HP E1313A Manual page 406

voltages". The nature of the tri-filar transformer, or, more accurately,
common-mode inductor, is that it provides a fairly high impedance to
common mode signals, and a quite low impedance to differential mode
signals. The ratio of common-mode impedance to differential-mode
impedance for the transformer we use is ~ 3500:1. Thus, there is NO
differential mode bandwidth penalty incurred by using the tri-filar
transformers.
Appendix F Wiring and Noise Reduction Methods 405
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