122 Chapter 2 
Front-Panel Key Reference
Marker
Off Turns off the marker that has been selected by the Select Marker 1 2 3 4 
key. 
Off also turns off functions related to the selected marker such as 
signal track and demodulation. It also removes marker annotation from 
the display. 
Key Access: 
Marker 
Select Marker 
1 2 3 4
Selects one of the four possible markers. A marker that has already 
been turned on will become active when it is selected. If a marker has 
already been turned on and assigned to a specific trace, it will become 
active on that trace if that marker is selected.
Key Access: 
Marker, More 
Marker Trace 
Auto 1 2 3
Assigns a marker to a trace. Pressing Marker Trace Auto 1 2 3 will 
activate a marker on trace 1 if there are no markers turned on. If a 
marker is currently active, press 
Marker Trace Auto 1 2 3 until 1, 2, or 3 is 
underlined. The active marker will be moved to the selected trace. 
Selecting the 
Auto mode will move the marker to the trace that is 
automatically selected. The selection order is to look for the lowest 
numbered trace in the following order of trace modes: clear-write, 
max- hold, min-hold, view-mode. If there are no traces in any of these 
modes, it selects trace 1.
 Key Access:
Marker, More
Readout
Accesses the following menu keys that allow you to change the active 
marker readout. 
Key Access: 
Marker, More
Frequency
  Sets the marker to Frequency. The default selection in 
non-zero spans, displays the absolute frequency of a 
normal marker or the frequency of the delta marker 
relative to the reference marker. 
Key Access: 
Marker, More, Readout
Period
  Sets the marker readout to Period. Displays the 
reciprocal of the above frequency.
Key Access: 
Marker, More, Readout
Time
  Sets the marker readout to Time. The default selection 
in zero span, displays the time interval between a 
normal marker and the start of the sweep or the time of 
the delta marker relative to the reference marker. 
Key Access: 
Marker, More, Readout
Inverse Time
  Sets the marker readout to Inverse Time. Displays the 
reciprocal of the above time interval.
Key Access: 
Marker, More, Readout