DeltaOHM HD31, Руководство по эксплуатации

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HD31
- 80 -
V1.6
9.6 A
IR SPEED MEASUREMENT AVERAGE
In air speed measurements the detected value can appear to be quite unstable due to air tur-
bulences. In order to limit measurement instability, the use of the average of the last
n instant
measurements (moving average) instead of the instant measurement is preferable.
For instance, the graph below represents the time trend of the air speed instant measurements
acquired by the instrument (curve 1) and the moving average displayed by the instrument in
the case of n=3 (curve 2).
seconds
S
peed (
m
/s
)
Fig. 9.5.1: average effect in air speed measurements
To set the number of instant measurement to be considered in the moving average calcula-
tion:
1. Press SELECT to display the MENU
command in the command bar,
then select the command by press-
ing the
F2 key.
2. Select the SETUP item using
S
and
T
, then press the F3 key
( OK command) to confirm.