11 | Keysight | N9038A MXE EMI Receiver Self-Guided Demonstration - Demo Guide
Did you know?
The MXE allows you to set
reference levels, limit lines, traces,
meters, corrections, and more
during scanning. If you didn’t set
the reference level or limit line
appropriately, you can do so without
stopping the scan and the changes
will take effect immediately during
scanning.
Figure 10. Swept trace collected using time domain scan
Step 1—Demo 5 Instructions for MXE Keystrokes
Turn off Trace 2 [Trace/Detector], {Select Trace}, {Trace 2}, {View/Blank}, {Blank}
Set the dwell time to 10 ms [Meas Setup], {Scan Table}, {More 1 of 3}, {Dwell Time}, [1], [0], {ms}
Start the sweep and observe the time
required to cover the frequency span
[Sweep/Control], {Start} or {Clear List And Start}, or just press [Restart]
Stop the scan [Sweep/Control], {Stop}
Change the scan type to time domain scan [Meas Setup], {More 1 of 3}, {Scan Type}, {Time Domain}
Start a new scan with time domain scan type [Restart]
The scan speed of time domain scan type is many times faster than that of smooth or discrete scan
type
Demo 5: Reduce prescan time with time domain scan
The MXE supports three scan types: {Smooth}, {Discrete}, and {Time Domain}. Discrete
scan is the traditional stepped frequency scan. Smooth scan is a swept frequency
scan. It is faster than discrete scan because it doesn’t require retuning the LO for each
frequency point. Time domain scan, while based on stepping LO, is the fastest scan
type. Time domain scan uses overlapped FFT technology to collect data in acquisition
bandwidths that contain multiple resolution bandwidths.
In this demonstration, we are going to demonstrate the advantage time domain scanning
offers for reducing prescan times when using longer dwell times. Commercial test
methodology requires that engineers set the measurement dwell time to the inverse of
the slowest emission pulse repetition frequency from the DUT. In this example we will use
a 10 millisecond dwell time.
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