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200MHz Readout Oscilloscope
GOS-6200
User Manual
Good Will Instrument Co., Ltd.
G W Part No. 820s-62HOOMB
Printed in Taiwan September 200 1
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All Rights Reserved
This manual contains proprietary information, which is protected by copyrights. All rights are reserved. No part of this manual may be photocopied, reproduced or translated to another language without prior written consent of Good Will company.
The information in this manual was correct at the time of printing.
However, Good Will continues to improve products and reserves the rights to change specification, equipment, and maintenance procedures at any time without notice.
Good Will Instrument Co., Ltd
No. 95- 1 1, Pao-Chung Road, Hsin-Tien City, Taipei Hsien, Taiwan
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GOS-6200 OSCILLOSCOPE
USER MANUAL
CONTENTS
1
PAGE
.
PRODUCT INTRODUCTION
.................................................
1
1.1.Description
.......................................................
1
1.2.Feature
.............................................................
2
2
.
TECHNICAL SPECIFICATIONS
..........................
4
3
.
PRECAUTIONS BEFORE OPERATION
......................
8
3.1.Unpacking the instrument
......................................
8
3.2.Checking the Line Voltage
.....................................
8
3.3.Environment
.....................................................
9
3-IEquipment Installation and Operation
3.5.CRT Intensity
......................
....................................................
3.6.Withstanding Voltage of Input Terminals
..................
9
9
9
4
.
PANEL LNTRODUCTION
4.l.Front Panel
.........................................
10
.......................................................
12
4.2.Rear Panel
........................................................
34
5
.
OPERATION METHOD
5.l.Readout Display
...........................................
36
..................................................
36
5.2.Connecting Input Signals
5.3. Adjustment and Checks
......................................
38
..................................
39
5.4. Function Check
5.5.Basic Operation
..................................................
41
...................................................
43
5d.Measurement Application
.....................................
52
6
.
MAINTENANCE
...................................................
6.l.Fuse Replacement
56
...............................................
56
6.2.Line Voltage
6.3.Cleaning
......................................................
56
..........................................................
57
7
.
BLOCK DIAGRAM
................................................
58
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GOS-6200 OSCILLOSCOPE
USER MANUAL
SAFETY TERMS AND SYMBOLS
n
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 AlTENTlON Protective
High Voltage refer to ~ a n u a l Conductor
Terminal
Earth(ground)
Terminal
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GOS-6200 OSCILLOSCOPE
USER MANUAL
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:
Green/ Yellow:
Blue:
Brown:
Earth
Neutral
Live (Phase)
As the colours of the wires in main leads may not correspond with the colours marking identified in your plug/appliance, proceed as follows:
The wire which is coloured Green
&
Yellow must be connected to the
Earth terminal marked with the letter E or by the earth symbol
@ or coloured Green or Green & Yellow.
The wire which is coloured Blue must be connected to the terminal which is marked with the letter N or coloured Blue or Black.
The wire which is coloured Brown must be connected to the terminal marked with the letter L or P or coloured Brown or Red.
If in doubt, consult the instructions provided with the equipment or contact the supplier.
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GOS-6200 OSCILLOSCOPE
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This cable/appliance should be protected by a suitably rated and approved HBC mains fuse: refer to the rating information on the equipment and/or user instructions for details. As a guide, cable of
0.75mmz 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.
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GOS-6200 OSClLLOSCOPE
USER MANUAL
- - -
EC Declaration of Conformity
We
GOOD WILL INSTRUMENT CO., LTD.
(1) No. 95-1 1, Pao-Chung Rd., Hsin-Tien City, Taipei Hsien, Taiwan
(2) Plot 522, Lorong Perusaham Baru 3, Prai Industrial Estate, 13600 Prai, Penang, Malaysia declares that the below mentioned product
GOS-6200 is herewith confirmed to comply with the requirements set out in the Council Directive on the Approximation of the Law of Member States relating to Electromagnetic
Compatibility (891366/EEC, 92/31/EEC, 93168EEC) and Low Voltage Equipment
Directive (73123lEEC).
