How to test an NRG Systems #200P vane.
Digital Volt Meter (DVM)
Disconnect the #200P wind vane from the data logger.
Set your digital volt meter to the 200K ohm scale.
Measure resistance between the first and last terminals (skipping the center terminal).
An acceptable reading is approximately 10K ohms nominal (minimum 8K ohms, maximum 12K ohms).
Measure from each outside terminal to the center terminal.
The DVM should display a reading between 0K and 10K ohms (depending on the position of the tail of the vane relative to the body of the vane) in each of these two cases.
If these measurements are done without changing the direction of the vane, adding the two resistance readings together should equal the total resistance from Test 1.
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