PHILIPS. PM3311U. Test. Service Manual. CDC-311.电路图.pdf

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1、Operating Manual PM3311(U) :;t;zo;r Tab 1. Operating Manual Tab 2. Bedienungsanleitung - Tab 3. Notice dEmploi PM3325 I.E.C. Bus Operating Manual Service Manual PM3311 (U) Tab 4. Service Manual Tab 5. Modifications Tab 6. Circuit Descriptions Tab 7. Dismantling the Instrument Tab 8. Checking and Adj

2、usting Tab 9. Corrective Maintenance Tab 10. Introduction to Microprocessors Tab 11. Explanation of used Symbols Tab 12. Parts Lists P Additional Diagrams RadioFans.CN 收音机爱 好者资料库 ! b 4. i 4.1. t 4-1 GENERAL INFORMATION INTRODUCTION The PM 3311 Diqital Storage Oscilloscope is a portable, twochannel 6

3、0 MHz measuring jnstrument featuring micro-processor controlled electronic circuits. A compact ergonomic design facilitates the extensive measuring capabilities of the instrument. The versatile circuit arrangement combined with the software of the micro-processor gives a wide range of facilities. in

4、cluding: - Brilliant display. - Pre-trigger view. - Storage ot twdchannels with four different event signals per channel. - JEC-bus optional (with the aid of PM 3325). - Plotter output. - Trigger delay. - Battery powered memory back-up. Furthermore, a large 8 cm x 10 cm screen with illuminated grati

5、cule lines provides for easier viewing, a 10 kV accelerating potential giving a high-intensity trace with a well-defined spot. The oscilloscope is provided with numerous integrated circuits, which ensure stable operation and reduce lOns See also delav - 4% combined with delay In REPETITIVE ONLY 5 ns

6、 . O.lps/div 0.2 L l S . 0 . 2 sldiv 0.5 S . 60 mmldiv 2 % 25 samplesldiv - lnaccuracles (absolute or in %) relate to the indicated reference VaUe. Destgnatron Specificat:on Addrttonal InfOn C.R T. Cathode ray tube Accelerating voltage Screen size Phosphor type Graticule r nation D l 4 - 292 GH/39 1

7、0 kV 8 x l O c m I P31 (GHI Internal Triggering Source Metal backed A B EXT EXT : 10 Line subdivisions along the central vertical I axis shorter 2 mm divisions along the second, fourth, sixth and eight hori- zontal axis. - Sensitivity Internal clearly visible under normal light conditions and contin

8、uously variable Front panel screwdriver sdiustment Adiurted automatlCalV 0.3 div 0.15 div 0.3 V 0.15 V 3v 1.5 v +/- Auto d.c. a.c. TV-frame (t/l picture) at 60 MHz at 40 MHz af 60 MHz at 40 MHz at 60 MHr at 40 MHr Graticule llluminatlon Trace rotation Focus Input vertical Frequency range External Ex

9、t : 10 Slope Modes 20Hz .60MHz dc .60MHz 10Hz .60MHz Acc. to CClR 1625 Ilnes) d.c. 0 . 60 MHZ a.c. 10 H r . 60 MHz 2.5 1 M a / l 2 5 p F a.c. - 0 - d.c. 400V A only B Only Add A and B Input impedance A Max. safe input voltage dc + ac peak d.c. +as. peak Channel B can be inverted RadioFans.CN 收音机爱 好者

10、资料库 - L 4-5 Cleai Memory modes Accumulator memory I S cleared Contents of accumulafor memory are stored in selected register Input signal can be written in accumulator memory Memory system is closed Changes normal display mode (dotjoin) into display of only dots. Memory Number of memories 1 accumula

11、tor memory and 3 store memories In single trace mode Save (3x1 4 1 : 250 1 : 250 Resolution horizontal Resolution vertical Operation modes Single Write Lock Pushbutton Refreshment of accumulator mem takes place, when trigger level is reached.and time set with trigger delay has been passed. Signal is

12、 stored according to position Of trigger delay. During Waiting time accumulator. is displayed and LED NOT TRIGD lights UP. Signal in accumulafor memory is displayed on the screen. After the time set with the trigger delay the memory is over- written by new information. Signal is built-up point by po

13、int at the right-hand side of the screen and moves to the left. When accumulator Is completely filled, information is placed in register 3, next in 2. then in 1 and next in accumulator. After this. roll- mode stops, indicated by flashing RUN light. 4 times single with SAVE in memories 0.2 p ._ 0.2 s

