CHAPTER 6______________________________________________ CALIBRATION AND ADJUSTMENT
VAISALA _________________________________________________________________________ 55
CHAPTER 6 CALIBRATION AND
ADJUSTMENT
The DMP248 transmitter is fully calibrated and adjusted as shipped
from factory. The recommended humidity calibration interval is one
year.
A hand-held dewpoint meter DM70 can be used in field-checking of
the DMP248.
The adjustments of the temperature measurement channel and the
analogue outputs are particularly stable and in normal circumstances,
there is no need to recalibrate them.
NOTE
To achieve the best accuracy in low dewpoints, the DMP248 shall be
sent once a year to Vaisala Service Centers for dewpoint calibration
and adjustment.
Humidity calibration and adjustment
The DMP248 transmitter is calibrated against two accurate RH
references. The calibration can be performed by the end-user, or the
instrument can be sent to Vaisala (see page 71) or a Vaisala
representative. A two-point calibration and adjustment can be
performed with Vaisala’s HMK15 Calibrator.
Calibration can be performed by giving the commands using the press
switches inside the housing, through the serial bus (serial commands)
or through the menus on the local display (display/keypad
commands).
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