Manual Averaging
In this section manual averaging over measured values of the selected channel
will be described. The averaging over measuring point scans can be found in
the manual section 6.7.4.
Averaging over Time
To obtain the average value of all measured values of a measuring channel
over a specified time period, the averaging mode
´StStP´
must be set for the
selected measuring channel. For example, by uniformly scanning an area, this
mode also allows to determine the average flow velocity in a ventilating
channel (see manual 3.5.5). For distinguishing between the manual and the
cyclic averaging the following requirements must be met:
averaging mode of the selected channel
´StStP´
no cyclic measuring point scan (cycles stopped)
no continuous measuring point scan (no
C
in conversion rate)
1. Move rotary switch to the function AVERAGE V.
2. Clear the average value by
the keys
ENTER
,
CLEAR
.
3. Start the averaging with the key
START/STOP
, the
arrow ´AVERAGE´ will be illuminated in the
display.
4. Stop the averaging by operating the same key.
START/STOP
, the arrow ´AVERAGE´ disappears
and the average value can be read.
Averaging over a Number of Single Measurements
For an averaging of isolated measurements at certain points or times (e.g. net
measurements according to VDI/VDE 2640, see manual 3.5.5) the averaging
mode
´SinGL´
must be used. In this case corresponding requirements must
also be met:
averaging mode of the selected channel
´SinGL´
no cyclic measuring point scan (cycles stopped)
no continuous measuring point scan (no
C
in conversion rate)
1. Before each measurement the average value must be cleared in the
function AVERAGE V. by using the keys
ENTER
,
CLEAR
.
2. In the function MEAS. VALUE the single values are captured in the memory
for instant values by pressing the key
START/STOP
. The arrow ´
MEMORY
´
appears in the display.
3. If the value is correct, it can be transferred into the memory for average
values by operating the key
ENTER
. The arrow ´
MEMORY
´ disappears and
the arrow ´AVERAGE´ is now indicated.
1: - - - -
m
/
s
1: 1 2.3 4
m
/
s
30
ALMEMO
®
2290-8
Continuous Measurement of a Measuring Point
