Vaisala DMP248 Service Manual Page 67

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CHAPTER 6_______________________________________________________________ CALIBRATION
VAISALA _________________________________________________________________________ 61
Connect an ammeter/voltmeter to the analogue outputs (connector
X2). Give command l. At the first calibration point the
LED on the left flashes; adjust the first point (offset) with the
arrow switches to the same reading with the reference and press
ENT switch.
After adjusting the offset point and pressing ENT the second LED
from left flashes. Press ENT without changing the output value.
Two-point temperature calibration
Using 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
before turning the transmitter on!
Check the transmitter against the reference.
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 reference
temperature, enter c <cr> instead of the first reference:
T : 0.90 Ref1 ? c <cr>
T : 0.55 Ref1 ? c <cr>
T : 0.55 Ref1 ? 0.0 <cr>
Press any key when ready...
Change the temperature and again check the transmitter against
the reference.
Check that the reading corresponds with the reading of the
reference instrument. If not, adjust the second point.
Press any key, enter the second point value and press <cr>.
T : xx.x Ref2 ? yy.y <cr>
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