Philips PM 2505 Analog multimeter
Manufacturer:
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Model:
PM 2505
Date:
1980
Category:
Group:
Description:
Electronic VAΩmeter
Information
The analog electronic multimeter PM 2505 is a universal
measuring instrument with 62 measuring ranges. With the
optional Accessories the measuring ranges can be extended up
to 77.
The PM 2505 measures:
- ac and dc voltages from 100mV f.s.d. to 1000V f.s.d.
- resistances with a linear scale from 100£2 f.s.d. to 30M£2
f.s.d.
- ac and dc currents from 1 jUA f.s.d. to 10A f.s.d..
The ranges in the voltage, resistance and current functions
are divided in 1-3-10 steps.
Separate ranges are available for testing semiconductors ^ 1
and for continuity check with the aid of an internal buzzer ^.
The instrument is powered by two 9V batteries which enable
continuous measuring for at least 1000 hours.
Manual type:
Service Manual
Pages:
48
Size:
2.02 Mbytes (2113641 Bytes)
Language:
english
Revision:
Manual ID:
9499 475 01411
Date:
1980 03 01
Quality:
Scanned document, reading partly badly, partly not readable.
Upload date:
2016 06 19
MD5:
686ef68031af13e2a27c7a50316d4d8f
Downloads:
2049
Information
CONTENTS Page
1. Introduction 5
2. Technical data 5
2.1. Measuring performance 5
2.1.1. D.c. voltage measurements 5
2.1.2. A.c. voltage measurements 6
2.1.3. D.c. current measurements 6
2.1.4. A.c. current measurements 7
2.1.5. Resistance measurements 8
2.1.6. Semiconductor testing i 8
2.1.7. Continuity check *1 {BUZZER mode) 9
2.1.8. dB measurements 9
2.2. General data- 9
2.2.1. Conversion characteristics 9
2.2.2. Display 9
2.2.3. Warm-up time 9
2.2.4. Operating conditions 10
2.2.5. Mechanical data 10
2.2.6. Power requirements 10
2.2.7. Input terminals arrangement 10
2.2.8. Calibration 11
2.2.9. Safety 11
3. Accessories 12
3.1. Accessories delivered with the PM2505 12
3.2. Optional accessories 12
3.2.1. HF Probe PM9210 and accessory set PM9212 12
3.2.2. EHT Probe PM9246 13
3.2.3. Current transformer PM9245 13
3 2 4. Shunt PM9244 13
3 2 5. RF Probe PM9213 16
3.2.6. Carrying case PM9278 16
4. Circuit description 17
4.1. Introduction 17
4.2. Principle of operation 17
4.2.1. V— 1 V 'V' 1 + BATT and - - BATT measurements 17
4.2.2. A 1 and A 'V measurements 17
4.2.3. i2 , i and BUZZER measurements 17
4.2.4. Amplifier 17
4.3. Detailed circuit description 19
4.3.1. V— 1 V 'N' , BATT and — BATT attenuator 19
4.3.2. A zrzrz 11 and A shunts 20
4.3.3. Q, and BUZZER measurements 21
4.3.4. Amplifier and guard circuit 23
4.3.5. Protection 24
5. Acces 29
5.1. General 29
5.2. Dismantling the PM2505 29
5.3. Replacing parts 29
5.3.1. Slide switch ON/OFF or 1'''1 29
5.3.2. Range switch 29
5.3.3. Polarity indicator 30
6. Checking and adjusting 31
6.1. General - 31
6.2. Adjusting table 32
7. Parts list 34
7.1. Mechanical 34
7.2. Electrical 36
7.2.1. Capacitors 36
7.2.2. Resistors 37
7.2.3. Semiconductors 39
7.2.4. Integrated circuits 39
1. Measuring leads with test pins PM9262 12
2 HF-probe PM9210 14
3. Accessory set PM9212 14
4 HT Probe PM9246 14
5. Current transformer PM9246 14
6 Shunt PM9244 14
7. RF-probe PM9213 16
8. Blockdiagram 18
9. V—, V 'V ,‘+BATT and — BATT attenuators 19
10. A— , and A shunts 20
11 f2 1 ± 1 BUZZER measurements principle 21
12. £2 $ , BUZZER current source 22
13 Feed back circuitry 23
14. Amplifier and buffer circuit 26
15 Protection 24
16 Full scale deflection values 28
17. Measuring system 30
18 Replacing the polarity indicator 30
19. Adjusting elements 31
20. p.c. board component side 40
21. p.c. board conductor side 41
22. Function switch lay-out component side 42
23. Function switch lay-out conductor side 42
24. List of used components 45
25. Circuit diagram 45