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Vicor Noise Test Results Ver. 7.0

This document provides the hardware and software setup for the noise test, including the earth grounding scheme utilized. It also includes test results with both linear and Vicor supplies, and concludes that there is no significant difference between the two.

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Vicor Noise Test Results Ver. 7.0

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  1. Vicor Noise Test Results Ver. 7.0 • Noise test hardware & software setup. • Earth grounding scheme utilized for noise tests. • Block diagram of earth & signal grounds. • UofI Monsoon test stand wiring scheme. • Test results with linear supplies. • Test results with Vicor supplies. • Conclusion… Todd Moore for the DES Collaboration Nov 27, 2006

  2. Noise Test Hardware Setup • All test are run with either Linear supplies or Vicor supplies attached to original Monsoon 6-slot DHE. • Remote sensing was removed & local sensing added. • Noise measurements are taken with video inputs: shorted, floating, & connected to ccd emulator thru video cable supplied by Fermilab. • The Vicor +3.3vdc voltage is running without uRAM. Todd Moore for the DES Collaboration Nov 27, 2006

  3. Noise Test Software Setup • All exposures are long.Monsoon is running Fermilab focalplane on cyclone:/home/monsoon/cfg/_fnal/. • Sequencer for 6-slot readout is ReadType1d.ucd. • All exposures are long. • # of pixels for long exposure is 4146 (4096+50) rows X 2248 (2048+100) columns. • Readout time is at 11uS/pixel. • All Offsets are set to 1.0v. • Channel 0 & 2 video inputs are used for readout. • All datasets are located on cyclone.hep.uiuc.edu:/home/monsoon/data/vicor_noisetest/…. • Data is analyzed for a long run using ./noiselast_wrows.sh. • Data is analyzed visually using DS9 or FV4.2. Todd Moore for the DES Collaboration Nov 27, 2006

  4. UofI Earth Grounding Scheme NOTES: • CCD TEST RACK CONNECTS TO EARTH GROUND THRU POWER STRIP GOING TO OUTLET & PROVIDES ONE POINT FOR EARTH GROUND REFERENCE. • ON LINEAR SUPPLIES, ALL ANALOG & DIGITAL RETURNS ARE TIED TOGETHER AT THE SUPPLY & AT THE MONSOON BACKPLANE. • ON VICOR SUPPLIES, ANALOG RETURNS ARE TIED TOGETHER AT THE SUPPLY; DIGITAL RETURNS ARE TIED TOGHETHER AT THE SUPPLY, AND BOTH ANALOG & DIGIAL RETURNS ARE TIED TOGETHER AT THE MONSOON BACKPLANE. • THE ANALOG & DIGITAL RETURNS ARE CONNECTED FROM THE MONSOON BACKPLANE TO THE TEST RACK TO TIE EARTH GROUNDS AND SIGNAL GROUNDS TOGETHER. • THE +/-15VA, +/-5VA, +5VD, & +3.3VD LINEAR SUPPLY CASE IS @ EARTH GROUND, WHILE VOLTAGE OUPUTS ARE ISOLATED. • THE -28VA SUPPLY CASE & VOLTAGE OUTPUTS ARE ISOLATED. ISOLATED EARTH GROUND BANANNA PLUG FROM SUPPLY IS CONNECTED TO TEST RACK TO TIE -28V SUPPLY EARTH GROUND INTO SYSTEM. • VICOR POWER SUPPLY CASE IS @ EARTH GROUND WHILE VOLTAGE OUTPUTS ARE ISOLATED. • GROUNDING STRAP CONNECTS VICOR CASE TO RACK TO BRING SIGNAL & EARTH GROUNDS TOGETHER. Todd Moore for the DES Collaboration Nov 27, 2006

  5. UofI CCD Test Stand Grounding Scheme Monsoon Case(Floating) Linear Supply: +/-15VA, +/-5VA, +5VD, & +3.3VD Metal Rack EGND EGND Note 5: Digital & Analog Voltage Returns Note 3: AGND & DGND Planes Monsoon Backplane Linear Supply -28VA EGND Note 4: Vicor supply (Case @ Earth GND) EGND Digital & Analog Voltage Returns Note 2: Fan Panels EGND Note 3: Note 1: NOTES: RACK IS THE SINGLE POINT FOR EARTH GNDS 1. Rack is single point for all Earth Grounds, all AC Power (+ Egnd) comes from single power strip mounted on rack. 2. Vicor Case, which is fed Egnd from A/C plug, is attached to Rack with grounding strap. 3. Linear Case is mounted to Rack & thus is @ Earth Ground. 4. Linear Case is floating, Egnd from A/C plug attached to rack with grounding strap. 5. Monsoon Case floating, backplane gnds are attached to rack, which is @ Egnd. EGND Block Diagram Of Grounding Scheme Todd Moore for the DES Collaboration Nov 27, 2006

  6. UofI Monsoon Test StandWiring Scheme Todd Moore for the DES Collaboration Nov 27, 2006

  7. Linear Supply Test Results Todd Moore for the DES Collaboration Nov 27, 2006

  8. Linear Supply Plot Results Test 3, Nov 7, 2006 Todd Moore for the DES Collaboration Nov 27, 2006

  9. Linear Supply Plot Results Test 4, Nov 7, 2006 Todd Moore for the DES Collaboration Nov 27, 2006

  10. Linear Supply Plot Results Test 5, Nov 7, 2006 Todd Moore for the DES Collaboration Nov 27, 2006

  11. Linear Supply Plot Results Test 6, Nov 7, 2006 Todd Moore for the DES Collaboration Nov 27, 2006

  12. Linear Supply Plot Results Test 7, Nov 7, 2006 Todd Moore for the DES Collaboration Nov 27, 2006

  13. Vicor Supply Test Results Todd Moore for the DES Collaboration Nov 27, 2006

  14. Vicor Supply Plot Results Test 13, Nov 21, 2006 Todd Moore for the DES Collaboration Nov 27, 2006

  15. Vicor Supply Plot Results Test 14, Nov 21, 2006 Todd Moore for the DES Collaboration Nov 27, 2006

  16. Vicor Supply Plot Results Test 15, Nov 21, 2006 Todd Moore for the DES Collaboration Nov 27, 2006

  17. Conclusion… • Baseline measurements for linear & Vicor supplies are in-line with previous measurements. IE. Monsoon system is functioning normally. • Adding FNAL video cable + ccd emulator caused the sigma to go up to ~25 counts RMS for both linear & Vicor supply. IE. No real difference between linear or VIcor supplies attached to Monsoon system. • I don’t see the same large numbers of sigma as seen at FNAL. • Ground scheme may be different than FNAL…May need to re-run some tests with different grounding scheme. Todd Moore for the DES Collaboration Nov 27, 2006

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