[volt-nuts] HP 3457A calibration?

[Dr. David Kirkby]

On 20 August 2013 02:59, J. L. Trantham <jltran at att.net> wrote:
> Interesting video.

A bit of a silly video IMHO. I can't take anyone seriously who
measures the noise on a 6.5 digit multimeter by looking at the digits
which change as it is across his standard bench power supply.
Personally I would have thought one measured the stability of the
bench supply by measuring with the DVM rather than the other way
around

> On the 3458A that I was able to 'kill' the 'cal RAM', the 'cal counter' was
> at '1' when I received it.  When I finished doing my 'home cal' on a 'blank'
> 'cal RAM', the 'cal counter' was about 20 or so.  It appears that every
> measurement that is calibrated increments the 'cal counter'.

I was thinking about that cal ram, and the issues changing the
battery. If one intends sending the meter away for cal, is there any
point in worrying about if the ram is kept alive? I guess it might be
nice to know the performance before it was calibrated as Agilent will
give you, but there is a bit of a risk of damaging chaning the battery
live.

I intend changing the battery in mine then sending it for cal.

Dave