:MEASure:JITTer:DEFine:LEVel:TYPe
Meas. mode:
Jitter
Waveform type:
NRZ
PAM4
Flex Apps:
FlexDCA
Command Syntax
:MEASure:JITTer:DEFine:LEVel:TYPe {ECENter | PERCent | UNITs | AVERage}
Query Syntax
:MEASure:JITTer:DEFine:LEVel:TYPe?
Description
For NRZ and PAM4 waveforms, this command specifies a jitter sampling level based on percent, amplitude units, average, or eye center. The default setting is percent.
PERCent
- Jitter sampling level as a percent of Unit Interval (UI). For NRZ signals, this is the value for the single eye. For PAM4 signals, you can individually specify the percentage that is used for each of the three eyes. Use the
:MEASure:JITTer:DEFine:LEVel:PERCent:EYE
command to set the actual value between 30% and 70%.PERCent
is the default setting. - When this argument is selected, you can also specify an amplitude location (in percent) at which to perform the measurement. For NRZ signals, use the
MEASure:AMPLitude:DEFine:LOCation:PERCent:LEVel
command. For PAM4 signals, use the:MEASure:AMPLitude:DEFine:LOCation:TYPE
command. UNITs
- Jitter sampling level based on custom amplitude values. For NRZ signals, this is the value for the single eye. For PAM4 signals, you can individually specify the amplitude that is used for each of the three eyes. The units are Watts or volts based on the optical or electrical input channel used. Use
:MEASure:JITTer:DEFine:LEVel:CUSTom:EYE
to enter the desired level. If you enter a custom level that is outside of the equivalent 30% to 70% range for the signal being measured, the measurement graphs are not displayed. - When this argument is selected, you can also specify an amplitude location at which to perform the measurement. For NRZ signals, use the
MEASure:AMPLitude:DEFine:LOCation:PERCent:LEVel
command. For PAM4 signals, use the:MEASure:AMPLitude:DEFine:LOCation:TYPE
command. ECENter
- On PAM4 signals, jitter sampling level is based on the eye centers. Use
:MEASure:JITTer:DEFine:THReshold:ECDefinition
to define the center of the eye. Use:MEASure:JITTer:DEFine:THReshold:ESTiming
to define the timing of the receiver's sampling. Use:MEASure:JITTer:DEFine:THReshold:PROBability
to define the probability used to identify the eye. Do not use this argument for NRZ signals. TheECENter
argument was introduced in FlexDCA revision A.05.60. - When this argument is selected, the amplitude location is the center of the eye and cannot be changed.
AVERage
- On NRZ signals, jitter sampling level is based on an average and cannot be adjusted. Do not use this argument for PAM4 signals.
- When this argument is selected, you can also specify an amplitude location (in percent) at which to perform the measurement using the
:MEASure:AMPLitude:DEFine:LOCation:PERCent:LEVel
command.
In addition to specifying the jitter sampling level and amplitude location, you can also set the width of the window that is used to calculate eye height and the minimum RMS location. Use the :MEASure:JITTer:DEFine:LWIDth
command.
Sample Level Set to the Default 50% Level

Sample Level Changed to a 30% Level

Common Parameter Child Commands
This command supports the use of the following common parameter child commands: :DEFault
, :NEXT
, :PREVious
, and :VSET?
.
Example Command Sequence
:CHAN5B:SIGNal:TYPE:AUTO OFF :CHAN5B:SIGNal:TYPE PAM4 :SYSTem:MODE JITTer;*OPC? :MEASure:JITTer:DEFine:LEVel:TYPe PERCent :MEASure:JITTer:DEFine:LEVel:PERCent:EYE2 8.000E+1 :MEASure:JITTer:DEFine:LEVel:PERCent:EYE1 5.000E+1 :MEASure:JITTer:DEFine:LEVel:PERCent:EYE0 2.000E+1 :MEASure:AMPLitude:DEFine:LOCation:TYPE MRMS :MEASure:JITTer:DEFine:LWIDth PERCent :MEASure:JITTer:DEFine:LWIDth:PERCent 8.0 :MEASure:AMPLitude:EHEight?