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  40m Log, Page 113 of 346  Not logged in ELOG logo
ID Date Author Type Categoryup Subject Text Attachments
  15735   Tue Dec 15 12:38:41 2020 gautamUpdateElectronicsDC power stripI installed a DC power strip (24 V
variant, 12 outlets available) on the NW
upright of the 1X1 rack. This is for the
  
  15741   Sat Dec 19 20:24:25 2020 gautamUpdateElectronicsWFS hardware installI installed 4 chassis in the rack 1X2 (characterization
on the E-bench was deemed satisfactory, I
will upload the analysis later). I ran out
  
  15773   Wed Jan 20 10:13:06 2021 gautamUpdateElectronicsHV Power supply bypassingSummary:

Installing 10uF bypass capacitors
on the High
 bypassCaps.pdfIMG_9079.jpgIMG_9078.jpgHVampNoise_driven_chassis.pdfprintCoilCurrents.pdf 
  15786   Mon Feb 1 12:30:21 2021 gautamUpdateElectronicsMore careful characterizationSummary:


Swapping out the KEPCO
HV supplies (linear) I was using for a pair
 HVPS.pdfHV_testckt.pdftotalNoise.pdf 
  15798   Wed Feb 10 14:14:58 2021 gautamUpdateElectronicsCustom cables receivedWe received the custom cables to test the
new suspension electronics. They are under
my desk. So we are ready.
 satWiring.pdf 
  15802   Wed Feb 10 21:14:03 2021 gautamUpdateElectronicsProduction version of the HV coil driver testedSummary:

I did what I consider to be a comprehensive
set of tests on the production version of
 inputDiffRecTF.pdfLVnoises.pdftotalNoise.pdftimeDomainTests.pdf 
  15815   Thu Feb 18 03:20:09 2021 KojiSummaryElectronicsCurrent Rack MapFor your planning:  rack_plan.pdf 
  15820   Thu Feb 18 20:24:48 2021 KojiSummaryElectronicsA bunch of electronics receivedTodd provided us a bunch of electronics.
I went to Downs to pick them up this afternoon
and checked the contents in the box. Basically,
 IMG_0416.jpeg 
  15828   Sat Feb 20 10:01:48 2021 gautamSummaryElectronicsA bunch of electronics receivedWill we also be receiving the additional
34 Satellite Amplifier PCBs?
  
  15830   Sat Feb 20 16:46:17 2021 KojiSummaryElectronicsA bunch of electronics receivedWe received currently available sets. We
are supposed to receive more coil drivers
and sat amps, etc. But they are not ready
  
  15846   Fri Feb 26 16:31:02 2021 gautamUpdateElectronicsProduction version of the HV coil driver tested with KEPCO HV suppliesKoji asked me to test the production version
of the coil driver with the KEPCO HV supplies.
See 
 totalNoise_KEPCO.pdf 
  15847   Fri Feb 26 20:20:43 2021 KojiUpdateElectronicsProduction version of the HV coil driver tested with KEPCO HV suppliesThis is very disappointing. Even with KEPCO
linear supply with the improved HV driver
circuit, the noise level is significantly
  
  15848   Sat Feb 27 17:25:42 2021 gautamUpdateElectronicsProduction version of the HV coil driver tested with KEPCO HV suppliesI will try the test of switching out KEPCOs
one at a time for the HP. Given that the
passive RC filter doesn't filter
  
  15865   Thu Mar 4 23:57:35 2021 KojiSummaryElectronicsInspection of the new custom dsub cablesI made the inspection of the new custom
DSub cables (came from Texas).

The shelled version gives us some
 6x 
  15866   Fri Mar 5 00:53:09 2021 KojiSummaryElectronicsA bunch of electronics receivedReceived additional front/rear panels.
Updated the original entry and Wiki [Link]

 
  
  15868   Fri Mar 5 15:03:28 2021 gautamSummaryElectronicsA bunch of electronics receivedThe PCBs for the D1002593
BIO I/F (5pcs ea of D1001050
and D1001266)
  
  15870   Fri Mar 5 15:32:53 2021 KojiSummaryElectronicsA bunch of electronics receivedThe parts will be ordered by Koji
The components for the additional BIO I/F
have been ordered.
  
  15885   Tue Mar 9 12:41:29 2021 KojiSummaryElectronicsInvestigation on the invacuum Dsub cablesI believe the aLIGO style invac dsub cables
and the conventional 40m ones are incompatible.
While the aLIGO spec is that Pin1
 SOS_OSEM_cabling.pdf 
  15933   Wed Mar 17 15:04:20 2021 gautamUpdateElectronicsRibbon cable for chassisI had asked Chub to order 100ft ea of 9,
15 and 25 conductor ribbon cable. These arrived
today and are stored in the VEA alongside
 IMG_9139.jpg 
  15941   Thu Mar 18 18:06:36 2021 gautamUpdateElectronicsModified Sat Amp and Coil DriverI uploaded the annotated schematics (to
be more convenient than the noise analysis
notes linked from the DCC page) for the 
  
  15950   Sun Mar 21 19:31:29 2021 ranaSummaryElectronicsRTL-SDR for monitoring RF noise / interferenceWhen we're debugging our RF system,
either due to weird demod phases, or low
SNR, or non-stationary noise in the PDH signals,
 Screen_Shot_2021-03-21_at_7.43.24_PM.png 
  15968   Thu Mar 25 18:05:04 2021 gautamUpdateElectronicsStuffed HV coil drivers received from Screaming CircuitsI think the only part missing for assembly
now are 4 2U chassis. The PA95s need to be
soldered on as well (they didn't arrive
  
  15980   Wed Mar 31 00:40:32 2021 KojiUpdateElectronicsElectronics Packaging for assembly workI've worked on packing the components
for the following chassis
- 5 16bit AI chassis
 P_20210330_233508.jpgP_20210330_233618.jpg 
  15981   Wed Mar 31 03:56:37 2021 KojiSummaryElectronicsA bunch of electronics receivedWe have received 9x 18bit DAC adapter boards
(D1000654)
 P_20210331_013257.jpgP_20210331_014020.jpg 
  15986   Thu Apr 1 18:16:28 2021 KojiUpdateElectronicsElectronics Packaging for assembly workAll small
components are packed in the boxes. They
are ready to ship.

 
  
  15990   Fri Apr 2 01:26:41 2021 gautamUpdateElectronicsREFL55 chain checkout again, seems fine[koji,
gautam]

Summary:
  
  16033   Wed Apr 14 23:55:34 2021 gautamUpdateElectronicsHV Coil driver assemblyI've occcupied the southernmost electronics
bench for assembling the 4 production version
HV coil driver chassis. I estimate it will
  
  16070   Thu Apr 22 01:42:38 2021 KojiSummaryElectronicsHV Supply ComparisonNew HV power supply from Company 'M'
has been delivered. So I decided to compare
the noise levels of some HV supplies in the
 HV_Supply_PSD_H.pdfHV_Supply_PSD_K.pdfHV_Supply_PSD_M.pdfHV_Supply_PSD.pdf 
  16140   Fri May 14 03:29:50 2021 KojiUpdateElectronicsHV Driver noise test with the new HV power supply from MatsusadaI believe I did the identical test with
the one in [40m
ELOG 15786]. The + input of PA95 was
 HV_Driver_PSD.pdf 
  16148   Thu May 20 16:56:21 2021 KojiUpdateElectronicsProduction version of the HV coil driver tested with KEPCO HV suppliesHP HV power supply ( HP6209
) were returned to Downs
 P_20210520_154523_copy.jpg 
  16150   Fri May 21 00:15:33 2021 KojiUpdateElectronicsDC Power Strip delivered / storedDC Power Strip Assemblies delivered and
stored behind the Y arm tube (Attachment
1)
 9x 
  16155   Mon May 24 08:38:26 2021 ChubUpdateElectronics18-bit AI, 16-bit AI and 16-bit AA- High priority units: 2x 18AI / 1x 16AI
/ 3x 16AA

