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INSTRUCTION
MANUAL
Digital MuItlm*ter
Mod&172A.l73A
ILLUSTRATIONS
GURE NO.
TITLE
PAGE
1-l
l-2
l-3
l-4
2-l
2-2
2-3
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3-7
3-a
3-9
3-10
3-11
3-12
4-l
4-2
5-l
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5-4
5-5
5-6
5-J
5-a
5-9
5-10
5-11
5-12
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6-l
6-2
J-1
Model
l73A
Front
Panel
.......................
1-3
Bottom
View
Showing
Line
Cord.
...................
l-4
Tilt
Bail
Positions.
........................
l-5
Dimensional
Data
..........................
1-6
Rear
Panel
Showing
Current
Fuse.
..................
2-2
Model
1728
Rechargeable
Battery
Pack
................
2-4
Installation
of
Battery
Pack
....................
2-5
Front
Panel
Pushbutton
Selection
..................
3-3
Typical
Model
172A Current
Display
(DCnA).
.............
3-5
Typical
Model
l73A
Current
Display
(ACmA).
.............
3-6
Typical
2 WIRE Resistance
Measurement.
...............
3-7
Typical
4 WIRE Resistance
Measurement.
...............
3-V
Semiconductor
Diode
and Transistor
Testing
.............
3-10
Use of
Multimeter
Off
Ground
....................
3-11
Model
1722 Digital
Output
Interface.
................
3-14
Installation
of
Model
I722
.....................
3-15
Connector
Pin
Identification
For
~1006
and PllOl
..........
3-17
Card-Edge
Connectors
(Model
1727 Cable
Set).
............
3-17
Location
of
Jumpers
and Pull-ups
on Model
1722
...........
3-18
Model
1010 Single
Rack Mounting
Kit.
................
4-2
Model
1017 Dual
Rack Mounting
Kit
.................
4-4
Overall
Block
Diagram
of
Model
172A/l73A
..............
5-2
Simplified
Block
Diagram
of
Signal
Conditioning
Circuits
................
5-2
Simplified
Schematic
of
DC Attenuator.
.....
5-6
Simplified
Schematic
of
AC/DC Converter.
.....................................
5-7
Simplified
Schematic
of
173A
I/V
Converter
5-8
Simplified
Schematic
of
Model
l72A
I/V
Converter
5-8
Simplified
Ohms Converter,
Two-Wire
Ohms Configuration
.......
5-10
Four-Wire
Ohms Measuring
Technique
.................
5-10
Simplified
Schematic
of
Clamp.
...................
5-12
Simplified
Schematic
of
Active
Filter.
.............
., . 5-12
Simplified
Block
Diagram
of
A/D Converter.
.............
5-14
A/D Converter
System
Timing
....................
5-15
Simplified
Schematic
of A/D Buffer
5-16
Simplified
Schematic
of
the
A/D Converter,
..............................
5-17
Simplified
Schematic
of
669 kHz Oscillator
...........................
5-19
Simplified
Schematic
of Reference
Supply
5-20
Digital
Display
Multiplex
Scheme
.......................................
5-22
Model
1722 Block
Diagram
.
5-24
Location
of Calibration
fidjustments.
................
6-10
Location
of
Connectors
and Test
Points
...............
6-14
TOD and Bottom
Cover
Assembly
...................
7-3
iv
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