For the evaluation regarding the Electromagnetic Compatibility and Low Voltage
;
Zonducted and Radiated Emissions
EN 5501 1 class B: 1998
Current Harmonic
EN 61000-3-2. 1995
Voltage Fluctuation
EN 61000-3-3: 1995
I Electrostatic Discharge
EN 6 1000-4-2. 1995-
Radiated Immunity
EN 61 000-4-3 : 1996
Electrical Fast Transients
EN 6 1000-4-4: 1995
----------------
----------------
----------------
Surge Immunity
EN 61000-4-5: 1995
Conducted Susceptib~lity
EN 6 1000-4-6: 1996
Power Frequency Magnetic field
EN 6 1000-4-8: 1993
Voltage Dips/ Interrupts
EN 61000-4-1 1 : 1994
*'u8
&uipmentD&kfi+e
?5R9/EE3' &amended by 93168AZE1~
Safety Requirements
EN 61010-1: 1993+A2: 1995
IEC 6 10 10- 1 : 1 99O+A I : l992+A2: 1995
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GOS-6200 OSCILLOSCOPE
USER MANUAL
1.PRODUCT INTRODUCTION
1-1. Description
The GOS-6200 is a 200MHz, two-channel, dual-sweep, portable oscilloscope for general purpose use. A microprocessor-based operating system controls most of the functions of the instrument, including cursor readout and digitized panel setting. On-screen alphanumeric readout and cursor function for voltage, time, frequency and phase measurement provide extraordinary operational convenience. It also has the function of TV Line select for triggering setting, auto measurement for frequency, period, pulse width and duty cycle and auto setting function. Ten different user defined instrument settings can be saved and recalled without restriction.
The vertical deflection system has two input channels. Each channel has 1 1 basic deflection factors from 2mV to 5V per division. The horizontal deflection system provides single, dual or delayed sweeps from 0.5s to 20ns per division (delayed sweep, 50ms to 20ns per division). The trigger system provides stable triggering over the full bandwidth of the vertical deflection system.
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GOS-6200 OSCILLOSCOPE
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1-2.Features
Additionally, the oscilloscope offers several other features:
1) High intensity and internal graticule CRT
The oscilloscope employs a high intensity 6-inch retangular type cathode-ray tube with red internal graticule. It displays clear readable traces even at high sweep speeds. Internal graticule lines eliminate parallax-viewing error between the trace and the graticule line.
2) Temperature compensation
The oscilloscope uses a temperature compensation circuit to reduce the drift of base line and DC balance.
3) 20MHz bandwidth limit
When it is hard to observe or trigger a signal because a high-frequency component is superimposed on the signal, use the 20MHz BWL function to reduce the bandwidth of the vertical deflection system and trigger system to 20MHz.
4) Auto-setting
At a press of the AUTOSET button, an optimum time base range is automatically set to a corresponding change in input signal period. A signal period from 1.6 to 4 cycles, signal amplitude from 1-7 div approx. is displayed.
5) TV triggering
Exclusive TV sync separator circuit technology provides stable TV signal measurements on fields, frames and lines.
6) Z-axis intensity modulation
For applying a blanking signal from an external source. The trace displayed on the screen may be intensity-modulated where pulse signal or time-scale marks are required.
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GOS-6200 OSCILLOSCOPE
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7) Trigger signal output
The signai 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.
1O)SMD manufacturing technology
The instrument is built by using the most advanced SMD technology so as to reduce the number of internal wiring and shorten the foil route on the pc board. This will also greatly increase the high frequency performance and the reliability of the product.
1 1)Auto Measurement
A built-in 6 digits universal counter is accurate within the range of
1 0 . 0 % and can measure frequency between 50Hz and 200MHz.
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GOS-6200 OSCILLOSCOPE
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2.TECHNICAL SPECIFICATIONS
DEFLECTION
SYSTEM
Trigger Sensitivity
'RIGGER
YSTEM
TV-Line
election
Standard Field 1
TV Sync NTSC(525H)
3xternal Input Impedance I M R * 5%
1H-263H
PAL (625H)
]H-3 13H
SECAM(625H) vlax. External Input Voltage 400V (DC
+
AC peak) at I kHz
//
25pF approx.
Field 2
1 H-262H
1 H-3 12H
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GOS-6200 OSCILLOSCOPE
USER MANUAL
HORIZONTAL
DEFLECTION
SYSTEM
Y-Y
DPERAT1ON
CURSOR
READOUT
FUNCTION
Horizontal Modes
A (main) Sweep Time
B (delay) Sweep Time
Accuracy
Sweep Magnification
Hold Off time
Delay Time
Delay Jitter
Alternate Separation
Sensitivity Accuracy
MAIN(A), ALT, DELAY(B)
20ns-O.SsDIV, continuously variable
(UNCAL)
2011s-5OmsDIV
& 3 % ( & 5 % a t x
10 MAG) x
10 (maximum sweep time 2nSlDIV)
Variable
1 us-5s
1120000 or less
Variable
X-axis, Y-axis selectable
X-axis: CHI, CH2+ 2mV-5VIDIV
EXT
+
O.1VlDIV
*
3%
*
3%
EXTI1 0
+
1 VIDIV
*
5%
Y-axis: CHl,CH2+ 2mV-5VlDIV
.t
3%
DC-5OOkHz (-3dB) X-axis Bandwidth
Phase Error
Parameter Function
3" or less at DC-5OkHz
Cursor Measurement Function
Cursor Resolution
Effective Cursor Range
Panel setting
A V, A V%, A VdB, A T, 11 A T , AT%, A 8.
