PAM Tx Power Excursion

Meas. mode:
Eye
Package License:
L-RND
L-MFG
Flex Apps:
FlexDCA
FlexRT
Waveform type:
PAM4
NRZ
PAM Toolbar
Eye Mode
PAM Setup

The Transmitter Power excursion (TPE) measurement for PAM4 signals is IEEE 802.3cu compatible and is given by the following equation:

where:

  • Pmax is based on a 1e-2 hit ratio, where Pmax is the smallest power level that results in the number of samples above 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.
  • 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.
  • Pavg is the average power of the signal.

When the measurement is selected, the Select Measurement Settings dialog opens where you can specify Hit Ratio and Units (Watts or dBm). By default, the Hit Ratio is set to1.0E-2.

This measurement is not affected by the settings in thePAM-N Analysis Setup dialog.

This measurement can also be performed on an NRZ signal.

To measure

  1. Select Eye/Mask Mode.
  2. Click Auto Scale in the menu toolbar.
  3. Click the toolbar's PAM tab.
  4. On the toolbar, locate and click the Tx Power Excursion button.

SCPI Command

:MEASure:EYE:PAM:TPEXcursion