Maintenance
Introduction
3
3-3
WWarning
Service procedures described in Chapter 3 should be
performed by qualified personnel only. To avoid electric shock,
perform only those procedures described in this service
manual.
3-1. Introduction
Chapter 3 contains maintenance information for the Fluke 78 meter and includes
performance tests, calibration, general maintenance procedures, and troubleshooting. For
operator maintenance, refer to the Fluke 78 Users Manual.
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.
3-2. Recommended Equipment
Test equipment recommended 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.
3-3. Operator Maintenance
WWarning
To avoid electrical shock, remove the test leads before opening
the case, and close the case before operating the meter. To
prevent fire, install fuse with the rating shown on the back of
the meter.
Caution
To avoid contamination with oil from the fingers, handle the
pca 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.
3-4. Case Disassembly
Use the following procedure to disassemble the case:
1. Set the rotary switch to OFF and disconnect the test leads if they are installed.
2. Remove the four Phillips screws from the case bottom.
3. Turn the meter face up, grasp the case top, and pull the case top from the meter.
3-5. Battery Replacement
WWarning
To avoid false readings, which could lead to possible electric
shock or personal injury, replace the battery as soon as the
battery indicator (N) appears.
The meter is powered by a single 9 V battery (NEDA 1604, 6F22, or 006P). Refer to
Figure 3-1, and use the following procedure to replace the battery:
1. Remove the upper case as described under Case Disassembly.
2. Lift the battery from the case bottom and install the new battery.
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