Philips pm2521 Service Manual Download Page 1

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Summary of Contents for pm2521

Page 1: ...Automatic Multimeter PM2521 Service Manual 9499 475 01911 820407 ...

Page 2: ...nual 9499 475 01911 820407 IMPORTANT This service manual is based on instruments with a serial number DM 01 1145 and onwards In chapter 11 modifications to the PM2521 an overview is given of modifications in the earlier instruments PHILIPS ...

Page 3: ...d BEMERKUNG Die Konstruktion und Schaltung dieses Gerats wird standig weiterentwickelt und verbessert Deswegen kann dieses Gerat von den in dieser Anieitung stehenden Angaben abweichen IMPORTANT Dans votre correspondence se rapportant a cet appareil veuillez indiquer le numero de type et le numero de serie qui sont marques sur la plaqUette de caracteristiques REMA ROUES Cet appareii est i objet de...

Page 4: ... 14 1 3 4 1 R M S convertor 14 1 3 4 2 Impedance convertor 14 1 3 4 3 Active filter 15 1 3 4 4 Analog to Digital convertor 15 1 3 5 Control section 17 1 3 5 1 Microprocessor 8035 17 1 3 5 2 Interrupt controller 21 1 3 5 3 Counter 22 1 3 5 4 Analog control 22 1 3 5 5 ROM s and Address Data decoding 23 1 3 6 Display section 23 1 4 Detailed circuit description 26 1 4 1 Measuring sequence 26 1 4 1 1 I...

Page 5: ...multifunction measurements 41 1 4 4 1 R M S convertor 41 1 4 4 2 Impedance convertor 42 1 4 4 3 Active filter 43 1 4 4 4 Analog to Digital convertor 44 1 4 5 Control section 45 1 4 5 1 Interrupt controller 45 1 4 5 2 Counter and Input control 47 1 4 5 3 Analog control 48 1 4 5 4 ROM circuit and Address Data decoding 54 1 4 6 Display section 56 1 4 7 Power supply 56 ...

Page 6: ...vel ranges 66 3 4 Current ranges 68 3 5 Resistance ranges 68 3 6 Temperature ranges 69 3 7 Frequency ranges 69 3 8 Time ranges 70 4 FAULT FINDING 71 4 1 General 71 4 1 1 Service hints 71 4 1 2 Fault finding procedure 71 4 1 3 Fault finding with the signature analyser 71 4 2 Fault finding flow charts 72 4 2 1 Basic check 72 4 2 2 Function part 73 4 2 3 V 77 part 74 4 2 4 V part 74 4 2 5 Trigger lev...

Page 7: ...CIRCUIT DIAGRAMS AND P C B LAY OUT 99 7 MODIFICATIONS TO THE PM2521 115 7 1 Modifications to circuit diagrams and p c b lay outs 115 7 2 Modifications to components 120 7 3 Modifications to the adjusting procedure 120 8 COMPONENT DATA 121 8 1 Semi conductors 121 8 2 LOCMOS circuits HEF 122 8 3 OQ circuits 127 8 4 Display interface circuits 133 8 5 Operational amplifiers 137 8 6 Low power Schottky ...

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Page 9: ...id crystal display 1 3 FUNCTIONAL DESCRIPTION 1 3 1 General in common with most microcomputer based measuring instruments the Automatic Multimeter PM2521 is designed around the microcomputer integrated circuit an 8035 with a 4K external ROM The 8035 comprises a microprocessor with an internal 64 byte RAM one true 8 bit bidirectional port and two quasi bidirectional ports In conjunction with the 4K...

Page 10: ...st routine 28 Fig 22 Flow chart display output routine 32 Fig 23 DC attenuator details 33 Fig 24 AC attenuator details 34 Fig 25 I V convertor 35 Fig 26 mesusrements details 37 Fig 27 Temperature bridge 38 Fig 28 Frequency measurements 39 Fig 29 R M S convertor 41 Fig 30 Impedance convertor 42 Fig 31 Active filter 43 Fig 32 V l convertor 44 Fig 33 Interrupt controller 45 Fig 34 Counter input contr...

Page 11: ...n p c b lay out component side 102 Fig 60 Main p c b lay out conductor side 103 Fig 61 Additional components on conductor side of main p c b 104 Fig 62 Power supply circuit diagram 105 Fig 63 Analog section circuit diagram 110 Fig 64 Digital section circuit diagram Ill Fig 65 Modifications in active filter 115 Fig 66 Modifications in current source 116 Fig 67 Main p c b lay out component side form...

Page 12: ... where by means of resistors switched by relay contacts controlled from the n the attenuation factor is changed from the basic 2V range to give 20V 200V and 2000V ranges The 200mV range uses the 2V range attenuator position but the ADC is switched to the lOOmV position to give the necessary xIO gain factor From the voltage attenuator the signal is fed to an active filter which stabilises the volta...

Page 13: ...rammable current source A401 000063 flows through the unknown resistor Rx There are three basic ranges 2 200 k 2 2 20 200 M 2 2 20 Depending on the range selected manual or automatic selection the currents are determined by the signals RNGC RNGD and RNGE Irx RNGC RNGD RNGE RANGE Vx INDICATION 1mA 10V 10V OV 200 n 0 2V 200 00 n 1 mA 10V 10V ov 2kfi 2V 2 0000kf2 100 tA 10V 10V 10V 20kl2 2V 20 000kf2...

Page 14: ...the temperature probe to produce a voltage drop across it This resistance is connected as one of the ratio arms of a Thomson bridge The voltage drop is an indication of the temperature of the Pt 100 probe 50 C 200 C and is applied to the ADC for measurement circuit element principles Thomson bridge The temperature probe resistance thermometer is included in one arm of a balanced resistive 4 wire b...

Page 15: ... control is applied via an impedance convertor to the other input of the comparator The trigger level is set to a value lower than the amplitude of the signal to be measured During counting each time the amplitude of the signal from the input exceeds the selected trigger level the compartor gives an output pulse to the counter The internal counter of the IIP is also used as an overflow counter for...

Page 16: ...GER LEVEL 0 TRIGGER POINTS 1 TRIGGER POINTS ST 301 6 S20226 Fig 10 Normal trigger mode In the special trigger mode using Data Hold Probe PM9263 the PM2521 triggers in the i level mode on positive and negative crossings of the trigger level Conversely in the level mode it triggers on negative and positive crossings of the trigger level TRIGGER 1 LEVEL O TRIGGER POINTS TRIGGER points 1 A 1 i i 1 p A...

Page 17: ...1 and I A I for T2 Then the current is rectified to give a signal proportional to the R M S value of the input signal Vin In practice a more complex circuit is used to compensate for the differences in base emitter currents The two equal currents I are derived from a current bias source For electronic range selection two V to l convertors are used with common input and output devices but with sepa...

Page 18: ... difference in the time taken to charge and to discharge a capacitor about a fixed level over a fixed period of time The number of charge discharge cycles within this fixed time depends on the charge discharge current which is made proportional to the unknown input voltage to the ADC Therefore the number of pulses counted within a fixed measuring period is proportional to the unknown voltage V Cir...

Page 19: ...s of two fixed measuring periods This auto zero function is carried out with the aid of the AZ and AZ signals from the control logic When a measurement is started 1st measuring period the unknown voltage is supplied to the i input of the OQ0064 while the input is connected to zero The signal which is converted will be Vin i Voff i e I Al AI 2 Al is caused by the input voltage AI 2 is caused by the...

Page 20: ...ROM s with address data decoding facilities for program instruction storage In addition to the true bidirectional 8 line databus the 8035 has two quasi bidirectional 8 bit data ports for extra address lines and communication with the external circuits in the PM2521 Data written to these ports remains unchanged until rewritten Each line is able to serve as input or output or both even though output...

Page 21: ...uring ALE Causes jump to subroutine when current instruction cycles are complete Interrupt is disabled after a reset EA external access input held externally at logic 1 to force all program memory fetches to external ROMs RD output strobe for BUS read Enables data on to bus frorn counter output buffers PSEN Program Store Enable output to fetch data from external ROMs ALE Address Latch Enable Occur...

Page 22: ... input of the microprocessor i e no interrupt is given However when one of the four pushbuttons is depressed momentarily a logic 0 pulse is given to the middle input shown which results in a logic 0 being applied to the INT input the condition for inter rupt b Trigger level interrupts In the timing measurement mode interrupts are generated by the trigger level circuit via the comparator for starti...

