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Chapter 12 155
Noise Figure Measurement Application
General Specifications
e. Noise figure measurements can be made in this range but will often be poor because of the lack of
availability of built-in preamplification. For high gain DUTs or with the use of an external preamplifier,
this problem can be overcome. In such cases, the Instrument Uncertainty for NF will nominally be the
same in this frequency range as listed above. Note, however, that Instrument Uncertainty for Gain is
also a contributor (as computed by the Uncertainty Calculator) to the total Noise Figure uncertainty. IU
for Gain is higher in this frequency range than in other ranges. IU for Gain is a small contributor when
the output noise of the DUT is much higher than the input noise of the next stage.