[volt-nuts] Bls: Short term "standard" cell?

2017-03-13 Thread Anton Moehammad via volt-nuts 
FYI, I bought two of these used 3458A reference boards for $85 each a few
years ago and they both experience noise bursts.  I plan on replacing the
LTZ1000 chips on them (sometime in the near future).

Randy Evans
AE6YG


Hi Randy,
Any particular reason why You want to replace the LTZ1000 ?

 

Pada Selasa, 14 Maret 2017 3:24, Randy Evans  
menulis:
 

 FYI, I bought two of these used 3458A reference boards for $85 each a few
years ago and they both experience noise bursts.  I plan on replacing the
LTZ1000 chips on them (sometime in the near future).

Randy Evans
AE6YG

On Sun, Mar 12, 2017 at 10:53 AM, m k  wrote:

>
>
> On 12/03/17 17:27, Dr. David Kirkby (Kirkby Microwave Ltd) wrote:
> > On Sun, 12 Mar 2017 at 17:03, Frank Stellmach <
> frank.stellm...@freenet.de>
> > wrote:
> >
> >> Hi Chris,
> >>
> >>
> >>
> >> Therefore,  instead of poking around with these mediocre 10V
> >> "references", I'd look for a possibility to get access to a 3458A, maybe
> >> there's a friendly volt-nuts nearby.
> >>
> >> Frank
> >>
> > There are a number of reference boards supposedly removed from 3458As on
> > eBay. Assuming they are non counterfeit (not necessarily a valid
> assumption
> > for items on eBay), how easy would they be to integrate into a box to
> make
> > a stable reference?
> >
> > The LTZ1000A chip is about $50 new, but to make a stable reference you
> need
> > quite expensive resistors, so a used 3458A reference is attractive. But I
> > don't know if problems making low thermal EMF joints might totally ruin
> the
> > potential performance.
> >
> >
> >
> >
> The suspicion is that they may be genuine, but were rejects because of
> noise bursts. I bought one a while ago, but still not sure of its long term
> stability.
> ___
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Re: [volt-nuts] Short term "standard" cell?

2017-03-13 Thread Randy Evans 
FYI, I bought two of these used 3458A reference boards for $85 each a few
years ago and they both experience noise bursts.  I plan on replacing the
LTZ1000 chips on them (sometime in the near future).

Randy Evans
AE6YG

On Sun, Mar 12, 2017 at 10:53 AM, m k  wrote:

>
>
> On 12/03/17 17:27, Dr. David Kirkby (Kirkby Microwave Ltd) wrote:
> > On Sun, 12 Mar 2017 at 17:03, Frank Stellmach <
> frank.stellm...@freenet.de>
> > wrote:
> >
> >> Hi Chris,
> >>
> >>
> >>
> >> Therefore,  instead of poking around with these mediocre 10V
> >> "references", I'd look for a possibility to get access to a 3458A, maybe
> >> there's a friendly volt-nuts nearby.
> >>
> >> Frank
> >>
> > There are a number of reference boards supposedly removed from 3458As on
> > eBay. Assuming they are non counterfeit (not necessarily a valid
> assumption
> > for items on eBay), how easy would they be to integrate into a box to
> make
> > a stable reference?
> >
> > The LTZ1000A chip is about $50 new, but to make a stable reference you
> need
> > quite expensive resistors, so a used 3458A reference is attractive. But I
> > don't know if problems making low thermal EMF joints might totally ruin
> the
> > potential performance.
> >
> >
> >
> >
> The suspicion is that they may be genuine, but were rejects because of
> noise bursts. I bought one a while ago, but still not sure of its long term
> stability.
> ___
> volt-nuts mailing list -- volt-nuts@febo.com
> To unsubscribe, go to https://www.febo.com/cgi-bin/
> mailman/listinfo/volt-nuts
> and follow the instructions there.
>
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Re: [volt-nuts] Short term "standard" cell?

2017-03-13 Thread m k 


On 12/03/17 17:27, Dr. David Kirkby (Kirkby Microwave Ltd) wrote:
> On Sun, 12 Mar 2017 at 17:03, Frank Stellmach 
> wrote:
>
>> Hi Chris,
>>
>>
>>
>> Therefore,  instead of poking around with these mediocre 10V
>> "references", I'd look for a possibility to get access to a 3458A, maybe
>> there's a friendly volt-nuts nearby.
>>
>> Frank
>>
> There are a number of reference boards supposedly removed from 3458As on
> eBay. Assuming they are non counterfeit (not necessarily a valid assumption
> for items on eBay), how easy would they be to integrate into a box to make
> a stable reference?
>
> The LTZ1000A chip is about $50 new, but to make a stable reference you need
> quite expensive resistors, so a used 3458A reference is attractive. But I
> don't know if problems making low thermal EMF joints might totally ruin the
> potential performance.
>
>
>
>
The suspicion is that they may be genuine, but were rejects because of noise 
bursts. I bought one a while ago, but still not sure of its long term 
stability.
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