14、idiv Dot ioin 1 V / full scale 1 V / full scale TTL comp. 0 = unblanked (pen down) 1 = blanked (pen up) 2OV PEAK approx. 100 I. B plot after A plot 1.2.8. Plot output Horizontal Vertical A P e n lift open collector output max. load 0.5V at 500 mA conf. Recurrent 5 ns . . . 0.2 s/div Max. permissible

15、 voltage Plot time Plot sequence Intarfacar IEC-Bus Roll 0.5 E ._ 60 minidiv 1.2.9. 1.2.10. 1.2.11. 1.2.12. Optional by means of a plug-in P.C. board Settings and ourput controllable from busline controller With IEC connector. IEC-Bur Local/Remote X-Y Display Y f(t) Y f(xl Bandwidth Accuracy Phase d

16、ifference 0.2 us _ 0 . 2 ddiv From time-base From YA input See YA 1 5 % Distance between signal derived from A and signal derived from B is 1125 div. 0 of stored A signal will be at centre of screen Multiple Dot ioin I S nor :n operation Tube included Display modes Memory Channel display combination

17、s Accumulator Register Covers 2 div. screen height Depends on input selection Information as stored in accumulator can be selected for storage in each of the three register memories and is displayed if display button 15 depressed. +_ 8 div 5 x Total information held In STORE 1.2 or 3 can be inverted

18、. Position Calibration output Frequency Voltage Current Power supply A L i n e voltage 2.5 kHz 3 v 6 mA Vertical position range Vertical expand Memory covers 10 cm screen height. Indicated via LED in display sectlon. Continuous 100 ._ 120 v i 10 % 220 ._ 240 V ? 10 % 50 . 400 Hz f 10 % 2.5 Deflectio

19、n in Xdirection can be derived from time base or from memory contents derived from A-input Horizontal expand x-Y selection Line frequency Power consumption Battery 4-6 Function Type Insulation For memory back-up only 2 pen light batteries of 1.5 V For instance 2 x 1.5 Philips R6P The insulation of t

20、he power supply fulfils the safety requirements of IEC 348 CI. I for metal-encased instruments Environmental characteristics Nore: The characteristics are valid only if the instrument is checked in accordance with the official checking procedure. Derails on these procedures and failure cnteria are s

21、upplied on request by the PHILIPS-organisation , n your countrv. or by M. V. PHlLlPSGLOElLAMPENFABRIEKEM, TEST AND MEASURING DEPARTMENT, EINOHOVEN. THE NETHERLANDS. Ambient temperature + 5 OC . $40 OC -10 OC ._ +40 OC -55 oc ._ +75 oc Altitude Operating Non-operatica Humidity Shock Vibration Dimensi

22、ons Weight I 5000 r n (l5OoO it) 15000 rn (50000 ft) Acc. IEC 68 Ob 30 mls 3 mis Length 460mm Width 316mm Height 154 mm Approx. 12 kg Rated range of use Operating temperature range Storage temperature in accor- dance with MIL 28800 and a maximum at 24 hours on high and low temperature In accordance

23、with IEC 68-2.13 test M lnstrumenr withstands 95 % RH over a temperature cycle of 25 OC to 40 OC Inon-operating1 Operating: half sinewave shock of 11 ms duration; 3 shocks per direction for a total of 18 shocks. Operating; vibrations in three directions with a maximum of 20 mm. per direction; 10 min

24、utes with a frequency of 5 - 25 Hz and amplitude of 1,016 mm p-$3; 10 min with a frequency of 25.55 HZ and an amplitude of 0.5 mm p-p. An extra 10 minutes of the resonant of frequency with the hqhest rise in ampli- tude. Unit mounted on vlbra- tion table without shock absorbing material. Handle and

25、controls excluded Handle excluded Feet excluded See also Fig. 1.2. f i I 4-7 t P F i g . 4 2. Dimensions - CONTENTS 6-1 6. 6.1. 6.1.1. 6.1.1 .l. 6.1.1.2. 6.1.1.3. 6.1.1.4. 6.1.1.5. 6.1.1.6. 6.1.2. 6.1.2.1. 6.1.2.2. 6.1.2.3. 6.1.2.4. 6.1.2.5. 6.1.2.6. CIRCUIT DESCRIPTIONS Blockdiagram description Acq

