GOS-6xxG Family Dual Trace Oscilloscope
Contents
1. X axis X Y Operation CH1 Figure 4 6 Figure 4 7 Note When high frequency signals are displayed in the X Y operation pay attention to the frequency bandwidths and phase difference between X and Y axis EXT HOR external sweep Operation The external signal applied through the EXT HOR terminal 23 drives the X axis The Y axis is with any channels as selected by the VERT MODE switch When the DUAL mode is selected by the switch both CH 1 and CH 2 signals are displayed in the CHOP mode 4 7 Triggering Proper triggering is essential for efficient operation of an oscilloscope The user must be thoroughly familiar with the triggering functions and procedures 1 Functions of SOURCE switch The displayed signal itself or a trigger signal which has a time relationship with the displayed signal is required to be applied to the trigger circuit to display a stationary signal on the CRT screen The SOURCE switch is used for selecting such a triggering source 1 The internal trigger method which is used most commonly CH2 The signal applied to the vertical input terminal is branched off from the preamplifier and is fed to the trigger circuit through the VERT MODE switch Since the triggering signal is the measured signal itself a stable waveform can be readily displayed on the CRT screen When in the DUAL or ADD operation the signal selected by the SOURCE switch is used as the triggering source sign2. 7 1 Jhongsing Rd Tucheng City Taipei County 236 Taiwan GOOD WILL INSTRUMENT SUZHOU CO LTD No 69 Lushan Road Suzhou New District Jiangsu China declare that the below mentioned products GOS 622G GOS 626G GOS 623G GOS 635G GOS 652G GOS 653G GOS 658G are 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 89 336 EEC 92 3 1 EEC 93 68 EEC and Low Voltage Equipment Directive 73 23 EEC 93 68 EEC For the evaluation regarding the Electromagnetic Compatibility and Low Voltage Equipment Directive the following standards were applied EN 61326 1 Electrical equipment for measurement control and laboratory use EMC requirements 1997 1 1998 Conducted Emission Electrostatic Discharge IEC 1000 4 2 1995 Radars EN 3s02 s 0999 Voltage Fluctuations EN 61000 3 3 Surge Immunity IEC 1000 4 5 Conducted Susceptibility 61000 4 6 ee Low Voltage Equipment Directive 73 23 EEC 1 GENERAL 1 1 Description The 6xxG family oscilloscopes are dual channel oscilloscopes with maximum sensitivity of 1 mV DIV and maximum sweep time of 10 nSec DIV Each of these oscilloscopes employs 6 inch rectangular type cathode ray tube with red internal 623G 653G and 658G each has a sweep magnification feature with B sweep whereas 626G and 658G provide the read out function which
3. CH 2 of the two signals The pushed in state of CH 2 INV 36 button is for the difference CH 1 CH 2 Triggering EXT TRIG EXT input terminal 23 Input terminal is used in common for external triggering signal and external horizontal signal To use this terminal set SOURCE switch 26 to the EXT position SOURCE ee Rete ted 26 Select the internal triggering source signal and the EXT HOR input signal CH 1 X Y When the VERT MODE switch 39 is set in the DUAL or ADD state select CH 1 for the internal triggering source signal When in the X Y mode select CH 1 for the X axis signal CH2 When the VERT MODE switch 39 is set in the DUAL or ADD state select CH 2 for the internal triggering source signal TRIG ALT 24 When the VERT MODE switch 39 is set in the DUAL or ADD state and the SOURCE switch 26 is selected at CH 1 or CH 2 with the engagement of the TRIG ALT switch 24 it will alternately select CH 1 amp CH 2 for the internal triggering source signal LINE To select the AC power line frequency signal as the triggering signal EXT The external signal applied through EXT TRIG EXT HOR input terminal 23 is used for the external triggering source signal When in the X Y EXT HOR mode the X axis operates with the external sweep signal COUPLING 25 Select COUPLING mode 25 between triggering source signal and trigger circuit select connection of TV sync trigger circuit AC AC coupl
4. Connect the probe to the INPUT terminal of or CH2 and set VOLTS DIV switch at 50mV Connect the probe tip to the calibration voltage output terminal and adjust the compensation trimmer on probe for optimum square wave minimum overshoot rounding off and tilt Refer to 4 18 Figure 4 18 a Correct compensation b Over compensation c Insufficient compensation LV ar ic S MAINTENANCE The following instructions are for use by qualified personnel only To avoid electrical shock do not perform any servicing other than in the operating instructions unless you are qualified to do so 5 1 Fuse Replacement If the fuse blows the power lamp indicators will not light and the oscilloscope will not operate 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 The replace only with a fuse of the correct rating and type see page 7 The fuse is located on the rear panel see fig 4 2 WARNING For continued fire protection Replace fuse only with 250V fuse of the specified type and rating and disconnect power cord before replacing fuse 5 2 Line Voltage Conversion The primary winding of the power transformer is tapped to per
5. ITL GWINSTEK 056536 lt mos p gt 5 PORTON M i s ii Y i Figure 4 1 c 26 2 9 Model 653G 50MHz Model 623G 20MHz Figure 4 1 d Model 626G Figure 4 1 e Model 658G GWINSTEK _ cossesc Oscillos GWINSTEK _ 6056586 2 4 OPERATION METHOD 4 1 Introduction of Front Panel POWER 9 Main power switch of the instrument When this switch is turned on the LED 8 is also turned on INTEN 2 Controls the brightness of the spot or trace BINTEN 3 623G 653G amp 658G only Semi fixed potentiometer for adjusting trace intensity when in B sweep mode READOUT INTEN 7 626G amp 658G only Semi fixed potentiometer for adjusting intensity of the readout and cursors FOCUS eR 4 For focusing the trace to the sharpest image EUM 6 Except 622G amp 635G Graticule illumination adjustment TRACE ROTATION 5 Semi fixed potentiometer for aligning the horizontal trace in parallel with graticule lines FILTER Q Ree 42 Filter
