User name V. Sulkosky
Log entry time 20:00:51 on January26,2008
Entry number 227289
keyword=Cavity UpdateDuring the controlled access, I checked into the problems with the
cavity monitor signals, since John Musson reinstalled the receiver
boards. I saw that the output signal from the monitors was +4.0V,
which was easily saturating the ADCs. Last week, I had adjusted the
op-amps for a +1.5 V signal.
The four channels that only had a pedestal had a positive output from
the op-amps. The upstream X and Y positions signals were slightly
negative, which is why they actually showed a signal. First I
adjusted the op-amps to output a -52 mV signal. After looking at
the ADC from run 3375, I decided to adjust the output to -59 mV to
leave room for larger raster sizes.
Figure 1 and 2 show the ADC signals from the cavity intensity and
positions signals respectively. It will be interesting to see
the effect of the beam now.
FIGURE 1
FIGURE 2
