USER MANUAL.
Contents
1. SQUARE WAVE AC LINE I 50 60 2 TRIGGER SWEEP O Q o TRIGGER INPUT HORIZONTAL HORIZONTAL du AMP GENERATOR GENERATOR SWITCHING P OUTPUT AMP EXT FREE RUN SIGNAL LINE AUTO CIRCUIT TO EACH oO BLOCK lt POWER SUPPLY LINE TRIG 2Vp phikHz CALIBRATOR MATRIX lt MATRIX Technology INC Vigool Industrial Zone ShangXue KeJiYuan BanTian LongGang ShenZhen China Tel 86 755 61217000 100 lines Fax 86 755 61217111 http www szmatrix com E mail sales szmatrix com LM2. Any part can coverde by of POSITION control Figure 4 7 Y axis CH2 4 9 X Y Operation Set the TIME DIV switch to X Y position Then the instrument works as an X Y oscilloscope Each input is applied to the instrument as follows X axis signal horizontal axis signal CH1 INPUT Y axis signal vertical axis signal CH2 INPUT 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 X axis 4 He Figure 4 8 X Y operation permits the oscilloscope to perform many measurements not possible with conventional sweep operation The CRT display becomes an electronic graph of two instantaneous voltages The display may be a direct comparison of the two voltages such as a vectorscope display of video color bar patterns However the X Y mode can be used to graph almost any dynamic characteristic if a transducer is uesd to change the characteristic frequency temperature velocity etc into a voltage One common application is frequency response measurements where the Y axis corresponds to signal amplitude and the X axis corresponds to frequency 1 Set the TIME DIV control to the X Y position fully counterclockwise In this mode channel 1 becomes the X axis input and channel 2 becomes the Y axis input 2 The x and Y positions are now adjusted usi
3. OSCILLOSCOPE MOS 6XX FAMILY USER MANUAL 150 9000 2000 CERTIFIED MANUFACTURER MOS 600 FAMILY Dual Trace Oscilloscope Members Of The Family MOS 620 20MHz Basic MOS 620FG 20MHz Basic With Frequency Counter MOS 640 40MHz Basic MOS 640FG 40MHz Basic With Frequency Counter CONTENTS PAGE 1 GENERAL 1 1 Description 1 2 Features 2 TECHNICAL 3 PRECAUTIONS BEFORE OPERATING THE OSCILLOSCOPE 3 1 Unpacking the 3 2 Checking the Line Voltage 3 3 Environment 3 4 Equipment Installation and Operation 3 5 CRT Intensity sss eee 3 6 Withstanding Voltages of Input Terminals 4 OPERATION METHOD 4 1 Introduction of Front Panel 4 2 Introduction of Rear Panel 4 3 Basic Operation Single channe 4 4 Dual Channel Operation 5 4 5 ADD Operation 15 4 6 Triggering 4 7 TIME DIV control 4 8 Sweep Magnification 4 9 X Y Operation 4 10 Calibration of Probe 4 11 DC BAL Adjustments 5 5 1 Fuse replacement 5 2 Line Voltage Conversion 5 3 Cleaning 6 BLOCK DIAGRAM SAFETY TERMS AND SYMBOLS These terms may appear in this manual or on the product N WARNING Warning statements indentify condition or practices that could result in injury or loss of life CAUTION Caution statements indent
4. 1 This terminal delivers the calibration voltage of 2 Vp p 1KHz positive square wave GND 15 Ground terminal of oscilloscope mainframe FREQUENCY METER 39 Display a synchronized signal frequency 4 2 introduction of Rear Panel Z AXIS INPUT 34 Input terminal for external intensity modulation signal CH 1 SIGNAL OUTPUT 35 Delivers the CH 1 signal with a voltage of approximately 20mV per 1 DIV into a 50 ohm termination Suitable for frequency counting etc AC POWER Input Circuit AC Power input connector 36 AC Power input socket Connect the AC power cord supplied to this connector FUSE Fuse rating is shown in Page 5 38 Studs for laying the oscilloscope on its back to operate it in the upward posture Also used to take up the power cord LINE VOLTAGE SELECTOR 41 to select power sources 4 3 Basic Operation Single channel Operation Before connecting the power cord to an AC line outlet make sure that the voltage input 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 Item No Setting Item No Setting POWER 6 Disengage position OFF SLOPE 26 INTEN 2 Mid position TRIG ALT 27 Released FOCUS 3 Mid position TRIGGER MODE 25 AUTO VERT MODE 14 CH1 TIME DIV 29 0 5mSec DIV ALT CHOP 12 Released ALT SWP VER 30 CAL
