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HMP240

User's Guide M210300en

6.3 Calibration of analogue outputs

The analogue outputs have been calibrated at the factory and since they are

very stable, calibration should be performed only when there is reason to

believe that their adjustments have changed.

6.3.1 With serial commands

Disconnect the security lock jumper!

ACAL <cr>

The outputs on channels 1 and 2 are measured and the measured values (mA

or V) entered as calibration coefficients.

Example: both channels have 0...10 V outputs (set with AMODE command);

enter the voltages measured at the analogue outputs:

>ACAL <cr>

Ch1 U1 ( V ) ? 0.123 <cr>

Ch1 U2 ( V ) ? 9.98 <cr>

Ch2 U1 ( V ) ? 0.120 <cr>

Ch2 U2 ( V ) ? 9.98 <cr>

6.3.2 With display / keypad commands

Disconnect the security lock jumper!

• Connect an ammeter/voltmeter to the output of channel 1, select Cali

in the main menu and Analog outputs in the Cali menu. The follow-

ing is displayed (the quantity can be either mA or V):

• Enter the measured lower end current/voltage on channel 1:

• Enter the measured upper end current/voltage on channel 1:

• Connect the meter to the output of channel 2 and enter the measured

lower end current/voltage on channel 2:

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Vaisala HMP243 Betriebsanweisung Seite 56