Fluke 831 User Manual page 113

If the sensor firmware update is not carried out when the notification appears, the update
action may be initiated through "Sensor properties". An "UPDATE" hint appears next to the
older sensor firmware version.
Tap "UPDATE" to proceed with the sensor firmware update.
Note
The sensor firmware update notification continues to appear once everyday until the
firmware update is completed.
Notification on sensor calibration
Note
The calibration accuracy of the sensor should be checked every two years as indicated
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