PROGRAMMING
4-27
4.6.5
Change Average Type
The user can select either an 8-hour Time Weighted
Average (TWA) or a running Average. The running
average is simply the average of all instantaneous (1-
second) readings since the measurement was started. This
average may increase or decrease with time depending on
the readings. The TWA is a cumulative value used to
estimate the fraction of the 8-hour limit to which the user
has been exposed since the start of the measurement. This
value can only increase or remain constant, never decrease.
Refer to Technical Note 119 for more information on how
TWA is calculated.
1.
“Change Average Type?” is the sixth sub-menu in the
Datalog sub-menu.
2.
Press the
[Y/+]
key to enter the function.
3.
The display will show “ Running Average?” or “ Time
Weighted Average?” depending on the current average
type.
4.
Press
[N/-]
key to toggle between the average types.
Press
[Y/+]
key to select the displayed average type.
5.
If there is any change to the existing setting, the display
shows “Save?” Press
[Y/+]
to save the change. Press
[N/-]
or
[MODE]
to discard the change and return to
the first sub-menu.
