Q: Construction of a 8.5 digit multimeter
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Q: Construction of a 8.5 digit multimeter

 
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Harald Noack
Guest
Posted: Sun Feb 13, 2005 6:10 am    Post subject: Q: Construction of a 8.5 digit multimeter Reply with quote
Hello!

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

e.g.: http://www.home.agilent.com/USeng/nav/-11250.536881781/pd.html

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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Andrew Tweddle
Guest
Posted: Sun Feb 20, 2005 7:30 pm    Post subject: Re: Q: Construction of a 8.5 digit multimeter Reply with quote
Harald Noack wrote:

Quote:
Hello!

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

e.g.: http://www.home.agilent.com/USeng/nav/-11250.536881781/pd.html

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



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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CJT
Guest
Posted: Mon Feb 21, 2005 5:40 am    Post subject: Re: Q: Construction of a 8.5 digit multimeter Reply with quote
Harald Noack wrote:
Quote:
Hello!

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

e.g.: http://www.home.agilent.com/USeng/nav/-11250.536881781/pd.html

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



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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