From a6f4d39f8318de9e91a229baf7879b5ff0166b53 Mon Sep 17 00:00:00 2001 From: Bryan Paradis Date: Tue, 25 Feb 2025 17:08:13 -0800 Subject: [PATCH] LibreVNA manual - They to These calibrations for clarity --- Documentation/UserManual/manual.tex | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/Documentation/UserManual/manual.tex b/Documentation/UserManual/manual.tex index 3ede34a..49ac3c3 100644 --- a/Documentation/UserManual/manual.tex +++ b/Documentation/UserManual/manual.tex @@ -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 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). Frequency dependent amplitude calibrations are available in order to improve the accuracy of both the signal generator and the spectrum analyzer (especially when the tracking generator option is enabled in the spectrum analyzer). 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). Frequency dependent amplitude calibrations are available in order to improve the accuracy of both the signal generator and the spectrum analyzer (especially when the tracking generator option is enabled in the spectrum analyzer). These calibrations 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.