Page 23: ...line In this measuring function the data input path from the ADC is inhibited b Counter output control Whatever input is selected the counter reads in the pulses after it is reset an enabled by the IJ P control The 8 bit output is connected to output buffers and applied to the databus when the counter output is enabled by the microprocessor In the frequency measuring mode the most significant outp...

Page 24: ...hat the ROM locations are first addressed whereupon the ROM responds by sending the instruction or data to the xP The addresses for the ROM s are decoded from data sent out on the 8 bit databus lines and the high order program lines from port 2 of the microprocessor These additional program lines are used to extend the address capability of the bus The decoding is achieved by bistable latches cont...

Page 25: ...OM memories by the jP reupon the ROM responds by sending the on the 8 bit databus lines and the high order tional program lines are used to extend the e ALE address latch enable output of the tP program store enable signal from the iP which on the stated of the signal line P23 jid Crystal Display interface integrated circuits the display Fig 18 Functional diagram of the control section ...

Page 26: ...e PM2521 performs some internal calibration routines and also checks the analog inputs for adjust routines Port 2 of tP This routine prepares the PM2521 for a measurement It reads the function switch setting and sets the required relays FET s and signal lines The measurement routine accepts the input signals supplies the signals to the ADC counter and juP and compares with internal calibration mea...

Page 27: ...CIMAL 7 6 5 4 3 2 1 0 20 IT OUT CALC MEAS SUP ZMON 21 C V A s Hz Trigger YFU level 22 RM2 RM1 RMO YRM 23 24 Mauto Rdown Rup YRSC 25 M7 M6 M5 M4 M3 M2 Ml MO YMN 26 27 28 dB gate Zero S Lobat CAL OL YDM 29 2A B7 BIN 3vRY RESU j 1 B0 2B 2C POS ZMON YFU YRM YRSC YMN YDM Monitor which routine IT initialisation OUT display output routine CALC calculation routine MEAS measurement routine SUP set up routi...

Page 28: ...and adjust routine a An AUTO CAL 0 1V measurement b An AUTO CAL IV measurement When making the AUTO CAL 0 1V measurement the fJiP programs the 000063 so that a current of lOOjuA flows through R606 which causes a voltage drop of lOOmV across it 100 tA x 1kl2 This voltage is supplied to the ADC and is counted by the tP stored in a RAM location and used as reference for a normal measure ment ...

Page 29: ... programs the OQ0063 to give a current of 1mA through R606 The resulting IV across R606 is also counted and stored in a RAM as a reference for further rneasurements In this case a different sensitivity of the ADC is chosen i e IV 29 5 IRX C653 C602 ...

Page 30: ...er routine Fetch calibration value routine Also used as subroutines The set up routine The measuring routine The calculation routine The display output routine Comparison routine Here the contents of a calibration measurement are compared with a normal measurement If the contents of both are equal then an internal bit is set Fetch adjustment number routine The ijP scans port P1 1 and reads the num...

Page 31: ...y settings in the D1908 SAA1060 and also controls the timing for shifting Check routine The check routine examines the Rdown and Rup bits in the range control status register If the range range max then the instrument must range up If the range range min then the instrument must range down It also ensures that in the TRIGGER LEVEL function only manual ranging is allowed 1 4 1 4 Measurement routine...

Page 32: ...erforms a fast calculation for the purpose of ranging Slow measurement calculation routine This routine converts a slow measurement result into display data and calibration data The calibration data is made to compare two results The display data is made to shift the data into the SAA1060 1 4 1 6 Display output routine Fig 22 Flow chart display output routine ...

Page 33: ...e relays The basic x 2 attenuation is given by the network comprising the series R101 section and the shunt path R101 R103 R106 Adjustment of the basic x 2 attenuation is made by the preset potentiometer R103 Preset R108 across the 10V and 10V supply provides d c balance The 200mV sensitivity is achieved by using the lOOmV range of the ADC which is activated by the RNGB input from the relay contro...

Page 34: ...03 R106 C103 C104 C105 Any d c component at the input is blocked by Cl 00 x20 attenuation is provided by R101 C106 C107 C108 switched by relay K101 X 200 attenuation by R 101 Cl 09 Cl 10 Cl 1 1 Cl 12 Cl 13 switched by relay K102 X 2000 attenuation by R 101 Cl 15 Cl 16 switched by K103 The preset capacity trimmers allow calibration of the different ranges RANGE ATTENUATION AC INPUT RANGE RELAY 200m...

Page 35: ...tine for the high current ranges is performed by software controlling the RNG C input During this routine the input current on BUS is isolated by a logic 1 in RNG C which switches off V205 and consequently FET switch V201 The logic 1 is also applied to the gate of FET V202 to earth the input to the l V convertor for the zero offset routine The high current input is protected against overloads by t...

Page 36: ...he l V convertor are Transistors V209 V210 which provide overload protection Normally the input of A201 is at virtual earth but excessive negative inputs are prevented by V208 and excessive positive inputs are prevented by V207 Zener diodes V257 V258 wich provide current protection Protection diodes V253 V254 for the shunt feedback path in series with V251 V252 which are included to block the leak...

Page 37: ...he currents I shown in the table depending on the selected signals RNGC RNGD or RNGE As stated the voltage Vx developed across Rx is applied to the ADC for measurement However the ADC input resistance is finite 10IVI12 and the small input current drawn by the ADC has to be compensated to avoid incorrect readings This is achieved as follows The voltage Vx across Rx is amplified by a factor of 2 in ...

Page 38: ...ame way as for resistance measurements in the 2kf2 range The value displayed is the voltage in forward or reverse direction across the diode in the 2V range In the diode measuring range the constant current derived from the OQ0063 is 1mA see previous section 1 4 2 7 Temperature measurements C When the C function is selected the constant current IRx is routed from pin 2 of the probe connector BU4 w...

Page 39: ... the trigger level threshold the comparator produces output pulses via the grounded base transistor V501 On comparator output pulses V502 conducts and the resistor R512 results in a drop in output of 50mV approx This is done to prevent unwanted oscillation When the negative triggering is selected control relay ReM causes V507 to conduct logic 1 which means that 10V is applied via R505 to the end o...

Page 40: ...aks cross the trigger level selected These are passed direct to the microprocessor and also to the selection gates of the interrupt controller 1 4 3 3 Trigger level measurements When trigger level is selected TL1 function switch contact routes the input signal to the voltage attenuator as for voltage measurements Contact TL3 connects the attenuated output via the impedance convertor to the input o...

Page 41: ...he a c to d c convertor is rectified and then converted into a current again by the R M S section This current is proportional to the r m s value of the input signal V Capacitor C302 is the integrating capacitor for the R M S section Capacitors C303 and C304 provide the automatic zero AZ compensation for the R M S convertor The output of the R M S convertor is converted into a voltage by resistor ...

Page 42: ...urce supplied by V306 In other measuring functions than a c control signal RE P switches on FET switch V301 which short circuits the a c path to earth The impedance convertor input is protected against excessive input voltages by Diode connected V350 which acts as a zener diode for negative voltages R304 and the gate drain junction of V302 for positive voltages For the input range from IV to i 1 V...

Page 43: ...chieved via high impedance FET switches V605 Trimmer R624 provides the offset adjustment The output from the active filter is coupled via the FET switches V606 V606 depending on whether AZ on is selected to the Vin FET V608 or the Vin FET V608 of the voltage to current convertor A602 The output of the operational amplifier A601 6 is also routed via zener diode V654 to a potential divider circuit R...

Page 44: ...od of a measurement the unknown voltage is supplied via V606 and V608 to the input pins 3 and 5 of the OQ0064 while the input pins 12 and 10 is connected to zero via V610 and V607 controlled by the AZ logic to the gate of V608 At the same time the AZsignal via V610 switches the signal path via V606 to V608 and the input In the second period of a measurement the situation is reversed The AZ logic p...

Page 45: ... a 0 pulse on the interrupt input INT During a timing measurement the S contact when switched gives a logic 1 to the pin 1 of Schmitt trigger D1917 which gives a logic 0 pulse via Cl 91 2 to reset the time measurements Trigger level interrupts Interrupts are also generated by the trigger level circuit in the timer mode for starting and stopping the pP internal counter during measuring The function...

