Fluke 732a User Manual

NOTE
This manual
documents
the
Model
732A
and
its
assemblies
at the
revision
levels
shovwn
in
Appendix 7A.
If
your
instrument
contains
assemblies
with
different
revision
letters, it will
be
necessary
for you to
either
update
or
backdate
this
manual.
Refer
to
the
supplemental
change/errata
sheet
for
newer
assemblies,
or
to
the
backdating
sheet
In
Appendix
7Afor
older
assemblies.
For
the
benefit
and
convenience
of
its
customers,
Fluke
Corporation
(Fluke)
has
reproduced
this
copy
of
a
manual
which
is
no
longer
in
production.
This
manual
has
not
been
edited
or
updated
since
the
revision
date
shown
on the
lower
left
fiend
corner
of
the
^rst
pege.
Fluke
will
not
be
liable
for
any
claims,
losses
or
damages
of
any
kind
incurred
by
any
user
arising
from
use
of
this
manual.
732A
DC
Reference
Standard
Instruction
Manua
IFLUKE
P/N
645051
MAY 1983
«19S3,
John
Fluke
Mfg.
Co.,
Inc.,
all rights
reserved.
LUho
in
U.S.A.

Fluke 732a Specifications

General

Type	DC Voltage Reference Standard
Output Voltage Accuracy (10 V)	±2 ppm
Output Voltage Accuracy (1.018 V)	±2 ppm
Accuracy	±2 ppm
Storage Temperature Range	-40 °C to 70 °C
Output Voltage	10 V
Operating Temperature	23 °C ±1 °C
Dimensions (H x W x D)	3.5 in x 19 in x 16 in

Summary

Introduction and Specifications

Introduction

Specifications

Detailed technical specifications for the 732A, including output voltages and accuracy.

Operation

Installation

Guidance on bench or rack mounting the 732A, referencing accessory kits.

Front and Rear Panel Features

Details on controls, connections, and indicators on the front and rear panels of the 732A.

Operating Notes

Backup Operating Power

Explanation of how the internal battery maintains operation when AC power fails.

Battery Charging

IN CAL Indicator and RESET Terminal

Guarded Operation

Explanation of guarded operation to reduce errors caused by common mode voltages.

Minimizing Error Sources

Techniques to minimize errors affecting inherent accuracy and stability.

Thermal Errors

Long Term Stability

How to determine and track long-term stability for accuracy and precision.

Operation Procedure

Procedure to prepare the 732A for initial operation, including power and stabilization.

Theory of Operation

Overall Functional Description

Circuit Description

Description of the 732A's circuitry, referencing the functional block diagram.

Power Supplies (A3 and A4)

Details on the two-stage cascaded regulator system powering the 732A circuitry.

Voltage Monitor

Reference Circuit (A5)

Description of the highly stable series-pass voltage regulator enclosed in an oven.

Output Divider

Oven Controller

Description of the controller maintaining the oven temperature at a stable nominal value.

Battery Charger

Explanation of the battery charger's function, determining charge state and current.

Maintenance

Service Information

Regulator PCB Assembly Removal

Oven Removal

Fuse Replacement

AC Line Voltage Change

Acceptance Test

Procedure to verify instrument operation and specifications upon receipt.

Calibration Procedures

Details on calibrating the 732A using direct comparison or standard cells.

Null Verification

Procedure A: Calibrate to Certified 732A

Step-by-step guide to calibrate the 732A using a certified unit as a reference.

Procedure B: Calibration to Standard Cells

Step-by-step guide to calibrate the 732A using standard cells as a reference.

Service and Repair Procedures

Battery Charger Adjustment Procedure

Troubleshooting

Information on troubleshooting the 732A, divided into external symptoms and internal measurements.

External Symptom Troubleshooting

Using external symptoms to isolate problems within the 732A, with required test equipment.

Internal Voltage Measurements

Tests conducted with power applied to identify internal voltage issues and potential corrective actions.

Schematic Diagrams

Interconnect Diagram

LED, Mother Board, and Battery Module PCB Schematics

A3 Pre-Regulator PCB Schematic

A4 Regulator PCB Schematic

A5 Reference PCB Schematic