/AT Frequency measurement.
AT% Time difference percentage measurement,
(3div=100% reference).
Аб Phase measurement.
(ádiv=350" reference).
GOS-6112 OSCILLOSCOPE
USER MANUAL
Input connectors
The input section is where the input signals are commonly connected to
the oscilloscope.
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(35)CHI—Input BNC socket
This BNC socket is the signal input for channel 1. In X-Y mode,
signals at this input are used for the Y or X deflection. The outer
(ground) connection is galvanically connected to the instrument
ground and consequently to the safety earth contact of the line/mains
plug.
(36)CH2—Input BNC socket
This BNC socket is the signal input for channel 2. In X-Y mode,
signals at this input are used for the X or Y deflection. The outer
(ground) connection is galvanically connected to the instrument
ground and consequently to the safety earth contact of the line/mains
plug.
(37)Ground socket—Banana Socket galvanically connected to safety
earth,
This socket can be used a reference potential connection for DC and
low frequency signal measurement purposes.
(05-6112 OSCILLOSCOPE
USER MANUAL
д
(38)EXT—This BNC socket is the external trigger signal input.
In dual X-Y mode, signals at this input are used for the X deflection.
Pressing the TRIG. SOURCE (29) pushbutton until the information of
“EXT, slope, coupling” is shown up in the readout and the TRIG.
SOURCE “EXT” LED is lighted, switches the input on.
The outer (ground) connection is galvanically connected to the
instrument ground and consequently to the safety earth contact of the
line/mains plug.
The maximum input voltages of the instrument input terminals and probe
input terminals are listed in the section of 3-6.Withstanding voltage of
[nput terminals”. Do not apply voltage higher than the limit.
505-6112 OSCILLOSCOPE
USER MANUAL
4-2.Rear Panel
The rear panel provides input power and additional signal connections.
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(39)Line voltage selector and input fuse holder —Select power source
and contain the primary power fuse
The fuse rating 15 shown in the section of 3-2 Checking the line
voltage.
(40)AC power input connector
Connect the AC power cord to the power supply of instrument, the
power cord protective-ground connection is connected to the exposed
metal part of the instrument. The power cord must be connected to a
proper grounded source for electrical-shock protection.
(4 TRIGGER SIGNAL Output—BNC socket
The signal selected by the TRIG. SOURCE (29) is available. This
output may be used to connect to a frequency counter or other
instrument.
GO5-6112 OSCILLOSCOPE
USER MANUAL
yr re Em
(42)Z-Axis Input —BNC socket
Connect external signals to the Z-axis amplifier for intensity
modulating the CRT display. This terminal is DC-coupled. The
intensity is lowered by a positive signal, while it is increased by a
negative signal.
GOS-6112 OSCILLOSCOPE
USER MANUAL
—— A re
>. OPERATION METHOD
This section contains basic operation information and techniques that
should be considered before proceeding any measurement. As for the
location and function of instrument controls, connectors, and indicators,
refer to the “Instruction of Front Panel and Rear Panel” of this manual,
5-1.Readout Display
The CRT readout display indicates how to set up the instrument controls.
No physical marking shown on the rotating switches indicates the control
setting. A key to the location and type of readout information displayed is
Hlustrated in figure 5-1:
GOS-6112 OSCILLOSCOPE
USER MANUAL
DELAY TIME BASE
Ss Dv
MAIN TIME BASE — DELAY TIME —— © HOLD OFF TIME - -
si CH YALUE VALUE %
MEASUREMENT PANEL SETJFS |
ХО МАС FUNCTION AND LOCK SYMBOL |
VALLE
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1 — VERT MODE
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TI ADD
— TRIG LEVEL
10— - UNKNOWN SYMBOL 7?
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CHA CH2 TRIG SOURCE TRIG LEYEL
PROBE X1C PROZE X10 CH! VALJE
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CAL = CAL - Ro
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CH1 — сна — 1 |
VOLTS/DIV VOLTS/D V | YE ARITY
CH1 . A HZ — | TRIG COUPLING — _
Ih PLT COUPLING INPUT COUPLING AC
AS: fy AC. Ny DC
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or TY SYNC
Ty Figure 3-1
TV-H
08-6112 OSCILLOSCOPE
USER MANUAL
-— —_ —_ "—_—_—_—_—_“A——#".,
5-2.Connecting Input Signals
Grounding
The most reliable signal measurements are made when the oscilloscope
and the unit under test are connected by a common reference (ground lead)
in addition to the signal lead or probe. The ground lead of the probe
provides the best grounding method for signal interconnection and
ensures the maximum amount of signal-lead shielding in the probe cable.
