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GOS-6112 OSCILLOSCOPE

USER MANUAL

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Summary of Contents for GOS-6112

Page 1: ...peration 5 6 Measurement Application 32 32 34 35 37 39 47 6 MAINTENANCE 6 1 Fuse Replacement 6 2 Line Voltage 6 3 Cleaning 51 51 51 52 7 BLOCK DIAGRAM 53 GOS 6112 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 injury or loss of life CAUTION Caution statement...

Page 2: ...loured 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 6112 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 equipment and or user instructions for detai...

Page 3: ...61000 4 4 1995 Surge Immunity EN 61000 4 5 1995 Conducted Susceptibility 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 EN 61010 1 1990 A1 1992 A2 1995 IEC 61010 1 1990 A1 1992 A2 1995 GOS 6112 OSCILLOSCOPE USER MANUAL 1 1 PRODUCT INTRODUCTION 1 1 Descri...

Page 4: ...plying 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 6112 OSCILLOSCOPE USER MANUAL 3 6 Trigger signal output The signal selected by the TRIGGER SOURCE is available This output may be used to connect to a frequency counter or other instrument 7 Panel setups lock To avoid unintentional to...

Page 5: ...HOP Repetition Frequency Approx 250kHz Polarity INV CH2 only Bandwidth Limited 20MHz Common mode Rejection Ration 50 1 or better at 50kHz VERTICAL DEFLECTION SYSTEM Dynamic Range 8 div at 60MHz 5 div at 100MHz Trigger Modes AUTO NORM TV Trigger Source CH1 CH2 LINE EXT Trigger Coupling AC DC HFR LFR Trigger Slope polarity or TV sync polarity Mode Frequency INT EXT 10Hz 20MHz 0 35DIV 50mVpp AUTO 20M...

Page 6: ... and 100 markers 8 x 10 DIV 1 DIV 1 cm Phosphor P31 CRT Accelerating Potential 12kV approx External intensity modulation Coupling DC Voltage 5V or more Maximum Input Voltage 30V DC AC peak at 1kHz or less Z AXIS INPUT Bandwidth DC 5MHz GOS 6112 OSCILLOSCOPE USER MANUAL 6 Voltage 25mV DIV approx in 50Ω termination Frequency Response DC 10MHz TRIGGER SIGNAL OUTPUT Output Impedance 50Ω approx Wavefor...

Page 7: ...OS 6112 OSCILLOSCOPE USER MANUAL 8 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 t...

Page 8: ...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 z Display controls z Vertical controls z Horizontal controls z Trigger controls z Measurement control z Input connectors GOS 6112 OSCILLOSCOP...

Page 9: ...ockwise to decrease the intensity The TRACE READOUT pushbutton is for selecting the intensity function and indicates the letter TRACE INTEN or READOUT INTEN in the readout Press the pushbutton briefly for the following sequences TRACE INTEN READOUT INTEO TRACE INTEN GOS 6112 OSCILLOSCOPE USER MANUAL 12 3 TRACE ROTATION The TRACE ROTATION is for aligning the horizontal trace in parallel with gratic...

Page 10: ...e 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 6112 OSCILLOSCOPE USER MANUAL 14 11 TRACE SEP The instrument contains a trace separate function which is required in the alternate time base mode to separate the DELAY time base trace s from the MAIN time base in vertical direction Consequently this functi...

Page 11: ... 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 16 17 CH1 AC DC 18 CH2 AC DC Pressing the pushbutton briefly to switch over from AC symbol to DC symbol input coupling The set...

Page 12: ...AY 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 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 D...

Page 13: ...ll 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 GOS 6112 OSCILLOSCOPE USER MANUAL 20 SETUPS LOCK Pressing and holding the pushbutton then switch the panel setups lock func...

Page 14: ...quate 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 V TV H pushbutton Please refer to the TV V TV H 31 27 LEVEL Control knob Turning the control knob causes a different trigger input setting voltage and...

