Slit Test - Agilent Technologies 1220 Infinity II LC User Manual

9
Test Functions and Calibration
Diode Array Detector (DAD)

Slit Test

The slit test verifies correct operation of the micromechanical slit. During the
test, the slit is moved through all slit positions while the detector monitors the
lamp intensity change. When the slit position is changed, the intensity drop
(move to smaller slit) or intensity increase (move to larger slit) must be within
a defined range. If the intensity changes are outside the expected range, the
test fails.
Slit Test Evaluation
Limit: 0.7 - 1.3 (for standard flow cell)
Test Failed
Probable cause
1
2
3
4
5
174
Flow cell still installed.
Old or non-Agilent lamp.
Defective slit assembly (stray light).
Defective detector main board.
Defective PDA/optical unit.
Suggested actions
Remove the flow cell.
Run the "Intensity Test" on page 177.
Exchange the lamp if old or defective.
Exchange the slit assembly.
Exchange the detector main board.
Exchange the optical unit.
1220 Infinity II LC System User Manual