:MEASure:EYE:PAM:EWIDth
Command Syntax
:MEASure:EYE:PAM:EWIDth
Query Syntax
:MEASure:EYE:PAM:EWIDth?
Description
Returns the PAM Eye Width measurement. Eye Width measures the horizontal opening for the selected eye of a PAM signal. Select the eye measurement to be returned using the :MEASure:EYE:PAM:EWIDth:EYE child command. To measure the eye width for all of the eyes on a PAM signal, you must send this command once for each eye as there is no command for simultaneously measuring all eyes.
For each eye, the eye width is derived from eye boundaries that are located based on zero data "hits" or at an eye opening probability (:MEASure:EYE:PAM:EWIDth:DEFine:EOPening child command). The probability defines the ratio of total hits in a waveform database column that can occur in the eye's opening. The probability can be set from 1 x 10–1 to 1 x 10–9 using the :MEASure:EYE:PAM:EWIDth:DEFine:EOPening:PROBability child command. The default probability is 1 x 10–2. No extrapolation is used to determine Eye Widths at a specified probability.
Specify the measurement units with the :MEASure:PAM:EYE:TIME:UNITs command.
Related Commands
| Command | Equivalent Setting in PAM-N Analysis Setup Dialog Box |
Description |
|---|---|---|
:MEASure:PAM:EYE:ESTiming
|
Receiver Sample Timing | Configures the timing for sampling the signal data for all PAM measurements. |
:MEASure:PAM:EYE:ELMethod
|
Eye Center Location | Selects the basis for determining the location of an eye's center on the waveform: at maximum eye width or maximum eye height. |
:MEASure:PAM:EYE:TIME:UNITs
|
Time Units | Sets the time units for measurement: seconds or unit intervals. |
This measurement can be applied to both NRZ eye and PAM eye diagrams.
Example Command Sequence
:MEASure:EYE:PAM:EWIDth:SOURce ECHannel1_1 :MEASure:PAM:EYE:TIME:UNITs SECond :MEASure:EYE:PAM:EWIDth:DEFine:EOPening ZHITs :MEASure:EYE:PAM:EWIDth:EYE EYE2 :MEASure:EYE:PAM:EWIDth :MEASure:EYE:PAM:EWIDth?