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Application Notes
This application note describes how to make BER (bit error ratio) measurements using a real-time oscilloscope, when integrated into M8070B BERT system software. The configuration can include a BERT pattern generator or AWG. The real-time oscilloscope can be used to measure BER to higher data rates than traditional BERT error detectors. The basic differences between this method and the traditional BER measurement approach using the M8040A high performance BERT are explained, where both use the same M8045A pattern generator (PG) to generate the pattern stream. The hardware and software configurations of the setup using the real-time oscilloscope as pattern capture front-end are described. Subsequently topics such as the measurement details of BER including variation of BER under different data rates, time required to complete the measurement, and input sensitivity of real-time scope are discussed. Finally, the differences between the BERT and real-time oscilloscope-based approaches are explained in detail.
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