:MEASure:EYE:CEQ

Instrument mode:
Eye
Waveform type:
PAM4
Waveform record:
MV
Package License:
L-RND
L-MFG
L-SNT
Flex Apps:
FlexDCA
FlexRT
PAM Ceq Commands

Command Syntax

:MEASure:EYE:CEQ

Query Syntax

:MEASure:EYE:CEQ?

Description

The Eye mode PAM Ceq measurement measures the noise gain introduced by the following FlexDCA Waveform Signal Processing operators:

  • DFE
  • CTLE

Although the Ceq measurement is defined by the standard for TDECQ measurements, it can be used with any of the operators that are listed above. Ceq is expressed as:

Requires FlexDCA revision A.06.00 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:CEQ:

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

Example Command Sequence

:TRIGger:PLOCk ON;*OPC?
:FUNCtion2:FOPerator TEQualizer
:FUNCtion2:DISPlay ON
:MEASure:EYE:CEQ:SOURce1 FUNCtion2
:MEASure:EYE:CEQ

Measurement Ready?

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

if ('CORR' in Flex.query(':MEASure:EYE:CEQ:STATus?')):
	measurement = Flex.query(':MEASure:EYE:CEQ?')

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:EYE:CEQ:COUNt?). The technique uses the :COUNt? common measurement query. For example,

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

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?.