5. 25 Select the desired trigger mode AUTO When no triggering signal is applied or when triggering signal frequency is less than 25Hz sweep runs in the free run mode NORM When no triggering signal is applied sweep is in a ready state and the trace is blanked out Used primarily for observation of signal 25Hz TV V This setting is used when observing the entire vertial picture of television signal TV H This setting is used when observing the entire horizontal picture of television signal Both TV V i izing si i tive Time Base Both and TV H synchronize only when the synchronizing signal is negative TIME DIV 4 29 Sweep time ranges are available in 20 steps from 0 2 HS div to 0 5 S div X Y This position is used when using the instrument as an X Y oscilloscope 30 Vernier control of sweep time This control works as CAL and the sweep time is calibrated to the value indicated by TIME DIV of sweep can be varied continuously when shaft is out of CAL position Then the control is rotated in the direction of arrow to the full the CAL state is produced and the sweep time is calibrated to the value indicated by TIME DIV Counterclockwise rotation to the full delays the sweep by 2 5 time or more 4 gt POSITION 32 Horizontal positioning control of the trace or spot x10 31 When the button is pushed in a magnification of 10 occurs Others CAL
6. TV H Setting the MODE switch to the TV H position permits selection of horizontal sync pulses for sweep triggering when viewing composite video waveforms Horizontal sync pulses are selected as trigger to permit viewing of horizontal fields of video A sweep time of about 10 is div is appropriate for displaying lines of video The SWP VAR control can be set to display the exact number of waveforms desired This oscilloscope synchronizes with only polarity that is the sync pulses are negative and the video is positive as shown in Figure 4 5 2 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 Figure 4 5 trigger circuit to display a stationary signal on the CRT screen The SOURCE switch is used for selecting such a triggering source CH 1 The internal trigger method which is used most commonly CH 2 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 signal Line The AC power line frequency signal is used as the triggering signal This method is effective when the measured signal has a relationsh
7. 20 DC BAL adjustments for the details A v POSITION 11 19 Vertical positioning control of trace or spot VERT 14 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 instrument with CH 2 alone DUAL The oscilloscope operates as a dual channel instrument both CH 1 and CH 2 ADD The oscilloscope displays the algebraic sum CH 1 CH 2 or difference CH 1 CH 2 of the two signals The pushed in state of CH2 INV 16 button is for the difference CH 1 CH 2 12 When this switch is released in the dual trace mode the channel 1 and channel 2 inputs are alternately displayed normally used at faster sweep speeds When this switch is engaged in the dual trace mode the channel 1 and channel 2 inputs are chopped and displayed simultaneously normally used at slower sweep speeds 2 1 16 Inverts the 2 input signal when the CH2 INV switch mode is pushed The channel 2 input signal in ADD mode and the channel 2 trigger signal pickoff are also inverted Triggering EXT TRIG IN input terminal 24 Input terminal is used for external triggering signal To use this terminal set SOURCE Switch 23 to the EXT position SOURCE 32 Select the internal triggering source signal and the EXT
