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Noise Figure Mode (Option 356)
Calibration Wizard
independent of the receiver bandwidth from the receiver calibration. The
receiver calibration has virtually no influence on the noise figure
measurement, either with or without a user calibration. The receiver
calibration only effects the gain measurement, and only when there is no user
calibration.
As already stated, the receiver calibration measures the measurement
bandwidth of the receiver. In most cases, this is set primarily by the digital
processing of the receiver. The receiver calibration is needed, because it is
influenced by the IF analog circuitry of the FieldFox. Additionally, the
bandwidth is extremely stable, and does not vary significantly with time or
temperature. So, once the receiver calibration has been successfully
performed there is no need to repeat the receiver calibration.
Exceptions: Re-do the receiver calibration when the FieldFox receiver
hardware is changed (factory repair) or in the rare case where a filter is added
to the measurement system which has a narrower bandwidth than the
receiver (i.e., the external bandwidth is less than the lowest resolution
bandwidth (Res BW) setting of 300 kHz).
For example of Smart Noise Source Receiver Cal, refer to
Figure 29-27 on
page
720.
Keysight N9915-90020 User's Guide
719
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