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ID Date Author Type Categoryup Subject Text Attachments
  190   Thu Dec 13 12:05:36 2007 albertoOmnistructureElectronicsThe new Butterworth seems to work quite wellIt works better probably because of the small
inductors I'm using this time.
The peak is at 30 MHz because I didn't have
 TF_New_Butterworth_12-Nov-2007_TF.pngBultervverth2.png 
  193   Mon Dec 17 11:47:13 2007 albertoUpdateElectronicsan alternative design for the RFAM monitor's filter at 33MhzSince the Butterworth turned out o be rather
wide-band, I tried an other configuration
for the 33 MHz filter. Attached are the simulated
 RFSim99-33MHz.pngRF99-SimmButterworthPrototype.pngRFSim99-33MHz-TFplot.png 
  246   Thu Jan 17 18:22:14 2008 AlbertoUpdateElectronicsRF Monitor Band-pass FilterAfter we finalized the schematic for the RF
monitor board based on buffered LC resonators,
on Richard Abbott's suggestion to avoid the
 RF166Mhz.pngChebyshevb.pngChebyshev2b.png 
  248   Fri Jan 18 11:53:50 2008 AlbertoUpdateElectronicsRF Monitor Band-pass FilterThe response is asymmetric and on the left
side of the peak, we have at least 33dB within
33Mhz, which is enough for all the frequencies.
 Chebyshevb.png 
  268   Fri Jan 25 15:53:59 2008 AlbertoUpdateElectronics40 dB from the 3rd order ChebyschevI managed to tune the 7 knobs in the 3rd order
Chebyshev bandpass filter obtaining the tranfer
function attached to this entry. We have
 166MhzElog.png 
  285   Wed Jan 30 11:49:30 2008 AlbertoSummaryElectronicsRF monitor's filters final schematics and transfer functionsThese are the final schematics for the 6th
order Chebyshev filters of the RF monitor
board. I'm also attaching the TF as I measured.
 8x 
  314   Wed Feb 13 11:41:00 2008 AlbertoUpdateElectronicsSome characterization of the RF Monitor Box (StocMon)I'm attaching a table with some measurements
and the power spectrum from the pd to help
evaluate the numbers.
 CircuitCharacterization.pngalberto.spectrum3.png 
  321   Mon Feb 18 12:04:39 2008 AlbertoUpdateElectronicsRF Monitor (StocMon)I put the amplifiers next to the monitor on
the PSL table, layed the power and the RF
SMA cables out to the rack. I'm powering
 DSC_0443.JPG 
  329   Thu Feb 21 19:55:46 2008 ranaUpdateElectronics2 BNC Cables, 1 TeeI'm not sure where [COLOR=purple]Ward and
Miller went to Analyzer school[/COLOR], but
it was probably uncredited.
  
  331   Fri Feb 22 08:29:07 2008 AlbertoUpdateElectronicsRF Monitor (StocMon)[quote]I put the amplifiers next to the monitor
on the PSL table, layed the power and the
RF SMA cables out to the rack. I'm powering
  
  332   Fri Feb 22 08:33:18 2008 AlbertoUpdateElectronicsRF Monitor (StocMon)[quote]I put the amplifiers next to the monitor
on the PSL table, layed the power and the
RF SMA cables out to the rack. I'm powering
  
  333   Fri Feb 22 11:11:00 2008 robUpdateElectronicsREFLDD problem found
I used a network analyzer that actually works
to find a problem in the REFLDD electronics
  
  334   Fri Feb 22 11:13:15 2008 robUpdateElectronicsRF Monitor (StocMon)[quote] It took some times because the written
procedure to start the chiller is not very
precise.[/quote]
  
  337   Fri Feb 22 16:47:54 2008 robUpdateElectronicsBaloneyWell I guess Rana didn't study too hard at
Professor School, either.  If he'd even bothered
to actually read John's entry, he might have
 bustedHP.mov 
  347   Thu Feb 28 19:49:21 2008 robUpdateElectronicsRF Monitor (StocMon)
[quote]
With Ben, we hooked up the RF Monitor box
  