6. V delta cursor is above the W REF cursor when the V delta cursor is below the W REF cursor 6 si Display the measured value and units of the seven cursor measurement functions AV AV AT DUTY PHASE 0 0V 40 0V 400V for PROBE x10 NOTE When the V DIV VAR is set to uncalibrated position or when the VERT MODE is at ADD but the CH1 amp CH2 sensitivities on V DIV are not the same the measuring unit will be value is displayed in division 0 00 to 8 00 div instead 0 0 160 5 div 100 reference 41 9dB 4 08dB 5 div OdB reference 20 log A V div 5 div NV div measured difference division value 0 0nS 5 00S NOTE When the SWP UNCAL button is pushed in the measured value is displayed in divisions 0 00 to 10 00 div 200 0mHz 2 500GHz When the SWP UNCAL button is pushed in or two cursors are overlap the unknown value displays 7 gt 0 0 200 0 5 div 100 reference 0 0 720 5 div 360 reference NOTE Except AV 96 dB the other functions 1 AT DUTY PHASE are selected and then the X Y button is engaged the unknown value displays 777 4 12 Calibration of Probe As explained previously the probe makes up a wide range attenuator Unless phase compensation is properly done the displayed waveform is distorted causing measurement errors Therefore the probe must be properly compensated before use
7. Y A T D TV V H B T D for 658G only Measurement category I is for measurements performed on circuits not directly connected to MAINS Measurement category II is for measurements performed on circuits directly connected to the low voltage installation Measurement category III is for measurements performed in the building installation Measurement category IV is for measurements performed at the source of the low voltage installation Line Power Requirements Voltage AC 100V 120V 220V 230V 10 selectable Frequency 50Hz 60Hz Power consumption Approx 70VA 60W max Mechanical Specifications Dimensions 310 W x 150 H x 455 D mm Weight Approx 8 2Kg 18 Ibs Operating Environment Accessories Indoor use Power cord 1 Altitude up to 2000 m Instruction manual 1 Ambient temperature 2 To satisfy specifications 5 1035 41 to 95 Maximum operating ranges 0 to 40 C 32 to 104 Relative humidity 8596 RH max non condensing Installation Category Pollution degree 2 Storage Temperature amp Humidity 10 to 70 C 70 RH maximum 3 PRECAUTIONS BEFORE OPERATING THE OSCILLOSCOPE 3 1 Unpacking the Oscilloscope The oscilloscope is shipped from the factory after being fully inspected and tested Upon receiving the instrument immediately unpack and inspect it for any damages that might have been sustained during tran
8. continuous delay method delay jitter is produced To suppress the jitter the triggering delay method may be used With the triggering delay delay jitter is reduced by triggering the B sweep again after a sweep delay time as effected by the continuous delay method has elapsed For this operation the A trigger circuit continues to operate even after the B TRIG D button is engaged and the B sweep is triggered by the triggering pulse Therefore even when the delay time is continuously varied by turning the TIME DELAY POSITION knob the starting point of the sweep moves discretely not continuously In the A INTEN mode this operation is characterized by the discrete shifts of the brightness accentuated section of sweep across the CRT screen while in the B mode this section remains stationary z qm Figure 4 13 HORIZ DISPLAY A INTEN Figure 4 14 HORIZ DISPLAY B INTEN 4 11 Readout Function 626G and 658G lt Sweep delay time Sweep A INTEN This start point moves discretely B trigger level Figure 4 15 The selected sensitivity input sweep time etc are displayed in the positions as shown in Figure 4 16 NOTE The CRT will not show any trace or spot when the TRIGGER MODE is in NORM state To observe the signals depress the AUTO button CHI Display When the VERT MODE switch is at DUAL
9. counter check the switch and control setting 2 Adjust the trace to an appropriate brightness and image with the INTEN control and FOCUS control respectively 3 Align the trace with the horizontal center line of the graticule by adjusting the CH 1 POSITION control and TRACE ROTATION control adjustable by screwdriver 4 Connect the probe to the CH 1 INPUT terminal and apply the 2Vp p CALIBRATOR signal to the probe tip 5 Setthe AC DC GND switch to the AC state waveform as shown in the figure 4 3 will be displayed on the CRT screen 6 Adjust the FOCUS control so that the trace image appears sharply 7 For signal viewing set the VOLTS DIV switch and TIME DIV switch in appropriate positions so that signal waveform is displayed clearly 8 Adjust the AV POSITION and lt p POSITION controls in appropriate positions so that the displayed waveform is aligned with the graticule and voltage Vp p and period T can be read conveniently The above are the basic operating procedures of the oscilloscope The above procedures are for single channel operation with CH 1 Single channel operation with CH 2 can also be achieved in a similar manner Further operation methods are explained in the subsequent paragraph 4 4 Dual channel Operation Change the VERT MODE switch to the DUAL states so that trace CH 2 is also displayed The explanation in the proceeding section is of CH 1 At this state of procedure the CH 1 trace is the square wave of the ca
