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National Instruments Corporation
23
NI PXI-5660 Getting Started Guide
Measurements
For more information about making measurements with the RF vector signal analyzer, refer to the
NI PXI-5660 Help
.
RF Vector Signal Analyzer Amplitude Reading Does Not Match Source
If the RF vector signal analyzer reports an incorrect amplitude reading, check for the following possible
errors:
1.
Check that the discrepancy between the RF vector signal analyzer and the source is within the error
limits of the devices, as follows:
a.
Verify the absolute amplitude accuracy of the RF vector signal analyzer.
b.
Verify the output level accuracy of the source.
2.
Check for loss in the cables, which can be substantial. For example, RG58 coaxial cable loses about
2.1 dB of signal amplitude per foot at 2 GHz. Unless you are using high-quality cables, expect
losses when working with high-frequency signals.
3.
Ensure that you are using the amplitude calibration functions in the NI Spectral Measurements
Toolkit. Failure to apply calibration functions can result in large amplitude errors.
4.
If errors continue, contact NI technical support or visit
ni.com/support
.
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