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-1526 Instrument control development <p>[ I thought I had filed this earlier but apparently not. ]</p> <p>The LBNL wipe routine is believed to ameliorate the tearing seen in <a href="https://pfspipe.ipmu.jp/jira/browse/INSTRM-7" title="CCD flats show regions of vertical structure from top of detector" class="issue-link" data-issue-key="INSTRM-7"><del>INSTRM-7</del></a>. We have a been using an external loop which is slow. Implement an internal routine instead. Specifically:</p> <ul class="alternate" type="square"> <li>Push parallels up to some newly specified voltage</li> <li>Ramp Vbb down to zero volts at a specified rate</li> <li>Dwell for 0.5 seconds</li> <li>Ramp Vbb back up to its original voltage at the same rate</li> <li>When Vbb reaches a defined threshold, drop the parallels to their original value</li> <li>Continue ramping Vbb</li> </ul> <p>So command like:</p> <p><tt>~SEQ,<span class="error">&#91;ramp_time_ms&#93;</span>,<span class="error">&#91;threshold&#93;</span>,<span class="error">&#91;parallel voltage&#93;</span></tt></p> INSTRM-1526

Implement internal FEE routine for LBNL wipe

Task Normal Done Done shope cloomis SPS Wed, 23 Feb 2022 14:20:29 +0000 Wed, 27 Apr 2022 15:49:52 +0000 Wed, 27 Apr 2022 15:49:52 +0000 ics_xcu_fee 0 1 <p>Implemented in Firmware Rev: 220211-01</p> <p>Adds the following command:</p> <p>rSeq,<span class="error">&#91;new parallel voltage&#93;</span>,<span class="error">&#91;Vthreshold to revert Parallels&#93;</span>,<span class="error">&#91;number of ~5ms steps to ramp Vbb&#93;</span>,<span class="error">&#91;Vbb dwell time in ms at 0V&#93;</span>\n</p> <p>Example:</p> <p>rSeq,8,8,100,1000\n<br/> rSeq: Run Sequence<br/> 8: Set Parallels to 8V (this is an ascii float value)<br/> 8: Set the Vbb positive Ramp threshold for reverting parallels to 8V (this is an ascii float)<br/> 100: Set the number of ramp steps to 100, which approximates to 500ms (this is an ascii int)<br/> 1000: Set the Dwell time to 1000, which approximates to 1000ms (this is an ascii int)<br/> \n: Execute the command.</p> <p>And it turns out that <b>all</b> of this might have been unnecessary. The VBB circuit had a diode which was blocking some part of the charging, and so VBB was taking a very long time to drop to 0V. So it may well be that the only thing I was doing was inserting a very long time while VBB was going from 30V to 0V. In any case we have a new knob.</p> <p>Needs burning and testing.</p> <p>We are calling this and it evidently works.</p> Relates INSTRM-1556 INSTRM-7 Development Rank 0|zzst5b: Reviewers cloomis