Time Domain, Option 2 8-3 VNA Master Implementation
Vector Network Analyzer MG PN: 10580-00289 Rev. K 8-7
The VNA Master (when Domain Processing is set to Auto) always tries to use lowpass
processing whenever the frequency sweep has low frequency content. For band-limited
sweeps with a starting frequency not near DC (such as for waveguide devices), the
VNA Master automatically defaults to bandpass processing.
You can force the instrument to always use bandpass processing as follows: go to
Application Options (press Shift 8 (System), Application Options, Time Domain). In the
Time Domain Options menu, press Domain Processing to select BP Only). For most setups,
however, you should take advantage of lowpass processing whenever possible.
The screen capture in Figure 8-5 shows a DUT with a 6 dB return loss measured in lowpass
time domain mode using an impulse response. A clear 6 dB reflection is shown at
approximately 6 cm from the test port.
Figure 8-5. Low Pass Return Loss Using Impulse Response
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