General - Datron 1062 Service Handbook

ii
Section
Title
Page
3.2.3.6
1st Null
Detector
25
3.
2.3.7
2nd
Null Detector
25
3. 2. 3.
8 Reset Period
25
3.3
OPTION
10
AC ASSEMBLY 27
3.3.1
General Principles
27
3.3.2
Preamplifier and
Scaling
27
3.3.3
RMS
Converter
28
3.3.4
High Frequency Compensation
29
3.3.5
Frequency
Detection
29
3.3.6 Test
29
A3.3
OPTION
12
AC ASSEMBLY
A27
A3.
3.1
General Principles
A27
A3.
3.
2 Preamplifier and Scaling
A27
A3.
3.
3
RMS
Converter
A28
A3. 3.4 High
Frequency Compensation
A29
A3.
3.
5 Frequency
Detection
A29
A3.3.6 Test
A29
3.4
OHMS ASSEMBLY
30
3.4.1
Low
Drift
Voltage Follower 30
3.4.2
Constant Current Source 30
3.4.3
Test
31
3.5
CURRENT
ASSEMBLY
31
3.5.1
Current Measurements
32
3.5.2 Test
32
3.6
REAR
INPUT/RATIO INPUT
32
3.6.1 General 32
3.6.2
Front Panel/Rear Panel Input
32
3.6.3 Ratio
32
3.6.4 Test 33
3.7
ANALOG OUTPUT
33
3.7.1
General 33
3.7.2 Description
33
3.8
DIGITAL
ASSEMBLY
33
3.8.1
Processor and
Memory
33
3. 8. 1.1
Software Overview 34
3.8.1
.2
The Two-Phase Clock
35
3.8.1.3
RAM/ROM
Circuit
36
3.8.2
CMOS
Address Decode and Input/Output
Circuits
36
3.8.3
Analog
to Digital
Conversion
(Digital
Section)
39
3.8.3.1
General
Principle
39
3.8.3.2 Preset
Procedure
39
3. 8. 3.
3
A-D
Measurement Sequence
41
3. 8. 3.
4
Master
Clock and
Line Locking
41