26、uisition The vertical channels The analog to digital converter Trigger and delay The sampling system The timebase system The acquisition control Display system Memories Dot join and plot Vertical final amplifier Horizontal final amplifier CAT. section Alphanumeric display 6.1.3. 6.1.4. 6.2. 6.2.1. 6

27、.2.2. 6.2.3. 6.2.4. 6.2.5. 6.26. 6.2.7. 6.2.8. 6.2.9. 6.2.10. 6.2.11. 6.2.12. 6.2.13. 6.2.14. 6.2.15. 6.2.16. 6.2.17. 6.2.18. 6.2.19. 6.2.20. 6.221. 6.2.22. 6.2.23. 6.2.24. Microprocessor Power supply Unit descriptions Front side unit A1 Front unit A2 Motherboard unit A3 Microprocessor unit A4 Spare

28、 unit A5 RAM unit A6 Buffer unit A7 Conversion unit A8 ACL unit A9 CCD logic unit A10 PCCD unit A I Time-base unit A12 Delay trigger unit A13 IECunit A14 DC power unit A15 AC power unit A16 Rear side unit A17 Delay line unit A18 CRT socket A19 Final arnpl. unit A20 Amplifier unit A21 Trigger unit A2

29、2 EHT unit A23 Driver unit A34 6-5 6-5 6-5 6-14 6-14 6-16 6-16 6-17 6-17 6-18 6-18 6-18 6-19 6-19 6-19 6-20 6-20 6-23 6-23 6-23 6-25 6-44 6-45 660 6-61 6-72 6-82 6-92 6-1 10 6-1 22 6-135 6-147 6-156 6-157 6-166 6-174 6-175 6-176 6-178 6-1 88 6-21 1 6-231 6-232 - 6-2 7. 7.1. 7.2. 7.3. 8. 8.1. 8.1.1.

30、8.1.2. 8.2. 8.3. 8.3.1. 8.3.2. 8.3.3. 8.3.4. 8.3.5. 8.3.6. 8.3.7. 8.3.8. 8.3.9. . 8.3.10. 8.3.11. 8.3.1 2 . 8.3.13. 8.4. 8.5. 9. 9.1. 9.1.1. 9.1.2. 9.1.3. 9.1.4. 9.1.5. 9.1.6. 9.1.7. 9.1.8. 9.1.9. 9.1.10. 9.1.11. 9.1.12. 9.1.13. 9.1.14. 9.1.15. 9.1.16. 9.1.1 7. 9.2. 9.3. 9.5. 9.6. 9.7. 9.4. DISMANTL

31、ING THE INSTRUMENT Warnings Removing the covers Access to parts for checking and adjusting procedure CHECKING AND ADJUSTING General information Recommended test equipment Preliminary settings :- Survey of adjusting elements - Checking and adjusting procedure Power supply Cathode - ray -tube circuit

32、Pre adjustment PCCD circuit Balance adjuTtments Final amplifier adiustments Vertical channels Time coefficient adjustments Triggering X-Y mode Range indication Plotter outputs Periodic and random deviations Effect of mains voltage variations Interactions Performance check CORRECTIVE MAINTENANCE Repl

33、acements Replacing single knobs Replacing double knobs Replacing carrying handle Removing the cabinet plates and the screen bezel Replacing the plug - in units Replacing the PCCD unit A1 1 Replacing the front unit A2 Replacing the LEVEL control Replacing the trigger mode switch Replacing the C.R.T.

34、Replacing the delay line unit A18 Removing the rear plate together with the AC POWER UNIT A16 Removing the DC POWER UNIT A15 Removing the mains filter Removing the EHT unit A23 Removing the vertical amplifier unit A21 Removing the trigger unit A22 Soldering techniques Handling MOS devices Special to

35、ols Recalibration after repair Instrument repackaging Trouble shooting 7-1 7-1 7-3 8-1 8- 1 8-2 8-3 8 4 7-2 8-8 8-8 8-9 8-1 2 8-13 8-15 8-1 7 8-20 8-21 8-24 8-24 8-24 8-24 8-24 8-25 8-29 9- 1 9-1 9- 1 9- 1 9-2 9-3 9 4 9-5 9-5 9-7 9-7 9-7 9-8 9-8 9-8 9-8 9-8 9-8 4 8 9-9 9-10 4 1 1 412 9-12 9-13 9.7.1