8. TRIG IN input signal CH 1 When the VERT MODE switch 14 is set in the DUAL or ADD state select CH 1 for the internal triggering source signal CH2 When the VERT MODE switch 14 is set in the DUAL or ADD state select CH 2 for the internal triggering source signal TRIG ALT 27 When the VERT MODE switch 14 is set in the DUAL or ADD state and the SOURCE switch 23 is selected at CH 1or CH 2 with the engagement of the TRIG ALT switch 27 it will alternately select CH 1 amp CH 2 for the internal triggering source signal LINE To select the AC powerline frequency signal as the triggering signal EXT The external signal applied through EXT TRIG IN input terminal 24 is used for the external triggering Source signal SLOPE 26 select the triggering slope 4 Triggering occurs when the triggering signal crosses the triggering level n positive going direction 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 triggeting level moves upward on the display waveform Toward The triggeting level moves downward on the display waveform click 28 by fully clockwise positien then triggring level is automatically maintained at optimum value irrespective of the signal amplitude requiring no manual adjustment of triggring level TRIGGER MODE
9. 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 4 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 Cleaning To clean the oscilloscope use a soft cloth dampened in a solution of mild detergent and water Do not spray cleaner directly on to 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 21 6 BLOCK DIAGRAM SIGNAL OUTPUT 9 VERTICAL OUTPUT AMP 640 84056 12KV CHI X 4 INPUT 4 emm PREAMP CHi TRIG X AXIS gt rd VERT VERTICAL SIGNAL MODE SWITCH CH2 Y 1 INPUT CH2 2 gt SWITCHING PREAMP irra TRIG PICKUP AMP TRIG SWITCH X AXIS SIGNAL Z AXIS AMP Z AXIS INPUT CRT CIRCUIT H V SUPPLY
10. setting is used when the sweep time is long in 2 channel observal 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 displayed stationary 4 5 ADD Operation An algebraic sum of the CH 1 and CH 2 signals 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 AY 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 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 MODE switch AUTO When the AUTO switch is engaged automatic sweep operation is selected in automatic sweep operation the sweep generator free runs to generate a sweep
11. EPLACE ONLY YOH AND RATED FUSE No OPERATOR ERVICEASLE CON COVERS REFER SERVING TO 4 0PERATION METHOD 4 1 Introduction of Front Panel CRT 6 Main power switch of the instrument When this switch is turned on the LED 5 is also turned on INTEN Controls the brightness of the spot or trace FOCUS 3 For focusing the trace to the sharpest image TRACE ROTATION 4 Filter for ease of waveform viewing Vertical Axis CH 1 X input 8 Vertical input terminal of CH 1 When in X Y operation X axis input terminal CH 2 Y input 20 Vertical input terminal of CH 2 When in X Y operation Y axis input terminal AC GND DC 10 18 Switch for selecting connection mode between input signal and vertical amplifier AC AC coupling GND Vertical amplifier input is grounded and input terminals are disconnected DC DC coupling VOLTS DW 7 22 Select the vertical axis sensitivity from 5mV DIV to SV DIV in 10 ranges VARIABLE 9 21 Fine adjustment of sensitivity with a factor of 1 2 5 of the indicated value When in the CAL position sensitivity is calibrated to indicated value When this knob is pulled out x5 MAG state the amplifier sensitivity is multiplied by 5 CH1 amp CH2 DC BAL 13 17 These are used for the attenuator balance adjustment See page
12. Vpeak do not exceed maximum input voltages Probe inputs 600Vpeak Maximum input voltages must have Z AXIS input 30Vpeak frequencies less than 1 KHz an AC voltage which is superimposed on a DC voltage is applied the maximum peak value of CH1 and CH2 input voltages must not exceed or 300V So for AC voltages with a mean value of zero volt the maximum peak to peak value is 600Vpp Figure 4 1 MODEL MOS 600 FG f MATIREEX lt OSCILLOSPOPE MOS 620FG E 3 N aims ai N ee 8 8 88 8 8 SWP VAR TRIGGER TRIG ALY MODE SOURCE f N SLOPE a AS NRI VERTICAL M VOUTSIDIV A POSITION Or oc 4 BAL BAL Y Y NODE ow VAR PULLASMAG KL CHR ds ml e oo O 00 ce OO OG Figure 4 2 MODEL MOS 600 Z AXIS INPUT CATH 64 ourpur 250V POWER MAX 35 WATTS 40VA WARNING 0 ELECTRIC SHOCK POWER CORD PROTECYYO GhOUNONO CONDUCTOR MUST BE CONNECTED GROUND FOR CONTE FIRE PROTECTION R
