Thermo Scientific 49i Instruction Manual page 62

Operation
Calibration Menu
Zero/Span Averaging Time
Zero/Span Ratio
3-26 Model 49i Instruction Manual
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: 10, 20, 30, 60, 90, 120, 180, 240, and 300
seconds. Additional averaging times are available when the instrument is in
fast cycle time. These averaging times include 4, 8, 12, 24, 36, 48, 72, 96,
and 120 seconds. For more information about fast update times, see "Cycle
Time", later in this chapter.
• In the Main Menu, choose Calibration > Zero/Span Check > Zero/Span
Avg Sec.
• Use and
• Press to save the averaging time.
ZERO/SPAN AVERAGING TIME:
CURRENTLY:
SET TO:
RANGE AVG
The Zero/Span Ratio screen is used to adjust the ratio of zeros to spans. For
example, if this value is set to 1, a span check will follow every zero check. If
this value is set to 3, there will be two zero checks between each zero/span
check. This value may be set from 1 to 10, with 1 as default.
• In the Main Menu, choose Calibration > Zero/Span Check > Zero/Span
Ratio.
• Use and
• Press to save the ratio value.
to scroll through a list of choices.
60 SEC
90 SEC ?
CHANGE VALUE
SAVE VALUE
DIAGS ALARM
to increment and decrement the numeric value.
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