Test repeatability formula

[DavidDLC]

I need to do a tester repeatability.

Wikipedia says:

Repeatability or test–retest reliability is the variation in measurements taken by a single person or instrument on the same item, under the same conditions, and in a short period of time

But there is no formula nor targets.

Does anybody have the formula and targets for it ?

David.

[Neilm]

This depends on what you are testing. For example, a multi-meter measuring a resistor should be very repeatable - within a digit. However, I did read an international standard on testing transformer oil that says if you get within about 7% for reputability it is doing good.

[tggzzz]

I need to do a tester repeatability.

Wikipedia says:

Repeatability or test–retest reliability is the variation in measurements taken by a single person or instrument on the same item, under the same conditions, and in a short period of time

But there is no formula nor targets.

Does anybody have the formula and targets for it ?

David.

Depends on what the specific situation requires.

I know of one piece of test equipment that was accurate to 0.1dB (of attenuation) but had a stability and repeatability of 0.001dB. Since the requirement was to measure changes in attenuation, the absolute accuracy was relatively unimportant.