Operation
Cooling a Detector
8
Nicolet iS20 User Guide
Thermo Scientific
To verify the laser frequency
1. From the OMNIC software main screen, choose
Collect > Experiment Setup
.
2. Click
Laser Verification
on the Diagnostic tab.
3. As prompted, remove all accessories and samples from the instrument and then click
OK
.
4. Click
Start Verification
.
When the verification is completed, one of the following occurs:
• A message indicates the laser frequency has been verified. Click
OK
to finish.
• The newly measured laser frequency appears below the previously measured
frequency and a message indicates the laser frequency has been optimized. Click
OK
to finish.
Cooling a Detector
If you have an MCT detector, you must cool it with liquid nitrogen before you can collect
data.
Time needed:
40 minutes or less
Tools needed:
• Protective clothing and eye wear
• A small plastic laboratory funnel
• A one-liter, metal vacuum bottle
• Liquid nitrogen
Note
The laser is verified automatically each time you run a Performance
Verification (PV) test. We recommend running a PV te
s
t at least once a month.
Note
• A detector dewar should maintain its insulating vacuum for several years. If the
vacuum leaks, the insulation will lose effectiveness.
