Drift Rate Calculator

Compute drift rate as (x₂ − x₁)/Δt from two readings and the elapsed time to assess instrument stability during periodic verification.

📐 计算公式

仪器漂移率：drift = (末次值 x₂ − 初始值 x₁) ÷ 时间间隔 Δt（每天）；联动卡：总漂移量 = x₂ − x₁、单位漂移所需时间 = 1 ÷ (|drift| 或 1)。校验：x₁、x₂、Δt 三项非空合法数值守卫。判据：无固定分级，漂移率保留 4 位小数，绝对值越小仪器越稳定。

输入前后测得值与时间间隔，求漂移率。

初始值 x₁

末次值 x₂

时间间隔 Δt (天)

Item	Formula / Note	Source / Standard
Drift rate	Drift rate = (x2 - x1)/Δt, describing slow change of a metrological property over time	JCGM 200:2012, International Vocabulary of Metrology (VIM)
Stability	The ability of a measuring instrument to keep its metrological properties constant over time	JCGM 200:2012, International Vocabulary of Metrology (VIM)
Use in intermediate checks	Drift is monitored between calibrations to verify the instrument stays within limits	ISO/IEC 17025:2017, General requirements for the competence of testing and calibration laboratories
Units	Commonly expressed per hour, per year, or as a percentage per year	JCGM 200:2012, International Vocabulary of Metrology (VIM)

📌 计算说明

📚 深度解析：漂移率