Page 46: ...tor pulse the input with the shorter delay returns to logic 0 after its delay time However the other input remains at logic 0 for its delay period and gives a corresponding logic 1 pulse to the gate output as shown Path 2 inverts the comparator output waveform and applies it via a NAND gate to input 8 of D1918 in its original form Path 3 applies the comparator output via the clock input of the fli...

Page 47: ...period corresponding with the pos time of the duty cycles The output on D1914 10 is applied to another exclusive OR gate D1909 9 one input of which is tied to logic V The resultant output for the complete measurement is equal to the mean value of the two measuring periods The output on D1910 10 is presented to two NAND gates which in the ADC selected mode act as inverters only because of a permane...

Page 48: ...selected provide a 10V supply to one of ten independent inputs of D1916 D1918 These integrated circuits are two 8 channel analog multiplexers scanned by three address inputs P20 P21 P22 and a chip select pulse P23 Internally the analog switches have one side connected to a common output line pin 3 that is connected via a diode V901 to P24 of the juP logic 0 output The mode switches are also connec...

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Page 50: ...1 0 1 1 0 0 1 0 0 1 1 20 V 0 1 0 1 0 1 0 1 1 0 0 1 0 0 1 1 200 V 1 1 0 1 0 0 0 1 1 0 0 1 0 0 1 1 2000 V 1 0 0 1 0 1 1 1 1 0 0 1 0 0 1 1 200mV 1 1 0 1 0 1 0 1 1 0 0 0 0 0 0 0 2 V 1 1 0 1 0 1 0 1 1 0 0 0 0 0 1 0 20 V 0 1 0 1 0 1 0 1 1 0 0 0 0 0 1 0 200 V 1 1 0 1 0 0 0 1 1 0 0 0 0 0 1 0 2000 V 1 0 0 1 0 1 1 1 1 0 0 0 0 0 1 0 200 n 1 1 1 1 0 1 0 1 0 1 0 1 0 0 1 1 2Kfi 1 1 1 1 0 1 0 1 1 1 0 1 0 0 1 1 2...

Page 51: ...Vs 0 1 0 0 0 1 0 1 1 0 1 0 0 0 1 0 200 Vs 1 1 0 0 0 0 0 1 1 0 1 0 0 0 1 0 2000 V s 1 0 0 0 0 1 1 1 1 0 1 0 0 0 1 0 2 VHz 1 1 0 0 0 1 0 1 1 0 1 0 0 0 1 0 20 VHz 0 1 0 0 0 1 0 1 1 0 1 0 0 0 1 0 200 VHz 1 1 0 0 0 0 0 1 1 0 1 0 0 0 1 0 2000 VHz 1 0 0 0 0 1 1 1 1 0 1 0 0 0 1 0 C 1 0 0 1 0 1 0 1 0 1 0 1 0 0 1 1 1 1 0 1 0 1 0 1 1 1 0 1 0 0 1 1 Calibration AUTOCAL measijreme nts 1 0 0 11 0 0 1 0 I1 0 1V A...

Page 52: ...es from part 2 of the juP P20 P21 P22 P23 These lines are presented to two flip flop latches D1905 and D1906 These are D type flip flops each with six data inputs a clock input CP a master reset input MR and six buffered outputs The ROM address outpus are transferred on logic V pulses of the clock if MR is at logic 1 permanently held at 1 When at logic O MR resets all the flip flops independently ...

Page 53: ...ation addressed on the eight lines of the databus This data output function is controlled by the PSEN program store enable signal pin 9 sent by the xP This is applied to NAND gate D1 921 wired as an inverter and gives a logic 1 on NAND gate inputs D1921 12 and D1921 5 Signal P23 is a chip select input via inverter D1 921 which is used to select either D1909 or D1920 via input pin 20 lOV 5V Fig 39 ...

Page 54: ... 1 4 7 Power supply The power supply unit consists of a transformer rectifiers and a stabilizing section for the rectified voltages The voltages used are 1 5V logic 1 2 10V logic 0 3 5VR special relay voltage 4 10V 1 I stabilized voltages 5 10 V J 6 VR 1 t 1 non stabilized voltages 12V and 7 VR j The 10V 10 V is made with a 5V regulator A801 and a zener diode V855 in series NOTE It is also possibl...

Page 55: ...E PM2521 2 1 1 Removing the top cover fig 41 Place the handle in its bottom position Remove the two fixing screws at the rear which attach the top cover to the bottom cover Lever the top cover and pull it backwards Disconnect the tranformer plug which is connected to X802 2 1 2 Removing the bottom cover fig 42 Remove the top cover Remove the handle Remove the two fixing screws which attach the pri...

Page 56: ... not touch the contacts of the L C D the interconnection rubber and the display unit N3 with the fingers 2 2 2 Function switch fig 42 Remove the top and bottom cover Remove also the front assembly Bend out the two hooks and remove the printed circuit board fig 42 item 4 The function switch consist of 2 slide bodies 4 springs 4 switch contacts Remove the screws and nuts from the slide bodies The bo...

Page 57: ... h g SKW Xe o Fig 43 Removing the front Fig 41 Removing the top cover Fig 45 Removing the thermai fuse ST 342 8 Fig 42 Removing the bottom cover and front 7 POSmOWING Fig 44 Front assembly Fig 45a Removing the thermai fuse ...

Page 58: ...is chapter should be adhered too When in dividual components especially semi conductors are replaced the relevant section should be completely re adjusted To calibrate this measuring instrument only reference voltages and measuring equipment with the required accuracy should be applied If such equipment is not available comparative measurements can be made with another calibrated PM2521 However th...

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Page 67: ...ed flow charts NOTE The procedure is only intended as an aid to fault finding and abviously that the faulty component will not be found in every case Measuring instruments used Digital multimeter Oscilloscope Counter 4 1 3 Fault finding with the signature analyser When the normal fault finding does not find the fault then it is possible to use a test ROM The testrom with several tests for the PM25...

Page 68: ...521 FUNCTION V DISPLAY LIT CHECK MAINS CABLE AND MAINS FUSE V NO CHECK DISPLAY PART AFTER rflOs CAL DISAPPEARS NO CHECK DIGITAL PART FIGURES CORRECT NO CHECK DISPLAY PART SUPPLIED INPUT SIGNAL DISPLAYED NO CHECK FUNCTION PART 1 CORRECT PM 2521 5T3422 820126 ...

Page 69: ...4 2 2 Function part ST3423 820128 ...

Page 70: ...THE SHUNTING EFFECT INPUT IMPEDANCE PM2521 lOMfi NOTE MEASUREMENT ZERO IS THE O SOCKET OF THE PM2521 ST342A 820204 SIGNAL 1 PiN 6 AND 7 OF THE RMS CONVERTOR A301 NOTE OSCILLOSCOPE IN POSITION AC SIGNAL 2 TP12 NOTE OSCILLOSCOPE IN POSITION DC SIGNAL 2 NOTE OSCILLOSCOPE IN POSITION AC AMPLITUDE NOT IMPORTANT LOOK ONLY FOR DISTORTION ST3426 820209 Fig 47 Waveforms V part ...

Page 71: ...75 NOTE CORRECT RMS CONVERTOR 820203 ...

Page 72: ...76 4 2 5 Trigger level part ...

Page 73: ...4 NODE R515 COLL V501 SIGNAL 5 PIN 2 A502 SIGNAL 6 NODE COLL V504 V503 PIN 6 01910 0 0 5V 50H2 20 ms i j NOTE OSCILLOSCOPE IN POSITION AC 1 50Hz 20ms NOTE OSCILLOSCOPE IN POSITION DC NOTE OSCILLOSCOPE IN POSITION AC ST3431 820126 Fig 48 Waveforms trigger levei part ...

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Page 75: ...79 4 2 7 part CHECK V401 O SOCKET OF THE PM2521 ST 3433 820202 ...

Page 76: ...80 4 2 8 Analog part ...

Page 77: ...81 4 2 9 ADC part ST 3436 820128 SIGNAL 8 0 8 V i 10Hz NOTE OSCILLOSCOPE IN POSITION AC ST3671 Fig 50 Waveform ADC part ...

