Agilent Technologies 54503A Podręcznik Użytkownika Strona 54

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54 Chapter2
Making Measurements
Example 1: Resolving Closely Spaced Signals (with Resolution Bandwidth)
Figure 2-3 Bandwidth Shape Factor
Use a 100 kHz resolution bandwidth filter to resolve this third-order
intermodulation distortion product. The 100 kHz filter has a typical
shape factor of 12:1, a 60 dB bandwidth of 1.2 MHz, and a
half-bandwidth value of 600 kHz. This half-bandwidth is narrower than
the frequency separation, so the two input signals will be resolved. See
Figure 2-4.
However, using a 300 kHz filter, the 60 dB bandwidth is 3.6 MHz and
the half-bandwidth value is 1.8 MHz. Since this half-bandwidth is
wider than the frequency separation, the signals most likely would not
be resolved
Change the resolution bandwidth to 300 kHz and notice that you can
no longer see that the distortion product is present. See Figure 2-5
on page 55.
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