If you use the Insight PC software to adjust the measurement or to
restore the factory settings, always return the physical trimmer to the middle
position before starting. When you make an adjustment with Insight, the
position in which the trimmer is at that point is set as the ±0 point.
CAUTION!
7.2.1 1-Point Adjustment Using Trimmers and Reference
Calibrator
• Reference environment(s) for producing the desired humidity and/or
temperature (for example, Vaisala HMK15 Humidity Calibrator).
• A multimeter for checking the analog output reading (connect in series to
measure the current output).
• Small Phillips head screwdriver for turning the trimmers.
To adjust the output:
1. Prepare the reference (for example, a humidity calibrator). Use a reference that matches
your normal measurement environment as closely as possible.
2. Connect the multimeter to the analog output (connect in series to measure the current
output).
3. Insert the probe head in the reference environment.
4. Wait for the reference measurement to stabilize fully. This may take more than 30
minutes. Monitor the readings to see when the measurement has stabilized.
5. When the measurement has stabilized, adjust the output with the trimmers until it
matches the known value of the reference.
Note that there is a small delay before the output value updates after you
turn the trimmer.
7.2.2 Adjusting Output Using Trimmers and Reference
Transmitter (1-point adjustment)
• A recently calibrated reference device (for example, a second HMD60
transmitter).
• A multimeter for checking the analog output reading (connect in series to
measure the current output).
• Small Phillips head screwdriver for turning the trimmers.
Chapter 7 – Calibration and Adjustment
35
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