:MEASure:EYE:PAM:PPAMplitude

Meas. mode:
Eye
Waveform type:
PAM
NRZ
Package License:
RND
MFG
SNT
Flex Apps:
FlexDCA
FlexRT
:PAM Pk-Pk Amplitude Commands

Command Syntax

:MEASure:EYE:PAM:PPAMplitude

Query Syntax

:MEASure:EYE:PAM:PPAMplitude?

Results Tables

Description

Moves the Pk-Pk Amplitude measurement to the top of the Results table. Displays the measurement if it is not already shown on the table. The query form of the command returns the measured value. Pk-Pk Amplitude is an IEEE 802.3cu compatible measurement. Sources can be any displayed waveform, color-grade memory, or function. For example, CHAN1A, CGMemory1, or FUNCtion1.

The PAM Pk-Pk amplitude (in V or W) measurement is defined as:

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.

This measurement can also be performed on an NRZ signal.

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

Use the :MEASure:EBOundary:LEFT, :MEASure:EBOundary:RIGHt, and :MEASure:EBOundary:DEFault commands to change the eye boundary settings. Use :MEASure:TBASe:METHod to change the definition of the waveform's top/base. Use the :MEASure:THReshold:METHod command to change the definition of the waveform's threshold.

Requires FlexDCA revision A.06.60 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, :MEASure:EYE:PAM:PPAMplitude:

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

Child commands for measurement identification:

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

Common Measurement Queries