Manual - 8500A Series Peak Power Meter - Giga-tronics

6
Maintenance
6.1 Introduction
This chapter defines maintenance practices and troubleshooting procedures required for fault isolation
down to PC board level.
Problems can occur that might be produced by equipment or components peripheral to the 8501A/8502A
units. Preliminary checks should be made to be sure that a malfunction of external equipment or
components is not causing what appears to be a problem within the instrument.
6.2 Periodic Maintenance
The following maintenance procedures should be performed once each year unless the meter is operated
in an extremely dirty or chemically contaminated environment. More frequent periodic maintenance may
then required.
1. Blow out all accumulated dust and dirt with forced air under moderate pressure. Also, the air
filter for the cooling fan on the rear panel of the PPM should be checked every 3 months for
accumulated dust. A dirty filter can restrict air flow into the unit and cause the instrument to
overheat, which may cause the thermal sensor to shut the instrument off in the middle of a test
routine. If dirty, the filter should be removed and cleaned with a mild detergent and water
solution. Replacement filters can be ordered from the factory.
2. Remove the filter from its holder by snapping the retainer out of the holder. Do not remove the
screws from the filter holder.
3. Inspect the unit for loose wires or damaged components. Check that the PC boards are properly
seated in their receptacles, and that all wire connectors are properly attached to their PC board
pins.
4. The front panel and housing of the unit can be cleaned with a cloth dampened in a mild
detergent. Do not use abrasive cleaners, scouring powders, or any harsh chemicals. Wipe the soap
residue off with a clean, damp cloth, then dry with a clean dry cloth.
5. If calibration is required, refer to Chapter 5 of this manual for procedures.
6. Make a performance verification test in accordance with the procedures in Chapter 5. If the
performance is within the required specifications, no further service is necessary.
Manual No. 20790, Rev C, November 1998 6-1
Superceded by Revision D, March 2009