[volt-nuts] Guildline 9154C

[David C. Partridge]

Bill,

That is very clear, thank you.  For my purposes, a solid state voltage standard would seem to be the answer.

I've not the equipment to make use of these at this time, nor to be honest the time to do that level of tracking. 

Regards,
David Partridge
-----Original Message-----
From: volt-nuts-bounces at febo.com [mailto:volt-nuts-bounces at febo.com] On Behalf Of WB6BNQ
Sent: 14 December 2012 22:42
To: Discussion of precise voltage measurement
Subject: Re: [volt-nuts] Guildline 9154C

Actually,

They are unsaturated cells and moving them is not a big deal so long as you do not bust them by rough handling.  They also last a long time (decades) so long as you don't draw current from them.  They are temperature sensitive and thus the temperature of the reference measurement must be known and noted for the reported value to have meaning.  These Guildline devices are made for transportation, obviously, and the chances are they are probably in good shape and quite usefull.

The absolute value of the cells is only important relative to the final determination of that particular cell group and the national standard.  That is something that you would have to establish after you got the unit and determined that the cells were indeed properly functional.

But, the only way you are going to know the condition is by careful measurements inter-comparing them to determine their stability and drift characteristic at a constant temperature.  Standard cells require constant (meaning at least once a day) measurements and comparison between themselves to have confidence on the banks mean value and stability.  They could be a damn fine standard if utilized correctly.

If the seller is close to you, perhaps you could take a decent voltage source (like a Fluke 332 type) and good null meter (like a Fluke 845) with you and determine the general condition prior to purchase ?

Bill....WB6BNQ


"David C. Partridge" wrote:

> That makes a good deal of sense.
>
> Regards,
> David Partridge
> -----Original Message-----
> From: volt-nuts-bounces at febo.com [mailto:volt-nuts-bounces at febo.com] 
> On Behalf Of m k
> Sent: 14 December 2012 21:57
> To: volt-nuts at febo.com
> Subject: Re: [volt-nuts] Guildline 9154C
>
> Hi David,
>
> My take on it is a bunch of standard cells, he mentions 1.0183 volts per cell, but they are likely to be unsaturated cells that most likely are past the end of useful life. I thought about bidding, but the likely hood of any useful life left means I wont even bother to bid.
>
> M K
>
> > From: david.partridge at perdrix.co.uk
> > To: volt-nuts at febo.com
> > Date: Fri, 14 Dec 2012 20:55:05 +0000
> > Subject: [volt-nuts] Guildline 9154C
> >
> > Google has failed me! Does anyone know anything about these?
> >
> > Regards,
> > David Partridge
> >
> >
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