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9
Test Functions and Calibration
Diode Array Detector (DAD)
Dark-Current Test
The dark-current test measures the leakage current from each diode. The test
is used to check for leaking diodes which may cause non-linearity at specific
wavelengths. During the test, the slit assembly moves to the dark position,
cutting off all light falling onto the diode array. Next, the leakage current from
each diode is measured, and displayed graphically (see
Figure 53
on page 176).
The leakage current (represented in counts) for each diode should fall within
the limits (red bands) shown in the plot (see
Figure 53
on page 176).
Dark-Current Test Evaluation
Limit: 0... 12000 counts
Figure 53
Dark-Currrent Test Results (report)
1220 Infinity II LC System User Manual
175
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