10. for ease of waveform viewing Vertical Axis CH 1 X input 12 Vertical input terminal of CH 1 When in X Y operation X axis input terminal CH 2 Y input 16 Vertical input terminal of CH 2 When in X Y operation Y axis input terminal AC DC GND 11 15 Switch for selecting connection mode between input signal vertical amplifier AC ACcoupling DC DC coupling GND Vertical amplifier input is grounded and input terminals are disconnected VOLTS DIV 10 14 Select the vertical axis sensitivity from 1mV DIV to 5V DIV in 12 ranges VARIABLE 13 17 Fine adjustment of sensitivity with factor of gt 1 2 5 of the indicated value When CAL position sensitivity 15 calibrated to indicated value POSITION 40 37 Vertical positioning control of trace or spot VERT MODE 39 Select operation modes of CH 1 and CH 2 amplifiers CH1 The oscilloscope operates as a single channel instrument with CH 1 alone CH2 The oscilloscope operates as a single channel instruments with CH 2 alone DUAL The oscilloscope operates as a dual channel instrument both CH 1 and CH 2 CHOP ALT are automatic changed by TIME DIV switch 18 When CHOP 41 button is pushed in the two traces are displayed in the CHOP mode at all ranges ADD The oscilloscope displays the algebraic sum CH 1 CH 2 or difference CH 1
11. or ADD state the set values of CHI are displayed at 1 However these values are not shown when the VERT MODE is at CH2 P10 sign is shown when probe x10 is setted b gt sign is shown when the V DIV VAR is at UNCAL position e Display the selected sensitivity from to 5V Probe x10 from 10mV to 50V d x sign is displayed when the X Y button is set and the VERT MODE is at CH2 At DUAL X Y mode 1 is displayed 26 CH2 Displayed Figure 4 16 Set values of CH2 signal are displayed at 2 when the VERT MODE is at CH2 MD DUAL or ADD They are not displayed in the CH1 mode a P10 sign is shown when the probe x10 is setted Gg o b gt sign is shown when the V DIV is at UNCAL position uus Display the selected sensitivity from 1mV to 5V Probe x10 from 10mV to 50V TEE d y sign is shown at X Y mode y2 sign is shown at DUAL X Y mode ADD SUB amp CH2 INV Display HEE EEE HEH The ADD SUB and INV functions are displayed at 3 a is shown when the VERT MODE is at ADD position then the inputs CH1 amp CH2 are algebraically summed N b A L sign is displayed when the VERT MODE is at CH2 or DUAL and the CH2 INV button is engaged When the CH2 INV button is ES o ol d ao aXb pushed in the
12. signal crosses the triggering lever in the negative going direction 4 Function of Level LOCK control DIV The function of this control is to adjust the triggering level and display a stationary image At the instant the triggering signal has crossed the triggering level set by the control the sweep is triggered and a waveform is displayed on the screen The trigger level changes in the positive direction upward as this control knob is turned clockwise and it changes in the Trigger level negative direction downward as the knob is turned counter 4 clockwise The characteristic changes are shown Figure 4 10 Graticule scale NE equivalent DIV tts Level knob rotation angle Left lt Center gt Right LEVEL LOCK When LEVEL LOCK push switch is engaged the triggering Figure 4 10 level is automatically maintained within the amplitude of the triggering signal and stable triggering is made without requiring 622G 623G 626G level adjustment although jitter may not be suppressed when in the ALT mode 50 Hz 5MHz 1 0DIV 0 15V or less This automatic level lock function is effective when the signal amplitude on the 5MHz 20MHz 2 0DIV 0 25V or less screen or the input voltage of the external triggering signal is within the 635G 50 Hz 5MHz 1 0DIV 0 15V or less following range 5MHz 35MHz 2 0DIV 0 25V or less 652G 653 658G 50 Hz 10MHz 1 0DIV 0 15V or less 10MHz 40MHz 2 0DIV 0 2
13. t Med iat beenden t c tret eb o tid ette a aaa tetas dee ES 4 6 X Y Operation and EXT HOR Operation Ar Triggeri REOR 4 8 Single sweep Operation 4 9 Sweep Magnification 4 10Waveform Magnification with Delayed Sweep 623G 653G and 658G only 4 11 Readout Function 626G and 658G only 4 12 Calibration of Probe S MAINTENANCE ovt 5 1 Fuse Replac ni nt aaa apas ege hie aiii as 5 2 Line Voltage Conversion 5 3 Cleaning S SUME vele M toys QN 6 BLOCK DIAGRAM e phat vast e rd deca eti eee etie t v n e een Eee RR 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 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 A A DANGER ATTENTION Protective Earth ground Frame or chassis High Voltage refer to Manual Conductor Terminal Terminal Terminal This lead appliance must only be wired by competent persons NOTE WARNING THIS APPLIANCE MUST BE IMPORTANT The wires in this lead are coloured in accordance with the following code Green Yellow Blue Bro
14. 5V or less 5 Functions of HOLD OFF control When the measured signal is a complex waveform with two or more repetition frequencies periods triggering with the above mentioned 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 HOLD OFF time sweep pause time of the sweep waveform The control covers at least one full sweep time for sweeps faster than 0 2s DIV Figure 4 11 a shows several different waveforms which overlapped on the screen making the signal observation unsuccessful when the HOLD OFF knob is in the MIN state Figure 4 11 b shows the undesirable portion of the signal is held off The same waveforms are displayed on the screen without overlapping 4 8 Single sweep Operation Non repetitive signals and one shot transient signals can hardly be observed on the screen with the regular repetitive sweep operation Such signals can be measured by displaying them in the single sweep mode on the screen and photographing them Measurement of non repetitive signal 1 Setthe TRIGGER MODE to the NORM state 2 Apply the measured signal to the vertical input terminal and adjust the triggering level Complex waveform digital signal cycle y MOOT Highlighted parts are displayed Figure 4 11 a 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 I Adjusting
