Vaisala HMP240 User Manual
Page 53
HMP240 series
M210300en
User's Guide
51
6.2.1 One point offset calibration
6.2.1.1
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.
•
After giving the correct temperature value (Ref1) and
pressing <cr>, press any key and then <cr>.
6.2.1.2
With display / keypad 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.
•
Select T 1 point cal (or Ta 1 point cal), change the
reading to correspond to the reference and press ENT.
6.2.1.3
With LED 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.
•
After adjusting the offset point and pressing ENT, the sec-
ond LED from left flashes. Press ENT without changing
the output value.