Vaisala HMP110REF

Chapter 5 _______________________________________________________________ Maintenance
VAISALA ________________________________________________________________________ 61
8. Use the ERRS command to see that no errors are active:
errs
9. Use the SEND command to verify the currently measured RH
value:
send
T= 22.9 'C RH= 11.1 %RH Td= -8.0 'C
10. Give the CRH command with the RH value of the humidity
reference as a parameter:
crh 11
OK
11. After entering the correction, unplug the USB cable from the probe.
Insert the probe in the NaCl salt chamber (75 %RH) and wait for
20 – 40 minutes for humidity and temperature to stabilize.
12. Connect the USB cable to the probe and use the SEND command
to see the currently measured value.
13. Give the CRH command with the RH value of the humidity
reference as a parameter:
crh 75
OK
14. Check with the L command that the user adjustment parameters
have changed.
If you wish to remove the effects of RH calibration (returning the
RH measurement of the probe to the factory calibrated state), see
section Clear Adjustment of RH Measurement on page 49.
One-Point Adjustment of T Measurement
(HMP110, HMP113, and HMP110T)
To perform a one-point adjustment to the temperature measurement of
the HMP110, HMP113, or HMP110T using serial line, you need:
- The Vaisala USB cable (Vaisala order code: 219690)
- PC with a terminal application.
- One known and stable temperature reference.
1. Connect the USB cable to the PC, but do not connect it to the probe
yet.
2. Remove the filter from the probe and insert the probe in the
temperature reference.