12. Function menus
37
Interface commands:
response:
store a measurement value:
S-4
output of data storage:
P-04
Memory:
P01: 00: +022.12 °C
P02: 00: +022.12 °C
P03: 10: +0039.9 %H
P04: 10: +0039.9 %H
P05: 20: +0007.6 °C
Clearing the memory:
C-04
12.2
Averaging
The
average value
for a measured value is needed for various applications
e.g. smoothing a widely fluctuating measured value (wind, pressure etc.).
Average flow velocity in a ventilation channel
Hourly or daily average values for weather data (temperature, wind, etc.)
Also for consumption values (electric current, water, gas, etc.)
M
̅ = (∑
i
M
i
) N
⁄
The average value
M
̅
for a measured var-
iable is obtained by totaling a whole series of measured
values Mi and then dividing by the number of measured
values N.
If, in function selection, averaging is selected a new selection menu will appear
listing the various averaging modes.
These include measured value smoothing for the
selected channel with a sliding averaging window,
averaging over individual measuring operations
selected by place or time, averaging over time,
over cycles, or over specified measuring points.
For flow sensors a special menu for array meas-
uring as per VDE is provided.
To select the averaging menu press key(s) :
and
or
PROG
To clear averaging for the selected channel press : <CLR>
12.2.1
Smoothing meas values by means of a sliding av-
erage
The first method for averaging applies exclusively
to the measured value of the selected channel; it
is used to smooth measured values of an unstable
or strongly fluctuating nature, e.g. especially tur-
bulent 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 averaged (possible range 0 to 99). The
smoothed measured value can thus also be used in all subsequent evaluation
functions in combination with averaging over individual measured values (see
