:MEASure:EYE:CEQ

Instrument
N1000A
N109x
Flex Apps:
FlexDCA
Meas. mode:
Eye
Waveform type:
PAM
Optical
Package License:
L-RND
L-MFG
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 DFE and CTLE FlexDCA Waveform Signal Processing operators. 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?.