主题：【讨论】如何确定校准周期？

校准周期一般为1年，为什么不说半年或2年或更长？
我看了一下计量溯源性的定义(BIPM):
Traceability - The property of the result of a measurement or the value of a standard whereby it can be related to stated references, usually national or international standards, through an unbroken chain of comparisons, all having stated uncertainties. The level of traceability establishes the level of comparability of the measurement – essentially, whether the result of a measurement can be compared to the previous one, a measurement result made a year ago, or to the result of a measurement performed anywhere else in the world.

"...溯源高低程度确定了测量可比性的程度 -- 本质上讲，测量的结果是否能与先前测试的结果比，和1年前测量的结果比，或和与世界上任何地方的测量结果相比 ..."

我的问题如下：

- 1年校准周期是否与上述定义有牵连？
- 如何确定校准周期？下面是建议的方法（ILAC-G24）：

Methods of reviewing calibration intervals
Method 1: Automatic adjustment or “staircase” (calendar-time)
Method 2: Control chart (calendar-time)
Method 3: “In-use” time
Method 4: In service checking, or “black-box” testing
Method 5: Other statistical approaches