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Tweakers' Asylum Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ. |
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Tweakers' Asylum Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ. |
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In Reply to: That's nice to know! posted by Redwing on January 31, 2004 at 04:50:17:
Mil spec has many grades...I screened Jan, JanTX, JanTXV, as well as some much higher level screening.All the components you receive are 100% tested, BTW..just to different levels.
One day, I was screening a diode group...end result was each diode cost the government 100 dollars...and it was a small 200 milliamp device, real small leads...
Seems a lot? If one of those devices fails in the field, they can find out:
What the device's ele characteristics were, at every stage in it's life..vf to within a millivolt, IR, Bvr..
What the device junction looked like (pictures from all angles)
What the braze joints look like (x rays of it all)
Who tested them, when. Their birthdays, their SS numbers..their home address.
What equipment was used, where..when the equipment was made.
The date of the calibration of all that equipment.
The source of all the material used to make that diode.
The elemental analysis of everything used.
How much radiation the device was given as a pre-conditioning for rad hardening.
And then, one day..I see in the news some tech at an air force base saying how that diode costs the taxpayer 100 DOLLARS!!!! What a ripoff!!! He then stated that he went to (retail outlet name withheld), bought one for 50 cents..and it worked...so much for the high cost of parts being charged the government!!!
Course, the diode he porchased at that retail outlet was from a group of devices that failed some screening test.. Burn in..HTRB, VF, IR..reverse marking..
And the pilot? That diode was for use in a mission critical piece of hardware...mission critical meaning failure of the diode can crash the plane..
There was never a followup on the story to see that the plane survived the repair, or if the tech was court marshalled for compromising the safety of a 100 million dollar plane...to save 100 dollars..
Cheers, John
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Follow Ups
- Re: That's nice to know! - jneutron 10:04:32 02/02/04 (0)
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