15 T quadrature encoder with NI 9401

[wyattt]

Hey,

I have a 15 T encoder  with 1024 pulse/rev and I have it hooked to a 9401 daq to measure angular displacement. I was having issues with the signals reaching the threshold value of .8 V for the daq so I ran channels A and B through a bang bang control circuit. Now, the daq reads the signals, but only counts up. I scoped the channels and it looks like the pulses are not 90 degrees out of phase. I removed the channels from the circuit and they are still perfectly in phase. Is there a good way to get labview to add a 90 degree phase delay to only one channel? I'm running a two-channel pulse count with no Z channel.

Thanks a ton,

Wyatt

[wyattt]

Problem solved, but now there is noise from the wind tunnel affecting the encoder signal. They are not wired to the same power source though and I'm sure it isn't vibrations from the wind tunnel because the noise occurs even when I drive the motor at 1Hz.

[wyattt]

Ok, all fixed.