Measurements
What Should I Do if the Device Amplitude Reading Does Not
Match the Source?
1.
Verify that the discrepancy between the PXIe-5668 and the source is within the error
limits of the devices.
a)
Verify the absolute amplitude accuracy of the PXIe-5668 using the appropriate
value.
b)
Verify the level accuracy of the input signal into the receiver.
2.
Check for cable loss, which can be substantial. For example, an 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.
Perform a self-calibration for the PXIe-5668.
If errors continue, contact NI technical support or visit
.
PXIe-5668 Getting Started Guide
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© National Instruments
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