I measured the noise floopr of the HAM-6 CPS. This is in the configuration that seemed best at LLO, a ground from the electronics rack and a local ground.

The gold colored line is twice our noise model which is what we were getting at LLO.  I have been using two different targets which are at +/-4Volts and since the noise goes as the square of the

distance we would expect the noise from the channels using the different targets to be  (1+0.4)^2 and (1 -0.4)^2  (there is a 1mm offest) which is more or less what we are seeing at high frequencies. 

At low frequencies (were we use then in the control) it is clearly steepper then the noise model

 there is also a noise spike at 0.5Hz in H2 and V2, I chased this a bit last night and found

  - It doesn't look like it is coming from the CPS electronics, I turned of the power to the CPS (unplugging the calbe in the electronics room) and it was still there

 - when I shorted out the inputs to the HAM SEI interface on channels #1 and 2 it popped up in channel H3 and V3 

 - as far as I can tell it has always been at exactly 0.5Hz