Agilent Technologies 7820A Manual page 179

Maintaining Your GC
Hold at temperature for 30 minutes or until the baseline
8
settles at a lower value. The baseline will typically rise, then
fall to a final value lower than the initial baseline.
Restore the analytical method and allow the FID to
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equilibrate.
10 Check the FID output value. It should be lower than the first
reading. If it is not, contact your Agilent service
representative.
Without a column installed, a clean system baseline should
 
be 20 pA.
If the column is not installed in the FID, install it. (See
11
Install a Capillary Column in the FID"
Maintaining the FID
"To
on page 155.)
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