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GOS-6200 OSCILLOSCOPE

USER MANUAL

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50

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TV-V/TV-H/TV-STD pushbutton to set TV-H triggering. To trigger the

oscilloscope at the horizontal (signal line), press the

TV-V/TV-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

Figure 5-12(b) TV-H

Figure 5-12(c) TV-L

GOS-6200 OSCILLOSCOPE

USER MANUAL

⎯

51

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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) ( ) Sync signal

Figure 5-13(b) ( ) Sync signal

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Summary of Contents for instek GOS-6200

Page 1: ...t and Checks 5 4 Function Check 5 5 Basic Operation 5 6 Measurement Application 36 36 38 39 41 43 52 6 MAINTENANCE 6 1 Fuse Replacement 6 2 Line Voltage 6 3 Cleaning 56 56 56 57 7 BLOCK DIAGRAM 58 GOS 6200 OSCILLOSCOPE USER MANUAL ii SAFETY TERMS AND SYMBOLS These terms may appear in this manual or on the product WARNING Warning statements identify condition or practices that could result in injur...

Page 2: ...oloured 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 GOS 6200 OSCILLOSCOPE USER MANUAL iv This cable appliance should be protected by a suitably rated and approved HBC mains fuse refer to the rating information on the eq...

Page 3: ...eptibility EN 61000 4 6 1996 Power Frequency Magnetic field EN 61000 4 8 1993 Voltage Dips Interrupts EN 61000 4 11 1994 Low Voltage Equipment Directive 73 23 EEC amended by 93 68 EEC Safety Requirements IEC EN 61010 1 2001 GOS 6200 OSCILLOSCOPE USER MANUAL 1 1 PRODUCT INTRODUCTION 1 1 Description The GOS 6200 is a 200MHz two channel dual sweep portable oscilloscope for general purpose use A micro...

Page 4: ...V 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 GOS 6200 OSCILLOSCOPE USER MANUAL 3 7 Trigger signal output The signal selected by the TRIGGER SOURCE is available This output may be used to connect to ...

Page 5: ... Field 2 NTSC 525H 1H 263H 1H 262H PAL 625H TV Sync SECAM 625H 1H 313H 1H 312H Max External Input Voltage 400V DC AC peak at 1kHz TRIGGER SYSTEM External Input Impedance 1MΩ 5 25pF approx GOS 6200 OSCILLOSCOPE USER MANUAL 5 Horizontal Modes MAIN A ALT DELAY B A main Sweep Time 20ns 0 5sDIV continuously variable UNCAL B delay Sweep Time 20ns 50msDIV Accuracy 3 5 at 10 MAG Sweep Magnification 10 max...

Page 6: ... 2kΩ approx Auto Set Input Channel CH1 CH2 Frequency Response 50Hz 50MHz Panel Setting Save Recall 10 sets SPECIAL FUNCTION Panel Setups Lock Provided Voltage AC 100V 120V 230V 10 selectable Frequency 50Hz or 60Hz LINE POWER REQUIREMENT Power Consumption Approx 90VA 75W max OPERATING ENVIRONMENT Indoor use Altitude up to 2000 m Ambient temperature To satisfy specifications 10 to 35 50 to 95 F Maxi...

Page 7: ... power cord before removing the fuse holder GOS 6200 OSCILLOSCOPE USER MANUAL 9 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 ...

Page 8: ...s are indicated by a warning beep Except the Power pushbutton POWER the Focus control FOCUS the Scale Illumination control ILLUM and the Trace Rotation control all other controls are electronically selected and their functions and settings can therefore be stored The front panel is subdivided into six sections z Display controls z Vertical controls z Horizontal controls z Trigger controls z Measur...

Page 9: ... intensity The TRACE READOUT pushbutton is for selecting the intensity function and indicates the letter TRACE INTEN or READOUT INTEN in the readout Press the pushbutton briefly for the following sequences TRACE INTEN READOUT INTEN TRACE INTEN READOUT ON OFF Pressing and holding the TRACE READOUT pushbutton switches the readout on or off GOS 6200 OSCILLOSCOPE USER MANUAL 13 3 TRACE ROTATION The TR...

Page 10: ...rol in cursor measurement mode In alternate time base mode this control knob can be used to separate the DELAY time base trace from the MIAN time base trace Please note TRACE SEP 11 GOS 6200 OSCILLOSCOPE USER MANUAL 15 11 TRACE SEP The instrument contains a trace separate function which is required in the alternate time base mode to separate the DELAY time base trace s from the MAIN time base in v...

