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DATA PRECISION
Multimeter
1350
DATA PRECISION 1350 User Manual
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62-5008
MODEL
1350
START
XRia
CATHODE
WAVEFORM
R/R
01,
C16
R/R
Z7,C10,
014
TO
REFERENCE
SUPPLY
TROUBLESHOOTING
Z7-3
^
WAVEFORM
OK?
>
^^TP3
/^V
+
5%,
TP1
=
^.5V
+20%.
TP5
=
^\2.8V
+
20";^^
"H
R/R
T1,
CRU,
0R12
POWER
ON
Figure
5-4.
Power
Supply
Trouble
Shooting
Flow
Diagram
5.7
AC/DC
CONVERTER
TESTS
The
sequence
in
Figure
5-6
checks
the
operation
of
the
AC/DC
converter
of
the
Model
1350
DMM.
In
brief,
a
standard
1
VRMS
signal
(a
500
Hz
is
connected
to
the
input,
and
the
performance
of
the
meter
is
checked
as
the
input
is
conditioned
to
a
proportional
dc
level
for
the
A/D
converter
input.
The
waveforms
to
be
used
as
standards
for
these
checks
are
included
in
the
waveforms
shown
in
Figure
5-8.
Note
that
the
first
check
is
a
dc
level
check
at
the
output
of
the
operational
amplifier,
Z1.
This
veri
fies
the
operability
of
this
active
component
by
observing
an
appropriate
average
dc
output
for
the
ac
input
applied.
©
Copyright
1977.
Data
Precision
Corporation.
All
rights
reserved.
5-7
42
44
Table of Contents
Table of Contents
3
Introduction & Specifications
6
General
6
Book Plan
7
Specifications
7
AC Volts
8
Resistance
9
DC Current
9
AC Current
10
Functional Characteristics
10
Power Supply
11
Environment
11
Mechanical Configuration
11
Accessories
12
Operation
13
General
13
Unpacking & Repacking
13
Front Panel Controls & Indicators
14
Rear Panel Features
17
Signal Connections
17
Making a Measurement
18
Application Notes
19
Avoiding Ground Loops (Grounded Measurements)
19
Making "Floating" Measurements
21
Making High Resistance Measurements
21
Making very Low Voltage Measurements
21
Calibration
23
General
23
Calibration Adjustments
23
Calibration Procedure
25
Principles of Operation
27
General
27
System Block Diagram
27
System Timing
29
Signal Conditioning Details
30
DCV Signal Conditioning
30
Dcma Signal Conditioning
30
AC/DC Converter Signal Conditioning
32
Resistance Signal Conditioning
32
A/D Converter Details
32
Analog Section
32
Digital Section
34
Display
35
Power Supply
35
Reference Supply
36
Maintenance
37
General
37
Trouble Shooting Strategy
37
Access to Model 1350 DMM Assemblies & Test Points
39
Open-Case Trouble Shooting Procedures
39
Power Supply Test
42
Reference Power Supply Test
42
AC/DC Converter Tests
43
A/D Converter Tests
44
Display Tests
45
Replaceable Parts
46
Parts Lists
48
4
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DATA PRECISION 1350 Specifications
General
Brand
DATA PRECISION
Model
1350
Category
Multimeter
Language
English
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