13. d TV V This setting is used when observing the entire vertical picture of television signal TV H This setting is used when observing the entire horizontal picture of television signal Both TV V and TV H synchronize only when the synchronizing signal is negative EXT triggering signal input Input impedance Approx 1M ohm approx 25pF Max input voltage 300V DC AC peak AC Frequency not higher than 1KHz Sweep time 0 2 0 5Sec DIV 20steps 1 2 5 sequence Sweep time accuracy 3 Vernier sweep time control x 1 2 5 of panel indicated value HORIZIONAL Sweep magnification 10 times AXIS X10MAG sweep time accuracy 5 20nSec 50nSec are uncalibrated Linearity 3 10 5 20ns and 50ns are uncalibrated Position shift caused by x10MAG Within 2 DIV at CRT screen center Sensitivity Same as vertical axis X axis CH1 input signal Y axis CH2 input signal X Y MODE Frequency bandwidth DC to at least 500KHz X Y phase difference x 3 at DC 50KHz 20MHz OSCILLOSCOPE 40MHz OSCILLOSCOPE SPECIFICATIONS MOS 620 MOS 640 Sensitivity 5Vp p Positive going signal decreases intensity Frequency bandwidth DC 2MHz ZAXIS Input resistance Approx 47K ohm Maximum input voltage 30V DC AC peak AC frequency lt iKHz Waveform Positive going square wave Frequency Approx 1 KHz Duty ratio Within 48 52 VOLTAGE Output voltage 2Vp p 2 Output impedance Approx 1 K ohm Type 6 inch rectangular type internal grat
14. easurements both traces must be triggered the same sync signal When the CHOP and the TRIG ALT switches are both engaged during dual trace operation synchronization of the display is not possible because the chopping signal becomes the trigger Use the ALT mode by itself or select CH1 or CH2 as trigger source 4 7 TIME DIV Control Set the TIME DIV control to display the desired number of cycles of the waveform if there are too many cycles displayed for good resolution switch to a faster sweep speed If only a line is displayed try a slower sweep speed When the sweep speed is faster than the waveform being observed only part of it will be displayed which may appear as a straight line for a square wave or pulse waveform 4 8 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 required portion may run off the CRT screen In such a case push in the x10 MAG 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 Value indicated by TIME DIV switch x1 10 Thus the unmagnified maximum sweep speed 1Sec DIV can be increased with the magnification as follows 1 pSec DIV 1 10 100nSec DIV
15. ed 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 Figure 4 3 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 calibrator 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 GND DC switch to the AC state Adjust vertical POSITION knobs 11 and 19 so that both channel signals are displayed as shown in Figure4 4 Signal of CH1 Signal of CH2 When ALT CHOP switch is released ALT MODE the input signals applied respectively to CH1 and CH2 appears the screen alternatively at each sweep This setting is used when the sweep time is short in 2 channel observation When ALT CHOP switch is engaged CHOP MODE the input signals applied to CH1 and CH2 are switched at about 250KHz independent of the sweep and at the same time appear on the screen This
16. hold level in a positive going direction When the TRIG SLOPE control is set to the position down a sweep trigger is developed from the trigger source waveform as it crosses the threshold level in a negative going direction This switch selects the slope polarity triggering signal as shown in Figure4 6 LEVEL LOCK Control level 28 to fally clockwise the triggring level is locked at a fixed value and stable triggering is made without requring level adjustment This automatic level lock function is effective when the singal amplitude on the screen or the input voltage of the external triggering signal is with in the following vauge 620 620FG 50Hz 5MHz 21 0 DIV Figure 4 6 Sk RI 5MHz 20MHz 21 5 DIV d lope 640 640FG 50Hz 10MHz 21 5 DIV 10MHz 40MHz 22 0 DIV 4 Function of TRIG ALT switch The TRIG ALT switch is used to select alternate triggering and alternate display when the DUAL trace VERT MODE is selected the switch has on effect in the CH1 CH2 or ADD modes In the alternate triggering mode when dual trace operation is selected the trigger source alternates between channel 1 and channel 2 with each sweep This is convenient for checking amplitudes waveshape or wavefor period measurements and even permits simultaneous observation of two waveforms which are not related in frequency or period Howev 17 his setting is not suitable for phase or timing comparison measurements such m
