Operating Manual Vol 1 - ES Documentation

SMIQBit Error Rate Testreliable BLER can only be obtained when a sufficient number of errors occurs inthe observed interval. Only this ensures that the single BLER measurement resultapproaches the true error rate with high probability.TerminationcriteriaInterruption ofmeasurementTo keep the measurement time short for low and high block error rates, twotermination criteria have been provided in the SMIQ for the BLER measurement.• Criterion 1: Total number of blocksThe measurement is terminated when the specified number of data blocks ischecked. Due to this criterion the BLER measurement is reliably terminatedafter the specified number of blocks even if no error or only a few errors weredetected; the measurement result may not be statistically reliable (if few blockerrors occur).• Criterion 2: Number of errorsThe measurement is terminated when the specified number of block errors hasoccurred. With this criterion, the measurement is rapidly terminated when theblock error rate is high. Since a great number of errors has been counted, themeasurement result is statistically reliable.The two criteria are used together. The criterion which finally yields a valid result isdisplayed under ("Measurement terminated by...").After termination of a measurement, the restart of a new one is delayed until thefirst measurement result has been queried with :BLER:RES?.1125.5555.03 2.381 E-9