我在医院作计量工作已经十多年了，在每年的周期检定工作中，发现有的计量器具每年使用次数少，仪器稳定性能好，年年检定合格。而有的计量器具使用非常频繁，在检定周期内经常出现故障，修复后投入使用，是否合格无从知晓，只有等到下一个检定周期。如监控病人吸氧量大小的氧? I have been in the hospital for measurement work for more than ten years, and in the annual cycle of verification work, found that some measuring instruments used less each year, the instrument stable performance, annual test pass. However, some measuring instruments are used very frequently, frequently fail during the test cycle, put into use after being repaired, and whether the qualification is unknown or not, only until the next test cycle. Such as monitoring the size of oxygen patient oxygen?