Troubleshooting
6850
6850
Released: April 2004 6850 Series Gas Chromatograph Service Procedures 310
Any peak this wide or greater should use a Chem-
Station sampling rate of 5 Hz. Any faster
sampling adds no useful information to the peak
data. Faster peaks, like the Operational Qualifi-
cation unretained, fast solvent peak
(0.01 minutes wide), could benefit from 10 Hz
data rate, but never 20.
Theoretically, system precision will start to
suffer with peaks under 0.02 minutes wide
mainly due to the hardware switching rate,
regardless of sampling rate. The splitless, FID
checkout sample peaks (C14,15,16) exhibit
worse ringing on the tail because of column over-
load which causes a fast return to baseline,
hence a higher frequency component to the
signal.
NOTE: TCD noise should never be evaluated at a
ChemStation data rate > 10 Hz.
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