HP 54620A, User'S And Service Manual

Page: 84 / 243

To change the time reference position
1
Press
Main/Delayed
.
2
Choose the time reference position from the
Time Reference
softkeys:
•
To set the time reference so that most of the acquired data follows the
trigger, press the
Left
softkey.
The time reference indicator will be one division in from the left side
of the display. The trigger event will be at the same location unless the
delay is set to a value other than 0.
•
To set the time reference so that the acquired data is centered around the
trigger, press the
Center
softkey.
The time reference indicator will be at the middle of the display. The
trigger event will be at the same location unless the delay is set to a
value other than 0.
•
To set the time reference so that most of the acquired data precedes the
trigger, press the
Right
softkey.
The time reference indicator will be one division in from the right side
of the display. The trigger event will be at the same location unless the
delay is set to a value other than 0.
The time reference position sets the initial position of the trigger event within
acquisition memory and on the display, with delay set to 0. The delay setting
sets the specific location of the trigger event with respect to the time
reference position. The time reference setting affects the delayed sweep as
described in the following ways.
The point about which the delayed sweep is expanded changes (as Time/Div
is varied):
•
For a time reference setting of Left, the sweep expands from the
left-hand side of the display.
•
For a time reference setting of Center, the sweep expands about the
center of the display.
•
For a time reference setting of Right, the sweep expands from the
right-hand side of the display.
Making Analyzer Measurements
To change the time reference position
83