Troubleshooting and Test Functions 4
1100 Series FD Reference Manual 117
Dark-Current Test
The dark-current test measures the PMT signal with maximum and minimum
gain while the lamp is off. It also reads the signal of the reference diode. The
resulting values (two via reference diode and two from PMT) are shown in a
table and checked against reasonable limits (see below).
Dark-Current Test Evaluation
Test Failed
Probable Causes
• Defective PMT.
• Defective reference diode or A/D converter
Suggested Actions
✔ Exchange the PMT.
✔ Exchange the FLF board
Figure 45 Dark-Current Test
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