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Michael Abbott

Michael Abbott

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TitlePVDescription
Source:DET:SELECT_SNormally the data to each detector should be passed through the FIR, if only to reject the bunch by bunch fill pattern, but it is possible to select the raw ADC data as an alternate source

The detector can be used to select one of the following sources:

SourceDescription
ADCIn this case the ADC data is passed through to the detector.  Typically this doesn't work too well because the fill pattern is inclined to leak through the detector and can interfere with the measurement.
FIRHere the data being used for feedback can also be passed to the detector.  In this case the fill pattern is rejected, but it is difficult to accurately compensate for the phase delay.  In this case we are directly measuring the action of the FIR on the machine.
ADC no fillHere the fill reject filter is applied to the ADC data.
FIR delay:DET:FIR_DELAY_SThis can be set to the group delay of the FIR filter so that this delay is compensated for in the detector.  However, we have discovered at DLS that setting this to anything other than 0 is confusing.
ADC no fill length:ADC:REJECT_COUNT_SThis is a copy of the fill reject length control on the ADC Setup page.
Captured:DET:SAMPLESThis records the number of samples captured in the last sweep.
Underrun:DET:UNDERRUNThis should never indicate anything other than "Ok", an error here indicates a worrying internal FPGA problem, or possibly an unreasonably small bunch count.
Waveforms:DET:FILL_WAVEFORM_SThis is a fudge to help EDM, and should otherwise be set to "Truncated".  This will probably be deleted.

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