1-Point Adjustment Using Trimmers and Reference Calibrator - HMD60 - HMD65

HMD65 User Guide

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  • 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.