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40m Log |
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Thu Sep 29 20:21:29 2016, Johannes, Update, General, YARM loss measurement
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Mon Oct 3 21:24:02 2016, Johannes, Update, General, XARM loss measurement
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Tue Oct 4 22:18:24 2016, Johannes, Update, General, X/YARM loss measurement
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Wed Oct 5 19:10:04 2016, gautam, Update, General, Arm loss measurement review
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Mon Nov 14 19:15:57 2016, Johannes, Update, General, Achievable armloss measurement accuracy
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Tue Nov 15 20:35:19 2016, Johannes, Update, General, Achievable armloss measurement accuracy
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Thu Nov 17 21:54:11 2016, Johannes, Update, General, Achievable armloss measurement accuracy
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Thu Jan 12 02:45:53 2017, Johannes, Update, General, Next armloss steps
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Fri Jan 13 08:54:32 2017, Johannes, Update, General, DC PD installed  
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Message ID: 12624
Entry time: Thu Nov 17 21:54:11 2016
In reply to: 12618
Reply to this: 12704
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Author: |
Johannes |
Type: |
Update |
Category: |
General |
Subject: |
Achievable armloss measurement accuracy |
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I don't like AS110 or AS55. Neither of them are designed for DC and so the DC readout chain is hokey. How about use an actual transimpedance PD with a 100-1000 Ohm resistor and a 3 mm diode? This would eliminate the alignment sensitivity and the drifts due to electronics and room lights.
This looks much better. I'm planning to take more data with the AS110 PD rather than AS55 when I get the chance, increase the averaging time, and also sigma filter the datapoints. That should get us to a good spot and cut down the uncertainty even further.
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