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Measurements and Results

R&S

FSW

355User Manual 1173.9411.02 ─ 43

Evaluating the measurement

Check the Result Summary to detect exceeded limit values.

Zoom into the diagram at the conspicuous frequency for more details.

If necessary, decrease the span to the area in which irregular values occurred and

repeat the measurement.

7.13.8 Optimizing and Troubleshooting EMI Measurements

If the results do not meet your expectations, try the following methods to optimize the

measurement:

Number of sweep points

The resolution bandwidth should cover at least one sweep point (more is better). If this

condition is not met, signals or interferences could be missed during refined measure-

ment of narrowband interferers. See Chapter 7.13.3.3, "Frequency Resolution - Sweep

Points and Scaling", on page 338.

If the distance between two sweep points is larger than RBW/3, a warning is displayed

in the status bar ("Increase Sweep Points" or "RBW").

Dwell time

Consider the following when defining the dwell time:

●

Unknown signals: select a dwell time of at least 1 second to ensure that pulses

down to a frequency of 5 Hz are weighted correctly

●

Pulsed signals or signals that fluctuate slowly: the dwell time must cover at

least the time until the first signal peak is measured; can require long dwell time

●

unmodulated signals or signals with a high modulation frequency: the dwell

time must cover at least the time until the first signal peak is measured; usually

shorter than for pulsed signals

Electromagnetic Interference (EMI) Measurement

R&S FSW Series User Manual

Questions and Answers: