| ID |
Date |
Author |
Type |
Category |
Subject |
Text |
 |
|
15735
|
Tue Dec 15 12:38:41 2020 |
gautam | Update | Electronics | DC power strip | I 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 |
gautam | Update | Electronics | WFS hardware install | I 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 |
gautam | Update | Electronics | HV Power supply bypassing | Summary:
Installing 10uF bypass capacitors
on the High |
|
|
15786
|
Mon Feb 1 12:30:21 2021 |
gautam | Update | Electronics | More careful characterization | Summary:
Swapping out the KEPCO
HV supplies (linear) I was using for a pair |
|
|
15798
|
Wed Feb 10 14:14:58 2021 |
gautam | Update | Electronics | Custom cables received | We received the custom cables to test the
new suspension electronics. They are under
my desk. So we are ready. |
|
|
15802
|
Wed Feb 10 21:14:03 2021 |
gautam | Update | Electronics | Production version of the HV coil driver tested | Summary:
I did what I consider to be a comprehensive
set of tests on the production version of |
|
|
15815
|
Thu Feb 18 03:20:09 2021 |
Koji | Summary | Electronics | Current Rack Map | For your planning: |
|
|
15820
|
Thu Feb 18 20:24:48 2021 |
Koji | Summary | Electronics | A bunch of electronics received | Todd provided us a bunch of electronics.
I went to Downs to pick them up this afternoon
and checked the contents in the box. Basically, |
|
|
15828
|
Sat Feb 20 10:01:48 2021 |
gautam | Summary | Electronics | A bunch of electronics received | Will we also be receiving the additional
34 Satellite Amplifier PCBs? |
|
|
15830
|
Sat Feb 20 16:46:17 2021 |
Koji | Summary | Electronics | A bunch of electronics received | We 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 |
gautam | Update | Electronics | Production version of the HV coil driver tested with KEPCO HV supplies | Koji asked me to test the production version
of the coil driver with the KEPCO HV supplies.
See |
|
|
15847
|
Fri Feb 26 20:20:43 2021 |
Koji | Update | Electronics | Production version of the HV coil driver tested with KEPCO HV supplies | This 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 |
gautam | Update | Electronics | Production version of the HV coil driver tested with KEPCO HV supplies | I 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 |
Koji | Summary | Electronics | Inspection of the new custom dsub cables | I 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 |
Koji | Summary | Electronics | A bunch of electronics received | Received additional front/rear panels.
Updated the original entry and Wiki [Link]
|
|
|
15868
|
Fri Mar 5 15:03:28 2021 |
gautam | Summary | Electronics | A bunch of electronics received | The PCBs for the D1002593
BIO I/F (5pcs ea of D1001050
and D1001266) |
|
|
15870
|
Fri Mar 5 15:32:53 2021 |
Koji | Summary | Electronics | A bunch of electronics received | The 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 |
Koji | Summary | Electronics | Investigation on the invacuum Dsub cables | I believe the aLIGO style invac dsub cables
and the conventional 40m ones are incompatible.
While the aLIGO spec is that Pin1 |
|
|
15933
|
Wed Mar 17 15:04:20 2021 |
gautam | Update | Electronics | Ribbon cable for chassis | I 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 |
|
|
15941
|
Thu Mar 18 18:06:36 2021 |
gautam | Update | Electronics | Modified Sat Amp and Coil Driver | I 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 |
rana | Summary | Electronics | RTL-SDR for monitoring RF noise / interference | When we're debugging our RF system,
either due to weird demod phases, or low
SNR, or non-stationary noise in the PDH signals, |
|
|
15968
|
Thu Mar 25 18:05:04 2021 |
gautam | Update | Electronics | Stuffed HV coil drivers received from Screaming Circuits | I 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 |
Koji | Update | Electronics | Electronics Packaging for assembly work | I've worked on packing the components
for the following chassis
- 5 16bit AI chassis |
|
|
15981
|
Wed Mar 31 03:56:37 2021 |
Koji | Summary | Electronics | A bunch of electronics received | We have received 9x 18bit DAC adapter boards
(D1000654) |
|
|
15986
|
Thu Apr 1 18:16:28 2021 |
Koji | Update | Electronics | Electronics Packaging for assembly work | All small
components are packed in the boxes. They
are ready to ship.
