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Building a dmm calibrator

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Napalm2002:
So many of us buy used dmm's, and sending all of them out to cal can be expensive. Does anyone have any solutions?

jadew:
Calibrate one and check the others against the calibrated one :)

scientist:
Read the title as "Building a damn calibrator"   O0
Couldn't help myself.

Dr. Frank:
All those above mentioned DIY solutions, e.g. with only one reference (as 5.0000V) are no "dmm calibrators" at all, and therefore are useless, as you need the full range of Cardinal Points for a complete calibration.

For DCV calibration, for example, you need at least a stable DCV supply which delivers 1000V, 100V, 10V, 1V, 100mV.

Then you need a precise/calibrated reference, i.e. 10V for comparison.

And you need a transfer standard to transfer the uncertainty of the 10V reference to the 4 other cardinal voltages.
A Hammon type divider like the 752A is needed for that.

Same is valid for  ACV, DCI, ACI, Ohm, and so forth.

I own a Fluke 5442A, 5200A, a HP3458A, a self made precision (1ppm) Hammon divider, several precision 10V and 10kOhm references and constant current sources.

So I am able to adjust all of my equipment on my own, but not traceable to the official SI.
Anyhow I estimate an SI uncertainty of few ppm for U, I, R....

To obtain traceability, that would cost a fortune.

Frank

Napalm2002:
I'm Basically looking for something to
Make sure that most of what I use is very close to spec. I I found something way of and it wasn't a simple adjustment that I could make then I would send the item out for Cal.  Thanks for all the replies!   

Mike m

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