:MEASure:EYE:DCDistortion

Meas. mode:
Eye
Waveform type:
NRZ
Flex Apps:
FlexDCA
FlexRT
Duty Cycle Distortion Commands

Command Syntax

:MEASure:EYE:DCDistortion

Query Syntax

:MEASure:EYE:DCDistortion?

Description

Moves the Duty Cycle Distortion 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. Duty Cycle Distortion is a measure of the time separation between the rising edge and falling edge at the 50% level of the eye diagram (middle threshold). Duty Cycle Distortion is caused by ones having a different duration than zeros. You can choose to view duty cycle distortion expressed as time or percentage (DCDFormat) of the time difference relative to the full symbol period. Sources can be any displayed waveform, color-grade memory, or function. For example, CHAN1A, CGMemory1, or FUNCtion1. Use the :MEASure:EBOundary:LEFT, :MEASure:EBOundary:RIGHt, and :MEASure:EBOundary:DEFault commands to change the eye boundary settings.

This Eye mode measurement can be applied to NRZ waveforms but not PAM4 waveforms.

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:DCDistortion:

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

Child commands for measurement identification:

  • :MEASure:EYE:DCDistortion:SOURce
  • :MEASure:EYE:DCDistortion:FORMat

Example Command Sequence

:MEASure:EYE:DCDistortion:SOURce CHAN1A
:MEASure:EYE:DCDistortion:DCDFormat TIME
:MEASure:EYE:DCDistortion
:MEASure:EYE:DCDistortion?

Common Measurement Queries