Calibration
Zero/Span Schedule
Thermo Scientific
42iQTL Instruction Manual
4-27
a zero and/or span. This gives the instrument time to flush out the zero and
span gas before any meaningful sample data is taken. Logged data is flagged
as taken during a purge to show that the data is suspect. Durations between
0 and 99 minutes are acceptable. Each time a zero/span schedule occurs the
zero is done first, followed by the span. To perform just a zero, set the span
duration to 0 (off). The same applies to perform just a span.
The Schedule Averaging Time button allows the user to adjust the schedule
averaging time. The schedule averaging time is used by the analyzer only
when performing a zero/span schedule. The analyzer’s averaging time is
used for all other functions. Range is 1
300 seconds.
Background Calibration and Span Calibration are toggle buttons that
change between enabled or disabled.
If the background calibration is set to enabled, then a zero adjustment is
made. If the span calibration is set to enabled, then a span adjustment is
made. (This is how to set up a scheduled, recurring auto calibration.)
The Zero/Span Ratio button is used to set the ratio of zero checks or
adjustments to span checks or adjustments. For example, if this value is set
to 1, a span duration will follow every zero duration. If this value is set to 3,
there will be two zero checks between each span check. This value may be
set from 1 to 99, with 1 as default.
Schedule Averaging
Time
Background
Calibration and
Span Calibration
Zero/Span Ratio
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