Page 78: ...82 4 2 10 Digital part SIGNAL 9 10 11 12 P20 P2T P22 P23 PIN 2 5 7 AND 10 OF D1912 ST3430 820126 Fig 51 Waveforms digital part ...

Page 79: ...84 4 2 11 Free run ST3439 820129 ...

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Page 81: ...86 4 2 12 Display part ST3441 820127 ...

Page 82: ...g5 44 Q4 12 GATE 5 f3 25 c5 45 Q5 13 1 6 a3 26 M Hz 46 Q6 14 dl 7 b3 27 k Hz 47 Q7 15 el 8 g3 28 Hz 48 Q8 16 f1 9 c3 29 Z 49 Q9 17 a1 10 4 30 S 50 Q10 18 b1 11 d4 31 V 51 Q11 19 gi 12 e4 32 A 52 Q12 20 cl 13 f4 33 53 Q13 21 2 14 a4 34 m 54 Q14 22 d2 15 b4 35 55 Q15 23 e2 16 g4 36 C 56 Q16 24 f2 17 c4 37 n 57 Q17 25 a2 18 5 38 k 2 58 Q18 26 b2 19 dB 39 M J2 59 Q19 27 g2 e5 40 n c Q20 28 c2 f5 41 n ...

Page 83: ...88 4 2 13 Power supply check ST3442 820201 ...

Page 84: ...oot 5322 462 44484 1 Carrying handle 5322 498 50126 1 5 42 5 3 FRONT ASSEMBLY Front T L potentiometer knob Function selector Window L C display Interconnection rubber Display unit N3 Ball 5322 447 74009 1 5322 414 34269 1 5322 414 44088 1 5322 381 10562 1 5322 130 94033 1 5322 290 84029 1 5322 216 74066 1 4822 520 40044 1 9 44 10 44 4 44 11 44 1 44 3 44 2 44 12 44 5 4 SWITCH ASSEMBLY N2 printed ci...

Page 85: ...6416 4 14 44 lOp connector male X801 5322 264 54061 1 15 42 5p connector male X802 5322 264 44064 1 16 42 1 0p connector female XI 901 5322 266 44028 1 17 42 8p DIN connector BUS 5322 267 54107 1 15 44 Input sockets 5322 532 14709 3 16 44 Coil L801 5322 158 10052 1 18 42 Crystal B1901 5322 242 74404 1 19 42 Reed relay K101 5322 280 24146 1 Reed relay K102 5322 280 24146 1 Reed relay K201 5322 280 ...

Page 86: ...822 116 51253 R 221 lOOE 20 265VR 4822 116 400 06 R 222 51K1 0 5 0 5W 5522 116 55577 R 223 750 1K5 245VR 5322 116 440 06 R 224 422K 1 0 4W 5322 116 55247 R 225 lOOK 1 0 4W 4822 116 51268 R 226 lOOK 1 0 4W 4822 116 51268 R 227 lOOK CARB LIN 0 05W 4822 100 10052 R 228 IlOE 1 0 4W 5322 116 54474 R 229 IlOE 1 0 4W 5322 116 54474 R 231 IMOHM 1 0 4W 5322 116 55535 R 232 IMOHM 1 0 4W 5322 116 55535 R 301...

Page 87: ...5322 116 54549 R 515 3K01 1 0 4W 4822 116 51246 R 516 IK 1 0 4W 5322 116 54549 R 517 1 OK 1 0 4W 4822 116 51253 R 518 23K7 1 0 4W 5322 116 54646 R 519 121K 1 0 4W 5322 116 54704 R 520 619E 1 0 4W 5322 116 54529 R 521 47 OE CARE LIN 0 05W 4822 100 10038 R 522 590E 0 5 0 4U 5322 116 50561 R 523 51E1 1 0 4U 5322 116 54442 R 600 lOK 0 5 0 4W 4822 116 51253 R 601 332K 1 0 4W 4822 116 51184 R 602 33K2 1...

Page 88: ...2 116 51268 R 811 IE 1 0 4W 4822 116 51179 R 1901 27K4 1 0 414 5322 116 50559 R 1902 2 7K4 1 0 4W 5322 116 50559 R 1903 27K4 1 0 414 5322 116 50559 R 1904 2 7K4 1 0 414 5322 116 50559 R 1905 27K4 1 0 414 5322 116 5C559 R 1906 27K4 1 0 4 4 5322 116 50559 R 1907 27K4 1 0 414 5322 116 50559 R 1908 27K4 1 0 414 5322 116 50559 R 1909 27K4 1 0 4W 5 322 116 50559 R 1910 27K4 1 0 414 5322 116 50559 R 1911...

Page 89: ...2 121 50562 400V 5322 125 54027 lOOV 5322 122 31574 lOOV 5322 122 34162 250V 4822 125 50088 630V 4822 121 50591 lOOV 5322 122 34064 250V 5322 125 54082 63V 5322 121 54147 lOOV 4822 122 31237 63V 4822 122 31308 lOOV 4822 122 31168 lOOV 5322 121 40323 40V 4822 122 30043 40V 4822 122 30103 40V 4822 122 30103 40V 4822 122 30103 400V 5322 121 44025 lOOV 5322 122 3413 9 40 V 4822 122 3010 3 lOOV 4822 12...

Page 90: ...1081 c 1901 22NF 80 40V 4822 122 30103 c 1902 INF 10 lOOV 4822 122 30027 c 1903 lOOPF 2 lOOV 4822 122 31504 c 1904 22NF 80 40V 4822 122 30105 c 1905 22NF 80 40V 4822 122 30103 c 1906 22NF 80 40V 4822 122 3010 3 c 1907 22PF 2 100V 5322 122 34067 c 1908 47PF 2 lOOV 4822 122 31244 c 1909 22NF 80 40V 4822 122 30103 c 1910 22PF 2 lOOV 5322 122 34G67 c 1911 22PF 2 lOOV 5322 122 34067 c 1912 INF 10 lOOV ...

Page 91: ...V5 5322 130 34981 V 257 BZX70 C12 5322 130 30755 V 258 BZX70 C12 5322 130 30753 V 259 BAW62 4822 130 30513 V 260 BAW62 4822 130 306 13 V 261 BAW62 4822 130 30613 V 263 BAH62 4822 130 30613 V 264 OA 95 4822 150 30191 V 265 OA 95 4822 130 30191 V 301 RF256A 5322 130 44418 V 302 0N528 5522 130 44405 V 303 BC 547B 4822 130 40959 V 304 BC 547B 4822 130 40959 V 305 BF324 4822 130 41448 V 306 BC 547B 482...

Page 92: ...27 5322 130 44 528 V 609 BC 547B 4822 130 40959 V 610 BC 54 7B 4822 130 40959 V 611 BC 547B 4822 130 40959 V 612 BC 547B 4822 130 40959 V 613 BC 547B 4322 130 40959 V 614 BFW12 322 130 41785 V 652 BAW62 4822 130 30613 V 654 B2X79 B7V5 4822 130 3 086 1 V 655 BZV46 C1V5 5322 130 34865 V 656 BZV46 C1V5 5322 130 34865 V 657 BZV46C2V0 4822 130 31248 V 801 BC 547B 4822 130 40959 V 802 BC 547B 4822 130 4...

Page 93: ...2 209 85915 D 1903 HEF4027BP 5322 209 14055 D 190A P8035 5322 209 86479 D 1 905 HEF40174BP 5322 209 14444 D 1906 HEF40174BP 5322 209 14444 D 1907 SN74LS161AN 5322 209 85915 D 1908 SAA1060 4822 209 80512 D 1909 2716 5322 209 54696 D 1910 HEF4070BP 5322 209 14073 D 1911 SN74LS86N 5322 209 84997 D 1912 HEF40174BP 5322 209 14444 D 1913 SN74LS10N 5322 209 84996 D 1914 HEF4011BP 5322 209 14046 D 1915 SN...

Page 94: ... OUTS SLIDER DRAWN IN FUNCTION V LEVEL SKA SK3 1 1 r 1 U ST3229 SI 0402 SLIDER Fig 54 Switch p c b iay out front view A SLIDER DRAWN IN FUNCTION V V Vrvyrms SK2 SKI X M l 1 LEVEL 5T3230 610402 SLIDER Fig 55 Switch p c b lay out rear view ...

