:MEASure:EYE:EWIDth

NRZ Eye Width Commands

PAM Waveform?

Use this command instead:

Command Syntax

:MEASure:EYE:EWIDth

Query Syntax

:MEASure:EYE:EWIDth?

Description

Moves the Eye Width 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.

Eye Width is a measure of the horizontal opening of an eye diagram.

Use the :MEASure:EYE:EWIDth:SOURce command to specify the real-time eye diagram on which to make the measurement.

Use :MEASure:TBASe:GENeral:METHod to change the definition of the waveform's top/base.

Use the :<waveform>:THReshold:GENeral:METHod command to change the definition of the waveform's threshold.

This measurement can be applied to NRZ eye waveforms but not PAM eye waveforms.

Example Command Sequence

:MEASure:EYE:EWIDth:SOURce ECHannel1
:MEASure:EYE:EWIDth
:MEASure:EYE:EWIDth?

Measurement Ready?

To confirm that the measurement is ready to read, you can query the measurement's status:

if ('CORR' in Infiniium.query(':MEASure:EYE:EWIDth:STATus?')):
	measurement = Infiniium.query(':MEASure:EYE:EWIDth?')

If averaging is turned on (:ACQuire:SMODe AVERage), you can also confirm if the measurement result is ready by comparing the number of specified averages (:ACQuire:COUNt?) versus the number of measurement sweeps that have occurred (:ACQuire:COUNt?). The technique uses the :COUNt? common measurement query. For example,

if (Infiniium.query(':MEASure:EYE:EWIDth:COUNt?') >= Infiniium.query(':ACQuire:COUNt?')):
	measurement = Infiniium.query(':MEASure:EYE:EWIDth?')

You can also use an acquisition limit test to test that a number of waveforms or samples have completed before returning a measurement. Refer to the :LTESt:ACQuire:CTYPe command.

Querying Measurement Results and Statistics

You can query measurement results using the :MEASure:EYE:EWIDth? query after making the proper instance settings.

If a measurement is installed into Results table (using the :MEASure:EYE:EWIDth command) and you have made the proper instance settings, you can query statistics using common child queries.

Also, you can query measurement results and statistics directly from the Results table (without having to make the proper instance settings beforehand). See Querying Measurement Results and Statistics.