https://pfspipe.ipmu.jp/jira This file is an XML representation of an issue en-us 8.3.4 803005 13-09-2019 https://pfspipe.ipmu.jp/jira/browse/INSTRM-610 Instrument control development <p>Wire temperature readings into heater loop.</p> INSTRM-610

Wire in heater PID loop

Task Normal Done Done cloomis cloomis SPS Tue, 12 Feb 2019 21:06:10 +0000 Tue, 26 Jan 2021 15:19:39 +0000 Thu, 21 Jan 2021 20:44:43 +0000 ics_xcu_smb 0 2 <p>Expect to fix this by end of next week.</p> <p>A 1 week delay in completing this.</p> <p>Original plan is to test this on N1 which is available at JHU, but Fabrice has offered to provide R2 for testing at LAM early next week. R2 can remain 1-5 days cold during that period.</p> <p>PID loop control useful at Subaru due to sensitivity of focus with temperature. If within temp 1K focus is acceptable.</p> <p>Craig to still do this on N1.</p> <p>Will run on b9 first; Josh is installing a resistor on the heater circuit and a temperature sensor to read that.</p> <p>Josh completed the installation yesterday.</p> <p>This looks pretty good, so I'll clean up and close this ticket. See attached, showing <em>all</em> updates taken over 11 hours or so with both the ASIC and H4 loops running on n1. <br/> The ASIC needs ~20K of heat to run reliably (at 130K); the H4 is being lifted by only 1.5K or so.</p> <p>I will open a couple of tickets, though. The DAC sporadically stops responding correctly &#8211; once Saturday, once Sunday, not yet today. A reconnect/reset often fixes the problem, but not always. The code is not well structured to explore these kinds of problems. It does seem to fail very gracefully: just leaving the requested current active, and ignoring updates. Has happened on b9, so I can work there.</p> <p>I am not protecting against windup correctly. Close, but not quite.</p> <p>Also, the ASIC loop could use a bit of tuning. We would like more P to quickly counter the huge and instant effects of bouncing power on the ASIC, etc, but we are close to oscillations and we do not like the 5K/s+ rates we can swing on the ASIC.</p> <p>Merged at 4653fe3, tagged 1.3.0. </p> <p>Basic functionality added. Runs both ASIC and H4 loops to &lt;1 mK RMS. Has been run on several IDG FPAs.</p> <p>Will open tickets for additional bugs and features.</p> Duplicate INSTRM-599 Relates INSTRM-1152 Development Rank 0|zzs313:zzw8i Sprint 2019 C SM1PD-2020 C SM1PD-2020 K SM1PD-2020 J SM1PD-2020 M SM1PD-2020 L SM1PD-2020 N Story Points 1.0