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”
Age | Symbol | Description | Label |
|---|---|---|---|
<1 Year | Green ✔ | Measurements less than one year are considered good practice. | “Fresh” |
1-3 Years | Yellow ! | Measurements between one year and three years old are considered acceptable practice. | “Stale” |
>3 Years | Red ✘ | Measurements more than three years old are considered poor practice. | “Outdated” |
Unknown | Red ? | Measurements with unknown age are considered poor practice. | “Unknown” |
Age | Symbol | Description | Label |
|---|---|---|---|
<2 Year | Green ✔ | A measuring device that has been calibrated more recently than two years ago is considered good practice. | “Fresh” |
2-4 Years | Yellow ! | A measuring device that has been calibrated between two years and four years ago is considered acceptable practice. | “Stale” |
>4 Years | Red ✘ | A measuring device that has been calibrated more than four years ago is considered poor practice. | “Outdated” |
Unknown | Red ? | A measuring device that has never been calibrated or whose date of most recent calibration is unknown is considered poor practice. | “Unknown” |
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.