15. 8G only Select A and B sweep modes as follows A Main sweep A sweep mode for general waveform observation A INT This sweep mode is used when selecting the section to be magnified of A sweep in preparation for delayed sweep The B sweep section delayed sweep corresponding to the A sweep is displayed with a high intensity beam et B Display the delayed sweep B sweep alone B TRIG D Select between continuous delay and triggered delay Disengaged For continuous delay The B sweep starts immediately after the sweep delay time set by A TIME DIV and B TIME DIV switch and DELAY TIME knob has elapsed Engaged For triggered delay B sweep starts when the triggering pulse is applied after the sweep delay time set by A TIME DIV and B TIME DIV switch and DELAY TIME knob has elapsed The triggering signal is used in common for both A sweep and B sweep sasiy 2 Press the Y button t to enable X Y operation Others 1 This terminal delivers the calibration voltage of 2 Vp p 1kHz positive square wave The output resistance is 2k ohm see page 5 technical specification for tolerance GND ana qua 20 Ground terminal of mainframe Readout Function Only available in 626G amp 658G CURSOR measurement 32 CURSOR ON OFF Press the button to turn on off the cursor measurement CURSOR FUNCTION Press the button to select the measurement functions AV Voltage differ
16. GIC TRIG CH2 SIGNAL TRIG PICKUP AMP X AXIS SIGNAL c TRIG TRIG A SWEEP HORIZONTAL HORIZONTAL oeo INPUT AMP GENERATOR GENERATOR SWITCHING OUTPUT AMP EXT TRIG amp 70 FREE RUN EXT HOR SIGNAL lt U POWER gt LINE INPUT AC LN SWEEP BLOCK SUPPLY 50 60 Hz GENERATOR V LINE 653G 658G 2Vp p 1IKHz O CALIBRATOR SQUARE WAVE Led BLOCK DIAGRAM
17. GOS 6xxG Family Dual Trace Oscilloscope Members Of The Family 50MHz Cursor Readout With Delayed Sweep GOS 658G 20MHz Cursor Readout usun tor ccna oo ees GOS 626G 20MHz Basic with Delayed Sweep GOS 623G 50MHz Basic With Delayed Sweep GOS 653G 50MHz Base zas ox arisini is vrnn Set tax p ene GOS 652G 35MHz toe k eee ee eee GOS 635G 20MHz BASIC GOS 622G 82OS 658G0MG CONTENTS PAGE lEGENERAL z aun a palu b e setate DO t oad ued n cere eb ad natin medie 1 1 1 Description 1 2 2 TECHNICAL SPECIFICATIONS 3 PRECAUTIONS BEFORE OPERATING THE OSCILLOSCOPBE nsn traten ttn teen 6 3 1 Unpacking the Oscilloscope 3 2 Checking the Line Voltage 3 3 EBVIEOnmeTit iw vei ieee ci Op e ete E tva ra CE 3 4 Equipment Installation and Operation seen neni terrenis 3 S CRT Intensity oe ett qid pna 3 6 Withstanding Voltages of Input Terminals 4 OPERATION 4 1 Introduction of tee re de en a de det dde ents S 4 2 JntroductionsofRear Panels ud atate te T HEAT t ted rede tpe neta etae ten ed 4 3 Basic Operation 4 4 Dual ch nnel u epe to PR RAI fe pe edel ede ek teda EL a o id Deeds 3 4 52 ADD Operation dne etate rte tered
18. al LINE The AC power line frequency signal is used as the triggering signal This method is effective when the measured signal has a relationship with the AC line frequency especially for measurements of low level AC noise of audio equipment thyristor circuits etc EXT The sweep is triggered with an external signal applied to the external trigger input terminal An external signal which has a periodic relationship with respect to the measured signal is used Since the measured signal is not used as the triggering signal the waveforms can be displayed more independent than the measured signal The above triggering source signal selection functions are shown collectively in the following table by 1 zs mr ty XT TR eS 2 Functions of COUPLING switch This switch is used for selecting the coupling of the triggering signal to the trigger circuit in accordance with the characteristics of the measured signal AC This coupling is for AC triggering which is used most commonly As the triggering signal is applied to the trigger circuit through an AC coupling circuit stable triggering can be attained without being affected by the DC component of the input signal The low range cut off frequency is 10Hz 3dB When the ALT trigger mode is used and the sweep speed is slow jitter may be produced In such a case use the DC mode The triggering signal is fed to the trigger circuit through an AC coupling circuit
19. and a low pass filter approximately 50kHz 3dB The higher components of the trigger signal are rejected and only the lower components are applied to the trigger circuit TV This coupling is for TV triggering for observation of TV video signals The triggering signal is AC coupled and fed through the triggering circuit level circuit to the TV sync separator circuit The separator circuit picks off the sync signal which is used to trigger the sweep Thus the video signal can be displayed stably Being linked to the TIME DIV switch the sweep speed is switched for TV V and TV H as follows TV V 0 5 s 0 1 ms Figure 4 8 SLOPE 50 us 0 1 us The SLOPE switch should be set to conform to the video signal as shown in Figure 4 8 DC The triggering signal is DC coupled to the trigger circuit This mode is used when triggering is desired with the DC component of the triggering signal or when a signal with very low frequency or a signal with large duty cycle ratio is needed to be displayed Range Fi 4 9 3 Function of SLOPE switch T Slope r pci 1 1 FN This switch selects the slope polarity of the triggering signal Range Level as shown in Figure 4 9 7 decus z When set in state triggering occurs as the triggering signal crosses the triggering lever in the positive going direction _ When set in the state triggering occurs as the triggering
