Operation
Averaging Time
Thermo Electron Corporation
Model 42
i
Low Source Instruction Manual
3-17
Custom Ranges
The Custom Ranges screen is used to define the custom ranges.
The display shows the current custom range. The next line of the display is
used to set the range. To use the custom full-scale range, be sure to select it
(Custom range 1, 2, or 3) in the NO, NO
2
, or NO
x
Range screen. For
more information about selecting ranges, see “NO, NO
2
, and NO
x
Ranges”
above.
•
In the Main Menu, choose Range > Set Custom Ranges >
Custom
range 1, 2,
or
3
.
•
Use
and
to increment or decrement the numeric value.
•
Press
to save the new range.
Averaging Time
The averaging time defines a time period (10 to 300 seconds) over which
NO, NO
2
, and NO
x
measurements are averaged. The average
concentration of the NO, NO
2
, and NO
x
readings are calculated for that
time period. The front panel display and analog outputs are updated every
10 seconds with the calculated averages. An averaging time of 10 seconds,
for example, means that the average concentration of the last 10 seconds
will be output at each update. An averaging time of 300 seconds means that
the moving average concentration of the last 300 seconds will be output at
each 10-second update. Therefore, the lower the averaging time, the faster
the front panel display and analog outputs respond to concentration
changes. Longer averaging times are typically used to smooth output data.
The Averaging Time screen for the single range mode is shown below. In the
dual and auto range modes, an averaging time menu is displayed before the
averaging time screen. This additional menu is needed because dual and
auto range modes have two averaging times (high and low). The averaging
time screens function the same way in the single, dual and auto range
modes. The following averaging times are available: 10, 20, 30, 60, 90, 120,
180, 240, and 300 seconds. Additional averaging times are available in
CUSTOM RANGE 1:
CURRENTLY: 255.6
SET TO: 000255.7 ?
§¨
MOVE CURSOR
©ª
CHANGE VALUE
SAVE
RANGE AVG DIAGS ALARM
Summary of Contents for 42i
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