Re: [volt-nuts] Does desoldering and resoldering an LTZ1000A reset the ageing?

[Andreas Jahn]

Hello,

when I have a "accident" from my unbuffered LTZ-references by shorting 
the output (for a very short time),
(so setting the temperature setpoint to infinite and thus the heater 
cirquit goes to maximum output)

I usually have a large shift on the device. (several ppms).

A part of the shift can be cured by power cycling (cooling down and 
heating up to normal operating temperature).

The remaining shift (-2 .. -5 ppm usually) is permanently on the device.
After such a event I usually have around 6 months increased ageing rate 
until it goes back to the normal -1 .. -2ppm/a


with best regards

Andreas

Am 11.04.2018 um 13:58 schrieb Poul-Henning Kamp:


In message 
, "Dr. David Kirkby" writes:


Does anyone know if desoldering one and resoldering resets the aging
process?

I don't think it "resets" as such, but it certainly starts some kind
of aging process, as does hard knocks, thermal shocks, vibration, ...




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Re: [volt-nuts] Does desoldering and resoldering an LTZ1000A reset the ageing?

[Poul-Henning Kamp]

In message 
, "Dr. David Kirkby" writes:

>Does anyone know if desoldering one and resoldering resets the aging
>process?

I don't think it "resets" as such, but it certainly starts some kind
of aging process, as does hard knocks, thermal shocks, vibration, ...


-- 
Poul-Henning Kamp   | UNIX since Zilog Zeus 3.20
p...@freebsd.org | TCP/IP since RFC 956
FreeBSD committer   | BSD since 4.3-tahoe
Never attribute to malice what can adequately be explained by incompetence.
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[volt-nuts] Does desoldering and resoldering an LTZ1000A reset the ageing?

[Dr. David Kirkby]

There seems to be plenty of evidence that meters like the 3458A improve
stability over time. I believe that most/all is due to improved stability
of the LTZ1000A.

Does anyone know if desoldering one and resoldering resets the aging
process? I see a number of used LTZ1000A ICs on eBay that look like they
have been poorly removed. They are about the same price as a new LTZ1000A.
I wonder if
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[volt-nuts] Does desoldering and resoldering an LTZ1000A reset the ageing?

[Dr. David Kirkby]

There seems to be plenty of evidence that meters like the 3458A improve
stability over time. I believe that most/all is due to improved stability
of the LTZ1000A.

Does anyone know if desoldering one and resoldering resets the aging
process? I see a number of used LTZ1000A ICs on eBay from China that look
like they have been poorly removed. They are about the same price as a
brand new LTZ1000A.

I wondering if properly removed, a used chip is no more stable than a new
one.



Dave
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