The DSA832, DSA832E, and DSA875 have a DANL (displayed average noise level) down to -161 dBm (typical). The DSA815 distinguishes between signals with a frequency difference as little as 10 Hz. This would usually be expressed as a VSWR of “1.3”. For example, an antenna may measure 1.3:1 at resonance. ![]() This article discusses how to use the Rigol DSA815 to make this measurement. For example, if an antenna measured a VSWR of 2:1 at a particular frequency, this could indicate an antenna impedance of either 100 or 25 Ohms (the impedance deviated from 50 Ohms by either twice or half). It is generally expressed a a ratio of the measured impedance to 50 Ohms. Voltage Standing Wave Ratio (VSWR) is a measurement of the impedance match of any RF component, subassembly, instrument in reference to a standard 50-Ohm resistive impedance.
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