Jenne, Chris Whittle

I verified that the ITM oplevs will most likely be insufficient for taking charge measurements; we will need to rely on DARM. See the attached spectra, made with an excitation at various frequencies and amplitude 130k cts. Dotted reference lines were set with no excitations, solid lines show the response to the excitation in the bottom axes.

I also noticed that some of the MEDM outputs for L3 of the ITMs are incorrect. Two of the USER MODEL DAC OUTPUT (H1:FEC-30_DAC_OUTPUT_3_6, H1:FEC-30_DAC_OUTPUT_3_7) read 0 when a voltage should be present. The ANALOG SWITCH lights and quadrant VMON channels are left-right flipped relative to the control switches (i.e. flipping UL shows a reading in UR). I also had to remind myself that I should always use the longitudinal channel (rather than pitch or yaw, which will attempt a differential excitation and give zero output) when exciting ITMs.