A separate ground lead (with a banana plug) can also be connected from
the unit under test to the oscilloscope ground jack on the front panel.
Probes
A probe provides the most convenient way to connect an input signal to
the oscilloscope. The standard x1/<10 probes supplied to the oscillascope
are shielded agamst electromagnetic interference and have a high input
impedance for low circuit Joading.
CAUTION. To get the best waveform precisely, keep
probe ground and signal leads as short as possible.
Misadjust probe compensation can cause measurement error. Check and
adjust probe compensation whenever a probe is moved to a different
channel or oscilloscope. As for the probe compensation adjustment
procedure, refer to the “Probe Compensation”.
Coaxial Cables
Signal input cable can greatly affect the accuracy of a displayed
waveform, To maintain original frequency characteristics of the input
signal. use only high-quality, low-loss coaxial cables. Coaxial cables must
be terminated at both ends in their characteristic impedance fo prevent
signal reflections within the cable. Use suitable impedance-matching
devices.
(008-6112 OSCILLOSCOPE:
USER MANUAL
"ECO,
5-3. Adjustments and checks
Trace Rotation Adjustment
Normally, when the trace is in parallel with the center horizontal graticule
line, there will be no need to adjust the TRACE ROTATION. If necessary,
adjust the TRACE ROTATION to make the baseline trace parallel to the
center horizontal graticule line by using a small straight-blade screwdriver
or alignment tool.
Probe Compensation
To minimize the distortion of measured waveforms, check the
compensation of your probes before using them. The probe compensation
should be checked pericdically whenever the probes are moved to
different input channels,
1. Install the probes onto the oscilloscope (Press the BNC connector onto
the channel input and rotate the connector to lock it into place).
2. Set the probe slide switches to the x10 position.
3. Briefly pressing the CH1/CH2 button to set the oscilloscope to channel
| and channel 2.
4. Pressing and holding the P-10 button to set the indicated deflection
coefficient of the channel displayed in the readout as a symbol “P10”,
5. Attach the probe tips to the CAL connection in the front of the
oscilloscope.
6. Set the oscilloscope controls to display both channels:
VERTICAL: VOLTS/DIV 1V
COUPLING DC
ALT/CHOP/ADD CHOP
HORIZONTAL: MODE MTB
TIME/DIV 0.3ms
TRIGGER: MODE ATO
SOURCE CHI or СН2
COUPLING AC
SLOPE LL
—GOS-5117 OSCILLOSCOPE
USER MANUAL
"HI _ -— ———_—-—_—_m————
7. Observe the displayed waveform and compare them with the waveforms
shown in figure 5-2. If either probe needs to be adjusted, proceed the
step 8. If either probe does not need to be adjusted, proceed the
“Function Check”.
Cver compensated
| | | | Under compensated
| | | | Correctly compensated
Figure 5-2 Typical Compensation Waveform
8.Adjust the probe by using a smal! insulated screwdriver. Slowly rotate
the adjustment control until the probe is properly compensated.
GOS-6112 OSCILLOSCOPE
USER MANUAL
TE АО ОЕ ДОН оО ОНО АО НИЕ
5-4. Function Check
When vou start to check the operation of your oscilloscope, proceed the
following instruction:
|. Install the x10 probes onto CHI and CHZ inputs.
2. Connect the probe tips to the CAL test point of the oscilloscope.
3. Set the oscilloscope controls to display both channels:
VERTICAL: VOLTS/DIV iv
COUPLING DC
ALT/CHOP/ADD CHOP
HORIZONTAL: MODE MTB
TIME/DIV 0.5ms
TRIGGER: MODE ATO
SOURCE CHI or CH?
COUPLING AC
SLOPE LL
The figure 5-3 below illustrates a satisfactory display. The waveform
should be approximately 2Vp-p at a frequency of 1kHz that confirms
the vertical and horizontal deflection function of the oscilloscope.
—
-
+
+
=
ALT CHI FAC
Figure 5-3 Display 1
— 37 —
(105-6112 OSCILLOSCOPE
USER MANUAL
"WE ZZ en:
4. Set both CH1 and CH2 COUPLING to GND.
3.Use the CHI and CH2 POSITION controls to align both traces on the
center graticule.
