Vaisala HMP243 Betriebsanweisung PDF herunterladen (Seite 54)

HMP240

User's Guide M210300en

6.2.2 Two point temperature calibration

6.2.2.1 With serial commands

• Leave the reference instrument and the transmitter for at

least 4 hours in the same space so that their temperatures

have time to equalize. Remove the filter cap prior to

calibration.

Disconnect the security lock jumper!

• Check the transmitter against the reference.

• For the humidity sensor head: give command CT <cr>,

enter the first point value and press <cr>:

>CT <cr>

T : xx.x Ref1 ? yy.y <cr>

Press any key when ready

• If you want to see how the sensor stabilizes to the refer-

ence temperature, enter c <cr> instead of the first refer-

ence:

T : 0.90 Ref1 ? c <cr>

T : 0.55 Ref1 ? c <cr>

T : 0.55 Ref1 ? 0.0 <cr>

Press any key when ready...

• For the additional temperature sensor head: give command

CTA <cr>, enter the first point value and press <cr>:

>CTA<cr>

Ta: -20.07 Ref1 ? -20.08

Press any key when ready...

• Change the temperature and check the transmitter again

against the reference.

• Check that the reading corresponds to the reading of the

reference instrument. If not, adjust the second point.

• Press any key, enter the second point value and press <cr>.

T (or Ta) : xx.x Ref2 ? yy.y <cr>

• The stabilization of the sensor can be monitored by

entering c <cr> instead of the reference value.

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Vaisala HMP243 Betriebsanweisung Seite 54