Noise filtering - NI 9361

[gaet.m]

Hello everybody,

I'm using a NI 9361 module to measure the rotation speed of a shaft that is rotating thanks to an electric motor.

I'm facing big noises due to this electric motor; when I launch it, my counter directly measures frequencies up to 1 MHz, even when my shaft is not rotating. I can the see the same phenomena when I'm looking at the edge counting results...

I tried to use the pulse width filter inside my Labview application to filter the signal but I could not find nothing sufficient.

Has anyone ever face this kind of issue, and if so, is there a solution to face it ?

Thank's very much.

[Niki']

Hi gaet.m,

Could yo give us more information about your issue ? What is the amplitude of the noise? How far away from the motor is your NI 9361 and how big is the motor? Do you use it with a CompactRIO or a cDAQ ? Do you have any screenshot of your issue ?

Regards.

[coryjfowler · Accepted solution]

Are you using a shielded connection to the sensor?  You might also try raising the signal threshold level on the 9361 if you are doing RSE.

[limin1972]

hello，please tell me how to solve the problem，thanks