20. anked out Used primarily for observation of signal lt 50 Hz SINGLE Use for single sweep Except 622G amp 635G Push to RESET Operation one short triggering operation and in common as the reset switch When these three buttons are disengaged the circuit is in the single trigger mode The circuits is reset as this button is pressed When the circuit is reset the READY lamp turns on The lamp goes out when the single sweep operation is over Time Base A TIME DIV 18 Select the sweep time of the A sweep A and B sweep in common for 658G only B TIME DIV A TIME DIV B TIME DIV 43 623G amp 653G only Select the sweep time of delayed sweep B sweep 21 Vernier control of sweep time When SWP UNCAL 19 button is pushed in the sweep time can be made slower by factor 22 5 of the indicated value The indicated values are calibrated when this button is not pushed in 34 Horizontal positioning control of the spot 10 33 When the button is pushed in magnification of 10 occurs DELAY 44 623G amp 653G only Vernier control of the delay time selected by the A TIME DIV 18 and B TIME DIV 43 switch to finely select the portion of the A sweep waveform to be magnified HORIZ DISPLAY MODE 38 623G 653G amp 65
21. en functions including AV AV AVdB AT 1 AT DUTY and PHASE for 626G 658G only 2 TECHNICAL SPECIFICATIONS 20MHz OSCILLOSCOPE 35MHz 50MHz OSCILLOSCOPE SPECIFICATIONS 622G 626G 623G 635G 652G 653G 658G 1mV 5V DIV 12 steps in 1 2 5 sequence Sensitivity accuracy 5mV 5V DIV X396 ImV 2mV DIV lt 5 10 C to 35 C 50 F to 95 F lt lt 5 DIV at the center of display gt gt To 1 2 5 or less of panel indicated value Frequency bandwidth 3dB 5mV 5V DIV DC 20MHz 622G 623G 626G 5mV 5V DIV DC 35MHz 635G 1mV 2mV DIV DC 10MHz AC coupling Low limit frequency 10Hz With reference to 100kHz 8DIV Frequency response with 3dB Rise time 5mV 5V DIV 17 5ns 622G 623G 626G 5mV 5V DIV 10ns 635G 1mV 2mV DIV 35ns Input impedance 1M ohm 12 Approx 25pF Square wave characteristics Overshoot lt 5 At 10mV DIV range lt lt 5 DIV at the center of display gt gt Other distortions and other ranges 5 added to the above value 10 to 35 50 F to 95 F VERTICAL Vertical modes CHI CHI single channel AXIS CH2 CH2 single channel DUAL CHOP ALT are auto set by TIME DIV switch CHOP 0 5s 5ms DIV ALT 2ms 0 1 u s DIV When CHOP switch is pushed in the two traces are displayed in the CHOP mode at all range ADD CH1 CH2 algebraic addition Maximum input voltage 400V DC AC peak AC frequency 1kHz or lower When set probe switch at 1 1 the maximum effective readout is 40Vp
22. enables an easy read out for settings and cursor measured values These oscilloscopes are sturdy easy to operate and exhibit high operational reliability 1 2 Features 1 High intensity CRT with high acceleration voltage The CRT is a high beam transmission high intensity type with a high acceleration voltage of 2kV for models 622G 623G 635G and 626G and 12kV for models 652G 653G and 658G It displays clear readable traces even at high sweep speeds 2 High stability with less drift The oscilloscope employs a temperature compensation circuit which is newly developed to reduce the drift of base lines and DC balance disturbance caused by the temperature change 3 A trigger level lock function which makes the triggering adjustment unnecessary A new trigger level lock circuit is incorporated This circuit eliminates the procedures of the troublesome triggering adjustment not only for displaying signals but also for that of video signals and large duty cycle signals 4 TV sync triggering The oscilloscopes have a sync separator circuit incorporated within the TIME DIV switch for automatic triggering of TV V and TV H signals 5 Linear focus Once the beam focus is adjusted to the optimum position it is automatically maintained regardless to the intensity change 6 Cursor readout measurement The unique easy to use cursor and numerical readouts make waveform observations and measurement faster and accurate The on screen cursors provide sev
23. ence measurement AV Voltage difference measurement in percentage 5 div 210046 ref AVdB Voltage gain measurement 5 div OdB ref AVdB 20 logAdiv Sdiv AT Time difference measurement 1 AT Frequency measurement DUTY Duty cycle or time difference percent AT measurement 5 div 100 ref PHASE Phase measurement 5 div 360 ref Di ye TRACK V W REF Press the button to select the cursor s to be moved The selected cursor is indicated by eithera V Y symbol When both symbols are displayed the two cursors can be shifted simultaneously POSITION 35 Rotate the cursor POSITION control to position the selected cursor s When HORZ DISPLA Y mode 15 set A INT or B state and CURSOR ON OFF is set off the POSITION control is used in common as the DELAY TIME For 658G only READOUT ON OFF To turn on off the readout status on the CRT press the CURSOR ON OFF and CURSOR FUNCTION buttons at the same time PROBE X 10 To indicate the voltage readout is scaled for X 1 or X 10 probe press the TRACK 7 W REF button and rotate the cursor POSITION 35 at the same time 4 2 Introduction of Rear Panel Z AXIS INPUT 45 Input terminal for external intensity modulation signal CH 1 SIGNAL OUTPUT 46 Delivers the CH 1 signal with a voltage of approximately 100mV per 1 DIV of graticule When terminated with 50 ohms the signal is attenuated to about one half Suitable for frequency coun
24. equired portion may run off the CRT screen In such a case push in the x10MAG button When this has been done the displayed waveform will be expanded 10 times to the right and left with the center of screen as the center of expansion The sweep time during the magnification operation is as follows Figure 4 12 Value indicated by TIME DIV switch x1 10 MMM Thus the unmagnified maximum sweep speed 0 1 us DIV E can be increased with the magnification as follows 0 1 ns DIVx1 10 10 us DIV When the sweep is magnified and the sweep speed is above 0 1 us DIV the trace may become darker In such a case the displayed waveform should be expanded in the B sweep mode as explained in the subsequent paragraphs mean of POSITION conta 2 10 x magnification 4 10 Waveform Magnification with Delayed Sweep 623G 653G 658G only With sweep magnification of the preceding paragraph although the magnification method is simple the magnification ratio is limited to 10 With the delayed sweep method of this paragraph the sweep can be expanded for a wider range from several times to several thousand times according to the ratio between A sweep time and B sweep time As the measured signal frequency increases the A sweep range for the non expanded signal becomes higher whereas the available expansion ratio becomes smaller Furthermore as the magnification ratio becomes larger the trace intensity becomes lower and the delay jitt
