Страница 1: ... JINSTRUMENTS D12 17MHz DUAL TRACE OSCILLOSCOPE INSTRUCTION MANUAL DARTRON INSTRUMENTS LIMITED CranesFarmRoad Basildon Essex Tel 02B8 2e1302 TelexBB4B I PRECISION OSCILLOSCDPESandELECTRONIC INSTRUMENTS ...
Страница 2: ...c cm the beam is switched in the alternate sweep mode The mode of operation is automaticaIIy selected by the time base switch and i s always appropriate to the sweep speed The instrument may be operated as an X Y osciI loscope both channels being independently calibrated over the range 10mV cm to 50V cm The bandwidth of the X axis is DC 1MHz and the Y axis is DC 17MHz Other facilities are availabl...
Страница 3: ...MQ161 Y amplifier 60 mV calibrator beam switching circuit MD164 Vertical output circuit MD163 trigger circuit time base circuit stabilised 20V lines stabilised EHT lines Fig 1 CRT circuit power supplies interconnection diagram Fig 2 MD161 component layout MD MD164 component layout Fig 3 MD163 component layout 2 ...
Страница 4: ...cy 3 AII other conditions as for verticaI defIecti on TIME BASE The time base may be triggered ve or ve internally externally and externally via Y1 pre amplifier output X10 applied to the external trigger socket This latter facility is useful when the external triggering signal is as low as 100mV or as high as 400V Triggering may be manual only with no trace in the absence of a triggering signal o...
Страница 5: ...lable on r ear panel 10V produces visible modulation DISPLAY A 5 flat faced post deflection accelerator cathode ray tube operated at 3 5kV overall DC coupled unblanking completely suppresses flyback re trace at all sweep speeds and DC coupled chop transition blanking eliminates background at highest brightness down to lowest sweep speeds SUPPLY 95 111V 103 121V 111 130V 190 222V 206 242V 222 260V ...
Страница 6: ...e trace Y2 only operation is obtained with the TRIG SOURCE slide switch in the SB Y2 position This is useful to obtain maximum brightness at high sweep speeds particularly when the trace is expanded X10 With the Y1 X10 output connected to the Y2 input a maximum sensitivity of 1 mV cm is obtained for signals applied to the Y1 input A co axial lead should be used for inter connecting the two amplifi...
Страница 7: ...a signal applied to the external trigger input socket the time base is triggered from the external source Triggering may be from the positive or negative going slope of the triggering waveform the option being provided by the trigger mode polarity switch When the B L slide switch is in the OFF position the screen will remain blank in the absence of a triggering signal With a triggering signal pres...
Страница 8: ...ed to the time base bistable to provide a positive going square wave of 17 volts approximately at sweep repetition rate It should be used for setting up the probe and a protruding pin is fitted for ease of connection For this purpose the TIME CM switch should be set to 1 msec cm the Y1 and Y2 couplings to DC and the attenuator to 1V cm The probe capacitor should be adjusted so that a straight hori...
Страница 9: ...ode from 1msec cm to 1usec cm The switched outputs from the collectors of TR110 TR111 TR112 TR113 are sequentially connected tá the bases of emitter followers TR114 TR115 and via terminals 7 and 8 to the vertical output amplifier The vertical amplifier is assembled on a separate printed circuit board mounted close to the base of the cathode ray tube its input terminals 19 and 20 being connected to...
Страница 10: ...m the internal sources Y1 or Y2 over S6 and from an external source over socket SKg The selected source signal is fed to the trigger amplifier comprising TR402 TR403 TR404 The output from TR403 is taken to the trigger coupling switch where filtering is introduced so that the circuit will respond to ac ac fast or TVF signals S10 the trigger coupling switch connects trigger signals to the base of ei...
Страница 11: ...trigger signal or one that is too small the bias is removed The emitter of TR419 rises and turns on TR420 R455 is now virtually connected between the negative rail and the cathode of D401 causing the hold off capacitor to be discharged rapidly TR409 now turns off and a sweep is initiated At the end of the sweep the charge accumulated on the hold off capacitor is again removed by the action referre...
Страница 12: ...tabilised line will also apply to the 20V stabilised line The circuit complements of the latter are given in brackets The high gain amplifier comprising TR424 TR425 TR427 TR428 compares the reference voltage of the Zener diode D407 D408 with the voltage at the junction of R481 R482 R487 R489 a potential divider connected between the emitter of TR426 TR429 and ground Any fluctuation of the line vol...