11100 DIV
Vertical:
*
3 DIV; horizontal:
*
4 DIV
Vertical: VIDIV (CHI, CH2),UNCAL, ADD.
INV, P10, ACIDCIGND.
Horizontal: SIDIV (MTB, DTB), UNCAL x IOMAG, Delay time, Hold-off.
Trigger: Source, Coupling, Slope, Level ,
TV-VITV-WTV-L.
Others: X-Y, LOCK, SAVEIRECALL
MEM 0-9.
FREQ, PERIOD, t
(+ or - polarity selected by trigger slop.)
Max. 6-digits, decimal. Display Digits
AUTO
MEASUREMENT
FUNCTION
Frequency Range
Accuracy
Measuring Sensitivity
50Hz-200MHz.
1 kHz-200MHz: k 0 . 0 1 %
5OHz-lkHz : 0 . 0 5 %
>2div(measuring source selected from CH1 and CH2 as synchronous signal source.)
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GOS-6200 OSCILLOSCOPE
USER MANUAl
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GOS-6200 OSCILLOSCOPE
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STORAGE
TEMPERATURE
& HIJMIDITY
MECHANICAL
SPECIFICATION
ACCESSORIES
-10" to 70°C, 70%RH(maximum)
Dimensions
Weight
1310 W x 150 H x
485 D (mm)
Power cord.. ......................... 1
Instruction manual.. ............. 1
Probe ( X l / X 10) ................. 2
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GOS-6200 OSCILLOSCOPE
USER MANUAL
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.
WARNZNG. 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
1 OOV
120V
Range
90-1 10V
108-132V
Fuse
1A250V
Line voltage
230V
Range Fuse
207-250V T 0.4A250V
WARNZNG. To avoid personal injury, disconnect the power cord before removing the fuse holder.
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GOS-6200 OSCILLOSCOPE
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3-3.Environment
The normal ambient temperature range of this instrument is from 0" to
40°C (32O to 104OF). 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.
400V (DC
+
AC peak)
CAUTION. To avoid damaging the instrument, do not apply input voltages of the frequency over 1 kHz to the instrument.
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GOS-6200 OSCILLOSCOPE
USER MANUAL
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 Iilurniriation control (ILLUM) and the Trace Rotation contrbl, 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 SAVEIRECALL controls
Input connectors
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GOS-6200 OSCILLOSCOPE
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Front panel of GOS-6200
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GOS-6200 OSCILLOSCOPE
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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.
( l ) . P O W E R -
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-TRACEIREADOUT & READOUT ONIOFF- 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 TRACEIREADOUT 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" - "TRACE INTEN"
READOUT ONlOFF
Pressing and holding the TRACEIREADOUT pushbutton switches the readout on or off.
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GOS-6200 OSCILLOSCOPE
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(3).TRACE ROTATION
The TRACE ROTATION is for aligning the horizontal trace in parallel with graticule lines. This potentiometer can be adjusted with a small screwdriver.
(4).FOCUS
The control knob effects both the trace and the readout sharply.
(S).ILLUM
The knob controls the graticule illumination brightness.
(6).CAL
The terminal provides a reference signal of 2Vp-p at I kHz for probe adjustment.
Vertical controls
The vertical controls select the displayed signals and control the amplitude characteristics.
Q
VERTICAL
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GOS-6200 OSCILLOSCOPE
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(7).20MHz BWL Pushbutton with indicator LED.
Briefly pressing the pushbutton, the bandwidth is reduced to approx.
20MH2, 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.
(I).CURSOR POS -
AV112 - associated indicator LED.
The function of Cursor Position or CHlICH2 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 CHlICH2 POSITION control knob is then operated as CURSOR l/CURSOR 2 POSITION control. n v 1 1 2
The function is required and available only in DUAL mode in combination with A V (Voltage) measurement. Pressing and holding the pushbutton, then switch between CHI and CH2, the measured result will be displayed by the readout with " A V 1
..."
or " A V 2 ..." providing the defection coefficient is calibrated. The settings of the cursors must be related to the signal of the selected channel.
(9).CH1 POSITION - 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 -
The vertical trace position of channel 2 can be set with the control knob, which is also operated as CURSOR 2 position control in cursor measurement mode. In alternate time base mode, this control knob can be used to separate the DELAY time base trace from the MIAN time base trace. Please note TRACE SEP (1 1).
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GOS-6200 OSCILLOSCOPE
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(I 1)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 CHI POSITION control knob is then operated as vertical position control for the trace(:) of the DELAY time base.
