Specifications

140 Chapter 7
Measurement Result Processing
Using Marker Function
Using Marker Function
Markers
Turning On/Off Markers
Markers must first be displayed on a specified trace before the marker function can be
used. The E4991A allows you to display up to nine markers (markers 1-8 and a reference
marker) on one trace.
Use the following GPIB command to turn on/off Markers 1-8.
• CALC{1-5}:MARK{1-8} on page 304
Use the following GPIB command to turn on/off the reference marker (Marker R).
• CALC{1-5}:MARK:REF on page 328
The following GPIB command can be used to erase all of the markers on the specified
trace.
• CALC{1-5}:MARK:AOFF on page 305
Setting the Active Marker
When the marker function is performed with the active marker, it is necessary to set the
specified marker to the active marker. If a marker number or the reference marker is not
specified in a GPIB command, the command is usually performed on the active marker.
Use the following GPIB command to set one of markers 1-8 as the active marker.
• CALC{1-5}:MARK{1-8}:ACT on page 305
Use the following GPIB command to set the reference marker as the active marker.
• CALC{1-5}:MARK:REF:ACT on page 329