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UKDC2

UKDC2. Stavelet with Tandem Converters Peter W Phillips. Gratuitous Photograph. Note “suction cup” marks Does not affect IVs Is this an issue?. 18/12 3PG @1fC, 200V, H0 AC strip bias. 18/12 same H1 only. 18/12 same H0 only. 18/12 same H0 now DC strip bias. H1. H0. Try some things!.

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UKDC2

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  1. UKDC2 Stavelet with Tandem Converters Peter W Phillips

  2. Gratuitous Photograph • Note “suction cup” marks • Does not affect IVs • Is this an issue?

  3. 18/12 3PG @1fC, 200V, H0 AC strip bias 18/12 same H1 only 18/12 same H0 only 18/12 same H0 now DC strip bias

  4. H1 H0 Try some things! • 2440-3 Add Cu shunt to H1 converter output • H0 gnd rise 23mV • H1 gnd rise was 40mV, now 5mV • No significant change • 2440-12 Pull H1 M shunt bonds • No significant change • 2440-15 Remove BCC edge referencing bonds • Eliminate possible I loop • No significant change • 2442-1 Pull H0 backplane contact • Actually lift soldered wire • H0 Rbpc ~100ohm -> open • H1 Rbpc ~20 ohm • H0 slightly worse • H1 much better (see over)

  5. Pull BCC edge reference Bonds @ H1 edge 1 backplane contact @ H1 only GND shunt added to H1 converter Pull M shunt bonds On hybrid H1

  6. H1 H0 Try more things! • 2442-4 Put H0 backplane contact back • AC only (5k1 pulled) • H0 slightly better • H1 slightly worse • 2442-7 Reduce H0 Rbpc to 1 ohm • AC only • H0 no significant change • H1 MUCH worse • 2442-10 Add third backplane contact • AC only • H0 MUCH worse • H1 slightly better • 2443-2 Remove third backplane contact & • Refit 5k1 resistor (actually 4k99) • So now DC • Similar to (2) above Cu tape stuffed under sensor & soldered to existing contact Cu tape stuffed under sensor, soldered to 10uF HV cap and thence to H1 GND

  7. 2 backplane contacts 2 x DC (1ohm, 17 ohm) 2 backplane contacts 1 x AC (100ohm), 1 x DC 2 backplane contacts 1 x AC (1ohm), 1 x DC 3 backplane contacts 2 x AC, 1x DC

  8. 20/12 3PG @1fC, 200V, 20/12 same H1 only 20/12 same H0 only Single Backplane Contact @ H1

  9. What’s going on? • The HV filter cap on each hybrid bypasses the sensor backplane to the local ground • A single contact typically works better than 1 • Suggests GND on the two hybrids are not sufficiently similar • After this • Referencing bonds at H1 BCC edge were restored • Referencing ties improved a little • Set for single backplane connection (@H1)

  10. What next? DC-DC Fan Club

  11. DC-DC Fan Club All columns go up when fans turned off, and back down when fans turned on. -> consistent with expected dENC/degree given accuracy of temp data?

  12. What Next • New chiller order in progress with Positive Displacement pump • Should eliminate dT between pipes • Should allow slightly lower temperature operation too • One Wire T sensors in hand for extra T measurements • DC-DC converter temperatures • Can we get hold of two single DC-DC units? • Either • add module with separate converters, then upgrade to tandem for direct comparison with same hookup • OR • Remove existing tandem and service existing module with two single converters

  13. BACKUP

  14. SINGLE MODULE REFERENCE DATA UKDC2 has been fitted with module LIV 8 This is the single module test result (SP) taken before assembly Note that high current / noise bumps develop in H1 above 190V So all runs taken at 190V after training

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