TB4 and TB4MM Tipping Bucket Rain Gages
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Field calibration check:
1.
Remove the housing assembly from the base by removing the three
screws and lifting upward on the housing.
2.
Check the bubble level to verify the rain gage is level.
3.
Pour water through the inner funnel to wet the two bucket surfaces. Using
a graduated cylinder, slowly pour 314 cc (19.16 in
3
) of water, over a 15-
minute period, into the collection funnel. This volume of water is equal to
.39 inches of rainfall (10 mm).
4.
After the water has passed through the rain gage, the tipping bucket
should have tipped 39 times for the TB4 or 50 times for the TB4MM.
5.
If the rain gage fails to record the correct number of tips, return the unit to
Campbell Scientific for recalibration.
8.3.1 Factory Calibration
If factory calibration is required, contact Campbell Scientific to obtain an RMA
(see
