Campbell Scientific RDP500 Remote Data Platform - Manual (Page 20)

RDP500 Remote Data Platform
7. You must first tare the gauge by selecting “Tare Gauge” under “Step 1”.
This will zero out the rain gauge and result in a “Precip_in” value within
+/- 0.001” of 0. If the desired results are not achieved, ensure the catch
basin is properly mounted and that the rain gauge is level then repeat the
steps listed above to re-tare the rain gauge.
8. When the tare is complete, “Step 1” will show “Complete” and “Step 2”
will show “Ready” (almost instantaneously after selecting “Tare Gauge”).
9. Once “Step 2” shows “Ready”, the calibration weights should be carefully
placed in the center of the catch basin. For best results, the weights should
be between 8,000 and 20,000 grams. Maximum capacity is 20,000 grams.
10. Select the appropriate weight, in grams, from the pick list under “Step 2”.
11. “Step 2” will then show “In Progress” for approximately 5 minutes and
then show “Complete”.
12. Once complete, the gauge has been calibrated to measure Precip_in within
+/- 0.005” of the water inch equivalent of the calibration weight and hold
steady. The resolution of the load cell is better than 0.0005” and will
respond to slight changes in the applied load due to extraneous forces
(wind, vibrations or out of level shifts). You may now remove the cal
weights.
13. The RDP500 has a built-in calibration data table (Cal Results) where the
calibration results will be stored at the end of a calibration procedure. The
failure or success of the calibration will be noted in the Cal Results table.
The entire standard table lists the TS, RN, Success, Mult, Offset, Weight,
Post Cal Measured Weight, Cal Weight used.
FIGURE 4-4. The Cal Results table displayed on a CR1000KD.
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