DM 501A
TABLE
OF
CONTENTS (cent)
THE rOLLOWING
SERVICING INSTRUCTIONS ARE FOR USE BY QUALIFIED PER-
SONNEL ONLY. TO AVOID PERSONAL
INJURY,
DO NOT
PERFORM
ANY SERVICING
OTHER
THAN
THAT CONTAINED IN OPERATING INSTRUCTIONS UNLESS YOU ARE
QUALIFIED TO DO
SO.
SECTIONS
THEORY OF OPERATION
Page
Introduction
3-1
Voltage Input Circuits
3-1
dB Input Circuitry
3-2
Current Input Circuits
3-3
Ohms Converter
3-4
Ten'perature Measurement Circuitry
3-5
Ana'on-to-Digital Converter
3-5
Auto-Zero Period
3-5
Measure Interval
3-5
Override Period
3-5
Display Driver
3-7
Clock
3-7
Decimal Point Circuitry
*
3-7
Power
Supply
3-8
SECTION 4
CALIBRATION PROCEDURE
Performance
Check
Procedure
4-1
Introduction
4-1
Calibration
Interval
4-1
Services
Available
4-1
Test
Equipment Required
4-1
Front Panel Input Accuracy
Checks
4-2
Rear Interface Accuracy
Checks
4-4
Adiustrrmmt Procedure
4-11
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