This manual provides maintenance instructions for the 77 Series III multimeter.
This document is the Service Manual for the Fluke 77 Series III Multimeter, published by Fluke Corporation in November 1998. It provides comprehensive instructions for technicians regarding the safe operation, maintenance, and repair of the instrument. The manual includes specific safety warnings, such as never measuring resistance in a powered circuit and avoiding voltages exceeding 1000V between input jacks and earth ground.
The content is organized into chapters covering the introduction, theory of operation, maintenance procedures, parts lists, and schematic diagrams. Key sections include detailed troubleshooting procedures for various tests like DC voltage, AC voltage, and resistance, as well as specific instructions for checking the crystal oscillator and reference voltage. The manual also provides a list of replaceable parts and schematic diagrams for the A1 Main PCA.
| Safety Standard | IEC Publication 348 |
|---|---|
| Maximum Input Voltage | 1000V dc or ac rms |
| Shock Hazard Voltage | 60V dc or 30V ac rms |
Do not apply more than 1000V dc or ac rms (sine) between any input jack and earth ground.
A high voltage probe should be used if the peak voltage might exceed 1000V.