Keysight E4990A - Page 94

E4990A Help
84
Softkey Function
Marker
Zoom
Substitutes the sweep parameter value at the main
marker on the current active trace (A or B) into the
sweep center value and simultaneously changes the
current sweep span value to the sweep span value
specified with the Zooming Aperture. In other words, the
sweep range is changed so that the marker position is
the new sweep center value and the sweep span is
magnified by the amount specified with the Zooming
Aperture.
Zooming
Aperture
Sets the zooming aperture (ratio of the new sweep span
value to the current sweep span value) used when the
Marker Zoom is executed as a percentage.
The current active marker position is set as the new
sweep center value, and the new sweep span value is
set depending on the specified zooming aperture. As a
result, the trace will be magnified (zoomed in) by
focusing on the main marker position.
For the ratio of the new sweep span value to the current
sweep span value (%), you can set a value between 0.01% and
100% in steps of 0.01%. The default value of power-on and preset
state is 10%.
Using Time as Sweep Parameter (Zero Span Sweep)
Setting the sweep span to zero allows you to perform a measurement with
time as a sweep parameter. This kind of sweep is also called zero span
sweep. The following procedure allows you to time sweep and the
measurement parameter is displayed versus time.
1. Press Span > 0 > x1 to set the span value to 0 (zero span).
2. Press Center, then input the desired value (frequency, power, or DC
bias).
3. Press Sweep Setup > Sweep Time, then input the duration of the
sweep which is displayed on X-axis.
4. Press Marker to display the marker 1. The time at the marker shows
as the marker position value at the upper left corner on the screen.
Setting Number of Points (NOP)
1. Press Sweep Setup to display the Sweep Setup menu.
2. Press Points and input the desired number of points.