6. Open the CH2 INV by pressing and holding the pushbutton.
7.5¢t to the ADD mode by pressing the ALT/CHOP/ADD pushbutton
briefly.
8. Set both CITI and CH2 COUPLING to ОС.
9. The figure 5-4 below shows a satisfactory display. The display will
show a flat trace located on the center gracticule that confirms the
channel balance and ADD offset function.
NEN
| |
CHI=1Y ее ALT CHI fat
Figure 5-4 Display 2
10. Set to the CHOP mode by pressing the ALT/CHOP/ADD pushbutton
briefly.
I'l. Turn off the CH2 INV by pressing and holding the pushbutton,
GOS8-6112 OSCILLOSCOPE
USER MANUAL
————— zz U.
5-5.Basic Operation
Displaying CH1 or CH2
To display the signal from a signal channel, pressing briefly the CHI or
CH2 pushbutton to set the oscilloscope to channel ! or channel 2.
Displaying CHI and CHZ
To display both signals ar the same time, proceed the following steps:
1 Set the CH! and CH2 on. The figure 5-5 below shows two synchronous
waveforms in the both modes.
2.Adjust the CHI or CH? POSITION control to position the two
waveforms.
3.Set the ALT/CHOP/ADD button to CHOP mode if the waveforms are
flickering.
J AC
Figure 5-5 Both typical waveforms
GOS-6112 OSCILLOSCOPE
USER MANUAL
Ee ye en
Displaying the sum or difference of CHI and CH?
To display the algebraic sum or difference of CHI and CH?2, proceed the
following steps:
1.Set the ALT?CHOP/ADD button to ADD mode. The figure 5-6 below
shows the sum of the waveforms from figure 5-5.
2.Set the CH2 INV on by pressing and holding the button, if necessary, to
display the different waveform,
3. Pressing and holding one of the VAR buttons to set the VOLT/DIV
control knob to vernier (variable). Then adjust one channel to the other
in the event of gain difference.
AC
Figure 5-6 Typical ADD waveform
GOS-6112 OSCILLOSCOPE
USER MANUAL
"EE 2222 EE
Comparing Frequency and phase (Single X-Y Operation)
To compare the frequency and phase between two signals by using the
X-Y mode. The X-Y waveform displays different amplitude, frequency,
and phase. The figure 5-7 shows a typical waveform made up of two
signals that are of the same frequency and amplitude, but approximate
45° out of phase.
To use the oscilloscope in the signal of X-Y mode, proceed the following
steps:
|. Connect the horizontal or X-axis signal to the CHI input.
2 Connect the vertical or Y-axis signal to the CH2 input.
3.Set the CHI off, and set the CH2 on.
4,5et the X-Y mode on by pressing and holding the button.
5.Set the TR1G SORCE button to CHI.
Use the HORIZONTAL POSITION control to adjust the X-axis.
Note: When high frequency signals are displayed in the X-Y
operation, note the frequency bandwidths and phase difference
between X and Y axis. Refer to “2. SPECIFICATION" section for
details.
Figure 5-7 Typical single X-Y display.
— 41 —
GOS-60117 OSCILLOSCOPE
USER MANUAL.
es
Setting up Dual X-Y Operation
To use the oscilloscope in the dual X-Y mode, proceed the following steps:
[. Connect the horizontal or X-axis signal to the EXT (X) input.
2.Connect one of the vertical or Y-axis signal to the CHI (Y E) input.
3.Connect either of the vertical or Y -axis stgnal to the CH? (Y?) input.
4.5ct the CHI and CIR on.
5, Set the ALT/CHOP/ADD button to CHOP mode.
6.Set the X-Y mode on by pressing and holding the button.
The figure 5-8 shows two X-Y waveforms in the dual X-Y mode.
Figure 5-8 Typical dual X-Y display
Setting Up delayed-sweep Operation
A delayed sweep is used to magnify any portion of a complex waveform
En the horizontal direction.
lo display the delayed sweep operation, proceed the following steps:
l. Briefly pressing the MAIN/ALT/DELAY pushbutton ta set to MAIN
time base of the horizontal mode. Effect triggering by main sweep and
set MAIN TIME/DIV control as desired.
