DATA PRECISION 1350 User Manual

62-5008
MODEL 1350
POWER SUPPLY
TESTS ARE OK
CR15
CATHODE
= - 6.4V ?
R/R A1. CR15
R/R Zl. AT R36
R/R R8, R9, RIO
IR12, R13)
R/R R8, R9, RIO
TO AC/DC TROUBLE SHOOTING
Figure 5-5. Reference Power Supply Trouble Shooting Flow Diagram
5.8 A/D CONVERTER TESTS
5-8
©
The A/D Converter is instrumented in a single 10, Z2. The sequence in
Figure 5-7 checks the operation of that component by tracing the perfor
mance for the conversion of a 1-volt do input. The diagnosis checks the
operation of the phase switching by examining the waveform at the input
to the pre-integration buffer amplifier. The switching action should illus
trate the 3 conversion steps that result in three levels at this point: 100 mV
(negative) for lOOmsec; 100 mV (positive) for 100 msec; and 0 mV for
200 msec. The waveform at the integrator output is then checked to verify
the integrator performance, and the waveforms in Figure 5-8 are arranged
so that the relative timing of the input and output of the integrator can also
be checked. (A dual-trace oscilloscope is recommended for this purpose.)
Copyright 1977. Data Pracision Corporation. AM righ

DATA PRECISION 1350 Specifications

General

Brand	DATA PRECISION
Model	1350
Category	Multimeter
Language	English