17. icule Phosphor P34 Acceleration voltage Approx 2KV Effective screen size Trace rotation Line Power Requirements Operating Environment Accessories Voltage 110V 220V 10 selectable Indoor use Power 1 Frequency 50Hz or 60Hz Altitude up to 2000 m Instruction manual 1 Power consumption Approx 40VA 35W max Ambient temperature Probes 2 To satisfy specifications 10 10 35 50 to 95 F Maximum operating ranges 0 to 40 C 32 to 104 F Relative humidity 85 RH max non condensing Installation Category 1I Pollution degree 2 Mechanical Specifications Storage Temperature amp Humidity Dimensions 310Wx150Hx455 D mm 10 to 70 C 70 RH maximum Weight Approx 8Kg 20MHz OSCILLOSCOPE 40MHz OSCILLOSCOPE SPECIFICATIONS MOS 620 MOS 640 Sensitivity 5Vp p Positive going signal decreases intensity Frequency bandwidth DC 2MHz ZAXIS Input resistance Approx 47K ohm Maximum input voltage 30V DC AC peak AC frequency 1 2 Waveform Positive going square wave Frequency Approx 1 KHz CALIBEATION Duty ratio Within 48 52 VOLTAGE Output voltage 2Vp p 2 Output impedance Approx 1 ohm Type 6 inch rectangular type internal graticule Phosphor P31 Acceleration voltage Approx 2KV Effective screen size Trace rotation Line Power Requirements Operating Environment Accessories Vol
18. ify 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 High Voltage refer to Manual Conductor Terminal Terminal CE Declaration of Conformity We MATRIX TECHNOLOGY INC Vigool Industrial Zone ShangXue KeJiYuan BanTian Town LongGang district SHENZHEN P R of CHINA Declare under sole responsibility that the below mentioned products MOS 620 MOS 620FG MOS 640 MOS 640FG meets the intent of Directive 89 336 EEC 92 3 EEC 93 68 EEC for Electromagnetic Compatibility Compliance was demonstrated to the following specifications as listed in the industrial Technology Research institute 50081 2 Electromagnetic compatibility 50082 2 Electromagnetic compatibility 1992 Generic emission standard 1992 Generic immunity standard Part 1 Residential commercial and light industry Part 1 Residential commercial and light industry Conducted Emission EN 55022 class B 1994 Electrostatic Discharge TEC 1000 4 2 1995 Radiated Emission EN 55011 class B 1991 Radiated Immunity IEC 1000 4 3 1995 Current Harmonics EN 61000 3 2 1995 Electrical Fast Transients TEC 1000 4 4 1995 Voltage Fluctuations EN 61000 3 3 1995 Surge Immunity TEC 1000 4 5 1995 Low Voltage Directive EN 61010 1 1993 Voltage Di
19. ip 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 3 Functions of TRIG LEVEI control and SLOPE switch A sweep trigger is developed when the trigger source signal crosses a preset threshold level Rotation of the TRIG LEVEI control varies the threshold level In the direction the triggering threshold shifts to a more positive value and in the direction the triggering threshold shifts to a more negative value When the control is centered the threshold level is set at the approximate average of the signal used as the triggering source The TRIG LEVEL contro adjusts the start of the sweep to almost any desired point on a waveform On sine wave signals the phase at which sweep begins Is variable Note that if the TRIG LEVEI control is rotated toward its extreme or setting no sweep will be developed in the NORM trigger mode because the triggering threshold exceeds the peak amplitude of the sync signal When the TRIG SLOPE switch is set to the position up the sweep is developed from the trigger source waveform as it crosses the thres
