DAQ Testing/20190628

Raster calibration run: https://logbooks.jlab.org/entry/3696278

Initially wasn't well tuned. Changed to Free Clock Now it is synched so both are synched to the 120 Hz free clock Tsettle Could also change it to have both be -> integer number multiples of 120 and ignore Tsettle Could also do both of these in Beam Synch Mode

Copy from HALOG

The Raster Frequencies before tuning the the Helicity Flip rate had been set to approximately the correct settings, but this was done during the beam sync mode of the control board. Beam sync makes it hard to see the relative phase drift of the raster frequencies w.r.t. the flip rate as the Nth (4th) helicity flip period gets a different integration time in order to allow the following multiplet to latch on the start of beam synch.

The raster settings before changing them were :

• Channel 1 (yellow on the Agilent) - 25.07478380 kHz
• Channel 2 (green on the Agilent) - 24.95511650 kHz

I think that channel 1 corresponds to the Y and 2 to the X raster currents (as these are the labels of their cables through patch panel land), but what X and Y mean in terms of the effect we see on the spread of the raster in the Counting Mode DAQs is still a matter of opinion on coordinate frame nomenclature choice (see raster current in Counting Mode DAQ calibration studies from Catherine:https://logbooks.jlab.org/entry/3695377)

I updated the raster synch during a free clock 120 Hz test. Set helbrd top 120 Hz (with 100us Tsettle, Tstable to 8233.35us)

Raster Frequency Synching

We want to set both frequencies to an integer multiple of 120 Hz and have their difference be 8x120 = 960 (previous experience says this may be optimal) 25kHz/120 = 208.33, so 24,960 is the sweet spot multiple of 120 I pick 25440 and 24480

New Settings taken during 100 us Tsettle and 8233.35 us Tstable

• Channel 1 (yellow) 25.439949 kHz
• Channel 2 (green) 24.479949 kHz