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 Fri Jun 26 16:53:38 2020, gautam, Update, Electronics, RFPD characterization 
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 Mon Jun 29 15:56:02 2020, gautam, Update, Electronics, RFPD characterization
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Sun Jul 5 18:25:42 2020, rana, Update, Electronics, WFS characterization
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Sun Jul 12 22:40:35 2020, gautam, Update, Electronics, WFS characterization - old SURF report
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Sat Aug 29 20:07:48 2020, rana, Update, Electronics, WFS characterization
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Sat Aug 29 22:10:09 2020, gautam, Update, Electronics, WFS characterization
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Tue Sep 15 17:04:43 2020, gautam, Update, Electronics, DC adaptors delivered
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Message ID: 15450
Entry time: Sun Jul 5 18:25:42 2020
In reply to: 15433
Reply to this: 15472
15547
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| Author: |
rana |
| Type: |
Update |
| Category: |
Electronics |
| Subject: |
WFS characterization |
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in the lab, checkin on the WFS
Sun Jul 5 18:25:50 2020
I redid Gautam's measurements to get a baseline before changing the head, and my results are very different: To me it looks like the WFS2 quadrants are all OK.
Measurement Details:
- The whole AG4395 + breadboard Jenne laser is wheeled over next to the SW side of the AP table.
- The output of the 1611 goes into channel R of the 4395
- I disconnected all the LEMO cables from the head and then plugged a LEMO-BNC cable into the plugs one at a time. The existing LEMO connectors, which take the signals back to the demode board, were all a little loose, so I adjusted them with some pliers (see video).
- The Atten = 0 dB for all AG4395 channels
- Source drive = 0 dBm. Checked with a -10 dBm drive that there was no change in the observed TFs, so I guess a 0 dBm drive doesn't make things nonlinear.
- When I first turned the setup on, the Yellow 'limit' light was ON on the ILX laser current driver, so maybe the modulation wasn't getting to the laser diode as we wish.
- did not change any WFS MEDM settings for these measurements. Not sure if any of those buttons work anyway.
I've left the setup as is in case either me or Gautam want to double check. If we're agreed on this response, I'll remove the notches and disable the RF attenuators.
Sun Jul 5 21:42:45 2020 |
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