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Page 96: ...BZX87 C20 3 P Si 4 0 I ZENER DIODES 2x BZX87 C20 ORDERING NUMBER 4822 130 30878 BZX87 C20 ...

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Page 98: ...103 Fig 60 Main p c b lay out conductor side R502 ...

Page 99: ...auto m AN c inci932 fT l C509 V505 Fig 61 Additional components conductor side of main p ...

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Page 101: ...110 Fig 63 Analog section diagram ...

Page 102: ...J 29 N1 DIG CLOCK ADC 2 dig DATA N1 dig J NIDIG ...

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Page 104: ...Ill 28 30 Fig 64 Digital section circuit diagram ...

Page 105: ... the instrument numbers DM 01 1145 and onwards For instruments with a lower number the following modifications are given 7 1 Modifications to circuit diagrams and p c b lay out The following diagrams must be used ACTIVE FILTER I Fig 65 Modifications to active fiiter ...

Page 106: ...116 Fig 66 Modifications to current source ST 3397 6111 30 ...

Page 107: ...Fig 67 Main p c b lay out component side former version ...

Page 108: ...Fig 68 Main p c b lay out conductor side former version R502 ...

Page 109: ...Fig 69 Additional components on conductor side of main p c b ...

Page 110: ...1k21 5322 116 54554 1k1 5322 116 54554 R623 12k1or11k0 12k1 5322 1 16 50572 IlkO 5322 116 54619 R231 1M or no resistor placed 5322 116 55535 1M 5322 116 55535 R232 1M or no resistor placed 5322 116 55535 1M 5322 116 55535 V251 BYX10 4822 130 30195 BY527 4822 13031509 V252 BYX10 4822 13030195 BY527 4822 13031509 V657 BAW62 4822 130 30613 BZV46 C2V0 4822 130 31248 7 3 MODIFICATIONS TO THE ADJUSTING ...

Page 111: ......

Page 112: ...0 C Moulded TO 92 soldering 10s time limit 260 C 8 2 LOCMOS CIRCUITS HEF HEF4011B QUADRUPLE 2 INPUT NAND GATE fiz fill r 2i rrn T fTi Tsi 3 Vqq Ig I7 O4 O3 Ig I5 HEF 4011 B 2 2 3 4 SS LU LU LiJ TiJ lIJ Pinning diagram Functionai diagram Logic diagram one gate HEF4023B TRIPLE 3 INPUT NAND GATE 3 1 6 4 12 0 l 5 3 r 9 1 2 5 2 8 6 j 10 11 12 8 a 3 13 9 r J r Functional diagram TZ1 F31 fTil T T T VOD 9...

Page 113: ... L LOW state the less positive voltage X state is immaterial J positive going transition 0 1 state after clock positive transition n i rr u pf 2 fiTif iri VoD 0i 0i CPi Cqi Ki j Sqi HEF 4027 B O 2 O 2 OP2 02 2 2 D2 SS LU IJJ 4J 5J 1_ 8J Pinning diagram PINNING J K synchronous inputs CP clock input L to H edge triggered Sq asynchronous set direct input active HIGH asynchronous clear direct input ac...

Page 114: ... LlJ LLl 12J L J Pinning diagram PINNING Yq 1 0 independent inputs outputs Aq to A2 address inputs E enable input active LOW Z common input output FUNCTION TABLE inputs channel ON E Az 1 0 L L L L L L L H L L H L y 2 L L H H L H L L L H L H L H H L L H H H H X X X none H HIGH state the more positive voltage L LOW state the less positive voltage X state in immaterial ...

Page 115: ... 5 D HEF 4070 B I2 0 O2 1 3 I4 Vss UJ Lll 3 j 4 j llJ Tir ill Pinning diagram TRUTH TABLE 1 2 1 L L L H L H L H H H H L H HIGH state the more positive voltage L LOW state the less positive voltage Logic diagram one gate HEF40106B HEX SCHMITT TRIGGER Functional diagram Logic diagram one inverter ...

Page 116: ...ock input LOW to HIGH edge triggered o O U Tmirnj uj ii 6 Lijn 1 master reset input active LOW Pinning diagram Oq to Og buffered outputs FUNCTION TABLE inputs output 0 CP D MR H H H J L H L 1 X H no change X X L L H HIGH state the more positive voltage L LOW state the less positive voltage X state is immaterial J positive going transition 1 negative going transition ...

Page 117: ...t 6 C comp Capacitor for compensation Capacitor compensates internal active parts 7 GND Ground Supply zero 8 n c no connection 9 n c no connection 10 1 AI Current input Input from V convertor 11 n c no connection 12 1 Al Current input Input from V l convertor 13 Vdd Supply Positive supply voltage 14 n c no connection 15 DATA Data output Outgoing data with a duty cycle depending on input voltage of...

Page 118: ...1 AC TO DC CONVERTOR vT vi _ rj Ra Rb ST2486 OQ0061 Rb c 16 3 Ra Rb C 2 15 Vin 2 Vml C 3 14 D So Ra C 4 13 Sin Vss C 5 12 p Vdd AZc C 6 n OUT AZc C 7 10 DCrms GN0 C 8 9 3PR0T Specifications of inputs and outputs ...

Page 119: ... of Rs and Rp Negative supply voltage Capacitor for the clock oscillator Range information see 12 13 Output of the compensation amplifier Compensation capacitor for the compensation amplifier and input of the compensation protection amplifier Compensation With the ampifier the current consumption of the ADC is compensated during 12 measurements Protection With the amplifier also the leak current t...

Page 120: ... conversion resistor input sensitivity IV Current output Current output Range b conversion resistor input sensitivity IV Source input for device 2 Range a conversion resistor input sensitivity 0 1V Drain input for device 2 Negative supply voltage Current input Current setting resistor Adjustment reference current Current reference output Tc setting resistor Rp determines temperature coefficient no...

Page 121: ...ompensation GND Ground 8 n c no connection 9 n c no connection IQ I A Current input 11 n c no connection 12 1 Al Current input 13 Vdd Supply 14 n c no connection 15 DATA Data output 16 n c no connection 127 Negative supply voltage Capacitor compensates internal active parts Supply zero Input from V convortor Input from V l convertor Positive supply voltage Outgoing data with a duty cycle depending...

Page 122: ...O DC CONVERTOR sj fO sT Cvi Ra Rb ST2486 OQ0061 Rb c 16 H Ra Rb C 2 15 21 Vin 2 Vinl C 3 14 3 5o Ra C 4 13 3 Sin Vss C 5 12 p Vdd A2c C 6 11 3 OUT AZc C 7 10 Crms GND C 8 9 3 PROT Specifications of inputs and outputs ...

Page 123: ...of Rs and Rp Negative supply voltage Capacitor for the clock oscillator Range information see 12 13 Output of the compensation amplifier Compensation capacitor for the compensation amplifier and input of the compensation protection amplifier Compensation With the ampifier the current consumption of the ADC is compensated during measurements Protection With the amplifier also the leak current throu...

Page 124: ...sion resistor input sensitivity IV Source input for device 2 Range a conversion resistor input sensitivity 0 1V Drain input for device 2 Negative supply voltage Current input Current setting resistor Adjustmen Current reference output Tc setting resistor Rp determ no connection no connection Positive supply voltage no connection Supply Zero Range selecting input a or b Sin So Range selecting refer...

Page 125: ... information to be supplied on the same bus lines for other circuits e g SAA1056 with 16 bits The last bit bit 17 of the data word contains the information which of the two internal latches will be loaded The input LOEX determines if the latched data of the selected latches is presented directly to the outputs or synchronized with the data select signal DUP The output stages are n p n transistors ...

Page 126: ... data transmission load pulse J LJ LJ LJ L_ 1 1 bit 16 I blt17 K y z ST 3470 Each data word must start with a leading zero The SAA1060 checks the data word for the correct length 18 bits and also for the leading zero The actual data is switched directly to the appropriate outputs For switching on a segment a 0 LOW is necessary at the appropriate data bit Data selection input DUP The logic states a...

Page 127: ... 1 Q7 12 10 1 15J EE 0 U j 1 1 14 i Q 13 1 12 1 13 j Qa Pinning diagram RATINGS Vgg 0 Limiting values in accordance with the Absolute Maximum System IEC134 Supply voltage range 00 0 3 to 7V Total power dissipation tot max 900mW Operating ambient temperature range amb 20 to 80 C Storage temperature range stg 25 to 125 C ...