(12)ALTICHOPIADD-INV
The pushbutton has several functions, which are 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 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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GOS-6200 OSCILLOSCOPE
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(1 3 ) C H l VOLTSIDIV.
(14)CH2 VOLTSIDIV- Control knob for channel Ilchannel 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 2mVldiv up to SVIdiv. The knob is automatically switched inactive if the related channel is switched off.
The deflection coefficients and additional information regarding the active channels are displayed in the readout. ie. "CHl=deflection coefficient, input coupling". The "=" symbolizes calibrated measuring conditions and is replaced by the ">" symbol in uncalibrated conditions.
(1 5)CHl-VAR.
(16)CH2-VAR -
C H l l C H 2
Pressing briefly the CHI(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 ("CHI.. . . ").
VAR
Pressing and holding the pushbutton to select the VOLTSIDIV function between attenuator and vernier (variable). The current setting is displayed by the
" symbol in the readout.
After switching on the VAR, turn the VOLTSIDIV control knob counterclockwise to reduce the signal height, and the deflection coefficient becomes uncalibrated.
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GOS-6200 OSCILLOSCOPE
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(17)CHl ACIDC.
(1 8)CH2 ACIDC
Pressing the pushbutton briefly to switch over from AC (- symbol) to
DC (= symbol) input coupling. The setting is displayed in the readout with the deflection coefficient.
(19)CHl GND- P X 10
(20)CH2 GND - P X 10 -Pushbutton has two functions.
GND
Each time when the pushbutton is pressed briefly, the input of the vertical amplifier is grounded. It is displayed in the readout as an earth
(ground) symbol
" h".
P X 10
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:l is displayed in the readout with the probe symbol in front of channel indication (e.g. "PIO", C H I ) When proceed cursor voltage measurement, the probe factor will be automatically included. The symbol must not be activated unless a 10:l attenuator probes are used.
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GOS-6200 OSCILLOSCOPE
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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.
.&a
HORIZONTAL E%
- .
, PU:;H LiiNli
(21)TIMElDIV- Control knob with double function.
Turning 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
0.5sIdiv and 20ns/div can be chosen in 1-2-5 sequence, if the x10
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 50msldiv up to
20nsldiv (without x10 MAG), but the availability depends on the
MAIN time base setting. The internal control of the oscilloscope prevents the DELAY time deflection coefficiept from becoming higher than the MAIN deflection coefficient, as such an operation condition would make no sense.
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GOS-6200 OSCILLOSCOPE
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(22)MAINlALTlDELAY- 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 base can be expanded in X-direction. The expansion ratio depends on the time deflection coefficient ratio of both time bases (ie.
"MTB=O. 1 ms", "DTB=I y s"=100: 1). 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 displayed in the readout.
MAIN
The TIMEIDIV 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 TIMEIDIV knob only controls the DELAY time base switch. The alternate time base mode is a sub-function of the DELAY time base mode and both time base traces can be displayed simultaneously. 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 tinie base.
The window segment can be shifted horizontally by the DELAY TIME control 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 displayed in the readout with an approximate value (e.g. "DLY=O.l25ms") related to the calibrated MAIN time coefficient (uncalibrated i.e. "DLY>0.125ms"). The width of tde
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GOS-6200 OSCILLOSCOPE
USER MANUAL 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 (1 I)).
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 time coefficient is displayed by the readout.
(23)H POSITION
The control knob enables a horizontal position shift of the signals. In combination with x
10 MAG the function makes it possible to shift any part of the signal on the screen.
(24)xlO MAG-SETUPS LOCK- Pushbutton has double function and associated MAG 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 is visible. The interesting part of the signal can be made visible with the aid of the H.
POSITION control.
SETUPS LOCK
Pressing and holding the pushbutton, then switch the panel setups lock function on or off. To avoid unintentional touch of the setting, the feature is extremely useful for long term and repetitive measurements that need to be performed under the same test condition of the oscilloscope setting.
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(25)X-Y-VAR -
X-Y
Set to X-Y mode to select three functions sequentially by pressing the button briefly.
VAR
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=lO y s", the readout then displays
''A>10p s" 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.
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Trigger controls
The trigger controls determine the sweep start timing for both signal and dual trace operation.
TRIGGER
L E V E L t S E L E C T
MODE SOURCE COUPLINC
110 CHI Ac hm
CBl CC
I" N hlR
'YY
DELAY TIME
0-
TV-H /
TV ' A - L 5TD
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(26)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 sequence:
ATO-NML-TV-AT0
A T 0 (Auto)
Select the automatical mode, the sweep free-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.
NML (Normal)
Select the normal mode, the input signal will trigger the sweep when an adequate trigger signal. When the sweep is not triggered, no baseline trace will be displayed.
