Vaisala PTB220 - Manual (Page 94)

U SER ' S G UIDE _______________________________________________________________________
88 ___________________________________________________________________ M210194 EN -A
Examples of setting the pressure limits:
>ascl
P Low : 500 ? 800
(0V/4mA = 800 hPa)
P High : 1100 ? 1100
(5V/20mA = 1100 hPa)
>
ITEST x.xx
where:
x = current or voltage value to be checked
The operation of the analog output can be tested by forcing the output
to given values, which can be measured with a current/voltage meter
from the analog output. The output signal is locked during the time
ITEST is performed, and is not affected by pressure changes. Plain
command ITEST returns the barometer to show pressure.
Examples of using ITEST:
>itest 3
3.0000000 0.6000000 32295
>
where:
3.0000000 = output value
0.6000000 = ratio of output value and full range
32295 = input value of D/A converter (range 0-65535)
>itest
993.9170530
>
DLCI n
where:
n = number of the pressure transducers (1, 2 or 3)
The DLCI command is used to give offset/gain corrections to the
analog output.
The analog output has been calibrated at the factory and since it is
very stable, the adjustment should be performed only when there is a
strong reason to believe that it has changed.
NOTE For the adjustment, use an accurate and calibrated current/voltage
meter only.