Today we conducted a brief test on the SUS-EX ESD DAC vs the SUS-EX LD32 DAC, both driving the PEM AA chassis at end X per WP11976. This testing was cut short due to relocking attempts. We changed the cable to the PEM output ~1:10pm PST, and replaced the cable back to its original position at ~2:15pm PST. We are still looking at the results of this testing.
F. Clara, R. McCarthy, M. Pirello, D. Sigg
We compared the output of the 20-bit DAC with the LIGO DAC. There is delay of about 90us. More than we would have expected. Decimation filter delay for a ~30kHz cut-off is about 14us. The filters are getting processed and sent to the DAC at a rate of 1MHz. So, maybe ~1-3us processing delay.