To Locate A Specific Constellation Point - Agilent Technologies 89410A Operator's Manual

Analyzing Digitally Demodulated Signals (Options AYA and AYH)

To locate a specific constellation point

You now use the offset marker as a pointer to snap the main marker to a
constellation point. This is more convenient than searching linearly
through time in order to position the main marker on a desired
constellation point. This task is a continuation of the previous task.
1.
Turn on the offset marker, and place it on the main marker:
Press [ ], [
Shift Marker→
2.
Move the offset marker close to the desired point:
Press [ ], [
Marker offset posn setup
Rotate the knob counterclockwise until the x position reads approximately
690m.
3.
Snap the main marker to the constellation point closest to the offset marker:
Press [ ], [
Marker Search
4.
Enhance the brightness of the crosshairs identifying the optimal constellation
point:
Press [ ], [
Display more display setup
Press [ ], 60, [
luminosity
This change remains in effect for all trace grids until you return the
luminosity back to 48% using the same procedure.
5.
Before proceeding to later tasks, return to previous display and measurement
conditions:
Press [ ]
Auto Scale
Press [ ]
Pause|Single
Press [ ]
Marker|Entry
The offset marker lets you place the marker on a specific constellation point
10 - 6
].
], [ ]
offset x posn
].
marker to offset mkr
], [ ], [
color setup
].
%
], 7, [ ]
color index enter