Teledyne GC-Pro/TCD - Gas Chromatograph - Manual (Page 93)

GC-Pro TCD Operation
Teledyne Analytical Instruments 79
your specific application and should not be changed from TCD unless
directed by TAI Customer Service.
4.5.12.8 S ET TCD
With the detector set to TCD, the SET TCD function can be used to
adjust for drift on the TCD detector. It has both a coarse and fine
adjustment and displays the current ADC count received from the
detector.
To make adjustments, press SET TCD from the SETTINGS screen.
The following screen appears:
For proper operation, the ADC value should be in the range of 0 to
+10,000 counts, preferably, it should be as close to zero as possible. The
user can adjust the detector using the coarse and fine adjustment
onscreen sliders. After making an adjustment, allow the ADC value to
settle before making another adjustment. Often, just a coarse adjustment
is adequate, however the value can be fine tuned using the Fine
adjustment slider.
The amount of change associated with a FINE adjustment is often
very slight and depends on the gain value that is set in the TIMING/
PARAMETERS/EDIT screen. See Section 4.5.6.1. The TCD amplifier
in the GC-Pro TCD has 10 settings that control the gain of this
amplifier. Setting a higher gain value will produce a correspondingly
larger change when moving the FINE adjustment slider.