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#### NickF

Hi All,

I have a discussion with a colleague about using the specifications from the Fluke 5500A calibrator. The operating manual can be found online at https://assets.fluke.com/manuals/5500a___omeng1100.pdf, and it shows at page 1.11 about DC Voltage specifications. The description for "Absolute Uncertainty" is "? (% of output + ?V)". If we check the range of 0 to 32.99999 V and for the interval of 1 year, the absolute uncertainty is defined as "0.005% and 50uV".

If I use the calibrator to generate a DC voltage of 10V, what is the absolute accuracy coming from 5500A? My understanding is that it is 0.005%*10V +50uV = 0.55mV.

If I got his point right, he explains that this uncertainty is stated for 33V and therefore the whole thing has to be multiplied by 10/33, therefore the absolute uncertainty he comes up with for 10V is (0.005%*10V+50uV)/3.3 = 0.167mV. We could not discuss it any further, because he got so aggravated by mental blockage and lack of understanding, that we had to stop the conversation

Regards,

Nick

I have a discussion with a colleague about using the specifications from the Fluke 5500A calibrator. The operating manual can be found online at https://assets.fluke.com/manuals/5500a___omeng1100.pdf, and it shows at page 1.11 about DC Voltage specifications. The description for "Absolute Uncertainty" is "? (% of output + ?V)". If we check the range of 0 to 32.99999 V and for the interval of 1 year, the absolute uncertainty is defined as "0.005% and 50uV".

If I use the calibrator to generate a DC voltage of 10V, what is the absolute accuracy coming from 5500A? My understanding is that it is 0.005%*10V +50uV = 0.55mV.

If I got his point right, he explains that this uncertainty is stated for 33V and therefore the whole thing has to be multiplied by 10/33, therefore the absolute uncertainty he comes up with for 10V is (0.005%*10V+50uV)/3.3 = 0.167mV. We could not discuss it any further, because he got so aggravated by mental blockage and lack of understanding, that we had to stop the conversation

Regards,

Nick

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