100g +/- 0.1 mg metrology weight standard?

100g +/- 0.1 mg metrology weight standard?

This topic has 3 replies, 3 voices, and was last updated 19 November 2024 at 00:30 by Michael Gilligan.

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18 November 2024 at 21:18 #765183
Ian P
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@ianp
This came from a metrology department that closed down and I have wondered what the tolerance number mean in real terms. the plus minus value of 0.1mg seems to infer that this 100 gram weight is +/- one millionth of its value.

Is that correct?

Ian P

Ian P
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18 November 2024 at 21:46 #765186
Clive Steer
Participant
@clivesteer55943
Hi Ian

The item is 100 grams reference mass with a tolerance of 0.1milligrams. How much it weighs will depend on the value of gravity at the place of measurement. If you have two of these and place them on a mass balance, which look like an Apothicary’s scale, they will balance. A force balance, which is the more normal instrument for weighing, only measures the force acting on the mass due to gravity so the instrument will need a known reference mass to calibrate it and this is what these are commonly used for.

Mass standards can be toleranced to +/- micrograms and are usually made of materials that don’t oxidise and never handled.

CS
18 November 2024 at 22:37 #765193
Ian P
Participant
@ianp
I understand the effect of gravity and the need to use care in handling standard weights that comply to international standards.

I Googled quite a bit but could not see what class of accuracy this weight fits into.

Ian P

Edit, But I dont have the test certificate anyway
19 November 2024 at 00:30 #765230
Michael Gilligan
Participant
@michaelgilligan61133
Rather strangely … this NPL page refers to 2019 as a time in the future … but, putting that aside, it’s a good ‘rabbit hole’

https://www.npl.co.uk/mass-mechanical-measurement/mass-standards

MichaelG.

.

Ref. https://www.npl.co.uk/kibble-balance
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