:MEASure:PLEVel:SERRor

Meas. mode:
Jitter
Package License:
L-RND
L-MFG
Waveform type:
PAM4
Flex Apps:
FlexDCA
PAM Level Panel Commands
PAM Sigma-E Commands

Command Syntax

:MEASure:PLEVel:SERRor

Query Syntax

:MEASure:PLEVel:SERRor?

Query Response

Description

For the Signal-to-Noise-and-Distortion Ratio (SNDR) measurement, returns the measured Sigma E (σe rms) term which is the standard deviation of error (distortion). To run the SNDR measurement, use the :MEASure:PLEVel:SNDRatio.

Sigma E is rms value of the σe term shown in the following equation for SNDR.

You can run and return the Sigma-E measurement even it the Signal-to-Noise-and-Distortion Ratio (SNDR) measurement is not running or displayed int FlexDCA's Level results table.

Requires FlexDCA revision A.07.90 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:PLEVel:SERRor:

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

Measurement Ready?

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

if ('CORR' in Flex.query(':MEASure:PLEVel:SERRor:STATus?')):
	measurement = Flex.query(':MEASure:PLEVel:SERRor?')

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:PLEVel:SERRor:COUNt?). The technique uses the :COUNt? common measurement query. For example,

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

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?.

Example Command

:MEASure:PLEVel:SERRor