:MEASure:JITTer:JN

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

Command Syntax

:MEASure:JITTer:JN

Query Syntax

:MEASure:JITTer:JN?

Description

The command query returns the measured J1, J2, J3, J4, J5, J6, J7, J8, or J9 based on the value specified with the :MEASure:JITTer:JN:SJN child command. JN measures the total jitter associated with a specific symbol error ratio (BER) as noted in the :MEASure:JITTer:JN:SJN child command. For NRZ measurements, moves the JN measurement to the top of the Jitter table. Displays the measurement if it is not already shown on the table. The query form of the command returns the measured value. To selects the eye in the PAM4 eye diagram on which to return the measurement, use the :MEASURE:JITTer:JN:EYE command.

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:JN:

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

Child commands for measurement identification:

  • :MEASure:JITTer:JN:SOURce
  • :MEASure:JITTer:JN:SJN

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:JN:STATus?')):
	measurement = Flex.query(':MEASure:JITTer:JN?')

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

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

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 Sequence

:SYSTem:MODE JITTer
:MEASure:JITTer:JN:SOURce CHAN1A
:MEASure:JITTer:JN:SJN J2
:MEASure:JITTer:JN?