The Xend Pcal module has some issues.

Today Sudarshan and Travis made some adjustments that seem to have eliminated the clipping (aLog from Sudarshan forthcoming).

But while setting the Pcal excitations today we noticed that we don't have a readback of the AOM excitation.  It may be a cabling issue.

More relevant is that the power seems to be significantly lower than expected, about 30%.

We left the laser operating and illuminating the ETM, but without excitations.  This will allow us to diagnose if the clipping issue is resolved.

When time allows, we will go to Xend and investigate further. 

All of the necessary calibration lines can be generated from one Pcal module; they are currently running at Yend.

Eventually, we plan to use the Xend Pcal for a single high frequency line near 3 kHz, and as a spare in case we have issues with the Yend module.