  397   Sun Mar 23 10:42:54 2008 ValeraSummaryElectronicsRFAM of the RF stabilization box is measuredI reconstructed Tobin's setup to measure the
RFAM after the RF stabilization box in the
166 MHz modulation path.
 RFAM.zipamplitudenoise.pdf 
  398   Mon Mar 24 13:03:54 2008 robUpdateElectronicsHP4195A is back

[quote]The swept sine output looks totally
  
  580   Thu Jun 26 22:08:33 2008 JenneUpdateElectronics3.7MHz bandstop filter in MC Servo The 3.7MHz elliptical bandstop filter that
I made during my SURF summer is now installed
in the MC servo loop to reduce the noise
 MCLoopGainBoth.pngTP1ASpectrumBoth.pngQmonWithFilt.pngMCOut2WithFilt.png 
  584   Fri Jun 27 18:03:46 2008 JenneUpdateElectronicsAnother bad cable in the MC servoEric was helping me to measure the response
of the LO input on the MC's Demod board,
and when we disconnected the end of the cable
  
  585   Fri Jun 27 18:21:01 2008 JenneUpdateElectronicsResponse of the LO input on the MC demod boardThe alarm handler has been flipping out saying
that the LO input of the MC's demod board
is too low, so at Rana's suggestion, Eric
  
  605   Mon Jun 30 15:56:22 2008 JenneUpdateElectronicsFixing the LO demod signal To make the alarm handler happy, at Rana and
John's suggestion I replaced R14 of the MC's
Demod board, changing it from 4.99 Ohms to
  
  888   Tue Aug 26 18:19:16 2008 ranaOmnistructureElectronicsResistor Noise at the 40mAs Stefan points out in his recent ISS ilog
entries at LLO, Daniel [COLOR=darkgreen]Sigg
recently wrote a
 SEI-RN_RNM.pdf 
  915   Wed Sep 3 18:43:19 2008 YoichiConfigurationElectronicsTwo more active probesI found two active probes, an HP41800A and
a Tektronix P6201.
Thanks John for telling me you saw them before.
 Tektronix-P6201-active-probe.pdf 
  939   Wed Sep 10 13:28:25 2008 YoichiSummaryElectronicsIOO rack lost -24V (recovered)Alberto, Yoichi

This morning, the MC suddenly started to
  
  1036   Wed Oct 8 22:23:43 2008 YoichiConfigurationElectronicsElectronics work bench cleanupYesterday, I cleaned up the electronics work
bench. I figured that keeping the work bench
in order has larger effect on the work efficiency
 Cleanup.jpg 
  1135   Fri Nov 14 17:41:50 2008 JenneOmnistructureElectronicsSweet New Soldering IronThe fancy new Weller Soldering Iron is now
hooked up on the electronics bench.  
 newSolderingIron.JPG 
  1139   Mon Nov 17 11:01:15 2008 AlbertoHowToElectronicsCalibrating the Frequency Standard of the MarconiI locked the [COLOR=purple][I]SRS Rubidium
Frequency Standard FS275[/I][/COLOR] to the
the 1pps from the GPS. The specs from the
 2023ASeriesOperatingManual.pdfSRS_FS275_Rubidium_Frequency_Standard.pdf 
  1146   Wed Nov 19 10:32:11 2008 AlbertoConfigurationElectronicsAll the Marconi Set to the Rubidium Frequency StandardI placed the SRS Rubidium FS275 over the PSL
rack, next to the frequency counter. This
one and the Marconi on the PSL rack have
  
  1147   Wed Nov 19 18:02:18 2008 ranaConfigurationElectronicsAll the Marconi Set to the Rubidium Frequency StandardNot sure what was going on before. I changed
the frequency counter to use an AC coupled
input, and had it average
  
  1208   Tue Dec 30 18:51:18 2008 rana,yoichiConfigurationElectronicsIlluminator Power Supply reset[COLOR=blue][B]We noticed that none of the
illuminators were working.[/B][/COLOR]
  
  1252   Sat Jan 24 11:50:24 2009 AlbertoConfigurationElectronicsPhotodiode Filters' Transfer FunctionsI found an elog entry by Jenne with the measurement
of the transfer functions of the filters
of some of our photodetectors. Since it might
  
