crh 75
OK
Giving the command without parameters starts the 2-point calibration. Remember to allow the
humidity to stabilize for 20 … 40 minutes after changing the reference.
Example: 2-point calibration with LiCl (11 %RH) and NaCL (75 %RH) references:
crh
RH : 11.2684 1. ref ? 11
Press any key when ready ...
RH : 75.0612 2. ref ? 75
OK
6.9.2 Clear adjustment of RH measurement
Use the CRHCLR command to clear the adjustment of RH measurement that has been done
using the CRH command. This command is not available on the HMP110T.
CRHCLR<cr>
Example:
crhclr
OK
6.9.3 Calibrate temperature measurement
Use the CT command to perform a 1-point or 2-point temperature (T) calibration. 1-point
calibration adjusts the oset for the measurement, 2-point calibration adjusts oset and gain.
CT [reference]<cr>
When performing a 1-point calibration, you need to place the probe in a single temperature
reference and wait for 20 … 40 minutes for the temperature to stabilize. To apply the
adjustment, enter the CT command with the reference temperature as a parameter.
Example: 1-point calibration
ct 23.5
OK
Giving the command without parameters starts the 2-point calibration. Remember to allow the
temperature to stabilize for 20 … 40 minutes after changing the reference. The first reference
point must be smaller than the second point, and the dierence between the reference points
must be more than 30 °C. To update the measured value while the command is running, press
enter without inputting a value.
Example: 2-point calibration
Chapter 6 – Serial line communication
47
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