[volt-nuts] HP3458A calibration memory backup

[Todd Micallef]

My first thought was that I bought a counterfeit part. The STMicro part has worked well and I like their snaphat option too. I will have to look at making up a few adapter boards for a couple of Solartrons so I can dump those Varta batteries and use something that won't leak everywhere.

Todd

Sent from my iPad

> On Aug 7, 2014, at 10:34, Chuck Harris <cfharris at erols.com> wrote:
> 
> Hi Todd,
> 
> There is nothing that a human could endure that that part couldn't
> take for a couple of years without harm.
> 
> The Chinese run a booming market in taking US scrap boards, removing
> interesting parts, welding on new leads, adding plating, sandblasting
> off old part labels, and putting on new.  They will do both laser
> engraving and stenciling... all this on scrap parts... which they
> sell as new, or new old stock (depending on which gets more money).
> 
> I wonder if Jameco got your DS1220 from a Chinese "refurbisher" that
> simply blasted off the old date code and put on a new?
> 
> I would send a note to Jameco telling them what happened, and I would
> send a picture of the top of the part to Maxim telling them what
> happened.  Maxim can tell you pretty quickly if the part is counterfeit.
> 
> And, they will probably both send you a replacement either way.
> 
> -Chuck Harris
> 
> Todd Micallef wrote:
>> Mark,
>> 
>> I am using the STMicroelectronics M48Z12 series in at least one of my
>> 3458A's. I had trouble sourcing one of the two different memory modules
>> from a reputable seller when I replaced my NVRAM. I purchased a DS1220
>> previously from Jameco and it died shortly afterward. The datecode on the
>> Jameco part was several months old and may have been stored improperly.
>> 
>> The only thing I don't like about the STMicro NVRAM is that they use a
>> three digit datecode. One digit is for the year and two for the week. It
>> took me a while to track down a document to decipher their labeling system.
>> 
>> Todd
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