Operation
Calibration Menu
3-28 Model 42i Low Source Instruction Manual Thermo Electron Corporation
Zero/Span/Purge Duration
Minutes
The Zero Duration Minutes screen defines how long zero air is sampled by
the instrument. The span and purge duration screens look and function the
same way as the zero duration screen, and are used to set how long the span
gas and sample gas are sampled by the instrument. Durations between 0 and
60 minutes are acceptable. Each time a zero/span check occurs the zero
check is done first, followed by the span check. To perform just a zero check,
set the span and purge duration screen to 0 (off). The same applies to
perform just a span or purge check.
• In the Main Menu, choose Calibration > Zero/Span Check > Zero,
Span or Purge Duration Min.
• Use and to increment and decrement the numeric value.
•Press to save the duration value.
Zero/Span Averaging Time The Zero/Span Averaging Time screen allows the user to adjust the
zero/span averaging time. The zero/span averaging time is used by the
analyzer only when performing an automatic zero or span check. The
analyzer’s averaging time is used for all other functions. The following
averaging times are available: 1, 2, 5, 10, 20, 30, 60, 90, 120, 180, 240, and
300 seconds.
• In the Main Menu, choose Calibration > Zero/Span Check > Zero/Span
Avg Sec.
• Use and to scroll through a list of choices.
• Press to save the averaging time.
ZERO DURATION:
CURRENTLY: 30 MIN
SET TO: 31 MIN ?
§¨
MOVE CURSOR
©ª
CHANGE VALUE
SAVE
RANGE AVG DIAGS ALARM
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