White weakly seek advice from the gods: hospital equipment calibration in the mandatory calibration, periodic calibration, one-time calibration, what is the difference between the three and the link?

Mandatory calibration refers to the legal metrological appraisal organization must be measured by the measurement of medical instruments, generally refers to the trade settlement, personal safety of medical measuring instruments. Non-compulsory verification can be their own internal verification (if there is a laboratory, and the laboratory has been certified by the measurement of the words). Periodic calibration means that each medical measuring instruments have a calibration cycle, such as electrocardiogram machine, ultrasound machine, ophthalmology optometrist a year a check, sphygmomanometer, pressure gauge half a year a check. One-time calibration means that some instruments apply for calibration at the factory or when they are first used, and do not need to be calibrated again during their service life. I hope to help you.