Philips - PM 2420 - Digital multimeter
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Philips PM 2420
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PM 2420
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Information
Instrument PM 2420 is a compact multi-range DVM of the so-called RAMP type. Characteristic of the RAMP principle is the simplicity of operation, which makes this DVM ideally suitable for use as a general purpose instrument.
Operation is facilitated by the possibility of selecting all measuring ranges by means of a single knob. It is obvious that the combination of digital read-out system and monoknob range selection ensures fast and simple, yet accurate reading.
1 Manual
Service and user manual
Manual type:
Service and user manual
Pages:
82
Size:
22.6 MB
Language:
english
Revision:
Manual-ID:
9448 024 20011 9499 480 00711
Date:
Quality:
Scanned document, all readable.
Upload date:
July 31, 2020
MD5:
56c54105-912e-e3c7-eca6-00caadd489da
Downloads:
614
Information
I. INTRODUCTION 5
II. TECHNICAL DATA 5
m Accessories 8
IV. WORKING 9
A. . Principle 9
B . Description of the block diagram 10
DIRECTIONS FOR USE
V. INSTALLATION 19
A. Adjustment to the mains voltage 19
B. Fuse 19
C. Earthing 19
VI. OPERATION 21
A. Switching-on 21
B. Calibration 21
C. Measuring 21
SERVICE DATA
VII. CIRCUIT DESCRIPTION 23
A . General 23
B Power Supply 23
C . Input circuit 24
D . Analogue-to-digital Converter 30
E . Logic circuit 33
F . Gate 33
G. Clock Oscillator 34
H . Polarity indication 34
J. Scaler of four 35
K Counter 35
L . A stable multivibrator 37
M . "1000" indication 38
DISASSEMBLING 39
A. Housing 39
B. Bottom panel 39
C. Text plate 39
DC. REPLACING PARTS 39
A. Front frame 39
B. Rear frame 40
C. Monoknob 41
D. Selector switch 42
E. Printed wiring boards 42
F. Electrical components 44
X. MAINTENANCE 45
XI. SURVEY OF ADJUSTMENTS 46
XII. CHECKING AND ADJUSTING 48
A Power Supply 48
B. Clock Oscillator frequency 49
C. Zero adjustment 49
D. Full scale adjustment 49
E. Adjusting the DC voltage ranges 49
F. Adjusting the ranges 50
G. Adjusting the AC voltage ranges 51
H. Checking the current ranges 51
XIII. TROUBLE SHOOTING 53
XIV. LIST OF PARTS 61
A. Mechanical 61
B. Electrical 62
XV. FUNCTIONAL BLOCKS 70