Vaisala DMP248 Service Manual download pdf (Page 69)

CHAPTER 6_______________________________________________________________ CALIBRATION

VAISALA _________________________________________________________________________ 63

• Check that the reading corresponds with the reading of the

reference instrument. If not, adjust the second point.

• If necessary, adjust with the arrow switches to the correct value

and press ENT. At the second calibration point the second LED

from the left flashes.

Calibration of the analogue outputs

The analogue outputs have been calibrated at the factory and since

they are very stable, calibration of the outputs should be performed

only when there is reason to believe that their adjustments have

changed.

Using 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>

Using display/keypad commands

Disconnect the security lock jumper!

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

&DOL in the main menu and $QDORJ RXWSXWV in the Cali menu. The

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

1 2 ... 64 65 66 67 68 69 70 71 72 73 74 ... 144 145

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Vaisala DMP248 Service Manual Page 69