Fluke 943-227-15 - Manual (Page 27)

943-227-15 Digital Preamplifier
Operator Manual
4-2
4.3 Troubleshooting
WARNING
Extreme care must be used when troubleshooting a
system that has power applied. All standard
troubleshooting precautions apply.
WARNING
Once a problem has been located, remove all power
before continuing with the repair.
CAUTION
Personnel performing the troubleshooting/repair
must be qualified to ANSI 45.2.6, 1978, Skill Level II.
Personnel performing the following procedure must
be familiar with the operation of the monitoring
system and the location of each piece of equipment
used in the system.
If a problem develops, verify that the voltages at connection point inputs and outputs are present and that
all wiring is secure. Refer to Appendix B and C for drawings and parts lists. If a PROM requires
replacement, specify the board revision level when ordering the part.
Troubleshooting / Adjustments
Troubleshooting includes a verification of the LED operation status, the DC voltage levels and the loop
communication loop fuses (Victoreen Loop Communications only).
Specialized test equipment and firmware are required to adjust the auto-zero and PGA subsystems in the
electrometer. If the test equipment and firmware is not available, the unit should be returned to Fluke
Biomedical RMS for re-alignment.