TV
Separate the video sync signal from the composite waveform and direct it to the triggering circuit. The horizontal or vertical sync signals are selected by TV-VITV-HITV-STD pushbutton. Please refer to the TV-
VITV-H/TV-STD (3 1).
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(27)TRIGGER LEVELITV LINE SELECT-Control knobs
T R I G G E R LEVEL
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 trigger 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
"?" will be displayed on the left of the valued display, that indicates that direct reading is impossible if AC, HFR, LFR, NR coupling or
VAR of vertical deflection is set.
TV LINE S E L E C T
If in the TV LINE trigger mode, the knob can only control the TV line numbers.
(28)COUPLINGlFLD 112 -Pushbutton and indicator LEDs.
Pressing the pushbutton to select the trigger coupling. The actual 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-NR-AC
AC
Attenuates trigger signal frequency components below lOHz and blocks the DC component of the signal.
AC coupling is useful for triggering on AC waveforms that have a large DC offset.
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DC
Couple DC and all frequency components of a triggering signal to the trigger circuitry.
DC coupling is useful for most signals, especially for providing a stable display of low-frequency or low-repetition-rate signals.
HFR (High Frequency Reject)
Attenuates high-frequency triggering signal components above 40kHz.
HFR coupling is useful for 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 is useful 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.
NR (Noise Reject)
Decrease the maximum trigger bandwidth for high frequency signals, as in DC coupling condition, lower frequency signal parts are not affected.
FLD 112
If set to TV LINE trigger mode, select the video field 1 or 2 (even or odd) by pressing the pushbutton. When the pushbutton of FLD 112 is pressed, the field 1 or 2 .will be changed in the sequence as follows:
FLD 1-FLD 2-FLD 1
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(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 is used for the external triggering source signal. When in the dual X-Y operation, the X-axis operates with the external signal.
E/lO(EXT/lO)
The external signal applied through the EXT input is attenuated to
10:l and connector is used for the external triggering source signal.
When in the dual X-Y operation, the X-axis operates with the external signal.
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(30)HO-DELAY-Control knob with a double function and associated
LED.
The control knob has two different functions depending on the time base mode.
H O (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 set 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 (i.e."HO= 25 %").
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 deactivated if ALT (MAIN and DELAY) or DELAY time base mode is selected.
DELAY T I M E
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=O. 125ms").
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.
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(3
1)TV-VITV-HITV-STD-Pushbutton
for video sync signal selection.
In the TV trigger mode, each time when the pushbutton of TV-VITV-
HITV-STD is pressed, the video sync signal is displayed in the sequence as follows:
TV-V-TV-H-TV-L(NTSC)--TV-L(PAL)-TV-L(SECAM)-TV-V
TV-V
Start the main trace at the beginning of a video signal field. SLOPE polarity must match the composite sync polarity (i.e, 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".
TV-STD
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 "SYSTEM, field, line number".
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(32)SLOPE (
1
)/TV SYNC P O L A ( 1 - n )-Pushbutton for the triggering slope or video polarity selection.
If in the AUTO or NML trigger mode, briefly 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 versa.
The current setting is displayed in the readout under item "source,
SLOPE, coupling".
If in the TV trigger mode, briefly pressing the pushbutton to select the video polarity, which will be displayed in the readout with a
"n"
symbol of positive video signal and a
"
-u-
" symbol of negative video signal.
Measurement and Panel setting Control
The measurement section controls the on-screen readout and the cursor measurements. For more information, please refer to page 9 "PANEL
INTRODUCTION" section for the instrument to store and recall the panel setting.
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(33)AUTOSET-
Pressing briefly the AUTOSET pushbutton to set the instrument to the last time base mode of CHI, CH2 and DUAL.
At the same time, the attenuators VOLTSIDIV are automatically set at a signal display height of approx. 3-6 div in mono channel mode or at approx. 3 div height in DUAL mode for each channel.
The time range would change automatically and approx. 1.6 to 4 waveforms are displayed on the screen. For signal of lOOHz or in the absence of a trigger, the time range is set to Smsldiv, and for the signals of approx. 8MHz or more, it is set to 50nsIdiv. The time range change automatically following the different incoming signal.
Proceed AUTOSET function to operate the instrument automatically according to the following condition:
1. Set input coupling to AC.
2. Set internal triggering(CH1 or CH2).
3. Set deflection coefficients between SVIdiv and 2mVldiv calibrated condition.
4. With main time base alternate and set off delay time base mode.
5. Automatic CHI and CH2 horizontal position settings.
6. Trace and readout visible.
7. Set trigger level to zero, trigger mode to AUTO, and trigger coupling to AC.
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(34)
a
MEMO- 9
1) -SAVEIRECALL
The instrument contains 10 non-volatile memories, which can be used by the operator to save instrument setting and to recall them. It relates to all controls which are electronically selected.
