|
40m
QIL
Cryo_Lab
CTN
SUS_Lab
CAML
OMC_Lab
CRIME_Lab
FEA
ENG_Labs
OptContFac
Mariner
WBEEShop
|
| 40m Log |
Not logged in |
 |
|
|
 Mon Mar 2 16:29:40 2020, gautam, Update, Electronics, c1psl VME crate removed, Acro-crate installed 
|
 Tue Mar 3 17:20:14 2020, gautam, Update, Electronics, More cabling removed
| |
Wed Mar 4 16:18:31 2020, gautam, Update, Electronics, More cabling removed
| |
Wed Mar 4 21:02:49 2020, Koji, Update, Electronics, More cabling removed
| |
Tue Mar 3 17:59:33 2020, Yehonathan, Update, Electronics, PSL Shutter and PMC TRANSPD working
| |
Thu Mar 5 15:03:48 2020, Yehonathan, Update, Electronics, PSL Shutter and PMC TRANSPD working
| |
Thu Mar 5 19:45:23 2020, Jon, Summary, PSL, C1PSL in-situ test results
| |
Wed Mar 11 18:12:53 2020, gautam, Summary, PSL, WFS Demod board modifications
|
|
|
Message ID: 15256
Entry time: Thu Mar 5 19:45:23 2020
In reply to: 15255
Reply to this: 15266
|
| Author: |
Jon |
| Type: |
Summary |
| Category: |
PSL |
| Subject: |
C1PSL in-situ test results |
|
|
We've completed almost all of the in-situ testing of the c1psl channels. During this process, we identified several channels which needed to be rewired to different Acromags (BIO sinking v. sourcing). We also elected to change the connector type of a few channels for practical advantages. Those modifications and other issues found during testing are detailed below. Also attached are the updated channel assignments, with a column indicating the in-situ testing status of each channel.
Post-installation modifications
- All four channels connected to the sourcing BIO module were found to in fact require sinking I/O. They were reassigned to sinking BIO modules. Affected channels:
- C1:PSL-FSS_FASTSWEEP
- C1:PSL-FSS_SW1
- C1:PSL-FSS_SW2
- C1:PSL-PSL_Shutter
- Added a new AI channel:
- Removed an unneccessary AI channel:
- Moved two AI channels from BNC connectors to a new Dsub connector (labelled DB25M-2 in the spreadsheet).
- C1:PSL-FSS_RCTEMP
- C1:PSL-FSS_RMTEMP_VOLTS
Issues identified during testing
- Digital calibration. The following channels work, but we need to verify their EPICS calibration parameters (EGUF/EGUL):
- C1:PSL-FSS_FASTGAIN
- C1:PSL-FSS_FAST
- C1:PSL-PMC_RFADJ
- C1:PSL-PMC_MODET
- IMC servo board. The Acromag channels themselves were found to work, but the linearity of the mbbo gain stages are in question (i.e., a potential problem with the board). GV is currently testing the servo board.
- PSL QPD board apears to be dead. We connected a scope directly to the test points on the board and measured a high level of noise and no signal (for all four of the QPD channels). I understand this QPD has not been used in some time, so it may not have been noticed before.
- WFS DC channels are saturating when the IMC is unlocked. The acceptance range of the Acromag ADC is only +/-10 V, but we measured sensor voltages as high as ~14 V. It appears that the old ADCs were somehow accepting a range of 0 to +20 V instead of -10 to +10 V. However, the Acromags do not support the input range 0-20 V. Since SNR is not critical for these channels (they're used only for initial alignment), I propose we simply install a voltage divider inside the chassis, just before the Acromag, for each of these signals.
|
|