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Topic: TDR and vector network analyzer difference
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TDR measurements have typically been done on TDR modular enabled Oscilloscopes but now vector network analyzer are gaining attention as an alternative method for TDR. How do the tests differ?
digitalJunk on 1/27/2011 11:39:00 PM

Re: TDR and vector network analyzer differenceBest Answer!
Vector Network analyzers (VNA) such as the E5071C offer unigue features that are not available in traditional TDR scopes such as the 86100C with the TDR module (54754A). This TDR scope solution launches a fast edge into the device under test (DUT) and directly sample the voltage to reconstruct a waveform in time domain. This echo technique is straightforward, but the measurement accuracy is low.

The E5071C VNA launches sinusoid and measure vector ratios of incident and reflected voltage.The frequency of the sinusoid is swept to provide the response of DUTs as functions of frequency. Since VNAs have wider dynamic range compared to TDR oscilloscopes, more accurate measurements can be made. In VNA based TDR measurements, the measured frequency response is converted into a time response by computing inverse fast Fourier transform.
Crankshaft on 1/28/2011 1:43:00 PM

Total Replies: 1 Reply To This Topic

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