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LibreVNA manual - generator to signal generator and mode to modes

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Bryan Paradis 2025-02-25 16:46:28 -08:00
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Documentation/UserManual/manual.tex
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@ -1446,7 +1446,7 @@ Certain features are not available when connected to a compound device. To use t
\label{amplitude:calibration}
This section is about calibrating the source output level and spectrum analyzer level. It does not affect VNA measurements at all. For the VNA calibration, see section~\ref{vna:calibration}.
Both the internal signal source and the receiver paths used in the generator or spectrum analyzer mode have no means of ensuring accurate amplitudes (as imperfections are removed by the VNA calibration, the hardware is not optimized for absolute amplitude accuracy). In order to improve the accuracy of both the generator and the spectrum analyzer (especially with enabled tracking generator), frequency dependent amplitude calibrations are available. They are permanently stored in the device and are only required to be performed once. The \textbf{Source Calibration} corrects the ouput of the (tracking) generator, while the \textbf{Receiver Calibration} corrects the measurement of the spectrum analyzer.
Both the internal signal source and the receiver paths used in the signal generator or spectrum analyzer modes have no means of ensuring accurate amplitudes (as imperfections are removed by the VNA calibration, the hardware is not optimized for absolute amplitude accuracy). In order to improve the accuracy of both the generator and the spectrum analyzer (especially with enabled tracking generator), frequency dependent amplitude calibrations are available. They are permanently stored in the device and are only required to be performed once. The \textbf{Source Calibration} corrects the ouput of the (tracking) generator, while the \textbf{Receiver Calibration} corrects the measurement of the spectrum analyzer.
For both calibrations, other test equipment is required, ideally covering the whole range of \SI{1}{\mega\hertz} to \SI{6}{\giga\hertz} (a calibration of only the partial frequeny range is also possible but signals/measurements outside the calibrated range will be inaccurate). The Soure Calibration requires a way to measure the output of the \vna{} (e.g. a spectrum analyzer or power meter), the Receiver Calibration requires a signal source (e.g. a signal generator). Once either calibration has been completed, the \vna{} can also infer the other one with reasonable accuracy.