Here's a summary of what we found for the eight output channels of VtoF Card #3 (the rightmost one in the crate), with time traces below. The channels are numbered here as they are on the face of the card; that is, 1-indexed.
Channel 1: A very small amount of scatter around a line. The scatter is so small that you can see structure due to the fact that the number of counts in the scaler must be an integer.
Channel 2: Cavity signal, with spikes correlated to cavity on/off changes.
Channel 3-5 (not shown): Identically zero, no scatter. Unplugged at other end?
Channel 6 (shown alone and with Channel 2): Cavity signal, probably quad sum position monitor before cavity entrance.
Channel 7: We believe this is the cavity power signal, probably from the transmission photodiode since it appears to work for both laser polarization states. However, the known cavity power difference (~10%) between right and left polarization states is not reflected here (it's more of a 1% drop). This may be due to photodiode saturation. However, even if we can't quite trust the power measurements at the top of the scale, we *can* use this to determine in real-time whether the cavity is on or off, which is exactly what we need.
Channel 8 (shown full-scale and zoomed-in): Strange structure on a scale
of about 100 MPS, or 3.3 seconds, for the beginning of the run.
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