Measurement Freshness

measurement and device calibration freshness display for best results targets should be remeasured on a regular schedule and only relatively fresh measurements should be trusted additionally, for best results the measuring device itself should be factory calibrated on a regular schedule (e g sending an i1 spectrophotometer to x rite) to this end the measurement file format for oq labels requires a created date on which the measurements were taken and recommends a calibration date on which the device was most recently factory calibrated (or its date of purchase if no subsequent calibration has been performed) openqualia compliant software should (but is not required to) provide guidance to the user based on these fields this should take the form of a field named “measurement age” and “measuring device calibration age” measurement age (created field) age symbol description label <1 year green ✔ green ✔ measurements less than one year are considered good practice “fresh” 1 3 years yellow yellow ! measurements between one year and three years old are considered acceptable practice “stale” >3 years red ✘ red ✘ measurements more than three years old are considered poor practice “outdated” unknown red red ? measurements with unknown age are considered poor practice “unknown” measuring device factory calibration age (calibration date field) age symbol description label <2 year green ✔ green ✔ a measuring device that has been calibrated more recently than two years ago is considered good practice “fresh” 2 4 years yellow yellow ! a measuring device that has been calibrated between two years and four years ago is considered acceptable practice “stale” >4 years red ✘ red ✘ a measuring device that has been calibrated more than four years ago is considered poor practice “outdated” unknown red red ? a measuring device that has never been calibrated or whose date of most recent calibration is unknown is considered poor practice “unknown” older measurement file archiving and retrieval when a new measurement file is uploaded for a unique manufacturer/targetype/targetid combination the default behavior is to set the new measurement as the active measurement – the one provided when the url is called with accessmode=activemeasurement oq label measurement hosts may optionally retain additional measurements and present them in the interactive view in this case they should serve all measurements (past and most recent) as a zip when the url parameter accessmode=allmeasurementszip is passed in the url that allows the client software to offer a selection from all available measurements