User name Reitz
Log entry time 18:00:06 on July20,2001
Entry number 66898
keyword=SpecR_S1_TDC_L1Strange TDC histograms were due to the programmable width
fan out. The first channel was "bad" again, this time the signal
was there , but was approx 200ns delayed compared to other
channels.
This only effects the TDC-offset. For forming the trigger, another
fanout is used.
Replaced the module with a spare one, but noticed, that there
channel 14 and 15 were both damaged.
So I replaced it completly, used the Lecroy Delay output directly,
but therefore had to increase the width of the signals at the
discriminator back to 110 ns.
With cosmics spectra look fine.
FIGURE 1
