Anritsu S113C Guide de l'utilisateur télécharger pdf (Page 98)

Step 11. Repeat steps 8-11 for the remaining spurs. Use either Marker 1 again, or choose

another marker.

Figure 5-17 shows a simulated in-band spur check at 6 MHz from the carrier frequency.

The carrier is measured by M1. The delta marker M3 shows the signal at f

+ 6 MHz to be

73.55 dB down from the carrier. This value should be compared against the specification.

NOTE: The resolution bandwidth of a spectrum analyzer is determined by the

intermediate frequency (IF) filter bandwidth. The Site Master traces the shape

of the IF filter as it sweeps past a signal. Therefore, if two equal-amplitude sig-

nals are very close to each other, the measurement result can appear to be one

single response because the IF or resolution bandwidth is not small enough to

resolve the two signals. Similarly, if two signals are not equal in amplitude but

are very close together, the smaller signal may not be seen because it is hidden

under the large response.

5-26

Chapter 5 Spectrum Analyzer Measurements

Figure 5-17. In-band Spurious Measurement

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Anritsu S113C Guide de l'utilisateur Page 98