36、. 9.7.2. 9.7.3. 9.7.4. 9.7.5. 9.7.6. 9.7.7. 10. 10.1. 10.2. 10.3. 11. 12. 12.1. 12.2 13. Introduction Power-up routine Trouble shooting aids Service faultfinding software routines Trouble shooting hina Overal view of provisions and service methods Mains voltage setting INTRODUCTION TO MICROPROCESSOR

37、S A brief encounter Coming to terms System features EXPLANATION OF USED SYMBOLS PARTS LISTS (Subject to alteration without notice) Mechanical parts Electrical parts ADDITIONAL DIAGRAMS 9-13 913 4 1 5 4 1 5 9-20 9-26 - 10-1 10-1 101 104 11-1 12-1 12-2 12-8 13-2 6-3 - I 6 . 6.1. 6.1.1. CIRCUIT DESCRIP

38、TIONS - BLOCK DIAGRAM DESCRIPTION This chapter serves to explain the main functions of the oscilloscope. The working principle I S divided into four sections 6.1 1. Acquisition system 6 1 2 Display system 6.1.3. Microprocessor and software 6 1.4. Power supply Acquisition system By means of thaacquis

39、ition system the analog input signals are converted Into digital Information. Before conversion the analog signals must be adapted so that an Analog to Dlgital Converter (ADC) IS able to convert them. This system can be dtvided into the following sections: 6.1.1.1. The vertical channels 6.1.1.2. The

40、 analog todigital convenor (including P2CCD) 6.1.1.3. Trigger and trigger delay circuits 6.1.1 4 The sampling system 6 1 1 5. The time base system 6.1.1 6. The acquisition control I . r 71 I I I 1 -i I . -. -1. +. - I !( I I c- r-+-t-1 I 4 -. - . e I 0 r w 6-14 P L Y UNIT l x i G : P O W E R SUPPLY

41、UNIT 1 i 6.1.1.1. The vertical channels l u n i t A 2 l page 6- 188) The vertical channel conslst of two identml channels A and B except for the posslbillfy E All front panel settings of the vertical channels except for the CONTINUE an OFFSET cc main loop of the program of the mtcroprocessor system

42、via multiplexers. After calculation in the microprocessor, the settings are written Into the switch setting de generatss rhe slgnals t o set the acldc coupling, the-high and low ohmic attenuators and th according t o the front panel senings. Moreover these settings can be determined by the IE ?he in

43、putsignal is applied t o the channel switch via the acldc coupling, the high ohmic at convertor, the low ohmic attenuator and the amplifier. Just after the amplifier a zero in signal NULlN for PCCD-mode operation IS applied to tl For time base settings of 3600 sldiv. 0.5msIdiv - and 0.2 p l d i v -

44、5 nsldiv the channe signal t o the delay line. In dual channel mode (A and 8 ) the m-icroprocessor system generates via the switch settili A ON and E ON in such a way. that a chopped signal is applied to the delay line. ?he out! is connected t o a compensation netwurk t o correct the faulb introduce

45、d by the delay line 6.1.1.2. The analog-todigital convertor (including GCCD) (units A 7 + A10 + A 11 + A34 page This T Mn.l is the preceding sample. derived from the shift register and reconverted by DAC M-l to analog form A+ me inn,? 70 the Track and Hold Circuit, Mn-l i s subtracted from Mn to pro

46、duce a differential analog - ,_. -._ ._.r_. .- - voltage, which is then converted to digital form in the ADC and added to the preceding digital value Mi-1. I i.e. (Mn - Mn-l) + Mn.1 = Mn After this procedure, the adder cutput value Mn will be shifted into 6 shift register as a new and corrected valu

47、e. This system of digkal adding is also used, in a different way, in the P2CCD-mode as described below. For time base settings of 0.2 msldiv - 0.5 pldiv the instrriment operates in PZCCD mode. P2CCD means Profiled Peristaltic Charge Coupled Device in which an input signal can be written-in at a high

48、 speed and afterwards can be read out at a low speed. If the instrument operates in P2CCD mode, the output of the channel selector is applied to the input amplifier of the PCCD. Because of the principle of the PCCD in dual channel mode the signals -A and + B are applied as P AMP OUT 1 and P AMP OUT 2 rep. The PZCCD contents is read wt by a 78 kHz signal and written in by a Time Base Fast (TBF) pulse via the clock driver input logic. The output of the P2CCO is