Averaging
11.4.1 S
moothing out meas. val. by means of a sliding averag
e
The first method for averaging applies exclusively to the measured value of the
displayed channel; it is used to smooth measured values of an unstable or
strongly fluctuating nature, e.g. especially turbulent flows, by means of a sliding
average over a specified time frame. The
level of smoothing
can be set in the
Smoothing
function; here you specify the number of measured values to be av-
eraged (possible range 0 to 99). The smoothed measured value then applies for
all subsequent evaluation functions. Smoothing can thus also be used in a com-
bination with averaging over individual measured values (see 11.4.3) or for net-
worked measuring (see 11.4.4).
Measured value smoothing over e.g. 15 values :
Smoothing: 15
When a large number of measuring points is involved, continuous measuring
point scanning should be switched off; the measuring rate might otherwise be
substantially reduced.
Meas. rate: 10 meas. op. / second Cont: -
Time constant
(s) = smoothing / measuring rate · (measuring 1)
is calculated and displayed by the averaging wizard.
11.4.2 Averaging mode
For a detailed description of averaging over measuring point scans see the
Manual 6.7.4.. The averaging method is defined for each channel in the
Aver-
aging mode
function. Below are the methods available, shown with averaging
mode and operation :
Function - No averaging :
Averaging mode: -----
Averaging over individual measuring operations
MANU
or over all measured val-
ues from
START
to
STOP
:
Averaging mode : CONT
Averaging over all measured values in a cycle:
CYCL
Lights up so long as averaging is in progress :
»
Display
of average value in function
Average value: 12.34 m¡
For
recording
average values you will need a
function channel
with range
M(t)
(see 12.3.9/10) or the corresponding
output func-
tion
M(t)
instead of the measured value (see 12.4.5).
11.4.3 Averaging over individual manual measuring
To obtain the average of individual measuring operations at particular locations
or times individual manual measuring point scans E
i
must be performed. At all
measuring points where measured values are to be averaged averaging must
be switched on with ´
CONT
´ mode.
ALMEMO
®
5690-2M
41
M
=
∑
i
m
i
/
N
m1
m15
time window