Technical data

500 Agilent Infiniium 9000 Series Oscilloscopes Programmer's Reference
25 Measure Commands
:MEASure:CGRade:EWIDth
Command :MEASure:CGRade:EWIDth <algorithm>
The :MEASure:CGRade:EWIDth command enables the eye width
measurement on the current eye pattern. Before using this command or
query, you must use the :DISPlay:CGRade command to enable the color
grade persistence feature. Also, there must be a full eye diagram on screen
before a valid measurement can be made.
<algorithm> {MEASured | EXTRapolated} EXTRapolated is optional because it is the
default if you do not specify an algorithm.
MEASured will measure the eye width within the window (see
CGRade:EWINdow) of the current data. The smallest eye width is reported.
Extrapolated will estimate the eye width based upon the mean and
standard deviation of the crossings.
Example This example measures the eye width.
myScope.WriteString ":MEASURE:CGRADE:EWIDTH"
Query :MEASure:CGRade:EWIDth?
The :MEASure:CGRade:EWIDth? query returns the eye width measurement
of the color grade display. Before using this command or query, you must
use the :DISPlay:CGRade command to enable the color grade persistence
feature.
Returned Format
[:MEASure:CGRade:EWIDth]<value>[,<result_state>]<NL>
<value> The eye width.
<result_state> If SENDVALID is ON, the result state is returned with the measurement
result. Refer to the MEASure:RESults command, for a list of the result
states.
Example This example places the current eye width in the numeric variable,
varValue, then prints the contents of the variable to the computer's screen.
myScope.WriteString ":SYSTEM:HEADER OFF" ' Response headers off.
myScope.WriteString ":MEASURE:CGRADE:EWIDTH?"
varValue = myScope.ReadNumber
Debug.Print FormatNumber(varValue, 0)