R1S5 SL2 BurnIn

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Date Time (24h) Guard (V) Sense (V) Field (V) Sense ([math]\mu[/math]A) Field ([math]\mu[/math]A) comments
05/28/13 14:08 100 100 -100 0.02 0.00 Confirmed with initial setting of 30/40/50V that there are no crossed connections between wire types and that voltage supply is connected correctly.
05/28/13 16:34 536 1500 -750 45.5 45.5 Someone upped the voltage to full the full operating level without recording it. This is the current reading right now.
05/28/13 17:56 536 1500 -750 41.5 41.6
05/29/13 07:56 536 1500 -750 22.5 22.6
05/29/13 15:02 536 1500 -750 17.9 18.0
05/29/13 18:07 536 1500 -750 16.7 16.8
05/30/13 07:55 536 1500 -750 10.6 10.7
05/30/13 12:51 536 1500 -750 9.5 9.6
05/30/13 17:23 536 1500 -750 8.7 8.8
06/03/13 08:23 536 1500 -750 1.7 1.8
06/04/13 07:42 536 1500 -750 1.4 1.5
06/05/13 12:01 536 1500 -750 1.8 1.9 had to turn off HV to organize cables
06/05/13 17:56 536 1500 -750 1.8 1.9
06/06/13 07:56 536 1500 -750 1.8 1.9 seem to be stuck at this current draw?
06/10/13 17:29 536 1500 -750 1.5 1.6 I think we ran out of gas on the weekend, the windows were deflated a bit but now they deflected outward
06/11/13 07:50 536 1500 -750 3.2 3.3 current doubles? Humidity dropped from 40 to 25%.
06/12/13 13:39 536 1500 -750 3.6 3.7 Humidity rose from 25 to 40%.
06/13/13 11:00 536 1500 -750 4.5 4.6 Humidity is 40 +/- 5 %.
06/14/13 08:56 536 1500 -750 3.5 3.6
06/17/13 07:58 536 1500 -750 3.6 3.7
06/24/13 08:37 536 1500 -750 4.5 4.6 turned off HV since 6/17/13 but continued flowing gas
06/24/13 10:05 536 1500 -750 5.14 5.24
06/24/13 12:46 536 1500 -750 5.10 4.99
06/25/13 10:36 536 1500 -750 4.7 4.7

Why is the current increasing?

is the current going to ground ?

Try raising the sense to 1750 and lowering the field to 500 (same voltage difference), and see if the sense current still equals the field current - want to know if the current is inside the chamber from wire to wire or if it's a current to ground, for example ...

If current is from field to sense:

if it is current from field to sense the current should increase exponentially with voltage, doubling with 100V increase; i.e. 2250 -> 2350. You could check to see if this is the case. If so, you could then try to locate where the problem is: which wire(s) are responsible?

Increasing Sense

Date Time (24h) Guard (V) Sense (V) Field (V) Sense ([math]\mu[/math]A) Field ([math]\mu[/math]A) comments
06/17/13 12:20 536 1510 -750 8 8.1
06/17/13 12:16 536 1520 -750 10.7 10.8
06/17/13 12:34 536 1530 -750 22.3 22.4
06/17/13 12:43 536 1540 -750 37.3 37.4
06/17/13 15:53 536 1540 -750 45.2 45.3
06/17/13 15:55 536 1550 -750 54.9 55.1

Lower the field to -500 V

Date Time (24h) Guard (V) Sense (V) Field (V) Sense ([math]\mu[/math]A) Field ([math]\mu[/math]A) comments
06/17/13 15:55 536 1550 -750 54.9 55.1
06/17/13 15:58 536 1550 -740 45.9 46.1
06/17/13 15:59 536 1550 -730 37.6 37.9
06/17/13 14:00 536 1550 -710 24.2 24.3
06/17/13 14:02 536 1550 -690 13.9 14.0
06/17/13 14:03 536 1550 -650 3.8 3.9
06/17/13 14:04 536 1550 -600 1.33 1.41
06/17/13 14:05 536 1550 -550 0.88 0.97
06/17/13 14:06 536 1550 -500 0.66 0.74

