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User name R. Michaels
Log entry time 15:28:16 on January 4,2013
Entry number 385755
keyword=TDC data in integral modeAt first I was concerned about the width of the TDC on the pulser,
but now I'm not too worried and it seems to be just due to
fluctuations.
First, I calibrated this TDC (fig 1) by introducing a 15 nsec delay.
The width of the timing peak is evident here.
Next (fig 2) I show
upper-left: TDC spectra. RMS = 4.7 nsec. I think the spikes are
due to a 4 nsec resolution of the TDC due to the 250 MHz of the FADC
upper-right: TDC vs pulse height. There is a small positive
correlation here if you zoom. Presumably some sort of time-walk.
lower-left: Illustrates with a snapshot how I find the time over
threshold. I can see the fluctations by looking at many of these
snapshots.
lower-right: time over threshold. The RMS is consistent with the
RMS of the TDC in pulse-integral mode.
Fig 3: A zoom of the time-walk (TDC vs pulse integral).
FIGURE 1
FIGURE 2
FIGURE 3
