I am writing some encoder test software and appear to be getting a +0.01 degree error per degree. It cumulates up to 360. I am using a US Digital AD4-8 that outputs hex. Even the out-of-the-box vi that came with the AD4 is giving the same error. I'm stumped. Encoders don't have settings. And I've been all over the documentation and don't see anything I might be missing. Ideas? Thanks in advance.

Had to dig deep into some old code to figure this out. Buried deep, deep in the old code a counts per turn constant is getting set differently than the way I'm doing it. My way is wrong. My value for the constant was wrong. Must have been close in a roundabout way ... that's why the funny offset ... had to dig deep, deep into old documentation to get the correct value.

Motion Control and Motor Drives

encoder error

Solved!

Glad to hear you figured it out!

David S.

Message 11 of 11

(2,701 Views)

Motion Control and Motor Drives

encoder error

Re: encoder error