March 20, 2023

November 12, 2022

March 15, 2022

August 9, 2021

August 2, 2021

March 1, 2021

August 28, 2020

August 27, 2020

August 19, 2020

August 12, 2020

August 10, 2020

August 10, 2020

The Critical Change Value

Aristo Trilog slide rule

The critical change value indicates the maximum amount of change allowed in the meter’s energy registers during disturbance tests without any current flowing in the meter’s current circuits.