[volt-nuts] Fluke 732A Questions

[J. L. Trantham]

Jeff,

Too late. 

I have already moved the jumpers and adjusted all of the front panel adjustments to achieve the desired output voltages.

Since I don't have any 'historical' data about the performance of my specific unit, I will 'start from scratch' on the unit I now have.  Whether to send it out for calibration or just keep it, adjusted by the 3458A, and watch from now on is the issue.

I don't have enough data to decide about long term stability at this point but I am gaining valuable information about how long it will last on batteries and how to go about preparing it for shipment for calibration if I go that way.

Thanks for the input.

Joe

-----Original Message-----
From: volt-nuts-bounces at febo.com [mailto:volt-nuts-bounces at febo.com] On Behalf Of jeffhook at comcast.net
Sent: Tuesday, December 31, 2013 5:23 PM
To: Discussion of precise voltage measurement
Subject: Re: [volt-nuts] Fluke 732A Questions



Hi,  



Are you guys adjusting your 732As? 

I have a friend that works in a large CAL lab and he told me to never adjust my 732As, just compare them. 

They send out their 732 Bs to Fluke but are never adjusted, just compared and sent back with current voltage reading ?? 



Thanks - Jeff  



----- Original Message -----


From: "Charles Steinmetz" <csteinmetz at yandex.com>
To: "Discussion of precise voltage measurement" <volt-nuts at febo.com>
Sent: Tuesday, December 31, 2013 9:56:37 AM
Subject: Re: [volt-nuts] Fluke 732A Questions 

Joe wrote: 

>Where did you find the resistance of the thermistor 'as shipped'?  I 
>saw mention of being supplied to the original owner when shipped as 
>well

It was recorded on the original factory cal certificate.  I have the original certificates for two of mine.  The others had rear panel stickers applied by their original owner (a cal lab). 

A properly working, good example should hold 0.1 ppm or better year in, year out.  I've seen some that do not meet that, but lots of them do.  I'm not aware of any other non-JJ standard that can match it, including most 732Bs.  (Some folks think 732As are generally better than 732Bs because they are older and, thus, more stable because better aged.  I think there is more to it -- many 732Bs are plenty old enough to have settled down to that level if they are ever going to, but even the older 732Bs don't, in general, seem to exhibit quite the stability of the 732As.) 

Best regards, 

Charles 



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