20. m effective readout is 40Vpp 14Vrms at sine wave or set probe switch at 10 1 the maximum effective readout is 400Vpp 140Vrms at sine wave mode rejection ratio 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 At 5mV DIV range gt 30 1 at20MHz gt 30 1 at40MHz 1 signal output At least 20 mV DIV into a 50 ohm termination Bandwidth is 50Hz to at least 5MHz CH2 INV BAL Balanced point variation 1 DIV Reference at center graticule MODEL SPECIFICATIONS 20MHz OSCILLOSCOPE 40MHz OSCILLOSCOPE MOS 620 620FG MOS 640 640FG Triggering source CH1 CH2 LINE EXT CH1 and CH2 can be selected only when the vertical mode 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 Coupling 20 2 to full bandwidth Slope Sensitivity 20Hz 2MHz 1 0 DIV TRIG ALT 2 DIV EXT 200mV 2MHz 20MHz 1 5DIV 20MHz 40MHz 2 0DIV TRIG ALT 3DIV EXT 800mV TV Sync pulse more than 1 div EXT 1V Triggering modes AUTO Sweeps run in the free mode when no triggering input signal is applied TRIGGERING Applicable for repetitive signals of frequency 25Hz or over NORM When no triggering signal is applied the trace is in the ready state and not displaye
21. ne voltage Range Fuse T0 5A AC 220V 198 242 250V T 1 0 110V 109 121 250V 1 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 to 40 C 32 to 1 04 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 hole vents in the oscilloscope case If this equipment is used in a manner not specified by the manufacturer 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 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 when set probe switch at 1 1 the maximum effective readout is 40Vpp 14Vrms at sine wave When set probe switch at 10 1 the maximum effective readout is 400Vpp 140Vrms at sine wave Input terminal Maximum input voltage CH1 CH2 inputs 300Vpeak CAUTION To avoid instrument damage EXT TRLG IN input 300
22. ng the horizontal gt POSITION and CH2 AVPOSITION controls respectively 3 Adjust the amount of vertical Y axis deflection with the CH2 VOLTS DIV and VAR controls 4 Adjust the amount of horizontal X axis deflection with the CH1 VOLTS DIV and VAR controls 4 10 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 Connect the 10 1 probe BNC to the INPUT terminal of CH1 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 Figure 4 9 a Correct compensation b Over compensation C Insufficient compensation 4 11 DC BAL Adjustments The ATT blance of the vertical axis can be made easily 1 Set the input couping switches of CH1 and CH2 to GND and set the TRIG MODE to AUTO Then position the base line to the center 2 Turn the VLOTS DIV switch to 5mV 10mV and adjust so that the line does not move 5 MAINTENANCE WARNING The following instructions are for use by qualified personnel only 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
23. ope CH1 can be applied as horizontal deflection X axis while CH2 provide vertical deflection Y axis 2 TECHNICAL SPECIFICATIONS 20MHz OSCILLOSCOPE 40MHz OSCILLOSCOPE SPECIFICATIONS MOS 620 620FG MOS 640 640FG Sensitivity 5mV 5V DIV 10 steps in 1 2 5 sequence Sensitivity accuracy 3 5 5 Vernier vertical sensitivity To 1 2 5 or less of panel indicated value Frequency bandwidth DS 20MHz x5 MAG DC 7MHz DS 40MHz x5 MAG DC 7MHz AC coupling Low limit frequency 10Hz With reference to 100KHz 8DIV Frequency response with 3dB Rise time Approx 17 5nS x5 50nS Approx 8 75 5 5 25nS Input impedance Approx 1M ohm Approx 25pF Square wave characteristics Overshoot lt 5 10mV DIV range Other distortions and other ranges 5 added to the above value 4 DC balance shift Adjustable on panel Linearity lt 0 1 DIV of amplitude change when waveform of 2 DIV at graticule center is moved vertically a Vertical modes CH1 CH1 single channel CH2 CH2 single channel DUAL CH1 and 2 are displayed ALT or CHOP selectable at any sweep rate E ADD CH1 CH 2 algebraic addition T Chopping repetition frequency Approx 250KHz gt Input coupling AC GND DC Maximum input voltage 300Vpeak AC frequency 1KHz or lower When set probe switch at 1 1 the maximu
