7.1.5 Atmospheric Pressure Compensation
Some measuring variables depend on the environmental atmospheric pressure
(see 6.2 measuring range list ´w. PC´). As a result, higher deviations from the
normal pressure of 1013mbar can cause corresponding measuring errors:
e.g. error per 100 mbar:
Compensation range:
Rel. humidity psychrometer approx. 2%
500 to 1500 mbar
Mixture ratio, capacitive
approx. 10 %
Vapor pressure VP up to 8 bar
Dynamic pressure
approx. 5%
800 to 1250 mbar (error < 2%)
O2 saturation
approx. 10%
500 to 1500 mbar
Therefore, the atmospheric pressure should be considered (approx.
-11mb/100m over mean sea level, MSL) especially during use in a
corresponding height above sea level. It can either be programmed or
measured with a sensor (see manual 6.7.2). The atmospheric pressure is
indicated in the function ´
mb
´.
Atm. Press:
BAUD
RATE
Key:
F
1
0 1
3
m
b
With each reset the atmospheric pressure is set to 1013mb. It can be set to the
actual value by the usual data entry (see 5.3).
7.2 Single Measuring Point Scan
(see manual 6.5.1.1)
Measuring point scans can be used to acquire, indicate and, in most cases, to
document data from the selected measuring point and also from other
measuring points. Single measuring point scans for acquiring the momentary
measuring values of all active measuring points are triggered by the key
F
in
the function MEAS. VALUE.
Single Meas. Point Scan:
Key:
MEAS. VALUE
F
The measured values are sequentially indicated on the display for approx. 1.5
seconds.(not by continuous measuring point scan) During this process the
arrow ´
START
´ is displayed and then disappears. The time is started if it has
been previously cleared. If a peripheral device is connected (e.g. printer) the
measured values are provided one time as an output via interface and, in
addition, the arrow ´
RS232C
´ is indicated (print output, see manual 6.6.1). The
output format can be set in the function OUTPUT CYCLE (see 7.3.1). If all
measured values also need to be stored, the memory must be activated (see
7.4.1). If this is the case, the arrow ´
MEMORY
´ also appears during the scan.
With each press of the key the measured values are equally processed with
the corresponding measuring time. If true time has to be indicated, it must first
be set (see 7.3.4).
ALMEMO
®
2290-8
33
Single Measuring Point Scan
