evan.hall@LIGO.ORG - posted 23:41, Wednesday 22 July 2015 - last comment - 01:42, Sunday 26 July 2015(19857)
DTT rampdown abort not working?
I was running an ASC OLTF swept-sine template with a request for a 10 s rampdown time.
From the EXCMON of the drive channel, it seems that this rampdown did not happen. Rather, the excitatation continued at full strength for about 10 s and then cut off abruptly.
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Yes, it appears this feature is broken, at least in swept sine mode.
I pushed the abort button around 06:20:00 Z (around the 10 second mark in the attachment). The excitation continues at full strength until the last second. Then, as far as I can tell, there is some slightly different waveform being written to the excitation channel for about a second. Then the excitation stops abruptly, causing a lockloss.
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