Hi Peter, I've included some plots which you might find interesting. With the 25 MHz external clock connected, I recorded runs at various duty cycles; I hoped to find a duty cycle where the artifical time structures disappeared. The plot which is shown for each duty cycle is gondola 1: IU-OU times. Notice that I was never able to eliminate the artifical time structures entirely, even in the vicinity of 50%. This is cause for concern. > Claude told me yesterday, that FAST is planning major running > this summer. Tom, please ask Claude, to connect you to the > FAST daq experts, they must have had similar troubles or > at least should be interested. Also you could check how > they shaped their clock signals. I was in communication with the FAST people during run6, but when I sent them an e-mail in January (about the CAENs) I did not receive a reply. I may have worn out my welcome. But perhaps I should just try again. I will also send an e-mail to the CAEN people about my latest findings, and see if they have anything to offer. At this point, I don't know what else to do about the CAENs. Do you have any advice? Tom
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25Mhz_timestruct.ps
Description: time structures