Vaisala HMM105 - Manual (Page 20)

Technical Reference _________________________________________________________________
18 ________________________________________________________________ M211638EN-A
Table 30 Adjustment Return Codes
Code Meaning
0 Ok
1 Function not supported
2 Sequence error
3 Recorded-Reference difference too large
4 2-point adjustment: Points too close
Adjusting Measurement
HMM105 can be adjusted while it remains installed in an incubator.
Create the reference environment inside the chamber, and use the Adjust
command to perform the adjustment sequence.
Adjustment can fail for a number of reasons. Refer to the list of return
codes for the Adjust command in Table 30 above.
One Point Adjustment
To perform a one point adjustment of relative humidity (RH) or
temperature (T), you must perform the following sequence:
1. Using the Adjust command, start 1 point adjustment for the
chosen parameter.
2. Place the sensor in the reference environment and wait until the
measurement has stabilized.
3. Using the Adjust command, record the measured point and give
the reference value.
4. Use the Adjust command to end the adjustment.
Two Point Adjustment
To perform a two point adjustment of relative humidity (RH) or
temperature (T), you must perform the following sequence:
1. Using the Adjust command, start 2 point adjustment.
2. Place the sensor in the low end reference and wait until the
measurement has stabilized.
3. Using the Adjust command, record the first measured point and
give the first reference value.
4. Place the sensor in the high end reference and wait until the
measurement has stabilized.
5. Using the Adjust command, record the second measured point and
give the second reference value.
6. Use the Adjust command to end the adjustment.