:MEASure:EYE:PAM:UNDershoot

PAM Undershoot Commands

Command Syntax

:MEASure:EYE:PAM:UNDershoot

Query Syntax

:MEASure:EYE:PAM:UNDershoot?

Moves the PAM Undershoot measurement to the top of the Results measurement results. Displays the measurement if it is not already shown on the table. The query form of the command returns the measured value. PAM Undershoot is an IEEE 802.3cu compatible measurement.

The PAM Undershoot measurement is reported as a percentage and is defined as:

Where:

  • Pmin is based on a 1e-2 hit ratio, where Pmin is the largest power level that results in the number of samples below that level not exceeding the product of hit ratio and total number of observed samples. All samples are acquired in a single unit interval eye diagram.

By default, the hit ratio 1e-2 is based on the IEEE 802.3cu standard. However, you can change this ratio using the :MEASure:EYE:PAM:UNDershoot:THRatio command.

Common Measurement Queries