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40m Log |
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Mon Jul 4 10:30:37 2016, ericq, Update, General, Preliminary vent plans
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Tue Jul 5 17:14:02 2016, ericq, Update, General, Vent progress 
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Tue Jul 5 19:10:41 2016, rana, Update, General, Vent progress
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Tue Jul 5 21:51:35 2016, ericq, Update, General, Vent progress
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Tue Jul 5 23:38:42 2016, gautam, Update, General, Vent progress - ETMX SUS Coil driver electronics investigation
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Wed Jul 6 22:58:01 2016, gautam, Update, General, Vent progress - ETMX SUS Coil driver electronics investigation
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Thu Jul 7 00:25:07 2016, ericq, Update, General, Vent progress - ETMX SUS Coil driver electronics investigation
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Thu Jul 7 10:49:03 2016, gautam, Update, General, Vent progress - ETMX SUS Coil driver electronics investigation
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Fri Jul 8 11:35:45 2016, gautam, Update, General, Vent progress - ETMX SUS Coil driver electronics investigation
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Fri Jul 8 11:48:09 2016, Koji, Update, General, Vent progress - ETMX SUS Coil driver electronics investigation
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Fri Jul 8 14:03:26 2016, ericq, Update, General, ETMX removed from suspension
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Fri Jul 8 16:33:26 2016, ericq, Update, General, ETMX removed from suspension
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Fri Jul 8 20:44:09 2016, Koji, Update, General, ETMX removed from suspension 6x
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Sun Jul 10 15:38:01 2016, ericq, Update, General, ETMX in guiderod/standoff gluing fixture 6x
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Tue Jul 12 16:08:00 2016, ericq, Update, General, ETMX ruby guided gluing
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Wed Jul 13 21:13:51 2016, Koji, Update, General, ETMX guide rod gluing / ETMY Magnet gluing 13x
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Thu Jul 14 22:29:57 2016, ericq , Update, General, ETMX guide rod gluing / ETMY Magnet gluing
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Fri Jul 15 16:23:51 2016, ericq , Update, General, Gluing setbacks 
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Tue Jul 19 16:39:29 2016, Lydia, Update, General, ETMX magnet gluing/guiderod excess glue removed 
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Wed Jul 20 13:58:55 2016, Steve, Update, SUS, SUS damping out of vac chamber   
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Thu Jul 21 17:01:59 2016, ericq, Update, General, ETMX magnet gluing/guiderod excess glue removed
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Fri Jul 22 23:03:23 2016, gautam, Update, General, ETMX suspension - progress    
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Sun Jul 24 03:43:56 2016, ericq, Update, General, Magnet positioning
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Mon Jul 25 13:01:49 2016, ericq, Update, General, ETMX suspension - progress    
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Mon Jul 25 13:47:19 2016, rana, Update, General, ETMX suspension - progress
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Mon Jul 25 17:01:54 2016, Steve, Update, SUS, ETMX suspension - progress
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Mon Jul 25 20:37:46 2016, gautam, Update, General, ETMX suspension - Side OSEM test
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Tue Jul 26 18:07:57 2016, gautam, Update, General, ETMX suspension - Further OSEM Tests
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Thu Jul 28 03:22:28 2016, ericq, Update, General, ETMX magnets re-reglued
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Thu Jul 28 13:49:44 2016, gautam, Update, General, ETMX magnets re-reglued 
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Thu Jul 28 17:48:17 2016, gautam, Update, General, ETMY LR magnet broke off
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Thu Jul 28 22:43:03 2016, rana, Update, General, ETMY UL magnet broke off
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Wed Aug 3 10:52:03 2016, Steve, Update, General, ETMY soaking dish  
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Fri Jul 29 03:32:30 2016, ericq, Update, General, ETMX suspended once more
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Fri Jul 29 13:17:34 2016, Koji, Update, General, Oven
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Thu Jul 14 01:00:33 2016, Koji, Update, General, ETMX ruby guided gluing
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Thu Jul 28 16:43:01 2016, Lydia, Update, General, ETMX aluminium standoff groove condition   
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Fri Jul 8 21:22:38 2016, gautam, Update, General, Vent progress - ETMX SUS Coil driver electronics investigation
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Wed Jul 6 09:34:26 2016, Steve, Update, General, PRM sensing voltage LR
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Wed Jul 6 19:36:45 2016, Koji, Update, General, SUS Vmon  
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Thu Jul 7 15:23:39 2016, ericq, Update, General, SUS Vmon
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Thu Jul 7 16:05:55 2016, Koji, Update, General, SUS Vmon
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Thu Jul 7 17:12:50 2016, Johannes, Update, General, Vent progress   
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Tue Jul 12 23:51:16 2016, Johannes, Update, General, Vent progress - ETMY inspection 
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Wed Jul 13 00:38:25 2016, Johannes, Update, General, Vent progress - ETMY attempted repositioning
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Tue Jul 19 13:21:42 2016, Johannes, Update, General, Vent progress - ETMY attempted repositioning
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Sun Jul 10 17:33:00 2016, ericq, Update, General, Vent progress
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Mon Jul 11 15:13:22 2016, gautam, Update, General, Vent progress: in-date First Contact procured
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Message ID: 12247
Entry time: Tue Jul 5 23:38:42 2016
In reply to: 12246
Reply to this: 12261
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Author: |
gautam |
Type: |
Update |
Category: |
General |
Subject: |
Vent progress - ETMX SUS Coil driver electronics investigation |
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With Koji's help, I've hacked together an arrangement that will allow us to monitor the output of the coil driver to the UL coil.
The arrangement consists of a short custom ribbon cable with female DB25 connectors on both ends - the particular wire sending the signal to the UL coil has a 100 ohm resistor wired in series, because the coil has resistance ~20ohm, and the output of the coil driver board has a series 200(?) ohm resistor, so by directly monitoring the voltage at this point, we may not see a glitch as it may register too small. Tangentially related: the schematic of the coil driver board suggests that the buffered output monitor has a gain of 0.5.
To monitor the voltage, I use the board to which the 4 Oplev signals are currently hooked up. Channel 7 on this particular board (corresponding to ADC channel 30 on c1scx) was conveniently wired up for some prior test, so I used this channel. Then, I modified the C1SCX model to add a testpoint to monitor the output of this ADC. Then, I turned OFF the input on the coil output filter for the UL Coil (i.e. C1:SUS-ETMX_ULCOIL_SW1) so that we can send a known, controlled signal to the UL Coil by means of awggui. Next, I added an excitation at 5 Hz, amplitude 20 counts (as the signal to the coil under normal conditions was approximately of this amplitude) to the excitation channel of the same filter module, which is the state I am leaving the setup in for the night. I have confirmed that I see this 5Hz oscillation on the monitor channel I set up. Oddly, the 0 crossings of the oscillations happen at approximately -1000 counts and not at 0 counts. I wonder where this offset is coming from? The two points I am monitoring the voltage across is shown in the attached photograph - the black clip is connected to the lead carrying the return signal from the coil.
I also wanted to set up a math block in the model itself that monitors, in addition to the raw ADC channel, a copy from which the known applied signal has been cancelled, as presumably a glitch would be more obvious in such a record. However, I was unable to access the excitation channel to the ULCOIL filter from within the SCX model. So I am just recording the raw output for tonight... |
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