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Model 9110TH NOx Analyzer Data Acquisition System (DAS) and APICOM
Teledyne Analytical Instruments 179
HOLDOFF also prevents DAS measurements from being made at certain times when the quality of the
analyzer’s O
3
measurements may be suspect (e.g. while the instrument is warming up). In this case, the
length of time that the HOLDOFF feature is active is determined by the value of the internal variable
(VARS), DAS_HOLDOFF.
To set the length of the DAS_HOLDOFF period, go to the SETUP>MORE>VARS menu and at the
DAS_HOLDOFF parameter (see Table 5-3), press the Edit button.