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H Probe Usage

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The CW505 Planar H-Field Probe (or another H-field probe) can be used to perform side-channel power analysis on a target without inserting a series shunt resistor. In practice this is very simple, it ends up requiring you to (reliably) hold the probe over the chip, for example as shown here:

Hprobe xmega.jpg

Video Example

Trace Comparison

The following shows the power traces measured using the shunt resistor:

Htest shuntresistor.png

And the same board (but with a higher amplifier setting) using H-Field probe:

Htest hprobe raw.png