Keysight EXG and MXG X-Series Signal Generators User’s Guide 409Using BERT for N5172B/82B with Option UN7Bit Error Rate TestIn this example, the triggering sequence is where the trigger delay is active with a cycle count.The reference data is generated by stored data bits. If the BERT measurement accepts data bitsimmediately after receiving a trigger, set the trigger delay to On and the trigger delay count to avalue corresponding to the data format. For PN9 set the delay to 9. If the cycle count is set to morethan 1, it is not necessary to store data bits and no unnecessary delay occurs. Refer to Figure 16-10and “Repeat Measurements” on page 410.Figure 16-10Data ProcessingData RatesData rates up to 90 MHz are supported for BERT analysis on unframed or framed PN sequences.Note that the BERT analyzer supports only continuous PN sequences.SynchronizationImmediately after the trigger event, the DSP for the BERT measurement tries to establishsynchronization using the first incoming bit stream.If the Bit Delay Off On softkey is set to On, the number of bits specified by the Delayed Bits areignored. The synchronization checking is repeated using an error-free bit string, lengthened by theDelayed Bits, until synchronization is established.When the BERT Resync Off On softkey is set to On, the BERT measurements will automatically berestarted if the intermediate BERT measurement result exceeds the value specified by the BERTResync Limits.Special Pattern Ignore FunctionThe special pattern ignore function is especially useful when performing BERT analysis on radiosthat generate consecutive 0’s or 1’s data for traffic channels when they fail to detect the UniqueWord or lose synchronization. If 160 or more consecutive incoming data bits are either 1’s or 0’s,
