Bad rotation with Newport PR50PP Platinum rotation controlled by SMC100PP motor controller - is that a communication or a hardware problem?

Hello world

It is a long shot, but I can explain my problem and I hope that someone has seen this problem before.

PROBLEM:

I use a rotation of Newport PR50PP turntable that is controlled by a motorcontroller SMC100PP through LabVIEW. In my experience, I shoot the scene 180 degrees to the right in increments of 36 and then turn to "zero" counterclockwise. This "zero" point must be the same 'zero', I started to leave before the rotation. The problem is that it is off by nearly a whole degree. I need to always start in the same place.

The big problem - computer / Platinum rotation it's originally 'zero '. I record the unit of internal rotation of the scene after each movement and he tells me it's the same 0.00 that began.

Q: is this a problem of communication between LabVIEW and the PR50PP or a mechanical problem?

OTHER NOTES:

  • The change of rotation is repetitive and linear. I repeated more than 15 times and got about the same offset.
  • How I discovered this problem - I have a half plate on the rotation stage and looked between cross polarizers. I recorded the Cos ^ 2 model of intensity of each scan. Each pattern is rotated to the front even if the computer reports that they should be at the same position.
  • I'm under LabVIEW 2011 and by using the controls provided by Newport SMC. They communicate via USB of series.
  • Joined a technical description of the problem that my labmate written upward.

Any idea is appreciated.

~ Liz Cloos

Hello world

After running additional tests, I discovered that it is NOT a problem of LabVIEW. The plate wave inside the rotation of PR50PP plate was a little loose and gave the appearance that the zero is changing. The ribbed plate kept turning slightly after each change of direction.

Thanks for trying to help.

Tags: NI Software

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