Increase sense when Field is at -500 V

Date Time (24h) Guard (V) Sense (V) Field (V) Sense ([math]\mu[/math]A) Field ([math]\mu[/math]A) comments
06/17/13 14:06 536 1550 -500 0.66 0.74
06/17/13 14:10 536 1650 -500 1.5 1.6
06/17/13 14:13 536 1750 -500 16.2 16.3

SL2 current draw search

Date Time (24h) Guard (V) Sense (V) Field (V) Sense ([math]\mu[/math]A) Field ([math]\mu[/math]A) comments
06/18/13 08:57 536 1550 -550 0.59 0.69 no voltage to HVB1
06/18/13 09:00 536 1550 -500 0.46 0.55 no voltage to HVB1
06/18/13 09:12 536 1650 -500 1.1 1.2 no voltage to HVB1
06/18/13 09:17 536 1750 -500 9.5 9.6 no voltage to HVB1, less current measured
06/18/13 10:31 536 1550 -500 0.32 0.42 no voltage to HVB1 and HVB2
06/18/13 10:40 536 1650 -500 1.0 1.1 no voltage to HVB1 and HVB2
06/18/13 10:45 536 1750 -500 8.8 8.9 no voltage to HVB1 and HVB2
06/18/13 11:07 536 1550 -500 0.32 0.42 no voltage to HVB1 and HVB3
06/18/13 11:11 536 1650 -500 1.0 1.1 no voltage to HVB1 and HVB3
06/18/13 11:16 536 1750 -500 6.8 6.9 no voltage to HVB1 and HVB3
06/18/13 11:31 536 1550 -500 0.34 0.43 no voltage to HVB1,HVB3,and HVB4
06/18/13 11:34 536 1650 -500 0.82 0.92 no voltage to HVB1,HVB3,and HVB4
06/18/13 11:38 536 1750 -500 5.0 5.1 no voltage to HVB1,HVB3,and HVB4 negligible effect
06/18/13 12:12 536 1550 -500 0.34 0.42 no voltage to HVB1,HVB3,and HVB5
06/18/13 12:15 536 1650 -500 0.89 0.97 no voltage to HVB1,HVB3,and HVB5
06/18/13 12:19 536 1750 -500 4.9 5.0 no voltage to HVB1,HVB3,and HVB5 negligible effect
06/18/13 14:08 536 1550 -500 0.0 0.055 no voltage to HVB1,HVB3,and HVB6
06/18/13 14:24 536 1650 -500 0.2 0.27 no voltage to HVB1,HVB3,and HVB6
06/18/13 14:30 536 1750 -500 4.5 4.6 no voltage to HVB1,HVB3,and HVB6
06/18/13 14.50 536 1550 -500 0.335 0.420 no voltage to HVB1,HVB3,and HVB7
06/18/13 14:53 536 1650 -500 0.965 1.035 no voltage to HVB1,HVB3,and HVB7
06/18/13 15:00 536 1750 -500 5.2 5.3 no voltage to HVB1,HVB3,and HVB7
06/26/13 17:37 536 1500 -750 4.6 4.3 Switched to SL2 Kraken HV after burning in SL1 HVB1 with Octopus. SL1 HVB1 burned down to about 1 microamp over ~24 hrs after starting at a high of 4 microamps. When setting up HVB1 for burn-in, noticed a grounding strap attached to the board that caused high guard current even at 30V. Removed the strap and this problem was resolved, burn-in proceeded normally. This is the reading on SL2 + Kraken immediately after reaching 1500V on sense.
06/26/13 17:41 536 1500 -750 5.7 5.3 Guard current is at 0.295 microamps. Normally is below a level detectable by this HV supply (0.000).
06/26/13 17:55 536 1500 -750 5.3 5.0 Noticed several of the mounting screws that go into the chamber's metal frame for both STBs and HVBs on SL2 were not torqued to 13 in. lbs / some were obviously loose. Turned off HV and torqued down all mounting screws. Some do not appear flush against STB/HVB surface, but most are flush. Turned back on HV. Guard current is still 0.280 microamps. Torquing screws didn't fix it.
06/27/13 17:25 536 1500 -750 2.8 2.7 Guard current is down to 0.045


Sense Field difference constant

Change sense and field wire voltage but keep the difference 2350 Volts. Record currents over a time interval of minutes. Don't wait long.

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