Press
a
or
D pushbutton to select the memory location. The readout then indicates the letter "MEN" followed by a cipher between
0 and 9. Each time the [) pushbutton is briefly pressed the memory location cipher increases until the number 9 is reached.
The a pushbutton is similar but decreases the memory location cipher until the number 0 is reached. Pressing and holding SAVE for approx. 3 seconds to write the instrument settings in the memory and indicate the associated readout information of "SAVED".
To recall a front panel setup, select a memory location as described above. Recall the settings by pressing and holding the RECALL pushbutton for approx. 3 seconds, the readout then indicates the associated readout information of "RECALLED.
(35)MEAS'MT FUNC-CURSOR-
Pressing and holding the pushbutton to set Cursor measurement mode on, then press briefly the pushbutton, the seven measurement functions listed below will be selected in the sequence. Pressing and holding the pushbutton again to set the Cursor measurement mode off.
The seven Cursor measurement functions:
A V
A V %
:
:
Voltage difference measurement.
Voltage difference percentage measurement
(5div= 100% reference)
A V d B : Voltage gain measurement.
(Sdiv=OdB reference,AVdB=20 log ( A V divl5div)).
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A T
A T %
1 / A T
~6
:
:
:
:
Time difference measurement.
Time difference percentage measurement.
(5div=lOO% reference).
Frequency measurement.
Phase measurement.
(5div=360° reference).
OFF
During the Cursor measurement going, the function of Auto-measurement is still working at the same time automatically, and the screen is always appeared "auto-measurement" at the right down corner. After the Cursor measurement mode is set off, there are four measurement parameters available for selection in the sequence as follows:
FREQ-PERIOD--+- WIDTH-FDUTY-OFF
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Input connectors
The input section is where the input signals are commonly connected to the oscilloscope.
(36)CHl-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 linelmains plug.
(37)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 linelmains plug.
(38)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.
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(39)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 or Ello" 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 linelmains 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
Input terminals". Do not apply voltage higher than the limit.
4-2.Rear Panel
The rear panel provides input power and additional signal connections.
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(40)Line voltage selector and input fuse holder-Select power source and contain the primary power fuse
The fuse rating is shown in the section of 3-2 Checking the line voltage.
(41)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.
(42)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.
(43)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.
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5.
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 illustrated in figure 5-1 :
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DELAY TIME BASE s DlV
MAIN TIME BASE s i DIV
X10 MAG i
~
1
- DELAY TIME
MEASUREMENT
PANEL S W I N G MEMORY
MEM 0-MEM Q
HOLD OFF TIME
LOCK SYMBOL
I
VED OR RECALLED
.
ADD
,
I
1
TRIG
LEVEL
VALUE
Or
N-LINESTATUS r\,
D(T
El10
TRlG SLOPE f t
CHI
INPUT COUPLING
1
CH2
INPUT COUPLING or TV POLARITY n U
TRlG COUPLING
AC.
DC
GND
%
=
A
A c r\,
DC
GND
A
-
AC
DC
HFR
LFR
NR
I
2 or T b SYNC
. . .
N - H
TV-L
AUTO MEASUREMENT
VALUE
Figure 5-1
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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 x l/x I0 probes supplied to the oscilloscope are shielded against electromagnetic interference and have a high input impedance for low circuit loading.
CAUTION. T o 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 to prevent signal reflections within the cable. Use suitable impedance-matching devices.
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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 periodically 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 x
10 position.
3. Briefly pressing the CHllCH2 button to set the oscilloscope to channel
1 and channel 2.
4. Pressing and holding the PxlO button to set the indicated deflection coefficient of the channel displayed in the readout a s a symbol "PlO"
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:
HORIZONTAL: MODE
TRIGGER:
VOLTSIDIV 1V
COUPLING D%
ALTICHOPIADD CHOP
TIMEIDIV
MODE
SOURCE
COUPLING
SLOPE
MTB
0.5ms
A T 0
CHI or CH2
AC
1
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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". k \ *
Over compsnsated
P Y d c c
Figure 5-2 Typical Compensation Waveform
8.Adjust the probe by using a small insulated screwdriver. Slowly rotate the adjustment control until the probe is properly compensated.
