34 5: Configuring Data Displays
2. Press Config Phase Noise.
3. Press Scale Plot.
The highlighted softkeys show whether each axis is auto scaled or in fixed scale mode.
To auto scale an axis, press Auto Scale X Axis or Auto Scale Y Axis.
To manually scale an axis, press one of the following:
• Fixed Scale Y Axis
- Use Shift Up 1 Div and Shift Down 1 Div to shift (scroll) the data up or down
one division on the screen.
- Use Increase dB/Div or Decrease dB/Div to increase or decrease the values
for each division on the plot.
• Scale X-log
- Use Inc Max or Dec Max to increase or decrease the maximum value on the
scale.
- Use Inc Min or Dec Min to increase or decrease the minimum value on the
scale.
• Scale X-linear
- Use Inc Max or Dec Max to increase or decrease the maximum value on the
scale.
If a USB mouse is attached to the test set, the plot can be manually scaled very effectively by
zooming in on a region of interest. This region is designated by dragging a rectangle around it.
To scale the phase noise plot using a mouse:
1. Right-click anywhere on the plot and select Scale > Zoom.
The mouse cursor changes to a cross hair.
Tip: Invoke this function by pressing the ‘Z’ key on a USB keyboard.
Tip: Cancel the zoom operation by clicking the right mouse button. Do so at any point
in this instruction set.
2. Move the mouse to one corner of the region of interest.
3. Press (and hold) the left mouse button.
4. Move the mouse to the opposite corner of the region of interest.
As the mouse is moved, a white rectangle from the original corner to the current
mouse position is continually drawn.
5. Release the left mouse button to zoom in on the selected region.
The phase noise plot is scaled to fit all data in the selected region.
Both the x and the y axis are switched to fixed scale mode.
The fixed scales produced by the zoom feature are subject to the same constraints described above.
The zoom feature cannot scale the x axis below a single decade in logarithmic mode.
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