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#320 by Zachstar on 15 Jun, 2007 04:06
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WOAH! The meter is moving all over the place.
The graph is going off the charts!
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#321 by JWag on 15 Jun, 2007 04:06
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Now they're checking DC current. I guess if anyone can make an accurate clamp-on DC ammeter it would be Fluke.
Edit: Wait-- I could have sworn I saw an image with "DCmA" in it. :frown:
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#322 by j2_ on 15 Jun, 2007 04:07
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The dialog on NASA TV is fascinating right now. Thanks for the coverage Zachstar, capturing it very well.
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#323 by iloco on 15 Jun, 2007 04:09
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I thought the "we're all denying we're electrical engineers up here". I'm no electrician, but that waveform looked weird for sure.
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#324 by rdale on 15 Jun, 2007 04:09
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Zachstar - 14/6/2007 12:06 AM
WOAH! The meter is moving all over the place.
The graph is going off the charts!
Does that signify anything? -
#325 by Zachstar on 15 Jun, 2007 04:12
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Options because its past crew sleep.
Go to sleep now. (But they really need data for troubleshoot)
Rotate to starboard side and do the demate cable.
Do the full data collection.
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Suni wants to close this rack and talk to the guys first. -
#326 by jimvela on 15 Jun, 2007 04:17
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Quote
and I haven't had success with this approach. Problems like this for me have always come down to a problem with grounding and shielding - ground loops, multiple grounds at different voltages, open shields, shields with multiple tie points etc. I'll often do this sort of test with a hall-effect current probe on a ground, but not on a main cable unless I suspect a common-mode problem of some sort (rare).
We have a clued in participant! I wholeheartedly agree.
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#327 by jmjawors on 15 Jun, 2007 04:17
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MondoMor - 14/6/2007 11:06 PM
Wait-- I could have sworn I saw an image with "DCmA" in it. :frown:
What would that signify to you? I'm clueless. -
#328 by jimvela on 15 Jun, 2007 04:18
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jmjawors - 14/6/2007 10:17 PM
QuoteMondoMor - 14/6/2007 11:06 PM
Wait-- I could have sworn I saw an image with "DCmA" in it. :frown:
What would that signify to you? I'm clueless.
DC Current.
DC= Direct current
mA= Milliamp range.
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#329 by JWag on 15 Jun, 2007 04:20
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Lee Jay - 14/6/2007 11:04 PM Unless they're monitoring ground current, I would think looking at currents would be totally misleading unless they suspect the loads (computers) ...
About the only thing I can come up with is that they may be comparing what they're seeing on the station to a setup on the ground, and looking for differences
There's probably a schematic on L2 somewhere.
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#330 by jmjawors on 15 Jun, 2007 04:20
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Quote
jimvela - 14/6/2007 11:18 PM
Quotejmjawors - 14/6/2007 10:17 PM
QuoteMondoMor - 14/6/2007 11:06 PM
Wait-- I could have sworn I saw an image with "DCmA" in it. :frown:
What would that signify to you? I'm clueless.
DC Current.
DC= Direct current
mA= Milliamp range.
Ok... but why the frown? That was really the crux of the question. -
#331 by Zachstar on 15 Jun, 2007 04:22
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Its backwards Suni
Thats better!
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#332 by Zachstar on 15 Jun, 2007 04:24
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Cable 2
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#333 by JWag on 15 Jun, 2007 04:25
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jmjawors - 14/6/2007 11:20 PM Ok... but why the frown? That was really the crux of the question.
I'm worried about my sanity, hence the frown. I might have seen something that wasn't actually there.
I can't make heads nor tails of what they're measuring nor what it might mean. If this was a car or some Earth-side electrical system, I could probably fake it.
Lee and jimvela are much more clued-in.
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#334 by JimO on 15 Jun, 2007 04:25
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bsegal - 14/6/2007 9:31 PM
20 bucks if you can come up with a Wayne Hale pic circa that timeperiod with a full head of hair.
Bergin has my mailing address.
http://www.jamesoberg.com/image/tony_ceccacci-gary_coen-way.jpg
Gary Coen was Ascent Prop for STS-1 (this pix), later Flight Director
Tony Ceccacci was a trainee -- later Flight Director, now big ISS wheel.
I took the picture.
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#335 by gruff68 on 15 Jun, 2007 04:25
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I'm no electrical engineer either, but what is looking at fluxuation in current draw going to prove?
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#336 by Zachstar on 15 Jun, 2007 04:28
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4.10 whatever that means.
Suni reports the battery is getting pretty used and it blacked out once.
Edit: & Again
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#337 by Zachstar on 15 Jun, 2007 04:30
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Scope going off all the time.
Cable 1
Batteries seem almost dead...
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#338 by jmjawors on 15 Jun, 2007 04:32
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MondoMor - 14/6/2007 11:25 PM
Quotejmjawors - 14/6/2007 11:20 PM Ok... but why the frown? That was really the crux of the question.
I'm worried about my sanity, hence the frown. I might have seen something that wasn't actually there.
I can't make heads nor tails of what they're measuring nor what it might mean. If this was a car or some Earth-side electrical system, I could probably fake it.
Lee and jimvela are much more clued-in.
Ok. Just wondered if I was missing some other significance.QuoteJimO - 14/6/2007 11:25 PM
Quotebsegal - 14/6/2007 9:31 PM
20 bucks if you can come up with a Wayne Hale pic circa that timeperiod with a full head of hair.
Bergin has my mailing address.
http://www.jamesoberg.com/image/tony_ceccacci-gary_coen-way.jpg
Gary Coen was Ascent Prop for STS-1 (this pix), later Flight Director
Tony Ceccacci was a trainee -- later Flight Director, now big ISS wheel.
I took the picture.
Hah! Time for someone to pay up! -
#339 by Zachstar on 15 Jun, 2007 04:32
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No need for the scope anymore.
Cable demate time!
Sunrise!
Edit: Wait-- I could have sworn I saw an image with "DCmA" in it. :frown: 