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5-4.Function Check
When you start to check the operation of your oscilloscope, proceed the following instruction:
1. Install the x 10 probes onto CHI and CH2 inputs.
2. Connect the probe tips to the CAL test point of the oscilloscope.
3 . Set the oscilloscope controls to display both channels:
VERTICAL: VOLTSiDIV
COUPLING
1 V
DC
HORIZONTAL:
TRIGGER:
ALTICHOPiADD CHOP
MODE MTB
TIMEiDIV
MODE
SOURCE
0.5ms
A T 0
CHI or CH2
COUPLING AC
SLOPE
1
The figure 5-3 below illustrates a satisfactory display. The waveform should be approximately 2Vp-p at a frequency of lkHz that confirms the vertical and horizontal deflection function of the oscilloscope.
Figure 5-3 Display 1
41 -
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4. Set both CHI and CH2 COUPLING to GND.
5.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. Set to the ADD mode by pressing the ALTICHOPIADD pushbutton briefly.
8. Set both CHI and CH2 COUPLING to DC.
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.
Figure
5-4
Display 2
10. Set to the CHOP mode by pressing the ALTICHOPIADD pushbutton briefly.
1 1. Turn off the CH2 INV by pressing and holding the pushbutton.
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5-5.Basic Operation
Displaying CHI or CH2
To display the signal from a signal channel, pressing briefly the CHI or
CH2 pushbutton to set the oscilloscope to channel I or channel 2.
Displaying CHI and CH2
To display both signals at the same time, proceed the following steps:
1.Set the CHI and CH2 on. The figure 5-5 below shows two synchronous waveforms in the both modes.
2.Adjust the CHI or CH2 POSITION control to position the two waveforms.
3.Set the ALTICHOPIADD button to CHOP mode if the waveforms are flickering.
Figure 5-5 Both typical waveforms
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Displaying the sum or difference of CHI and CH2
To display the algebraic sum or difference of CH1 and CH2, proceed the following steps:
I .Set the ALTICHOPIADD 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 VOLTIDIV control knob to vernier (variable). Then adjust one channel to the other in the event of gain difference.
Figure
5-6
Typical ADD waveform
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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:
1 .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 X-Y button to single X-Y operation (shown as Fig. 5-7 below).
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.
-
45 -
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Setting up Dual X-Y Operation
To use the oscilloscope in the dual X-Y mode, proceed the following steps:
1. 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 l ) input.
3.Connect either of the vertical or Y-axis signal to the CH2(Y2) input.
4. Set the X-Y button to dual X-Y operation.
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 in the horizontal direction.
To display the delayed sweep operation, proceed the following steps:
1. Briefly pressing the MAINIALTIDELAY pushbutton to set to MAIN time base of the horizontal mode. Effect triggering by main sweep and set MAIN TlMElDIV control as desired.
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2.Set the MAINIALTIDELAY button to ALT mode, and set the time range of the DELAY TIMEIDIVE control to be magnified.
The figure 5-9 below shows the main and delayed sweeps appear simultaneously on 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 to be magnified. Then, the waveform between the window sector is magnified to occupy the full area of the screen.
4.If necessary, press the TRACE SEP pushbutton to set the LED on. The delayed sweep trace can be shifted vertically about k 3 divisions with respect to the main sweep trace for the convenience of observation by the CH2 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 MAINIALTIDELAY button. The magnified waveform shown in figure 5-10.
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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
TIMEJDIV control. To use the x10 MAG button, proceed the following steps:
1.Adjust the TIMEIDIV to the fastest sweep that displays the event.
2.Rotate the HORIZONTAL POSITION control to move the event to display on the center of screen.
3 . Press the x
10 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 5-1 l(a) shows several different waveforms which overlapped on the screen, marking the signal observation unsuccessful when the hold off is set to minimum (the HO-LED is dark).
Figure 5-1 l(b) shows the undesirable portion of the signal is held off.
The same waveforms are displayed on the screen without overlapping.
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-
-
-
-
-
-
Hlghllghted parts are displayed
- - -
6
Sweep waveform
Figure 5 - l l ( a )
Adjusting the
I-
HOLD OFF lime
FREO 1 34569 KHz
C H I - 5 0 m V ~
Figure 5 - l l ( 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-VITV-HITV-STD pushbutton to set TV-V triggering. To trigger the oscilloscope at the horizontal (line), press the
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GOS-6200 OSCILLOSCOPE
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TV-VITV-H/TV-STD pushbutton to set TV-H triggering. To trigger the oscilloscope at the liorizontal (signal line), press the
TV-VITV-H/TV-STD pushbutton to set TV-L triggering. The figure
5-12(a) shows vertical signal of TV-V and Figure 5-12(b) shows horizontal signal of TV-H and Fig. 5-12(c) shows horizontal signal
(signal line) of TV-L.
Figure 5-12(a) TV-V
CHliSOmVZI
-
CHI-N-H
Figure 5-12(b) TV-H
NTSC FLDl 18
C H l v N - L CHI= SV?,
Figure 5-12(c) TV-L
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GOS-6200 OSCILLOSCOPE
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The polarity of the synchronization pulse is critical for the slope selection.
