This manual covers servicing information for Fluke
multimeter Models 83, 85, and 87 that are marked with CAT
III 1000V on the top case and C € on the bottom case. These
markings indicate that the multimeter complies with IEC-1010
Category III, 1000V fuse rating. This service manual will
prove useful for tasks ranging from routine maintenance to
troubleshooting and repair. Specifications, theory of
operation, calibration routines, testing and troubleshooting
procedures, parts replacement information, and schematic
diagrams are provided.
A meter under warranty will be promptly repaired or replaced
(at Fluke's option) and returned at no charge.
1-2. Organization of the Service Manual
The following descriptions for the various sections serve to
introduce the manual.
Section 1. Introduction and Specifications
This section describes both use of the Service Manual and
application of special terminology (conventions) to describe
the meter's circuitry. A complete set of specifications
appears at the end of this section.
Section 2. Theory of Operation
This section first categorizes instrument circuitry into
functional blocks, with a description of each block's role
in overall operation. A detailed circuit description is then
given for each block. These descriptions explore operation
to the component level and fully support troubleshooting and
repair procedures defined in Section 3.
Section 3. Maintenance
Provides complete maintenance information, from general
maintenance and cleaning instructions to detailed
troubleshooting and repair procedures to the component
level. Troubleshooting and repair procedures rely closely on
both the Theory of Operation presented in Section 2 and the
Schematic Diagrams shown in Section 5.
Section 4. List of Replaceable Parts
Includes parts lists for all standard assemblies.
Information on how and where to order parts is also provided.
Section 5. Schematic Diagrams
Includes schematic diagrams for all assemblies. A list of
mnemonic definitions is also included to aid in identifying
signal name abbreviations.