Fluke 77 - Manual (Page 28)

Maintenance
Introduction
3
3-3
Warning
These service instructions are for use by qualified
personnel only. To avoid electric shock, do not
perform any servicing other than that contained in
the operator’s manual unless you are qualified to do
so.
3-1. Introduction
This chapter contains maintenance information for the performance testing,
calibration, general maintenance, and troubleshooting of the 77 Series III
Multimeter. For operator maintenance, refer to the Instruction Sheet.
The performance tests are recommended as a preventive maintenance tool to
verify proper instrument operation. A one year calibration cycle is
recommended to maintain the specifications given in the Users Manual. Test
equipment required for the performance tests and calibration is listed in Table
3-1. If the recommended equipment is not available, instruments with
equivalent specifications may be used.
Table 3-1. Recommended Test Equipment
Instrument Type Recommended Model
Multi-Product Calibrator Fluke 5500A
3-2. PCA Access and General Maintenance
Warning
To avoid electrical shock, remove the test leads
before opening the case, and close the case before
operating the meter. To prevent fire, install fuses
with the rating shown on the back of the meter.
Caution
To avoid contaminating the pca with oil from the
fingers, handle it by the edges or wear gloves. PCA
contamination may not cause immediate instrument
failure in controlled environments. Failures typically
show up when contaminated units are operated in
humid areas.
Use the following procedure for removing the pca (printed circuit assembly)
from its case: