:MEASure:JITTer:EWIDth

Meas. mode:
Jitter
Package License:
L-RND
Waveform type:
NRZ
PAM4
Flex Apps:
FlexDCA
Eye Width Commands

Command Syntax

:MEASure:JITTer:EWIDth

Query Syntax

:MEASure:JITTer:EWIDth?

Description

Returns the NRZ Eye Width measurement which measures the width of the specified eye. On PAM4 signals, use the :MEASure:JITTer:EWIDth:EYE command to select returning the measurement on one of three possible eyes (Eye 0/1, Eye 1/2, or Eye 2/3).

Moves measurement results on the top row of the Eye table. If the table is not already displayed, a "−221, Settings conflict" error message is generated. The query form of the command returns the measured value. Use the :MEASure:AMPLitude:DEFine:ANALysis command to turn on Amplitude analysis and to display the Amplitude table. The query form of the command returns the measured value.

PAM4 Waveform?

For PAM4 waveforms, use this recommended (identical algorithm) command instead:

NRZ Waveform

PAM4 Waveform

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:JITTer:EWIDth:

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

Child commands for measurement identification:

  • :MEASure:JITTer:EWIDth:SOURce

Amplitude analysis must be turned on before the first interference measurement can be made. Use the :MEASure:AMPLitude:DEFine:ANALysis command.

Requires FlexDCA revision A.05.60 and above.

Measurement Ready?

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

if ('CORR' in Flex.query(':MEASure:JITTer:EWIDth:STATus?')):
	measurement = Flex.query(':MEASure:JITTer:EWIDth?')

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

if (Flex.query(':MEASure:JITTer:EWIDth:COUNt?') >= Flex.query(':ACQuire:ECOUNt?')):
	measurement = Flex.query(':MEASure:JITTer:EWIDth?')

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

Common Measurement Child Queries

This command supports the use of the following common measurement queries: :LOCation?, :COUNt?, :MAXimum?, :MINimum?, :MEAN?, and :SDEViation?.