Page 128: ...essor and can also be used as a programmable 17 or 20 bits serial to parallel decoder It is also capable of storing 60 bits of information DLEN DATA LEADING ZERO o cxx iiiJir aacocxxxDe LOAD ENABLE CLOCK PULSEj SIGNIFICANT DATA CLB BIT NUMBER OUTPUT BIT NUMBER OUTPUT 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 20 IS 18 Qi7 16 Qi5 Ol4 13 Qi2 On OlO O 9 08 Q Q g 5 O 4 O 3 D 2 O 17 16 15 14 13...

Page 129: ...IAL VOLTAGE COMPARATOR juA710 PIN CONFIGURATION TOP VIEW A PACKAGE T PACKAGE 1 NC 2 GROUND 3 NON INVERTING INPUT 4 INVERTING 5 NC 6 V 7 NC 8 NC 9 OUTPUT 10 NC 1 1 V 12 NC 13 NC 14 NC PRECISION OPERATIONAL AMPLIFIER ju A714 OFFSET tab OUTPUT V ...

Page 130: ...2 NC 3 OFFSET NULL 4 INV INPUT 5 NON INV INPUT 6 V 7 NC 8 NC 9 OFFSET NULL 10 OUTPUT 11 V 12 NC 13 NC 14 NC T PACKAGE 1 OFFSET NUL 2 INVERTING INPUT 3 NON INVERTING INPUT 4 V 5 OFFSET NULL 6 OUTPUT 7 V 8 NC V PACKAGE 1 OFFSET NULL 2 INV INPUT 3 NON INV INPUT 4 V 5 OFFSET NULL 6 OUTPUT 7 V 8 NC ...

Page 131: ...ut off current HIGH 3 state OZH Vcc Max Vqct 2 4V V 2 0V 20 PA Iq 2 l Output off current LOW 3 state VqY 2 0V 20 PA 2 l Input HIGH current Vcc Max V 2 7V 20 PA 1 Input HIGH current at Max input voltage Vcc Max V 10v3 0 1 mA 2 Input LOW current Vcc Max V 0 4V 0 4 mA 1 Qg Output short circuit current Vcc Max VccT 0V 15 100 mA NOTES 1 Typical limits are at 2 C and v qq 5 0 V 2 The specified limits re...

Page 132: ...GATE PIN CONFIGURATIONS TRUTH TABLE 74LS86 inputs output A B Y L L L L H H H L H H H L L LOW voltage level H HIGH voltage level 74LS244 OCTAL BUFFERS 3 STATE PIN CONFIGURATIONS TRUTH TABLE Inputs Outputs 1 a B Y a Yb m 1 L H L jnHj 1 H X H 1 Z H HIGH voltage level L LOW voltage level X Don t care Z High impedance off state ...

Page 133: ...H X X H L Asynchronous Reset Clear H L X X L H Undetermined c L L X X H H Load 1 Set H H t h H L Load 0 Reset H H t 1 L H H HIGH voltage level steady state h H IGH voltage level one setup time prior to the LOW to HIGH clock transition L LOW voltage level steady state I LOW voltage level one setup time prior to the LOW to HIGH clock transition X Don t care ...

Page 134: ... X X 1 1 L L H t X X 1 h H b Count H t h h h d X count b Hold do nothing H X 1 c X h d X Qn b H X X 1 c h d X Qn L H HIGH voltage level steady state L LOW voltage level steady state h HIGH voltage level one setup time prior to the LOW to HIGH clock transition 1 LOW voltage level one setup time prior to the LOW to HlGH clock transition X Don t care Q Lower case letters indicate the state of the ref...

Page 135: ... PGM POWER DOWN PROG RAM CHIP SELECT O 1 O o OUTPUTS DATA OUTPUTS BLOCK DIAGRAM Vcco MODE SELECTION Pins Mode CE PGM 18 OE 20 Vpp 21 Vcc 24 Outputs 9 11 13 17 Read VlL V L 5 5 OUT Standby V L Don t care 5 5 High Z Program Pulsed V to V V H 25 5 IN Program Verify V L iL 25 5 OUT Program Inhibit V L V H 25 5 High Z ...

Page 136: ......

Page 137: ...T1 39 Input pin testable using the JT1 and JNT1 instructions Can be designated the event counter input using the STRT CNT instruction 6 Interrupt input Initiates an interrupt if interrupt is enabled Interrupt is disabled after a reset Active low 8 Output strobe activated during a BUS read Can be used to enable data onto the BUS from an external device Active low Used as a Read Strobe to External D...

Page 138: ...RESISTORS INTEGRATED RESISTOR OM530 OM530 XI a a K 13 12 n 10 9 8 7 6 5 4 3 2 1 R1 R2 R3 R1 10 M R2 9M96 R3 555k555 R4 50k 506 R5 5k005 ST 3445 820208 ...

Page 139: ...xample 0001 for Unit 1 OOOA for Unit A 0075 for item 75 If units are not numbered do not fill in the four boxes see Example Job sheet Category These six boxes are intended to pinpoint the faulty component A Enter the component designation as used in the circuit diagram If the designation is alfa numeric the letters must be written starting from the left in the two left hand boxes and the figures m...

Page 140: ...Technische Service Prof Aktiviteiten Hurksestraat 42 Gebouw HBK 5600 MC Eindhoven tel 723094 Ned Antilien Philips AntHlana N V Postbus 523 Willemstad Curasao tel 37575 37475 New Zealand Philips Electrical Industries of N Z Ltd Scientific and Industrial Equipment Division Horlor Street P O Box 2097 Naenae Wellington tel 678639 Nigeria Associated Electronic Products Nigeria Ltd Ikorodu Road P O B 19...

Page 141: ...ery power supply The service manual of the PM2521 together with this information sheet comprise the service manual for the PM2521 22 CONTENTS 1 CIRCUIT DESCRIPTION 1 1 General 1 2 Charging circuit 1 3 Level convertors 1 4 Schmitt trigger 2 ACCESS 3 FAULT FINDING 4 CHECKING AND ADJUSTING 5 PARTS LIST 5 1 Resistors 5 2 Capacitors 5 3 Semiconductors 5 4 Integrated circuits 5 5 Miscellaneous CIRCUIT D...

Page 142: ...NDICATION 5T3487 82 0318 Fig 1 Block diagram battery power supply 1 2 CHARGING CIRCUIT refer to the overall circuit Fig 6 If the battery is charged by the power supply power switch in position OFF PM2521 connected to the mains the voltage on point 2 of X101 is stabilized by A101 The output voltage of A101 is the charging voltage for the battery When the temperature changes the output voltage is co...

Page 143: ...voltage of 5V on pin 5 of X101 with respect to pin 8 of X101 1 4 SCHMITT TRIGGER The Schmitt trigger circuit consists of two transistors Q4 and Q5 A401 When the voltage of the battery drops below 5 5V the Schmitt trigger switches the output pin 7 of X101 from 5V to OV with respect to pin 8 of X101 2 ACCESS Dismantling the battery power supply Remove the top cover as described in Chapter 2 of the P...

Page 144: ...4 3 FAULT FINDING The following flow chart offers a simple method of locating faults in the PM2521 22 Fig 3 Waveform collector V501 ST3488 82 0512 ...

Page 145: ...not reverse Remove the voltage from the battery terminals and refit the battery Check the discharge current 700mA Check the voltage across C503 is between H2V and H5 5V Check the voltage across C504 is between 12V and 15 5V Connect the PM2521 22 to the mains and check the charging current is between 5mA and 400mA 5 PARTS LIST 5 1 RESISTORS Ordering number Value SI Tol Item 5322 116 55615 20 5 R101...

Page 146: ...RECT V201 4822 130 30613 BAW62 V202 4822 130 30613 BAW62 V203 4822 130 44568 BC557B V301 4822 130 40824 BD140 V401 4822 130 44568 BC557B V402 5322 130 34916 BZX79 C3V9 V403 5322 130 44593 BC369 V501 4822 130 30613 BAW62 V502 4822 130 34398 BZX79 C24 V503 4822 130 30613 BAW62 V504 4822 130 30613 BAW62 V505 5322 130 34605 BAX12A V506 5322 130 34605 BAX12A V507 INTEGRATED CIRCUITS Ordering number Des...

