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Operation
Operating Hints
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.
Chapter 3
57
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