:MEASure:EYE:PAM:TPEXcursion

Meas. mode:
Eye
Package License:
L-RND
L-MFG
Waveform type:
PAM4
NRZ
Flex Apps:
FlexDCA
FlexRT
Tr Power Excursion Commands

Command Syntax

:MEASure:EYE:PAM:TPEXcursion

Query Syntax

:MEASure:EYE:PAM:TPEXcursion?

Description

Starts the Transmitter Power excursion (TPE) measurement for PAM-4 signals which 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.

Before sending this command, select the hit ratio use in the measurement with the :MEAS:EYE:PAM:TPEXcursion:THRatio child command. Use the :MEAS:EYE:PAM:TPEXcursion:UNITschild command select the measurement units: Watts or dBm.

This measurement is not affected by the PAM-N definition commands settings.

This measurement can also be performed on an NRZ signal.

Requires FlexDCA revision A.06.70 and above.

Measurement Identification

Avoid subtle programming errors! To ensure that the correct measurement is installed or queried, always explicitly identify a measurement when installing a measurement or querying a measured value, status, or detail. To identify a measurement, specify the measurement's source waveform (:SOURce child command). With some measurements, you may also need to specify other identifying values. Generally, when selecting a measurement using FlexDCA's GUI, if a dialog appears prompting you to select values, you should explicitly specify these values when remotely identifying the measurement. More information.

For example, to return the status of the measurement, :

flex.write(':SOURce CHAN1A')
if flex.query(':STATus?') == 'CORR';
    measurement = flex.query('?')
else:
	details = flex.query(':STATus:DETails?')
	reason = flex.query(':STATus:REASon?')

Child commands for measurement identification:

  • :MEASure:EYE:PAM:TPEXcursion:SOURce
  • :MEASure:EYE:PAM:TPEXcursion:THRatio
  • :MEASure:EYE:PAM:TPEXcursion:UNITs