Page 147: ...7 6 CIRCUIT DIAGRAMS RD3468 Fig 4 Main p c b iay out component side 820507 ...

Page 148: ......

Page 149: ...n the mentioned sections of the operating manual 9499 470 1 5901 are no longer valid 2 1 2 Alternating voltage measurements Ranges Maximum input voltage in range 2000 V Resolution Number of representation units Accuracy valid between 3 and 100 of range mV 200 V 2 20 200 2000 600 V 10 jaV in range 200 mV Measured value less than 0 5 of range is displayed as zero 21000 Range 200 mV up to and includi...

Page 150: ...ding C 0 01 of range C Range Input impedance 200 mV 2 V 20 ML2 60 pF 20 V 1 1 ML2 85 pF 200 V 2000 V 10 ML2 95 pF 100 dB for dc signals 80 dB for ac signals 50 Hz or 60 Hz 1 RMS convertor ac coupled 2 at range end 1 5 s without ranging 3 s including ranging In all ranges Between Hi and Lo 600 V rms Between Hi and earth 1000 V rms Between Lo and earth 400 V rms Maximum dc voltage 400 V Maximum VHz ...

Page 151: ...20 A 250 mV RMS convertor ac coupled 2 at range end 1 s without ranging 3 s including ranging Range 2 ijlA 20 mA 250 V rms Range 200 mA 20 A are not protected Imax 20 A for 20 seconds 400 V rms 560 V peak In all ranges Between Hi and Lo 250 V rms Between Hi and earth 400 V rms Between Lo and earth 400 V rms 2 1 5 dB measurements valid in function V rms Range 0 dB reference Resolution Number of rep...

Page 152: ...he front of the PM 2521 In all ranges Between Hi and Lo Between Hi and earth Between Lo and earth Maximum dc voltage Maximum VHz product 600 V rms 1000 V rms 400 V rms 400 V 10 kHz 10 100 MHz 1 10 Range 100 kHz 1 MHz and 10 MHz Manual or automatic Range 10 kHz Manual only 0 1 Hz in range 10 kHz 99999 Range Accuracy 10 kHz 100 kHz 1 MHz 0 005 of reading 0 001 of range 10 MHz 0 01 of reading 0 001 o...

Page 153: ...ten der Bedienungsanleitung 9499 470 15901 ungiiltig 2 1 2 Wechselspannungsmessungen Bereiche Maximale Eingangsspannung im 2000 V Bereich Aufibsung Anzahl der Anzeigeeinheiten mV 200 V 2 20 200 2000 600 V lOjuV im 200 mV Bereich Gemessener Wert kleiner als 0 5 des Bereichs wird als Null angezeigt 21000 Fehlergrenze geltend zwischen 3 und 100 des Bereichs Bereich 200 mV bis einschliesslich 200 V 40...

Page 154: ...d Erde 1000 Vgff Zwischen Lo und Erde 400 Veff Maximale Gleichspannung 400 V Maximales VHz Produkt 10 2 1 4 Wechselstrommessungen Bereiche Maximaler Eingangsstrom im 20 A Bereich Auflosung Anzahl der Anzeigeeinheiten Fehiergrenze geltend zwischen 3 und 100 des Bereichs Temperaturkoeffizient Spannungsabfall iiber Shunt HA 2 20 200 mA 2 20 200 A 2 20 10 A 1 nA im 2 zA Bereich Gemessener Wert kleiner...

Page 155: ...l der relativen Referenzfunktion mit Drucktaste ZERO SET auf der Frontplatte des PM 2521 0 1 dB Gemessener Wert kleiner als 57 7 dB wird als 99 9 dB angezeigt 999 Signale Frequenz Genauigkeit 31 7 dB 47 dB 40 Hz 20kHz 20 kHz 100 kHz 0 2 dB 1 dB 50 dB 31 7 dB 40 Hz 20kHz 2 dB 57 7 dB 50 dB 40 Hz 20kHz 3 dB 47 dB 40 Hz 500 Hz 1 5dB 0 02dB C Signale Impedanz 0 1 8 V 20 Mfi 60 pF 1 8 18 V 11 Mfi 85 pF...

Page 156: ... Torzeit Umsetzrate Triggerart Zahlerempfindlichkeit Triggerpegeljustierung Auf positiv gehende Dberschreitungen des Triggerpegels Auf negativ gehende Dberschreitungen des Triggerpegels DC bis 1 MHz 150mVpeak 10 MHz bis 1 0 MHz 300 mVpeak Auflosung 1 mV Mittels Daumenrad auf der Frontplatte des PM 2521 ...

Page 157: ...ans les sections mentionnees du mode d emploi 9499 470 15901 ne sont plus valables 2 1 2 Mesures de tension alternative Gammas mV 200 V 2 20 200 2000 Tension maximale d entree dans la gamme 2000 V Resolution Nombre d unites de representation Precision valable entre 3 et 100 de gamme 600 V lOjuV dans la gamme 200 mV Une valeur mesuree inferieure a 0 5 de gamme est affichee comme zero 21000 Gamme 20...

Page 158: ... gamme Dans toutes les gammes entre Hi et Lo 600Veff entre Hi et terre 1 000 Veff entre Lo et terre 400 Vgff Tension maximale continu 400 V Produit VHz maxi 10 fiA 2 20 200 mA 2 20 200 A 2 20 Courant maximal d entree dans la gamme 20 A Resolution Precision Coefficient de temperature Perte de tension par le shunt Detecteur alternatif Facteur de crgte Temps de reponse 10 A 1 nA dans la gamme 2 Valeu...

Page 159: ...100 kHz 0 2 dB 1 dB 50 dB 31 7 dB 40 Hz 20kHz 2 dB 57 7 dB 50 dB 40 Hz 20 kHz 3 dB t47dB 40 Hz 500 Hz 1 5dB 0 02 dB C Signaux Impedance 0 1 8V 20 MJ2 60 pF 1 8 18 V 1 1 Mn 85 pF 18 600 V 10 Mfi 95 pF Rejection en mode common CMR R Detecteur alternatif Facteur de crete Temps de reponse Reglage de reference relative Tensions maximales d entree 100 dB pour signaux continus 80 dB pour signaux alternat...

Page 160: ... 01 d affichage 0 001 de gamme Gamme Temps de porte 10 kHz 10 s 100 kHz 1 s 1 MHz 100 ms 10MHz 10 ms Gamme Taux 10 kHz 1 conv IO s 100 kHz 1 MHz 10MHz 1 conv s Par depassement positif du niveau de declenchement Par depassement negatif du niveau de declenchement continu a 1 MHz 150 mVcrgte 10 MHz a 100 MHz 300 mVcrgte Resolution 1 mV Reglage du niveau de declenchement Avec bouton molet6 a I avant ...

Page 161: ...rt list Chapter Part Old code number New code number 5 2 Carrying handle 5322 498 50126 5322 532 14709 r 9 F S f J 5 3 Front 5322 447 74009 5322 447 7OO0S J 5 3 TL Potentiometer knob 5322 414 34269 5322 414 30035 5 5 1 Input sockets 5322 532 14709 5322 267 30435 5 5 1 Switch for high current ranges 5322 492 62405 deleted 5 5 2 10A shunt 5322 115 84046 5322 115 80115 I z c g JE c S Additions to the...

Page 162: ......

Page 163: ...74009 5322 447 70053 Test prod red 5322 264 20064 5322 264 20046 2 ROM s 2x2k lx4k From serial number DY 02 6611 onwards the PM 2521 02 is supplied with one 4k ROM POS NR Description Ordering code Replaced by Description D1909 ROM 2k 5322 209 54696 obsolete D1920 ROM 2k 5322 209 54699 5322 209 81665 ROM 4k If an instrument with 2x2k ROM s has to be modified to an instrument with a 4k ROM proceed a...

Page 164: ......

Page 165: ...3010 This is the standard version see the service manual 2 2 PM 2521 02 from serialnumber DY 3010 onwards The instruments comply with the VDE safety specifications Modifications with respect to version PM 2521 01 Service parts list Part Code number Mains connector 5322 267 30434 Front 5322 447 70053 TL Potetiometer knob 5322 414 30035 Input sockets 5322 267 30435 Switch for high current ranges del...