25. er increases To cope with these situations a continuously variable delay circuit and a triggering delay circuit are incorporated into the oscilloscope 1 Continuous variable delay Set the HORIZ DISPLAY MODE switch to A and display the signal waveform with the A sweep in the regular operation mode Next set the B TIME DIV switch to a position several steps faster than that of the A TIME DIV switch After ensuring the B TRIG D button of the HORIZ DISPLAY MODE switch is disengaged engage the HORIZ DISPLAY MODE switch to the A INTEN position portion of the displayed waveform will be accentuated as shown in Figure 4 14 indicating the state ready for delayed sweep The portion of the accentuated brightness indicates the section corresponding to the B sweep time DELAYED SWEEP This portion is expanded on the B sweep The period from the start of the A sweep to that of the B sweep the period to the start of trade accentuation is called SWEEP DELAY TIME This period is continuously variable by means of the DELAY TIME POSITION knob Next change the HORIZ DISPLAY MODE switch to the B position The B sweep time will be expanded for the full span of the CRT screen as shown in Figure 4 15 The B sweep time is set by the B TIME DIV switch the magnification ratio becomes A TIME DIV indication Magnification YT QO D B TIME DIV indication 2 Triggering delay When the display waveform is magnified by 100 or higher in the above mentioned
26. gnals can be displayed on the screen by setting the VERT MODE switch to the ADD state The displayed signal is the difference between CH 1 and CH 2 signals if the CH 2 INV push switch is engaged For accurate addition or subtraction it is a prerequisite that the sensitivities of the two channels are adjusted accurately at the same value by means of the VARIABLE knobs Vertical positioning can be made with the AV POSITION knob of either channel In view of the linearity of the vertical amplifiers it is most advantage to set both knobs in their mid positions 4 6 X Y Operation and EXT HOR Operation When the TIME DIV switch is set in the X Y EXT HOR state the internal sweep circuit is disconnected and the trace in the horizontal direction is driven by the signal selected by the SOURCE switch When the SOURCE switch is set to the CH 1 X Y position the oscilloscope operates as an X Y scope with the CH 1 signal for the X axis when it is set to the EXT position the oscilloscope operates in the EXT HOR external sweep mode X Y Operation The X Y operation is with CH 1 as X axis and CH 2 as Y axis The bandwidth of the X axis becomes DC to 1MHz 3dB or DC to 2MHz for 652G 653G 658G and the horizontal POSITION control is directly used as the X axis POSITION control For the Y axis the CH 2 X Y should be selected by the VERT MODE switch Y axis CH2 Dual Channel
27. ing DC DC coupling REJ Removes signal components above 50kHz 3dB TV The trigger circuit is connected to the TV sync separator circuit and the triggered sweeps synchronize with TV V or TV H signal at a rate selected by the TIME DIV switch 18 TV V 0 5 s DIV 0 1ms DIV 5Ops DIV 0 1us DIV SLOPE s Su sasa 22 Select the triggering slope Triggering occurs when the triggering signal crosses the triggering level in positive going direction gt Triggering occurs when the triggering signal crosses the triggering level in negative going direction To display a synchronized stationary waveform and set a start point for the waveform Toward The triggering level moves upward on the display waveform Toward The triggering level moves downward on the display waveform LOCK 29 Triggering level is automatically maintained at optimum value irrespective of the signal amplitude from very small to large amplitudes requiring no manual adjustment of triggering level HOLD OFF 31 Used when the signal waveform is complex and stable triggering cannot be attained with the LEVEL knob alone TRIGGER MODE 28 Select the desired trigger mode AUTO When no triggering signal is applied or when triggering signal frequency is less than 50 Hz sweep runs in the free run mode NORM When no triggering signal is applied sweep is in a ready state and the trace is bl
28. lay HORIZONTAL B sweep delay sweep time 0 1 us 0 5ms DIV 12 steps AXIS Sweep time accuracy 3 10 to 35 50 to95 F 6230 653G amp 658G Delay time lus 5ms lt 1 10000 weep magnification 10 times maximum sweep time 10ns DIV xlOMAG sweep time accuracy 0 1 s 50ms DIV 5 10ns 50ns DIV 8 10 to 35 C 50 F to 95 F Tsay osition shift caused by Within 2 div at CRT screen center Sensitivity Same as vertical input signal Y axis CH2 input signal Sensitivity accuracy 4 x10MAG 6 10 to 35 C 50 to 95 F X Y MODE Frequency bandwidth DC 1MHz 3dB DC 2MHz 3dB a DC SU PION 0 1 V DIV Trace swept by an external horizontal signal applied to the EXT TRIG IN terminal Vertical axis modes are CH1 CH2 DUAL and ADD modes in the CHOP mode DC 2 2MHZ 30B MODE zm d difference between vertical lt 3 at DC 50kHz lt 3 at DC 100kHz anak MODHLAMEZOSCILOSCOPE aM OSCILLOSCOPE SPECIFICATIONS Acceleration voltage Approx 2 kV Approx 12 kV X 10 DIV CI DIV Tommi Graticule Internal continuous adjustable illumination 623G 626G 652G 653G 658G only V AV AVaB AT WAT DUTY PHASE Cursor display format V DELTA W REF Dobis 125 DIV Effective cursor range from center Vertical 3 DIV 626G 658G Panel setting display V DIV V MODE INV ALT CHOP UNCAL ADD SUB x10MAG PROBE x1 x10 X
