{
  "resourceType" : "DeviceMetric",
  "type" : " CodeableConcept ", 
  "identifier" : " Identifier ", 
  "unit" : " CodeableConcept ", 
  "source" : " Reference(Device) ", 
  "parent" : " Reference(DeviceComponent) ", 
  "operationalStatus" : "<code>", 
  "color" : "<code>", 
  "category" : "<code>", 
  "measurementPeriod" : " Timing ", 
  "calibration" : [{ 
    "type" : "<code>", 
    "state" : "<code>", 
    "time" : "<instant>" 
  }]
}