Agilent Technologies HP 70910A Podręcznik Użytkownika Pobierz pdf (Strona 57)

Chapter 3 57

Operation

Operating Hints

Operation

RF Port Voltage Standing Wave Ratio (VSWR) Effects

As with most bandpass filters, the magnetically tunable Barrium-Ferrite bandpass filter of

the 11974 is reflective out of its passband. In addition, the 11974 does not have a

programmable RF port attenuator to improve the VSWR in band or out of band. This may

cause measurement errors when testing VSWR sensitive DUTs outside of their operating

frequency range. One measurement example in which VSWR effects should be minimized

is when searching for spurious signals in an oscillator. To improve the accuracy of the

measurement, use an 365 Series waveguide isolator (included in Option 001) or an

attenuator at the RF port of the 11974 to reduce this particular VSWR effect.

Dynamic Range Optimization

An attenuator at the RF port of the 11974 can be used to set the RF input power level for

maximum dynamic range, approximately

−30 dBm, as shown in Figure 1-3 on page 23,

Figure 1-2 on page 12, Figure 3-5. on page 59, and Figure 1-6 on page 26.

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Agilent Technologies HP 70910A Podręcznik Użytkownika Strona 57