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| 40m Log |
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 Wed Apr 26 01:00:23 2017, gautam, Update, General, DRMI locking 
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 Fri Apr 28 02:04:36 2017, gautam, Update, General, DRMI locking
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Fri Apr 28 13:56:26 2017, rana, Update, General, DRMI locking
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Mon May 1 16:29:51 2017, gautam, Update, General, DRMI locking
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Mon May 1 21:45:54 2017, ericq, Update, General, DRMI locking
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Wed May 3 18:45:45 2017, rana, Update, General, DRMI locking
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Thu May 4 19:03:15 2017, gautam, Update, General, DRMI locking - preliminary MICH NB
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Fri May 5 10:13:02 2017, ericq, Update, General, MICH NB questions
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Fri May 5 12:10:53 2017, gautam, Update, General, MICH NB questions
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Sat May 6 21:52:11 2017, rana, Update, General, MICH NB questions
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Wed May 10 01:56:06 2017, gautam, Update, General, MICH NB - OL coupling
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Wed May 10 16:53:38 2017, rana, Update, General, MICH NB - OL coupling
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Wed May 10 17:17:05 2017, gautam, Update, General, DAC / Coil Driver noise
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Wed May 10 17:46:44 2017, gautam, Update, General, DAC / Coil Driver noise - SRM coil driver + dewhite board removed
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Thu May 11 09:45:46 2017, rana, Update, General, DAC / Coil Driver noise - SRM coil driver + dewhite board removed
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Thu May 11 18:59:22 2017, gautam, Update, General, SRM coil driver + dewhite board initial survey
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Fri May 12 01:36:04 2017, gautam, Update, General, SRM coil driver + dewhite board LISO modeling
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Fri May 12 12:34:55 2017, gautam, Update, General, ITM and BS coil driver + dewhite board pulled out
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Fri May 12 18:50:08 2017, gautam, Update, General, ITM and BS coil driver + dewhite board pulled out
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Mon May 22 13:37:01 2017, gautam, Update, General, DAC noise estimate
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Tue May 23 22:58:23 2017, gautam, Update, General, De-Whitening board noises
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Thu May 25 19:27:29 2017, gautam, Update, General, Coil driver board noises
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Mon May 29 16:47:38 2017, gautam, Update, General, Coil driver boards reinstalled
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Tue May 30 16:02:59 2017, gautam, Update, General, Coil driver boards reinstalled
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Thu Jun 1 00:10:15 2017, gautam, Update, General, Coil driver boards reinstalled
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Fri Apr 28 19:32:06 2017, gautam, Update, General, DRMI locking - PRCL angular FF
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Message ID: 12969
Entry time: Wed May 3 18:45:45 2017
In reply to: 12962
Reply to this: 12972
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| Author: |
rana |
| Type: |
Update |
| Category: |
General |
| Subject: |
DRMI locking |
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| Quote: | Comparing counts doesn't get you anywhere; each PD has different whitening gain which may vary from measurement to measurement. The better thing to compare is Volts coming out of the demod board, since this (hopefully) only changes when we touch the PD or analog signal chain; this is what I used for the most recent DRMI sensing measurements. (ELOG 11589) We have calibrated actuator channels in the CAL model, which will give you the control signal in m for the DRMI lengths. Perhaps you can convert your sensing matrix measurement to demod board output volts per meter to compare with the last measurement.
Also, the monitor ports are the LEMO ports to the left; the SMA ports where the signal is coming from are from a daughter board that has a better output opamp that the nominal output; we're using the same output on the REFL11 and AS55 demod boards. |
Wrong! RTFS.
SMA outputs are the bare, passive outputs of the mixer/lowpass.
TNC outputs are the low-noise, acti amplified outputs via the daughter board.
LEMO outputs are the high noise, G=2, LT1125 buffered outputs |