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| == Introduction == Herschel/PACS FM-IST measurements at the He-II cryo stage have been carried out between 24th and 28th August 2008. These comprised SFT, SPT, EMC test, FFT. During the analysis of the data obtained during these measurements, the timekey of the diagnostic HK data turned out to be unreliable. Here, I summarise some the most important issues of this finding. == Data Analysis == For the check of the synchronisation of the PACS chopper trigger with the SPEC detector readout, we used a diagnostic HK sampling frequency of 256 Hz and 1000 Hz. I selected measurement with the lower frequency for this summary. The TM file is ''FIST_SPT_Spec707a_choppDetecSync_redundant_20080828_03.tm''. Furthermore, the Chopper SFT carried in open loop is used during this investigation. The referring TM file is ''FIST_SFTHeII_Chopper_002_20080824.tm''. I also investigate the impact on the timekeys of the two PCSS HK import classes ''getRawMeasures'' and ''ValuesExtractor.getDiagnosticValues''. Finally and as a comparison, I investigated the timekeys extracted from the data DECMEC header. = Attachments = |
Analysis of PCSS Timing Handling
Introduction
Herschel/PACS FM-IST measurements at the He-II cryo stage have been carried out between 24th and 28th August 2008. These comprised SFT, SPT, EMC test, FFT. During the analysis of the data obtained during these measurements, the timekey of the diagnostic HK data turned out to be unreliable. Here, I summarise some the most important issues of this finding.
Data Analysis
For the check of the synchronisation of the PACS chopper trigger with the SPEC detector readout, we used a diagnostic HK sampling frequency of 256 Hz and 1000 Hz. I selected measurement with the lower frequency for this summary. The TM file is FIST_SPT_Spec707a_choppDetecSync_redundant_20080828_03.tm. Furthermore, the Chopper SFT carried in open loop is used during this investigation. The referring TM file is FIST_SFTHeII_Chopper_002_20080824.tm. I also investigate the impact on the timekeys of the two PCSS HK import classes getRawMeasures and ValuesExtractor.getDiagnosticValues. Finally and as a comparison, I investigated the timekeys extracted from the data DECMEC header.