WBP Temperature & Humidity Probe Averaging
The FinePointe WBP Controller attempts to correct for drift in the Temperature and Humidity probes by averaging the values of all connected probes during calibration and changing each to match the average value for both Temperature and Humidity.
However, the system will not allow the Humidity to be modified by more than +/- 4% from its actual reading, and the Temperature cannot be modified by more than +/- 1°C.
Examples:
If the four probes read Humidity values of 31%, 32%, 33%, and 34%, the average is 32.5% and all four probe readings will be 32.5% after calibration (applying a 1.5, 0.5, -0.5, and -1.5 offset, respectively).
If, however, the last probe read a value of 50%, the average would be 36.5% and, due to the +/- 4% maximum offset, the probe readings would change to 35%, 36%, 36.5%, and 46% (applying a 4, 4, 3.5, and -4 offset, respectively).
This allows the user to clearly see the potentially inaccurate probe during data collection—the one which is obviously farther from the others—and replace it before recalibrating again.
The same logic is true for the Temperature calibration, but with a maximum offset of +/- 1°C being applied.
Test each Probe Individually
The only way to force the system not to average the probe values during calibration is to only calibrate one site at a time and test each site individually in FinePointe:
- Before calibrating only connect the chamber and transducer on site 1. Disconnect everything from sites 2-4
- Calibrate the system from FinePointe.
- Start a study and only add a subject name to site 1. Do not add names to sites 2-4. Only 1 site should appear when the recording starts.
- The temperature and humidity values will not be averaged and there will be no offset
- Repeat the steps 1-4 above for the remaining sites.
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