Originally Posted by
cngbrick
leeko,
With a voltmeter you can check if the handwheel is generating the right signals. The handwheel will produce a sequence of pulses on terminals 3 and 5 as you rotate the wheel. Use the following procedure to verify operation:
1) Set your voltmeter to read signals of at least 5 volts
2) Terminal 2 will be the ground reference for all the readings (black probe here)
3) Check voltage on terminals 3 and 5 and note down
4) Move the handwheel one click and repeate and note voltages as in step 3.
5) Repeat (4) until you have read the voltages for 4 positions of the hand wheel.
What you are looking for in a properly working hand wheel is a sequence of voltage changes where exclusively one terminal changes voltage on each click.
This means for instance that the outputs would do the following:
(T3,T5)
(lo, lo) - click 1
(lo, hi) - click 2
(hi, hi) - click 3
(hi, lo) - click 4
hi would be a voltage close to 5V, lo would be close to 0V.
One and only one terminal changes state for each click.
RT