2-Port Shunt Through Impedance Measurement

Example of how to measure 2-Port shunt impedance on your (Voltage Regulator Module) VRM.

Power plane impedance is the most common power integrity assessment, and the 2-port shunt through method is the gold standard for that assessment.  Sub-milliOhm power plane impedance is necessary to maintain power rail voltages within limits during large transient current demands.

Source:

• Arbitrary/Function Generator (built into 6 Series MSO)
• Picotest J2161A Splitter

Measurement:

• 6 Series MSO Oscilloscope
• Picotest J2102B Common Mode Coaxial Transformer for isolation
• Picotest P2102A 2-Port 50Ω Transmission Line Probe
• Picotest DC blocks (x2)

Videos recorded by:
Tony Ambrose, Application Engineer, Tektronix
Steve Sandler, Founder, and CEO of PICOTEST.com