Страница 13: ... BRILLIANCE and FOCUS controls are connected as described above A3 is connected to R211 which is pre set during test for minimum astigmatism and optimum focussing over the whole trace The geometry control R213 is connected to the electrostatic shield betweenthe X and Y plates R213 is adjusted during test to provide optimum geometry of a test raster After deflection by the X and Y plates the beam i...
Страница 14: ... at an angle and removed through bottom of the cabinet 5 Remove mu metal shield and internal gun shield and fit to the replacement CRT Be careful nod to knock the mu metal shield as this may impair its magnetic properties 6 Fit CRT support clip but do not tighten The CRT can now be put back in position 7 Fit clip retaining screws but do not fully tighten Fit CRT base and PDA cap 8 Switch on and ro...
Страница 15: ... Colléctor TR419 Collector TR420 Emitter TR414 Emitters TR415 TR416 Collector TR415 TR416 TYPICAL VOLTAGE 10V adjustable on R141 and R189 5 6V 4 6V 13V 100V 17V 11V 17 5V 20V 20V 6V 4V 4 5V 100V TABLE 2 STABILITY OF SUPPLY LINES The stability of the supply lines can be checked by varying the supply input voltage 7 2 around the centre voltage of the primary tapping in use As an example with the pri...
Страница 16: ... attenuators to 10mV cm and apply 600mV 1kHz square wave to each channel in turn via 10 1 probe With the probe first connected to the Y1 channel adjust the probe compensation capacitor for optimum square wave response Next fit the probe to the Y2 channel and if necessary adjust C118 fór optimum square wave response If this cannot be achieved carry out the above proced ure in reverse order i e sett...
Страница 17: ... 4 Switch to AC fast and apply a 10kHz signal to give a 5mm deflection Check that it is difficult to lock this signal 5 Switch to TVF and apply a signal from the video waveform generator with an amplitude of about 2cm Check that the LEVEL contról can be adjusted to give a stable display triggered from the video frame pulse 6 Apply an external trigger signal and check that it can be locked from a 1...
Страница 18: ... 1K R460 56K 1 watt was 100R on some models R416 4K7 R461 2M2 R417 1K2 R462 3K9 C401 01 uF R418 1K2 R463 1K2 C402 680 pF R419 47R R464 27R C403 1 uF R420 47R R465 3K3 C404 10 uF 25V Elect R421 270R R466 100K C405 22 uF 25V Elect R422 1K5 R467 1K8 C406 33 pF R423 4K7 R468 12K C407 6 8 pF R424 3K3 R469 47K C408 01 uF R425 1K R470 3K9 C409 10 uF 10V Tantatum R426 68K R471 3K9 C410 220 pF R427 47R R47...
Страница 19: ...5 BC182 R45 10R D419 200V Zener 1 watt TR426 BC301 D420 200V Zener 1 watt TR427 BC182 D421 200V Zener 1 watt TR428 BC212 C9 3 10 pF D422 200V Zener 1 watt TR429 BC303 C11 4 20 pF D423 200V Zener 1 watt C13 4 20 pF D424 1N4148 X Board MD163 C15 6 8 pF D425 1N4148 completely assembled C17 6 25 pF D426 200V Zener 1 watt our Part No MD163C C19 4 20 pF D427 200V Zener 1 watt C21 3 10 pF D428 200V Zener...
Страница 20: ... 400V R102 4k7 pre set R157 10R now on X board MD163 as C432 N1 120V neon R103 2K7 R104 100R R105 10R R158 R159 R160 R161 R162 10R 10R 10R 4K7 4K7 Rear panel components R106 1M 1 R107 330K R34 1M R108 47R R163 4K7 pre set R35 1K5 2W R109 15K R164 8K2 R36 1K 1W R110 10R R165 10R R46 100K R111 6K8 R166 2K7 R112 10R R167 1M 1 C36 100 uF 275V R113 3K9 R168 330K C37 200 uF 275V R114 10R R169 10R C38 10...
Страница 21: ...ener R301 5K6 2W R215 10K pre set D106 15V Zener R302 3K3 2WM R216 6K8 D107 1N4148 R303 5K6 2UÏ R217 100K D108 1N4148 R304 3K3 2W R218 5K6 D109 not used R305 47R R219 100K D110 6 8V Zener R306 10R R220 100K D111 1N4148 R307 10R R221 10K D112 1N4148 R308 39K R222 1008 D113 1N4148 R309 220R R223 100R D114 1N4148 R310 220R R224 S O T D115 1N4148 R311 39K R225 S O T D116 1N4148 R312 220R R226 100R D11...
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