EXFO FTB/IQS-88000 Series Power Blazer for FTB-2/2Pro/500/IQS-600 - Manual (Page 502)

Test Functions
490 FTB/IQS-88000 Series
RTD

Disabled: Indicates that the RTD feature is disabled.

--: Indicates that the RTD measurement is not ready.
Reset
Resets the RTD results and measurement counts.
Delay
Indicates the time required for a bit to travel from the transmitter back to its
receiver after crossing a far-end loopback.

Last indicates the result of the last Round Trip Delay measurement.

Minimum indicates the minimum Round Trip Delay recorded.

Maximum indicates the maximum Round Trip Delay recorded.

Average indicates the average Round Trip Delay value.

Unit measurement selections are ms (default) and μs.
Count
Indicates the total number of successful and failed measurements.
Successful: A measurement is declared successful when the RTD is
smaller or equal to 2 seconds.
Failed: A measurement is declared failed when the RTD is > 2 seconds.