Q: Construction of a 8.5 digit multimeter

Feb 13, 2005 2 Replies
H

Hello!



Has someone of you experience how a high precision multimeter is constructed ?



e.g.:

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How is the voltage reference stabilized? (by using an oven?)



Are the input voltage divider temperature stabilized ? (temp. coeff.)



How is the self calibration done?



What type of ADC is used (maybe time to digital converter) ?



How is the integral and differential non-linearity measured and compensated ?


THANKS a lot for your help



Harald Noack


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A

If you peruse back through old copys of the HP Journal, there was an article on the design of the HP3458A, which should answer your questions in detail. Mine are packed away so I can't give you the date.

Hope this helps

Andrew

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C

Careful -- precision isn't worth much without accuracy, and you're going to have a heck of a time calibrating to a commensurate accuracy.

The e-mail address in our reply-to line is reversed in an attempt to minimize spam. Our true address is of the form che...@prodigy.net.
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