29. librator signal and the CH 2 trace is a straight line since no signal is applied to this channel yet Now apply the calibrator signal to the vertical input terminal of CH 2 with the probe as is the case for CH 1 Set the AC DC GND switch to the AC state Adjust vertical POSITION knobs 40 and 37 so that both channel signals are displayed as shown in Figure4 4 When in the dual channel operation DUAL or ADD mode the CH 1 or CH 2 signal must be selected for the triggering source signal by means of the SOURCE switch If both CH 1 and CH 2 signals are in a synchronized relationship both waveforms can be displayed stationary if not only the signal selected by the SOURCE switch can be stationary If the TRIG ALT push switch is engaged both waveforms can be stationary Do not use and ALT triggering source switch at the same time Selection between CHOP mode and ALT mode are automatically made by the TIME DIV switch shown in Figure 4 5 The 5mSec DIV and lower ranges are used in the CHOP mode and the 2ms DIV and higher ranges are used in the ALT mode When the CHOP push switch is engaged the two traces are displayed in the CHOP operation at all ranges The CHOP operation has priority over the ALT operation EE Signal of CH1 Signal of CH2 Hi 4 5 ADD Operation An algebraic sum of the CH 1 and CH 2 si
30. mit operation from 100 120 220 or 230V AC 50 60Hz line voltage Conversion from one line voltage to another is done by changing the line voltage selector switch as shown in Fig 4 2 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 Change the line voltage selector switch to the desired line voltage position 3 Achange in line voltage may also require a corresponding change of fuse value Install the correct fuse value as listed on rear panel 5 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 Do not use chemicals containing benzine benzene toluene xylene acetone or similar solvents Do not use abrasive cleaners on any portion of the oscilloscope 6 BLOCK DIAGRAM 652G CH1 SIGNAL 653G OUTPUT 658G 12KV CHI 00 Qu 626G 658G INPUT MICROPROCESSOR CH1 ATT CHARACTER ua CONTROL CONTROL GENERATOR CIRCUIT PANEL CH1 TRIG X AXIS VERT MODE PICKUP AMP VERTICAL SWITCH OUTPUT AMP a CH2 Y INPUT cH2 SWITCHING CH2 ATT PREAMP LO
31. p 14Vrms at sine wave or set probe switch at 1 10 the maximum effective readout is 400Vpp 140Vrms at sine wave 50 1 or better at 50kHz sinusoidal wave When sensitivities of CH1 and CH2 are set equally Isolation between channels gt 1000 1 at 50kHz gt 30 1 at 20MHz 622G 623G 626G gt 1000 1 at 50kHz gt 30 1 at 35MHz 635G At 5mV DIV range 5mV 5V DIV DC 50MHBz ImV 2mV DIV DC 15MHz 5mV 5V DIV 7ns 1mV 2mV DIV 23ns gt 1000 1 at 50kHz gt 30 1 at SOMHz At 5mV DIV range 20MHz OSCILLOSCOPE 35MMz 50MHz OSCILLOSCOPE SPECIFICATIONS 622G 626G 623G 635G 652G 653G 658G Approx 100mV DIV without termination 50mV DIV with 50 ohm termination Bandwidth 622G 623G 626G 635G 20MHz 652G 653G 658G 40MHz CH2 INV BAL Balanced point variation lt 1 DIV Reference at center graticule VERTICAL gt 8DIV at 20MHz Signal dey rang ca be monitored CHI CH2 LINE EXT CH1 and CH2 can be selected only when the vertical mode i is DUAL or ADD In ALT mode if the TRIG ALT switch is pushed in it can be use for alternate triggering of two different source AC HF REJ TV DC TV V TV H can be auto set by TIME DIV range TV V 0 5s 0 1ms DIV TV H 50 s 0 1 s DIV DC SMHz 0 5 DIV EXT 0 1V 5 20MHz 1 5 DIV EXT 0 2V 622G 623G 626G 5 35MHz 1 5 EXT 0 2V 635G VES pes TV video signal 2 0 DIV EXT 0 2V AC coupling Attenuate
32. pment may be impaired 3 5 CRT Intensity To prevent permanent damage to the CRT phosphor do not make the CRT trace excessively bright or leave the spot stationary 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 as shown in the following table Do not apply voltages higher than these limits Maximum input voltage CH2 inputs 400V DC AC peak EXT TRIG input 100V DC AC peak 600V DC AC peak Z AXIS input 50V DC AC peak Voltage w r t Earth N CAUTION To avoid instrument damage do not exceed maximum input voltages Maximum input voltages must have frequencies less than 1 kHz If an AC voltage which is superimposed DC voltage is applied the maximum peak of CH1 and CH2input voltages must xceed or 400V So for AC voltages with a mean value of zero volt the maximum peak to peak value is 800 Vpp GWINSTEK _ 605 6226 Figure 4 1 a Model 622G Model 635G aan us 5 SS o 6 9 2 Figure 4 1 b 652 7 52 43 394 5 1 E V M L ET
33. signal components of lower than 10Hz HF REJ Attenuate signal components of higher than 50kHz TRIGGERING AUTO Sweeps run in the free mode when no triggering input signal is applied Applicable for repetitive signals of frequency 50Hz or over NORM When no triggering signal is applied the trace is in the READY state and not displayed SINGLE One shot sweep with triggering signal Can be reset to the READY state by means of the RESET switch The READY lamp LED turns on when in the READY state or in the sweep operation 623G 626G 652G 653G and 658G only LEVEL LOCK and ALT Satisfies the value of the above trigger sensitivity plus 0 5 DIV EXT 0 05V for signal of duty cycle 20 80 Repetition frequency 50Hz 20MHz 622G 623G 626G NM Repetition f 50Hz 40MH triggering Repetition frequency 50Hz 35MHBz 635G bip ci cc d z EXT triggering signal input EXT HOR input terminal is used in common Input impedance 1M ohm 12 approx 35pF Max input voltage 100V DC AC peak AC Frequency not higher than IKHz B triggering signal The A triggering signal of main sweep is used as the B triggering signal 623G 653G amp 658G CHI signal output Coupling Triggering modes ORES 1 SPECIFICATIONS A sweep main sweep time Hold off time Continuous variable twice sweep length time at 0 1uSec ImSec DIV ranges B sweep delay system Continuous delay and triggered de
