7.1.4 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, cap.
approx. 10% vapour pressure VP up to 8 bar
Dynamic pressure
approx. 5%
800 to 1250 mbar (error < 2%)
O
2
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).
Function
ATM. PRESS.
(
mb
)
BAUD RATE
Key:
Programming
Input mbar see 5.3
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.
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
MANUAL
.
Single Meas. Point Scan:
Key:
ALL
MANUAL
The measured values are sequentially indicated on the display for approx. 1.5
seconds. 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 the arrow ´
RS232C
´ is indicated (print output, see
manual 6.6.1). The output format can be set in the function OUTP. 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).
FUNCTION
30
ALMEMO
3290-8
Single Measuring Point Scan
Summary of Contents for ALMEMO 3290-8 V5
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