The figure 5-13(a) and 5-13(b) shows the examples of TV polarity synchronization signals.
Figure 5-13(a) 1 Sync signal Figure 5-13(b) (_n_) Sync signal
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GOS-6200 OSCILLOSCOPE
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5-6.Measurement Application
The oscilloscope has a cursor measurement system for making accurate, direct-readout voltage, time, frequency and phase measurements. The measurements described in this section are examples of typical applications using this measurement system. After becoming familiar with the controls, indicators, and capabilities of the instrument, you can develop convenient methods to make the special measurement for your own applications.
Proceed a measurement by using the cursor according to the following steps:
1. Pressing and holding the MEAS'MT FUNCTION pushbutton to turn on the cursor and measurement readout.
2. Briefly pressing the pushbutton to select the seven measurement function in the sequence as below:
A V -AV% -AVdB - A T -AT% -1lAT-A 8 -OFF
3. If the associated indicator CURSOR POS-LED is lighted, rotate the
C1-POSITION control to position the cursor 1 and rotate the C2-
POSITION control to position the cursor 2.
4. Read the measurement value on the screen. Typical measurement readouts and applications are shown in Figure 5-14. The measurement values are automatically controlled by the VOLTSIDIV and TIMEIDIV control settings.
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Figure 5-14: Cursor Measurement
(a).Typical A V (Voltage difference) for AC voltage.
When both CHI and CH2 are turned on, the measurement value of CHI( A V1) or
CH2(AV2) can be displayed by pressing and holding the AV112 pushbutton.
(b).Typical AV%(Voltage percentage) cursor measurement for overshoot of square waveform.
A voltage percentage measurement is done by first setting a reference for the full scale
(amplitude) waveform: 5div=100%.
(c).Typical A VdB(voltage gain) cursor measurement for -3dB bandwidth appli-cation.
The percentage reference is: 5div=Odb.
The measurement values calculate the voltage gain from the formula:
AVdB=20 log(AVdivi5div)
(d).Typical A T(Time difference) cursor measurement for rise time.
Proceed rise-time or fall-time measurement requiring some additional signal scaling by using the graticale rise-time measurement aids. Number 0%, 10, 90 and 100 are etched near the left vertical gratical line. Use the following steps as a guideline to in making rise-time measurement:
-
53 -
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GOS-6200 OSCILLOSCOPE
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1 . Set the VOLTSIDIV and VAR controls to provide an exact five-division vertical display.
2. 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 TIMEIDIV setting to stretch out the rising edge of the waveform as much as possible to improve the cursor placement accuracy.
4. Use the CI-POSITION control to align the cursor I to the rising edge at the point where it crosses the 10% reference graticule line.
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 I A T cursor function for frequency measurement.
When the two cursors are superimposed at two edge points of the one period waveform by the C I -POSITION and C2-POSITION controls, the measurement value is displayed in frequency units on the upper side of the screen.
(f) Typical cursor function for duty-cycle measurement of square waveform.
A done by first setting a reference for the full cycle of waveform period: 5div=100%.
I 1 l i l I ! I
I
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(g).Typical A 8 measurement.
A phase measurement is done by first setting a reference for the full 360" waveform period:
5div=360°.
NOTE. When the VOLTSIDIV or the TIMEIDIV controls are in uncalibrated setting, the A V and A T measurement values will be displayed with divisions.
When the vertical mode is set to the ADD mode, and the CHI and CH2
VOLTSIDIV controls are set to different scales, the A V measurement values will be displayed with divisions.
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GOS-6200 OSCILLOSCOPE
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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 oscilloscope will not start. The fuse should not normally open unless a problem has developed in the unit. Try to 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 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 100, 120, or 230VAC 50160Hz line voltage. Conversion from one line voltage to another is done by changing the line voltage selector switch as shown in page 8. 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:
(l).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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GOS-6200 OSCILLOSCOPE
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6-3.Cleaning
To 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.
110 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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CHI A T
CHI
PREAMP
CHZ A T
VERT MODE
SWITCH
DELAY LlNE
DRIVE
DEMY LlNE
4
PANEL
HORIZONTAL
OUTPUT AMP
A
IN~TL
8
TRIG AMP
LlNE TRlG
TRlG OUT
AMP
TRIG
OUTPUT
I
TVSYNC
SEPAWTOR
COUNTER z
AXIS
CONTROL
A
CYCLE
CONTROL
CIRCUIT
HORIZONTAL
SELECTOR
SUPPLY
TO EACH
BLOCK t
POWER
SUPPLY
AC LlNE
50160 Hz
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