User's Guide _______________________________________________________________________
186 __________________________________________________________________ M211107EN-C
PWD32 Calibration Procedure
If calibrating is needed according to the calibration check, follow the
instructions below (see section PWD32 Calibration Check Procedure on
page 184).
1. Give the following command:
CAL [calibrator signal value]
for example: CAL 485
The calibrator signal value is printed on the labels of the glass
plates. Typically the signal is close to 500. PWD32 calculates a
new scaling factor and stores it in the non-volatile memory
(EEPROM).
2. Type CHEC to verify that the new scaling factor is in use. The
displayed signal value should be equal to the calibrator signal
value. If the difference between the new scaling factor and the
factory calibrated one is more than 20%, the CAL command will be
ignored. Check PWD32 and the calibrator for hardware or
mechanical errors. Also consult Vaisala.
3. If the optical units PWC12 or PWT11 have been replaced, the new
scaling factor might change more than 20% from the original
scaling factor, value and the CAL command is ignored. In this case
use the FCAL command (factory calibration) instead of CAL
during the calibration procedure.
PWD32 RAINCAP® Calibration
The RAINCAP of PWD32 is calibrated as described under section DRY
ON and WET on page 123.
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