Page 15: ...ates 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 GOS 6112 OSCILLOSCOPE USER MANUAL 24 29 SOURCE Pushbutton and associated LEDs Pressing the pushb...

Page 16: ...would be no window sector as the main trace is not visible GOS 6112 OSCILLOSCOPE USER MANUAL 26 31 TV V TV 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 ...

Page 17: ...eference θ Phase measurement 5div 350o reference GOS 6112 OSCILLOSCOPE USER MANUAL 28 Input connectors The input section is where the input signals are commonly connected to the oscilloscope 35 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 instr...

Page 18: ... 110V SELECTION 25mV DIV 40 250V T 1A FUSE 250V T 0 4A 108 132V 207 250V 90 110V RANGE 50 60Hz 41 42 INTO 50 OUTPUT CAT W INPUT 120 230 TO AVOID ELECTRIC SHOCK THE POWER CORD PROTECTIVE GROUNDING QUALIFIED PERSONNEL NO OPERATOR SERVICEABLE COMPONENTS INSIDE DO NOT REMOVE FOR CONTINUED FIRE PROTECTION REPLACE ONLY WITH SPECIFIED CONDUCTOR MUST BE CONNECTED TO GROUND WARNING COVERS REFER SERVICING T...

Page 19: ... 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...

Page 20: ...lied to the oscilloscope are shielded against electromagnetic interference and have a high input impedance for low circuit loading 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 p...

Page 21: ...on 3 Briefly pressing the CH1 CH2 button to set the oscilloscope to channel 1 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...

Page 22: ...horizontal deflection function of the oscilloscope Figure 5 3 Display 1 GOS 6112 OSCILLOSCOPE USER MANUAL 38 4 Set both CH1 and CH2 COUPLING to GND 5 Use the CH1 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 ALT CHOP ADD pushbutton briefly 8 Set both CH1 and CH2 COUPLING to DC 9...

Page 23: ...waveforms are flickering Figure 5 5 Both typical waveforms GOS 6112 OSCILLOSCOPE USER MANUAL 40 Displaying the sum or difference of CH1 and CH2 To display the algebraic sum or difference of CH1 and CH2 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 n...

Page 24: ...Refer to 2 SPECIFICATION section for details Figure 5 7 Typical single X Y display GOS 6112 OSCILLOSCOPE USER MANUAL 42 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 CH1 Y1 input 3 Connect either of the vertical or Y axis signal...

Page 25: ...ar back from the starting point to view by using the TIME DIV control To use the 10 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 to display on the center of screen 3 Press the 10 MAG button to switch the MAG LED on When above procedures have been done the displayed waveform will ...

Page 26: ...cal frame rate press the TV V TV H pushbutton to set TV V coupling To trigger the oscilloscope at the horizontal line press the TV V TV H pushbutton to set TV H coupling The figure 5 12 a shows vertical signal of TV V and Figure 5 12 b shows horizontal signal of TV H GOS 6112 OSCILLOSCOPE USER MANUAL 46 Figure 5 12 a TV V Figure 5 12 b TV H The polarity of the synchronization pulse is critical for...

Page 27: ...eadouts and applications are shown in Figure 5 14 The measurement values are automatically controlled by the VOLTS DIV and TIME DIV control settings GOS 6112 OSCILLOSCOPE USER MANUAL 48 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 pressing and holding the V1 2 pushbutto...

Page 28: ...ors 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 setting a reference for the full cycle of wa...

Page 29: ...20 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 7 The rear panel identifies the line voltage to which the unit was factory set To convert to a different line voltage perform the following procedure 1 Make sure the power cord is unplugged 2 Adjust the line voltage selector switch to the desired line ...

Page 30: ...GOS 6112 OSCILLOSCOPE USER MANUAL 53 7 Block Diagram www GlobalTestSupply com Find Quality Products Online at sales GlobalTestSupply com ...

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