GOS-6112 OSCILLOSCOPE
USER MANUAL
Е О_О
2.Set the MAIN/ALT?DELAY button to ALT mode, and sct the time
range of the DELAY TIME/DIVE control to be magnified.
The figure 5-9 below shows the man and deiaved sweeps appear
simultancously an the screen, and the window sector will appear.
3.Adjust the DELAY TIME control to move continuously the window
sector. Bring the window sector to the position te be magnified. Then,
the waveform between the window sector is magnified to occupy the
full area of the screen,
4.1{ necessary, press the TRACE SEP pushbutton to sct the LED on. The
delayed sweep trace can be shilted verticalty abont +3 divisions with
respect lo the main sweep trace for the convenience of observation by
the POSITION control.
Figure 5-9 ALT Mode Figure 5-10 Delay Mode
5 Set the DELAY mode to measure the magnified waveform only by
pressing the MAIN/ALT/DELAY button. The magnilied waveform
shown in figure 3-10.
GOS-6112 OSCILLOSCOPE
USER MANUAL
ree ene
Magnifying Waveform Events
Use the x10 MAG pushbutton to view small portions of a waveform as
which is too far back from the starting point to view by using the
TIME/DIV control. To use the x10 MAG button, proceed the following
steps:
1. Adjust the TIME/DIV to the fastest sweep that displays the event.
2.Rotate the HORIZONTAL POSITION control to move the event 19
display on the center of screen.
3. Press the x10 MAG button to switch the MAG LED on.
When above procedures have been done, the displayed waveform will be
expanded 10 times to the right and left from the center of screen as center
of expansion.
Operating HO (Hold off time) Control
When the measured signal is a complex waveform with two or more
repetition frequencies (period), triggering with the LEVEL control alone
may not be sufficient to attain a stable waveform display. In such a case,
the sweep can be stable synchronized to the measured signal waveform
by adjusting the HO (Hold off) time of the sweep waveform.
Figure 5-11(a) shows several different waveforms which overlapped on
the scrcen, marking the signal observation unsuccessful when the hold off
is set to minimum (the HO-LED is dark).
Figure 5-11(b) shows the undesirable portion of the signal is held off.
The same waveforms are displayed on the screen without overlapping,
GOS-6112 OSCILLOSCOPT.
USER MANUAL
EE
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ane displayed
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Figure 5-11(a)
Adpusting The :
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Figure 5-11(b)
Triggering of Video signal
In the work concerned with TV, complex signals and containing video
signal, blanking pedestal signal, and synchronizing signal are often
measured.
Press the TRIG MODE pushbutton to set the TV position. The built-in
active TV-Sync-separator provides the separation of frame or line sync
pulses from the video signal. To trigger the oscilloscope at the vertical
(frame) rate. press the TV-V/TY-H pushbutlon to set TV-V coupling. To
trigger the oscilloscope at the horizontal (line), press the TV-Y/TV-H
pushbutton to set TV-H coupling. The figure 5-12(a) shows vertical signal
of TV-V and Figure 3-12(b} shows horizontal signal of TY-l1.
— 45 —
GOS-6112 OSCILLOSCOPE
USER MANUAL
Figure 5-12(a) TV-V Figure 5-12(b) TV-H
The polarity of the synchronization pulse is critical for the slope selection.
The figure 5-13(a) and 3-13(b) shows the examples of TV polarity
synchronization signals.
A
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x
;
iden ;
signal
E
Syxchronimng y
Aina
Figure 5-13(a) (-) Sync signal. Figure 5-13(b) (+) Sync signal
GOS-5112 OSCILLOSCOPE
USER MANUAL
ee — — ]]—]]—»» -——]]]]Ó
3-6. Measurement Application
The oscilloscope has a cursor measurement svstem for making accurate,
direct-readout voltage, time, frequency and phase measurements. The
measurements described in this section arc examples of typical
applicalions using this measurement systèm. After becoming familiar with
the controis, indicators, and capabilities of the instrument, vou can
develop convenient methods to make the special measurement for Y CUT
own applications.
Froceed a measurement by using the cursor according to the following
steps:
1.
о
Pressing and holding the CURSOR FUNCTION-ON/OFF pushbutton
to turn on the cursor and measurement readout.
