E4990A Help
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Using Relative Limit Line
If the shape is more important than the amplitude, you can make the limit
lines relative to the peak point of the trace using the reference tracking
function.
In this function, the point to be tracked is set as the Y-axis reference value
by offsetting measurement values after the sweep. Because measurement
values are offset, marker values and limit test evaluation results change
accordingly.
1. Press Channel Next (or Channel Prev) and Trace Next (or Trace Prev)
to select the channel/trace.
2. Press Scale > Reference Tracking.
3. When you want to specify a measurement value at a frequency as
the Y-axis reference value for tracking, press Track Frequency, then
enter the frequency.
4. Press Tracking to select a tracking method as below.
Softkey Function
Track
Peak
Sets the peak value after the sweep as the reference
value.
Track
Freq
Sets a measurement value at a specified frequency as
the reference value.
5. PTrk (Track Peak) or FTrk (Frequency) is displayed at the trace
status area.
This function is available even when the limit test function
is off.
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