Vector Network Analyzer Measurement Guide : Vector Voltmeter, Option 15 : Getting Started
 
Getting Started
Figure: Vector Voltmeter within VNA Master shows a block diagram comparison of the test configuration for the Vector Voltmeter instrument method (left) and the Vector Network Analyzer (right) when used for an S11 measurement. The Vector Network Analyzer (when equipped with Option 15) contains not only the Vector Voltmeter receiver, but also the signal source and couplers that are necessary for conducting both 1‑port and 2‑port measurements at a selected CW frequency.
Vector Voltmeter within VNA Master
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VNA Master
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Couplers
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Signal Generator
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Vector Voltmeter
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S11 Reflection Measurement
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DUT (Device Under Test)
While phase sensitive cabling is used primarily in lower frequency applications that are typical in air navigation systems such as VOR (VHF Omnirange), the Option 15 software VVM procedures are applicable for the entire frequency coverage of the Vector Network Analyzer
Note 
Disclaimer (an important distinction): The Vector Voltmeter Option 15 in the Anritsu VNA Master and LMR Master does not measure RF voltages. The traditional vector voltmeter function of probing RF voltages (A and B) in two channels, and displaying A, B, A/B, B/A, and the phase difference between them is now obsolete, and those instruments are no longer available. The Vector Network Analyzer has replaced the ratio functions of the vector voltmeters. The Vector Network Analyzer measures those amplitude and phase ratios very accurately. Thus it is a suitable replacement for the most used ratio function of VVMs, that of measuring component parameters.