DATA PRECISION 1350 User Manual

62-5008 MODEL 1350
4.8 REFERENCE SUPPLY
The A/D reference voltage when not in ohms operation is derived from the
6.4V reference zener, CR15. CR15 is current regulated as discussed in
paragraph 4.7 by Z1 A. The 6.4 volt reference is attenuated to a lOO.OmV
difference across R9 by the string R8, R9, and RIO. This tOOmV refer
ence is approximately centered -i-50mV and -50mV around Analog
Common by choice of the values of RB and R10. Individual meters may
include R31 and R32. R31 will raise the display readings and R32 will
lower them, when required to compensate for wide variations from nomi
nal values of the reference diode voltage. R7 is the calibrating adjustment
of the current in R9 and thereby A/D converter gain. (See Chapter 3.)
4-10
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Copyright 1977. Data Precision Corporation. All rights reservad.

DATA PRECISION 1350 Specifications

General

Brand	DATA PRECISION
Model	1350
Category	Multimeter
Language	English