34. sportation If any sign of damage is found immediately notify the bearer and or the dealer 3 2 Checking the Line Voltage These oscilloscopes will operate on any one of the line voltage shown in the table below by inserting the line voltage selector plug in the corresponding position on the rear panel Before connecting the power plug to an AC line outlet make sure the voltage selector is set to the correct position corresponding to the line voltage Note the oscilloscope may be damaged if it is 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 below 100V 90 110V T 0 63A 220V 198 242V T 0 315 250V 250V 120V 108 132V 230V 207 250V N WARNING To avoid personal injury disconnect the power cord before removing the fuse holder 3 3 Environment The normal ambient temperature range of this instrument is 0 to 40 32 to 104 F Operation of the instrument above this temperature range may cause damage to the circuits Do not use the instrument in a place where strong magnetic or electric field exists Such fields may disturb the measurement 3 4 Equipment Installation and Operation Ensure there is proper ventilation for the vents in the oscilloscope case If this equipment is used in a manner not specified by the manufacturer the protection provided by the equi
35. subtraction of CH2 from CHI is in function 0 0 5 TIME Display The sweep time is displayed at 4 The A sweep time is shown at the under row the B sweep time is shown at the upper row B sweep 658G only a and B are shown at and B sweep time b is shown normally sign is displayed when the x10 MAG button is pushed in gt sign is displayed when the SWP UNCAL button is engaged 6 eese shows the selected sweep time from 10ns to 0 55 An X Y is displayed when the X Y button is pushed in CHOP ALT Display The CHOP or ALT are displayed at 5 when the VERT MODE is set to DUAL When X Y button is engaged an gt S displayed TV V TV H Display The or TV H are displayed at 6 when the TRIG COUPLING is set to TV position Cursor Measured Value Display The relative measured values of the seven functions are displayed at 7 a Shows each of seven functions AV AV AVdB DUTY PHASE which may be selected by the CURSOR FUNCTION button The function provide different V V2 V12 according to following table VERT MODE CH2 DUAL CHI ANI TRIG CH2 ANI SOURCE LINE NOTE When X Y mode is not set at correct position the error message X Y mode error is shown b In the function a polarity is shown when the
36. the HOLDOFF 1 pos time l 1 Figure 4 N 110 Figure 4 11 3 Set the TRIGGER to the SINGLE state the three push button switches are pushed out 4 Press the SINGLE button The sweep will run only for one cycle and the measured signal will be displayed only once on the screen 23 Measurement of single shot signal Except 622G amp 635G 1 Set the TRIGGER MODE to the NORM state 2 Apple the calibration output signal to the vertical input terminal and adjust the triggering level at a value corresponding to the predicted amplitude of the measured signal 3 Set the TRIGGER MODE to the SINGLE state Apply the measured signal instead of the calibration signal to the vertical input 4 Depress the SINGLE button The sweep circuit is now in the ready state and the READY indicator lamp will be turned on 5 As the one shot signal occurs in the input circuit the sweep runs only for one cycle and the one shot signal is displayed on the CRT screen However this cannot be done when the dual channel ALT mode is in operation For the dual channel one sweep operation use the CHOP mode instead 4 9 Sweep Magnification When a certain part of the displayed waveform is needed to be expanded timewise a faster sweep speed may be used However if the required portion is apart from the starting point of the sweep the r
37. ting etc AC POWER Input Circuit Figure 4 2 AC Power input connector 47 AC Power input socket Connect the AC power cord supplied to this connector FUSE amp line voltage selector 48 Fuse rating is shown in Page 7 Line voltage selector to select power sources Studs for laying the oscilloscope on its back to operate it in the upward posture Also used to take up the power cord EEN i 4 3 Basic Operation Before connecting the power cord to an AC line outlet make sure that the AC line voltage input switch on the rear panel of the instrument is correctly set for the AC line voltage After ensuring the voltage setting set the switches and controls of the instrument as shown below Disengage position OFF 2 Clockwise 3 o clock Pasa position 4 Mid position Pushed in 6 Full anti clockwise Position MIN anti clockwise Except 622G amp 635G AUTO 39 1 A 623G 653G amp 658Gonly 41 Released 36 Released 0 5mSec DIV 40 37 Mid position Released 10 14 0 5V DIV Mid position 13 17 CAL clockwise position Released 11 15 GND Released 26 Setto CH 1 25 AC After setting the switches and controls as mentioned connect the power cord to the AC line outlet and then continue as follows 1 Engagethe POWER switch and make sure that the power LED is turned on In about 20 seconds a trace will appear on the CRT screen If no trace appears in about 60 seconds
38. wn EARTHED Earth Neutral Live Phase FOR UNITED KINGDOM ONLY 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 amp Yellow must be connected to the Earth terminal marked with the letter E or by the earth symbol D or coloured Green or Green amp 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 This cable appliance should be protected by a suitably rated and approved HBC mains fuse refer to the rating information on the equipment and or user instructions for details As a guide cable of 0 75mm should be protected by 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 amp fuse carrier and disposed of immediately as a plug with bared wires is hazardous if a engagedin live socket Any re wiring must be carried out in accordance with the information detailed on this label EC Declaration of Conformity We GOOD WILL INSTRUMENT CO LTD No
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