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Products => Test Equipment => Topic started by: technix on November 16, 2018, 06:26:28 am

Title: Definitions of ampere, volt and ohm are subjected to change.
Post by: technix on November 16, 2018, 06:26:28 am

The definition of volt will be changed by about 100ppb and ohm a few tens ppb, due to overhauls of definition of kg and ampere.

Will this invalidate ALL calibrations on any equipment with 7.5 digits or more accuracy like the HP 34470A?
What about 6.5 digit equipment like HP 34461A/34401A?
What about the 4.5 digit jobs like Fluke 87V and Uni-T UT61E?

Title: Re: Definitions of ampere, volt and ohm are subjected to change.
Post by: Mr. Scram on November 16, 2018, 06:27:42 am

See the existing thread here: https://www.eevblog.com/forum/metrology/time-to-get-all-our-instruments-recalibrated/msg1968140/#msg1968140 (https://www.eevblog.com/forum/metrology/time-to-get-all-our-instruments-recalibrated/msg1968140/#msg1968140)

Title: Re: Definitions of ampere, volt and ohm are subjected to change.
Post by: coromonadalix on November 16, 2018, 11:50:07 am

would like to see the change(s) on a 12 digits voltmeter ...  dont recall the model but it had a small thread here ?

Title: Re: Definitions of ampere, volt and ohm are subjected to change.
Post by: bson on November 17, 2018, 03:41:18 am

it should be pretty straightforward to issue a firmware update that can use existing cal data.