I'm continuing the arm loss measurements Yuki was making. I'm first familiarizing myself with the procedures for the measurement Johannes describes.

I'm not very familiar with the medm screens, so I'm just kind of poking around and checking with Gautam. I do the following:

1. Turned Xarm ASS dither on, then off.
2. Turned X and Y ALS on, then off shortly after
   1. Realizing I needed some guidance, I found this page on lock acquisition on the wiki
   2. Gautam showed me how to align/lock the IFO so I could take some notes, and we locked the Y arm, misaligned X.
3. I put the PD back in the AS beam path to get the ASDC signal, and approximately centered the beam. This PD is on channel 1 of the scope, which is at 192.168.113.24.
4. I centered the beam onto the MC2 PD that Yuki had installed. This PD is on channel 2 of the scope.
   1. Both scope channels are set to 1V scale (I also had tried 500mV, and it didn't seem to make a difference) and 10s time axis spacing (maximum integration time, since we're looking for a DC effect. Is this what we want?)
   2. The impedance for both channels is 1MOhm.
5. I ran the script to start the loss measurement on the Y arm.
   1. python2 armloss_dcrefl_asdcpd_scope.py 192.168.113.24 1 2 5 YARM
   2. I'm reading ~15 (au?) for the MC channel and ~5% of that out the AS, which seems to make sense to me and looked to be about what Yuki the ratios when I checked the log files. However, I'm a bit confused by the normalization, because the maximum output of the MC PD is 10V, and indeed the scope's display is reading under 10V.

I've left the script running.