  1315   Mon Feb 16 23:09:52 2009 ranaUpdateElectronicsMC Servo Board offset gone bad!The attached plot shows that someone broke
the MC_SUM_MON channel around 10:30 AM this
past Wednesday the 11th. This is the EPICS
 mcoff.png 
  1326   Thu Feb 19 22:40:33 2009 KiwamuUpdateElectronicsPSL angle QPDI checked a broken QPD, which was placed
for PSL angle monitor, and finally I cocluded
one segment of the quadrant diode was
  
  1345   Mon Mar 2 16:27:40 2009 AlbertoConfigurationElectronicsMC Drum Mode SR560 Preamplifier ReplacedToday I checked out the SR560 around the
lab. I confirmed that the one with the label
"channel A noisy" is effectively
  
  1407   Mon Mar 16 15:19:52 2009 OsamuDAQElectronicsSR785I borrowed SR785 to measure AA, AI noise
and TF.
  
  1445   Mon Mar 30 15:51:27 2009 steveUpdateElectronicsHP4291A left the lab to be repairedEric Gustafson is handling the old HP4291A
rehabilitation. Tarac picked both units up
today.
  
  1476   Sun Apr 12 19:31:43 2009 ranaSummaryElectronicsAmphony 2500 HeadphonesWe bought the Amphony 2500 Digital Wireless
headphones recently. The other cheapo headphones
we have are OK for control room use, but
  
  1664   Wed Jun 10 01:52:34 2009 AlbertoUpdateElectronicsMC length and Marconis' frequenciesPete, Rob, Alberto,
yesterday we thought that some of
the problems we were having in locking the
  
  1681   Tue Jun 16 20:03:41 2009 AlbertoUpdateElectronicsRequirements on Wenzel MultiplierFor
the 40m Upgrade, we plan to 
 SummaryOfResult.pdf 
  1724   Wed Jul 8 18:46:56 2009 DmassAoGElectronicsBeam Scan FunkyThe beam scan (which has been living in
the bridge subbasement for a bit now) is
in a state of imperfection.
 beamscanhead3.pngbeamscanhead6.png 
  2014   Mon Sep 28 23:13:14 2009 JenneConfigurationElectronicsRob is breaking stuff....Koji and I were looking for an extender
card to aid with MZ board testing. 
Rob went off on a quest to find one. 
  
  2019   Tue Sep 29 16:14:44 2009 robConfigurationElectronicsRob is breaking stuff....


   
        
            
  
  2064   Wed Oct 7 11:18:40 2009 kiwamuSummaryElectronicsracks of electronics 
I took the pictures of all racks
of electronics yesterday, and then uploaded
  
  2110   Sun Oct 18 19:55:45 2009 ranaConfigurationElectronicsIP POS is back: ND filter gone, new resistors inIts back in and re-centered. Our
next move on IPPOS should be to replace its
steering mirror with something bigger and
 IMG_0068.JPGIMG_0072.JPG 
  2112   Sun Oct 18 22:06:15 2009 ranaConfigurationElectronicsIP POS is back: ND filter gone, new resistors inI tried to compare the IP_POS time series
with the IPANG and MC_TRANS but was foiled
at first:
 Untitled.png 
  2118   Mon Oct 19 14:48:15 2009 rana, robSummaryElectronicspiezo jena measuring boxAttached is the schematic of the Piezo Jena
driver measuring box made in a Pomona box:
 PA160153.JPGPA160151.JPG 
  2244   Wed Nov 11 20:57:06 2009 kiwamuUpdateElectronicsMulti-resonant EOM --- LC tank circuit ---I have been working about multi-resonant
EOM since last week.
In order to characterize the behavior
 DSCN0160.JPGLCtank_complete.png 
  2262   Fri Nov 13 03:38:47 2009 kiwamuUpdateElectronicsmulti-resonant EOM --- impedance of LC tank circuit ----I have measured the impedance of the LC
tank circuit which I referred on my
last entry.
 LCtank_impedance.pngLCtank_model.png 
  2263   Fri Nov 13 05:03:09 2009 kiwamuUpdateElectronicsmulti-resonant EOM --- input impedance of LC tank ----I measured the input impedance of the
LC tank circuit with the transformer. The
 input_impedance.pnginput_impedance2.png 
  2286   Tue Nov 17 21:10:35 2009 ranaSummaryElectronicsBusby Low Noise Box: Photos and Upgrades   IMG_0217.JPGbusby-noise.png 
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