|
|
|
15990
|
Fri Apr 2 01:26:41 2021 |
gautam | Update | Electronics | REFL55 chain checkout again, seems fine | [koji,
gautam]
Summary: |
|
|
16033
|
Wed Apr 14 23:55:34 2021 |
gautam | Update | Electronics | HV Coil driver assembly | I'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 |
Koji | Summary | Electronics | HV Supply Comparison | New HV power supply from Company 'M'
has been delivered. So I decided to compare
the noise levels of some HV supplies in the |
|
|
16140
|
Fri May 14 03:29:50 2021 |
Koji | Update | Electronics | HV Driver noise test with the new HV power supply from Matsusada | I believe I did the identical test with
the one in [40m
ELOG 15786]. The + input of PA95 was |
|
|
16148
|
Thu May 20 16:56:21 2021 |
Koji | Update | Electronics | Production version of the HV coil driver tested with KEPCO HV supplies | HP HV power supply ( HP6209
) were returned to Downs |
|
|
16150
|
Fri May 21 00:15:33 2021 |
Koji | Update | Electronics | DC Power Strip delivered / stored | DC Power Strip Assemblies delivered and
stored behind the Y arm tube (Attachment
1) |
9x |
|
16155
|
Mon May 24 08:38:26 2021 |
Chub | Update | Electronics | 18-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 |
Chub | Update | Electronics | chassis rework complete! | All remaining chasses have been reworked
and placed on the floor along the west wall
in Room 104. |
|
|
16162
|
Wed May 26 02:00:44 2021 |
gautam | Update | Electronics | Coil driver noise | I was preparing a short write-up / test
procedure for the custom HV coil driver,
when I thought of something I can't resolve. |
|
|
16211
|
Thu Jun 17 22:19:12 2021 |
Koji | Update | Electronics | 25 HAM-A coil driver units delivered | 25 HAM-A coil driver units
were fabricated by Todd and I've transported
them to the 40m. |
|
|
16349
|
Mon Sep 20 20:43:38 2021 |
Tega | Update | Electronics | Sat Amp modifications | Running update of Sat Amp modification
work, which involves the following procedure (x8)
per unit: |
|
|
16356
|
Wed Sep 22 17:22:59 2021 |
Tega | Update | Electronics | Sat Amp modifications | [Koji, Tega]
Decided to do a quick check of |
|
|
16357
|
Thu Sep 23 14:17:44 2021 |
Tega | Update | Electronics | Sat Amp modifications debugging update | Debugging complete.
All units now have the correct
TP4 voltage reading needed to drive a |
|
|
16377
|
Mon Oct 4 18:35:12 2021 |
Paco | Update | Electronics | Satellite amp box adapters | [Paco]
I have finished assembling the
1U adapters from 8 to 5 DB9 conn. for the |
|
|
16378
|
Mon Oct 4 20:46:08 2021 |
Koji | Update | Electronics | Satellite amp box adapters | Thanks. 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 |
Tega | Update | Electronics | Sat Amp modifications | Trying 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 |
Koji | Update | Electronics | Sat Amp modifications | Make 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 |
Tega | Update | Electronics | Sat Amp modifications | [Tega, Koji]
(S2100737) - Debugging showed
that the opamp, AD822ARZ, for PD2 circuit |
|
|
16387
|
Thu Oct 7 02:04:19 2021 |
Koji | Update | Electronics | Satellite amp adapter chassis | The 4 units of Satellite Amp Adapter were
done:
- The ears were fixed with the screws |
|
|
16411
|
Mon Oct 18 16:48:32 2021 |
Tega | Update | Electronics | Sat Amp modifications | [S2100738, S2100745, S2100751] Completed
three more Sat Amp units modification with
seven remaining. |
|
|
16427
|
Tue Oct 26 13:27:07 2021 |
Tega | Summary | Electronics | Sat Amp modification Summary | Modifications and testing of SatAmp
units COMPLETE. Attachments 1 & 2 show
all 19 units, one installed unit and the |
|
|
16428
|
Tue Oct 26 14:53:24 2021 |
Koji | Update | Electronics | Rack | 1. 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 |
|
|
16436
|
Wed Oct 27 19:34:52 2021 |
Koji | Summary | Electronics | New electronics racks | 1. The rack we cleaned today (came from
West Bridge) will be placed between 1X3 and
1X4, right next to 1X4 (after removing the |
|
|
16513
|
Thu Dec 16 15:04:12 2021 |
Chub | Update | Electronics | ITMX feedthroughs and in-vac cables installed | The ITMX 10" flange with four DSUB-25
feedthroughs has been install with the cables
connected at the in-vac side. See photo; |
|
|
16515
|
Thu Dec 16 15:54:08 2021 |
Koji | Update | Electronics | ITMX feedthroughs and in-vac cables installed | Thanks for the installation.
With regard to the connector convention,
let's use the attached arrangement so |
|