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 Thu Aug 20 00:21:51 2020, gautam, Update, Electronics, First look at HV coil driver 
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 Sun Aug 23 23:36:58 2020, gautam, Update, Electronics, First look at HV coil driver
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Wed Aug 26 16:12:25 2020, gautam, Update, Electronics, Test mass coil current requirements
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Tue Sep 1 15:39:04 2020, gautam, Update, Electronics, HV coil driver oscillations fixed
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Thu Oct 22 11:14:47 2020, gautam, Update, Electronics, HV coil driver packaged into 2U chassis
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Thu Oct 22 13:04:42 2020, rana, Update, Electronics, HV coil driver packaged into 2U chassis
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Thu Oct 22 22:01:53 2020, gautam, Update, Electronics, HV coil driver packaged into 2U chassis
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Fri Oct 23 09:03:43 2020, anchal, Update, Electronics, HV coil driver packaged into 2U chassis
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Thu Nov 12 14:55:35 2020, gautam, Update, Electronics, More systematic noise characterization
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Thu Nov 12 15:40:42 2020, Koji, Update, Electronics, More systematic noise characterization
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Mon Nov 16 00:02:34 2020, rana, Update, Electronics, More systematic noise characterization
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Wed Jan 20 10:13:06 2021, gautam, Update, Electronics, HV Power supply bypassing
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Mon Feb 1 12:30:21 2021, gautam, Update, Electronics, More careful characterization
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Wed Feb 10 21:14:03 2021, gautam, Update, Electronics, Production version of the HV coil driver tested
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Fri Feb 26 16:31:02 2021, gautam, Update, Electronics, Production version of the HV coil driver tested with KEPCO HV supplies
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Fri Feb 26 20:20:43 2021, Koji, Update, Electronics, Production version of the HV coil driver tested with KEPCO HV supplies
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Sat Feb 27 17:25:42 2021, gautam, Update, Electronics, Production version of the HV coil driver tested with KEPCO HV supplies
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Thu May 20 16:56:21 2021, Koji, Update, Electronics, Production version of the HV coil driver tested with KEPCO HV supplies
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Message ID: 15639
Entry time: Thu Oct 22 22:01:53 2020
In reply to: 15638
Reply to this: 15640
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| Author: |
gautam |
| Type: |
Update |
| Category: |
Electronics |
| Subject: |
HV coil driver packaged into 2U chassis |
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It's not so easy to directly measure this I think, because the filtering is rather aggressive. Attachment #1 shows the measured transfer function (dots) vs the model and Attachment #2 shows the noise. I think this checks out - but I can't definitively rule out some excess noise at 100 Hz from this stage. Because the gain of the HV stage is x31, we'd need a preamp with better than 1nV/rtHz to directly measure the noise I guess. The Acromag noise model in Attachment #2 is based on a measurement I describe here.
| Quote: |
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what is the noise level before the HV stage? i.e. how well is the acromag noise being filtered?
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