Agilent Technologies 1220 Infinity II LC User Manual

1220 Infinity II LC System User Manual 163
Test Functions and Calibration
9
Variable Wavelength Detector (VWD)
Dark Current Test
VWD Dark Current Test Description
The dark-current test measures the leakage current from the sample and
reference circuits. The test is used to check for defective sample or reference
diodes or ADC circuits which may cause non-linearity or excessive baseline
noise. During the test, the lamp is switched off. Next, the leakage current from
both diodes is measured. The test evaluates the results automatically.
Evaluating the VWD Dark Current Test
Probable causes of test failure
Table 35 Limits
Max. Sample Intensity 790000 counts
Max. Reference Intensity 790000 counts
Table 36 Sample circuit noise exceeds limit:
Cause Corrective action
Defective sample diode Exchange the sample diode.
Defective sample ADC board. Exchange the sample ADC board.
Table 37 Reference circuit noise exceeds limit:
Cause Corrective action
Defective reference diode. Exchange the reference diode.
Defective reference ADC board. Exchange the reference ADC board.

Agilent Technologies 1220 Infinity II LC Specifications

General

Brand	Agilent Technologies
Model	1220 Infinity II LC
Category	Laboratory Equipment
Language	English