LeCroy AP034 Instruction Manual page 25

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seldom a pure sine wave. Signals with pulse wave shapes
contain frequency components much higher than the repetition
rate may suggest. As such, it is very difficult to predict actual
performance in the application for CMRR-versus-frequency
graphs. The practical application of these graphs is to compare
the relative common mode rejection performance between
different probes or amplifiers.
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AP034-OM-E Rev D ISSUED: January 2000