Page 11: ... 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 6200 OSCILLOSCOPE USER MANUAL 17 17 CH1 AC DC 18 CH2 AC DC Pressing the pushbutton briefly to switch over from AC ...

Page 12: ...ed 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 0 1ms DTB 1μs 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 seque...

Page 13: ...n 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 GOS 6200 OSCILLOSCOPE USER MANUAL 21 25 ...

Page 14: ...es in the sequence ATO NML TV ATO ATO 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 the TRIGGER LEVEL control ...

Page 15: ...FR NR AC 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 GOS 6200 OSCILLOSCOPE USER MANUAL 25 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...

Page 16: ...th the external signal GOS 6200 OSCILLOSCOPE USER MANUAL 27 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 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 set to minimum Switch on the LED by t...

Page 17: ... the horizontal sync pulse The current setting is displayed in the readout SYSTEM field line number GOS 6200 OSCILLOSCOPE USER MANUAL 29 32 SLOPE TV SYNC POLA 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 push...

Page 18: ...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 or 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 unti...

Page 19: ... where the input signals are commonly connected to the oscilloscope 36 CH1 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 37 CH2 Input BNC socket This BNC socket is...

Page 20: ...42 TRIGGER SIGNAL OUTPUT 25mV DIV IEC1010 250V CAT 100 SELECTION POWER MAX 70 WATTS 90VA THE INSTRUMENT BEFORE REPLACING THE FUSE ENSURE THE POWER IS REMOVED FROM LINE VOLTAGE 40 230V QUALIFIED PERSONNEL 100V 120V 207 250V T 0 4A 250V 41 50 60Hz RANGE 90 110V 108 132V T 1A FUSE 250V 230 120 AC WARNING 43 Z AXIS INPUT 30Vpk MAX W INTO 50 CAT GOS 6200 OSCILLOSCOPE USER MANUAL 35 40 Line voltage sele...

Page 21: ...ument 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 GOS 6200 OSCILLOSCOPE U...

Page 22: ...gh 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 GOS 6200 OSCILLOSCOPE USER MANUAL 39 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 a...

Page 23: ...MANUAL 41 5 4 Function Check When you start to check the operation of your oscilloscope proceed the following instruction 1 Install the 10 probes onto CH1 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 VOLTS DIV 1V COUPLING DC ALT CHOP ADD CHOP HORIZONTAL MODE MTB TIME DIV 0 5ms TRIGGER MODE ATO SO...

Page 24: ...ay 2 10 Set to the CHOP mode by pressing the ALT CHOP ADD pushbutton briefly 11 Turn off the CH2 INV by pressing and holding the pushbutton GOS 6200 OSCILLOSCOPE USER MANUAL 43 5 5 Basic Operation Displaying CH1 or CH2 To display the signal from a signal channel pressing briefly the CH1 or CH2 pushbutton to set the oscilloscope to channel 1 or channel 2 Displaying CH1 and CH2 To display both signa...

Page 25: ...se 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 45o out of phase To use the oscilloscope in the signal of X Y mode proceed the following steps 1 Connect the ...

Page 26: ... triggering by main sweep and set MAIN TIME DIV control as desired GOS 6200 OSCILLOSCOPE USER MANUAL 47 2 Set the MAIN ALT DELAY button to ALT mode and set the time range of the DELAY TIME DIVE 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 ...

Page 27: ...aveform 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 screen 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 ...

Page 28: ...cal 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 Figure 5 12 b TV H Figure 5 12 c TV L GOS 6200 OSCILLOSCOPE USER MANUAL 51 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...

Page 29: ...lue on the screen Typical measurement readouts and applications are shown in Figure 5 14 The measurement values are automatically controlled by the VOLTS DIV and TIME DIV control settings GOS 6200 OSCILLOSCOPE USER MANUAL 53 Figure 5 14 Cursor Measurement a Typical V Voltage difference for AC voltage When both CH1 and CH2 are turned on the measurement value of CH1 V1 or CH2 V2 can be displayed by ...

Page 30: ...or 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 screen f Typical T Time difference percentage cursor function for duty cycle measurement of square waveform A time difference percentage measurement is done by first se...

Page 31: ...r is tapped to permit operation from 100 120 or 230VAC 50 60Hz 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 1 Make sure the power cord is unplugged 2 Adjust the line vo...

Page 32: ...GOS 6200 OSCILLOSCOPE USER MANUAL 58 7 Block Diagram ...

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