[Dsg-halld_plc] possible problem in Hall D PXI channel for

[Brian Eng]

Thanks Mark,

We'll take the PXI offline to run the verification portion of the calibration procedure to see if that ADC is bad, if so we can swap it out with the spare we have.

If not we'll do some more troubleshooting.

Any PXI related alarms can be ignored until we're finished.

> On Mar 12, 2018, at 2:46 PM, Mark Stevens <stevensm at jlab.org> wrote:
> 
> Hi Brian,
> 
> We troubleshot the erroneous magnetometer reading in our controls.  We sent you a copy of the log book entry.  We left a spare (axial) hall probe plugged into the LakeShore meter, and a small bar magnet near it to give us an actual reading to see.  We read a proportional voltage on the output pins of the meter, and the same voltage at the input to the PXI (please see log entry), even proportional in polarity.  The problem must be in the PXI or beyond.  It reads good up to the PXI input.  Please contact Mark Stevens or Scot Spiegel for more information.
> 
> Best Regards,
> 
> Mark Stevens