Vaisala PTB220 User Manual download pdf (Page 94)

USER'S GUIDE_______________________________________________________________________

88 ___________________________________________________________________ M210194EN-A

Examples of setting the pressure limits:

>ascl<cr>

P Low : 500 ? 800 (0V/4mA = 800 hPa)

P High : 1100 ? 1100 (5V/20mA = 1100 hPa)

ITEST x.xx <cr>

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<cr>

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<cr>

993.9170530

DLCI n<cr>

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.

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Vaisala PTB220 User Manual Page 94