24. p Interruption EN 61000 4 11 1994 1 GENERAL 1 1 Description The MOS 600 family oscilloscope are dual channel oscilloscope with maximum sensitivity of 1mV DIV The time base provides a maximum sweep time of 0 2 1S DIV When magnified by 10 the sweep speed is 20nS DIV Each of these oscilloscope employs a 6 inch rectangular type cathode ray tube with red internal graticule These oscilloscopes are sturdy easy to operate and exhibits 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 620 620FG and 12KV for 640 640FGIt displays clear readable traces even at high sweep speeds 2 A trigger level lock function whith makes the triggering adjustment unnecessary 3 Alternate triggering Even an observation of two waveforms of different frequencies the waveform of the each channel is stably triggered 4 TV sync triggering The oscilloscope has a sync separator circuit for triggering of TV V and TV H signals 5 CH1 Output Terminated 50 output of channel 1 signal available on rear panel for driving frequency counter or other instruments 6 Z Axis Input Intensity modulation capability permits time or frequency markers to be added Trace blank with positive signal TTL compatible T X Y operation Set the switch to X Y Then the instrument works as an X Y oscillosc
25. position CH 2 INV 16 Released lt P gt POSITION 32 Mid position AY POSITION 11 19 Mid position x10 MAG 31 Released VOLTS DIV 7 22 0 5V DIV LEVEL 28 Locked VARIABLE 9 21 CAL clockwise position AC GND DC 10418 GND SOURCE 23 CH 1 After setting the switches and controls as mentioned connect the power cord to the AC line outlet and then continue as follows 1 Engage the 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 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 centre 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 Set the AC GND DC switch to the AC state A 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 4YPOSITION and 4 POSITION controls in appropriate positions so that the displayed waveform is align
26. tage 110V 220V 10 selectable Indoor use Power 1 Frequency 50Hz or 60Hz Altitude up to 2000 m Instruction manual 1 Power consumption Approx 40VA 35W max Ambient temperature Probes 2 To satisfy specifications 10 10 35 50 to 95 F Maximum operating ranges 0 to 40 C 32 to 104 F Relative humidity 85 RH max non condensing Installation Category 1 Pollution degree 2 Mechanical Specifications Storage Temperature amp Humidity Dimensions 310Wx150Hx455 D mm 10 to 705 70 RH maximum Weight Approx 8Kg 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 transportation 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 AC 220V or 110V setted by manufactory 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 scilloscope may be damage if it is connected to the wrong AC line voltage WARNING avoid electrical shock the power cord protective grounding conductor must be connected to ground Replace the required fuses shown below Li
27. without a trigger signal However it automatically switches to triggered sweep operation if an acceptable trigger source signal is present The AUTO position is handy when first setting up the scope to observe a waveform it provides sweep for waveform observation until other controls can properly set Once the controls are set operation is often Switchen back to the NORM triggering mode since it is more sensitive Automatic sweep must be used for DC measurements and signals of such low amplitude that they will not trigger the sweep NORM The NORM switch provides normal triggered sweep operation The sweep remains at rest until the selected trigger source Signal crosses the threshold level set by the TRIG LEVEL control The trigger causes one sweep to be generated after which the sweep again remains at rest until triggered In the NORM position there will be no trace unless an adequate trigger signal is present In the ALT mode of dual trace operation with NORM sweep selected there will be trace unless both channel 1 and 2 16 signals are adequate for triggering TV V Setting the MODE switch to the TV V position permits selection of vertical sync pulses for sweep triggering when viewing composite video waveforms Vertical sync pulses are selected as trigger to permit viewing of vertical fields and frames of video A sweep time of 2 ms div is appropriate for viewing fields of video and 5 ms div for complete frames two interlaced fields of video
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