All six are reworked and on the
  
  16160   Tue May 25 17:08:17 2021 ChubUpdateElectronicschassis rework complete!All remaining chasses have been reworked
and placed on the floor along the west wall
in Room 104. 
 40M_chassis_reworked_5-25-21.jpg 
  16162   Wed May 26 02:00:44 2021 gautamUpdateElectronicsCoil driver noiseI was preparing a short write-up / test
procedure for the custom HV coil driver,
when I thought of something I can't resolve.
 coilDriverTopologies.pdfshotVthermal.pdf 
  16211   Thu Jun 17 22:19:12 2021 KojiUpdateElectronics25 HAM-A coil driver units delivered25 HAM-A coil driver units
were fabricated by Todd and I've transported
them to the 40m.
 P_20210617_195811.jpg 
  16349   Mon Sep 20 20:43:38 2021 TegaUpdateElectronicsSat Amp modificationsRunning update of Sat Amp modification
work, which involves the following procedure (x8)
per unit:
 IMG_20210920_203456226.jpg 
  16356   Wed Sep 22 17:22:59 2021 TegaUpdateElectronicsSat Amp modifications[Koji, Tega]

 

Decided to do a quick check of
  
  16357   Thu Sep 23 14:17:44 2021 TegaUpdateElectronicsSat Amp modifications debugging updateDebugging complete.

All units now have the correct
TP4 voltage reading needed to drive a
  
  16377   Mon Oct 4 18:35:12 2021 PacoUpdateElectronicsSatellite amp box adapters[Paco]

I have finished assembling the
1U adapters from 8 to 5 DB9 conn. for the
 pcb_no_flush.jpg1U_assembly.jpgfourunits.jpg 
  16378   Mon Oct 4 20:46:08 2021 KojiUpdateElectronicsSatellite amp box adaptersThanks. You should be able to find the
chassis-related hardware on the left side
of the benchtop drawers at the middle workbench.
  
  16379   Mon Oct 4 21:58:17 2021 TegaUpdateElectronicsSat Amp modificationsTrying to finish 2 more Sat Amp units so
that we have the 7 units needed for the X-arm
install. 
  
  16380   Tue Oct 5 17:01:20 2021 KojiUpdateElectronicsSat Amp modificationsMake sure the inputs for the PD amps are
open. This is the current amplifier and we
want to leave the input pins open for the
  
  16386   Wed Oct 6 16:31:02 2021 TegaUpdateElectronicsSat Amp modifications[Tega, Koji]

(S2100737) - Debugging showed
that the opamp, AD822ARZ, for PD2 circuit
  
  16387   Thu Oct 7 02:04:19 2021 KojiUpdateElectronicsSatellite amp adapter chassisThe 4 units of Satellite Amp Adapter were
done:
- The ears were fixed with the screws
 P_20211006_205044.jpg 
  16411   Mon Oct 18 16:48:32 2021 TegaUpdateElectronicsSat Amp modifications[S2100738, S2100745, S2100751] Completed
three more Sat Amp units modification with
seven remaining.
 IMG_20211018_162918574.jpg 
  16427   Tue Oct 26 13:27:07 2021 TegaSummaryElectronicsSat Amp modification SummaryModifications and testing of SatAmp
units COMPLETE. Attachments 1 & 2 show
all 19 units, one installed unit and the
 SapAmpModStack.jpgSatAmpInstalled.jpg 
  16428   Tue Oct 26 14:53:24 2021 KojiUpdateElectronicsRack1. We have a rack at the 40m storage. We
are free to take it to the lab. If there
is a tag, tell the info to Liz. Let's
 P_20211026_143814.jpg 
  16436   Wed Oct 27 19:34:52 2021 KojiSummaryElectronicsNew electronics racks1. The rack we cleaned today (came from
West Bridge) will be placed between 1X3 and
1X4, right next to 1X4 (after removing the
 P_20211027_180737.jpgP_20211027_180443.jpgP_20211027_180408.jpgP_20211027_180139.jpg 
  16513   Thu Dec 16 15:04:12 2021 ChubUpdateElectronicsITMX feedthroughs and in-vac cables installedThe ITMX 10" flange with four DSUB-25
feedthroughs has been install with the cables
connected at the in-vac side.  See photo;
 ITMX_feedthrough_install_12-16-21.jpg 
  16515   Thu Dec 16 15:54:08 2021 KojiUpdateElectronicsITMX feedthroughs and in-vac cables installedThanks for the installation.

With regard to the connector convention,
let's use the attached arrangement so
 PXL_20211216_235056582.jpg 
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