. Briefly pressing the pushbutton to select (he seven measurement
function in the sequence as below:
AV AVR —AVIB —AT — VAT — АТИ —A BG AV
. If the associated indicator CURSOR POS-LED is hghted, rotate the
CI-PGSITION control to position the cursor | and rotate the С2-
POSITION control to position the cursor 2.
- Read the measurement value on the screen. Typical measurement
readouts and applications are shown in Figure 5-14. The measurement
values arc automatically controlled bv the VOLTS/DIV and TIME/DIV
control seilings,
G0S5-6112 OSCILLOSCOPE
USER MANUAL
"EZ
Figure 5-14: Cursor Measuremeg
(a). Typical AV (Voltage difference) for AC
voltage,
When both CHI and CH2 are turned on, the
measurement value of CHICA YI) or
CH2(/ Y7) can be displayed by pressing and
holding the AV 1/2 pushbutton.
(b).Typical A Y%iVoltagc percentage) cursor
measurement for overshoot of square
waveform,
À vollage percentage measurement is done
by first sctting a reference for the full scale
(amplitude) waveform: 5div=10{0%.
(c). Typical A VdR(voltage gain) cursor
measurement for -3dD bandwidth
application.
The percentage reference is: 5div=Cdb.
The measurement values calculate the
voltage gain from the formula:
ES Y dB=20 log( À Vdiv/3div)
(d).Typical 2 T(Time difference) cursor
measurement for rise time.
Proceed rise-time or fail-time measurement
requiring some additional signal scaling by
using the graticale rise-time measurement aids.
Number 0%, 10, 90 and 100 arc etched near
the left vertical gratical line. Use the following
steps as a guideline to in making rise-time measurement:
— 48 —
GOS-6112 OSCILLOSCOPE
USER MANUAL
—s gs a ЗОО
1. Set the VOLTS/DIV and VAR controls to provide an exact five-
division vertical display.
FF
_ Use the vertical POSITION control to control the negative amplitude
of the signal on the 0% reference line and the positive amplitude on
the 100% reference line.
3. Increase the TIME/DIV setting to stretch out the rising edge of the
waveform as much as possible to improve the cursor placement
accuracy.
4. Use the C1-POSITION control to align the cursor 1 lo the rising
edge at the point where it crosses the 10% reference graticule Ine.
Then use the C2-POISITION control to align the cursor 2 to the
point where the rising edge crosses the 90% graticule line and read
the rise time displayed in the CRT readout.
(e). Typical 1/AT cursor function for frequency
measurement.
When the two cursors are superimposed at
two edge points of the one period waveform
by the C1-POSITION and C2-POSITION
controls, the measurement value is displayed
in frequency units on the upper side of the
SCrçèmt.
({.Typical A T%(Time difference percentage)
cursor function for duty-cycle measurement
of square waveform.
A time difference percentage measurement is
done by first setting a reference for the full
cycle of waveform period: 3div=100%.
— 49 —
GOS-61 12 OSCILLOSCOPE
USER MANUAL
(2).Typical A 9 cursor function for phase
measurement,
A phase measurement is done by first setting
a reference for the full 360° waveform period:
Idiv-366,
NOTE. When the VOLTS/DIV or the TIME/DIY controls are in
uncalibrated setting, the AY and AT measurement values will be
displayed with divisions.
When the vertical mode is set to the ADD mode, and the CHI and CH?
VOLTS/DIV controls are set to different scales, the AV measurement
values will be displayed with divisions.
G0OS-6112 OSCILLOSCOPE
USER MANUAL
6.MAINTENENCE
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 da so.
6-1.Fuse Replacement
I the fuse blows, the power lamp indicators will not light and the
oscilloscope will not start. The fuse should not normally open unless a
probiem has developed in the unit. Try lo determine and correct the cause of
the blown fuse and replace only with a fuse of the correct rating and type on
the rear panel.
WARNING. For continued fire protection. Replace fuse
only with 250% 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 tanped to permit operation
from 100, 120 or 230VAC 50/6011z line voltage. Conversion from one line
voltage to another is done by changing the line voltage selector switch as
shown in page 7. The rear panel identifics 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 selecior 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.
— 5] —
GOS-6112 OSCILLOSCOPE
USER MANUAL
"EC tee ep
6-3.Cleaning
le clean the oscilloscope. use a soft cloth dampened in a solution of mild
detergent and water. Do not spray cleaner directly onto the oscilloscope
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.
GOS-6112 OSCILLOSCOPE
USER MANUAL
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