Page 166: ......

Page 167: ...20 ROM 2K 5322 209 54697 5322 209 81665 ROM 4K If an instrument with 2x2K ROM s has to be modified to an instrument with a 4K ROM proceed as follows Unsolder the two soldering spots see fig 1 and 2 item 1 Repair the track interruption see fig 1 item 2 Place a jumper Ordering code 5322 263 64007 see fig 1 item 3 Fig 1 Main p c b iay out component side Fig 2 Main p c b iay out conductor side ...

Page 168: ...t 5322 447 70071 Function selector 5322 414 40016 Adjust knob 5322 414 40019 Knob for mains switch 5322 414 20034 Knobs for range selection 5322 414 60037 Handle 5322 498 54105 2 5 PM 2521 22 and PM 2521 23 battery versions of the PM 2521 The difference between the PM 2521 22 and the PM 2521 23 is that the PM 2521 22 is delivered in the old colours and the PM 2521 23 in the new colours Therefore t...

Page 169: ...ocks within the three main sections analog control and display and the basic signal paths are shown in block diagram Fig 2 1 2 1 Analog section The analog section comprises the following input measuring signal facilities a A voltage measuring path consisting of A C D C voltage attenuator R M S convertor 00 0061 Active filter ADC OQ 0064 00 0060 b A current measuring path consisting of A C D C acti...

Page 170: ...PHILIPS ...

Page 171: ...Automatic Multimeter PM2521 Repair by Signature Analysis Instruction Manual 9499 473 00111 820701 PHILIPS ...

Page 172: ...Fault finding hints 3 9 How to order the signature analysis testrom and the documentation 3 10 Testing the PM2521 4 10 1 General 4 10 2 Free Run test 5 10 3 Ram and I O test testO 7 1 0 4 Visual LCD test test 1 9 10 5 Switch decoding test test 2 10 10 6 Relay and FET test test 3 11 10 7 Static relay and FET test test 4 12 10 8 Counter and counter input control test test 5 14 10 9 Interrupt control...

Page 173: ... PM2521 with complex feedbacks can be difficult But opening the feedbacks paths and using the signature analyser makes fault finding easy 3 CHECKWITH A SIGNATURE ANALYSER The signature analyser checks the digital part of the PM2521 by detecting the bit stream at various circuits nodes and displaying them as hexadecimal signatures To do this the PM2521 supplies the signature analyser with three gat...

Page 174: ...re short circuit then two segments will be lit simultaneously In this test signature analysis is not provided Test 2 switch decoding test Test 2 activates the circuit necessary for reading the function switch and the AUTO DOWN UP 10 Amp input bus and the battery low input Signatures can be measured on IC s D1912 D1916 D1919 and on I O port 2 P20 P21 P22 P23 and P The signatures on P25 depends on t...

Page 175: ...ing the bus system between the microcomputer and the ROMs This is done by removing the ROMs The microcomputer is now forcing in some instruction that will cause a repeated increment of the address lines So at this point the microcomputer is scanning the whole address field With START and STOP lines from the signature analyser both connected to the most significant address bit and triggering on dif...

Page 176: ......

Page 177: ...emove D 1909 and D 1920 ROMs 2 Signals with a seem to be logic 0 or logic 1 but still show activity blinking led 3 Reference logic 0 0000 logic 1 8P54 7AV1 AO GND vcc AJ 7 A2 6 A3 H10F 5 A4 I5 H 53HH 1 3A9A 4 AS lP2l 10F6 mnfl 3 A6 im CAAt 2 A7 A218 1 1 0751 52BH P20 EID 17 0001 Iral IS 8P54 VPP OE CE 1 7A33 AO GND VCC A2 I HH53 A3 H10F AA A6 1 0108 6 FB1C 7 1 1 P20l 8r H I31l 1 0001 E2E 19 nVPP O...

Page 178: ...5 6 ...

Page 179: ...tting Edge Testpoint Signalname start Ti neg TPM P17l D 1904 pin 34 stop d pos TPM 1P17I D1904pin 34 dock S pos TP15 ALE D1911 pin 11 ground TP1 Logic 0 NOTE 1 The testrom placed in the D 1909 socket 2 Reference logic 0 0000 logic 1 HCH5 3 Reading display La 10V ...

Page 180: ... 5V lOV ...

Page 181: ...1 3 Reading on display AH segments will be filled ST3A73 820301 CONNECTION TABLE CONNECTIONS D2901 D2902 D2903 D2901 LX display D2902 LX display D2903 LX display Output no Pin no Char Pin no Char Pin no Char Pin no 01 9 2 3 22 a5 42 02 10 __ 3 d3 23 b5 43 03 11 4 e3 24 g5 44 04 12 GATE 5 f3 25 c5 45 05 13 1 6 a3 26 M Hz 46 06 14 d1 7 b3 27 k Hz 47 07 15 el 8 g3 28 Hz 48 08 16 f1 9 c3 29 Z 49 09 17...

Page 182: ...H DECODING Setting Edge Testpoint Signalname start Ti neg TPM P17 D1904pin34 stop pos TPM P17 D1904pin34 clock pos TP15 ALE D1911 pin 11 ground TP1 Logic 0 NOTE 1 The testrom placed in the D 1909 socket Both ROMs removed 2 Short circuit TP10 and TP1 1 3 Reading on display S 4 Reference logic 0 0000 logic 1 C66C POSITION i SIGNATURE Vr 1 3AU8 1 7FUF Hz 45AU TRIGGER LEVEL 8876 S 968A c 1 251C w 1 13...

Page 183: ...15 D1903 pin 7 D1903 pin 2 TP1 P17l PIZJ ALE AZC P AZ Logic 0 NOTE The testrom placed in D 1909 socket Both ROMs removed 2 Short circuit TP10 and TP 11 3 Reading display L3 4 Reference logic 0 000 logic 1 593 A 09 QIS DATA oil CLOCK 015 010 01 DLEN4 014 013 Q2 08 03 012 VEE 07 06 05 04 LOEX VCC DUP VEE rP2ll 0000 D1908 SAA1060 LOGIC 0 0000 LOGIC 1 593A ...

Page 184: ... PO t4 mV PO t4 mA P O t4 V P O t4 mA PO t4 V PO t4 mA PO t 4 V Hz P O t4 KHz A P O t4jLiA PO t4 KHz PO t4juA PO t4 MHz PO t4jUA P O t4 MHz P O 14 mA Trigger level gate P O 14 V With lead in the A bus gate PO 14 V PO t4 mA gate PO t4 V P O 14 mA gate PO 1 4 V PO 14 mA s P O t4 PO t4 s C PO t 4 C s PO t4 PO t 4 s Diode P O t4 V PO t4 s i2 PO t4 n P O t4 K 2 PO t4 Kl2 PO t4 KQ P O t4 Mi2 PO t4 M 2 N...

Page 185: ...onvertor current offset In the P3 and the P7 tests these IZERO measurements are simulated see relay table on page 52 and page 53 of the PM2521 service manual In all these tests PO to P7 the AZ status can be changed This means that the input of the ADC can be selected To do this push the button Thanks to this it is possible to measure the input voltage or the voltage across the R606 resistance on t...

Page 186: ...uit TP 10 and TP 11 3 Reading on display L5 4 Connect point 1 of D1910 to logic 0 5 Adjust with R502 the signature on D 19 11 point 2 to 0000 6 Select the signature on point 15 of D 1903 with the button 154H 7 Reference logic 0 0000 logic 1 3UH7 A CLOCK AOC s 01 IJ C L 3niAn j 1 I JCI903 IToop f 4 11 1 1 Sracii ADC u R IALEI 0000 ICT ADCPIOl PFFQ IaZC P PISI COUNTER INPUT CONTROL f Ni anaI 2 dE_ l...

Page 187: ... li neg if pos TPM TPM TP15 D1903 pin D1903 pin TP1 fP17 ml ALE 7 azc p1 2 AZ logic 0 NOTE 1 Testrom placed in D 1909 socket Both ROMs removed 2 Short circuit TP 10 and TP 11 3 Reading on display LB 4 Adjust with R502 the signature on 0191 1 point 2 to 0000 5 Set the PM2521 in the function V r r 6 Reference logic 0 0000 logic 1 A4A7 D1904 P803S ST 3478 820309 ...

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