[volt-nuts] Agilent calibration

[Demian Martin]

Do you really have a .01 PPM voltage reference? A personal JJ? That's taking
this hobby to a new level. 

> 
> Daniel,
> They are made like that... Problem is with drift.
> When you cal a 3458A the first step is to short the inputs and wait for
the
> thermals to die. Then you do a Cal 0 and the incitement stores all the 0
> offsets for that set of terminals. they you switch to the other set and do
it
> again.
> Next step is apply 10 votes to the terminals or in my case it is 9.9999411
and
> enter cal 9.9999411 front and back set of terminals. remove the voltage
and
> plug in a 10k standard resistor and in my case enter cal 9999.884 for
front and
> back. In most cases AC does not have to be done. The meter is comparing
its
> measure values with the values entered and calculates the correction
factor
> to be used each time a value is displayed.
> Most good meters now days do have a null function so you can look at drift
> or compare 2 values.