[volt-nuts] Solartron 7081, other meters, and some voltage standards

[gbusg]

Yeah, Joe, the "10.00006" 3457A reading you're seeing is *very* typical of 
what I've seen before on other 3457As. They seem to drift more positive, at 
a very slow pace. (By now they're very old and so their internal "cal" 
references have aged nicely.) But do keep in mind that, due to other 
short-term tempco and warm-up issues, I wouldn't trust the 3457A for 
decisions any closer than approximately 5ppm of target at 10Vdc.

I'm guessing (but have no proof) that your 'black' face 731B might be very 
stable - maybe significantly better than Fluke's published spec. If that 
turns out to be the case, I'd be tempted to choose the 'black' 731B as the 
device to transfer 10Vdc from another lab into my own lab.

I don't have any experience with the Solartron 7081, so I'd like to hear 
from everybody (who's in the know about it). I'd also like to see its 
datasheet and/or manual.

-Greg


----- Original Message ----- 
From: "J. L. Trantham" <jltran at att.net>
To: "Discussion of precise voltage measurement" <volt-nuts at febo.com>
Sent: Friday, September 02, 2011 6:36 PM
Subject: Re: [volt-nuts] Solartron 7081, other meters,and some voltage 
standards


OK.  Thanks for info that I did not know.  I'll have to actually read the
manual.

After the first set, it ranged from 10.00001 to 10.00010.  After the second
set of button pushes, it reads 10.00006 when connected to the 'black' face,
9.99995 when connected to the 'white' face unit, and 10.00046 when connected
to the 335A.

Now, the next question.

If you were to spend the money to get something calibrated, what would you
choose?

If you chose one of the voltage standards, you could use that to 'calibrate'
the meters, and, thus, the other standards.  However, if you chose one of
the meters, you could use that to 'calibrate' the standards, and thus, the
other meters.  And, another question, what, actually, can you get
'calibrated' on this list?

And, I agree with Dave.  A man with one watch ........

Thanks in advance.

Joe