:MEASure:JITTer:OJITter:JNU

Meas. mode:
Jitter
Package License:
L-RND
Waveform type:
PAM4
Flex Apps:
FlexDCA
EOJ JNU Commands

Command Syntax

:MEASure:JITTer:OJITter:JNU

Query Syntax

:MEASure:JITTer:OJITter:JNU?

Description

Sending the query form of this command returns an Jnu IEEE output jitter measurement result that is displayed in Jitter Mode's Output Jitter panel. The Jnu measurement is made on an RJ/PJ histogram based on a probability. The measurement includes f/2 and uncorrelated data effects. The returned measurement result is for a specific output jitter probability and edge transitions. To select the output jitter for a given probability (J1U, J2U, J3U, J4U, or J5U), use the :MEASure:JITTer:OJITter:SJNU command. To select measurements that are based on a specific the waveform edge (edge category), use the :MEASure:JITTer:JNU:OJITter:ECATegory command.

The default returned measurement is based on all waveform edges.

Before the :MEASure:JITTer:OJITter:JNU command can be used, you turn on all IEEE 12-Edge Output Jitter measurements by sending the :MEASure:JITTer:OJITter:STATe command. Use the :MEASure:JITTer:OJITter:JNU:DISPlay child command expand or contract the results shown in the displayed Output Jitter panel.

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:OJITter:JNU:

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

Child commands for measurement identification:

  • :MEASure:JITTer:OJITter:JNU:SOURce

Requires FlexDCA revision A.05.85 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:OJITter:JNU:STATus?')):
	measurement = Flex.query(':MEASure:JITTer:OJITter:JNU?')

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:OJITter:JNU:COUNt?). The technique uses the :COUNt? common measurement query. For example,

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

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?.