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How do I perform a User Calibration when utilizing a Keysight R347B or Q347B Noise Source with the N8975A Noise Figure Analyzer?

User calibration requires a second noise source as the operating frequency range for the R347B and Q347B is above the maximum input frequency for the N8975A. When measuring a frequency converting device the N8975A User Calibration takes place at a different frequency from the actual measurement.

R347B_example.gif

For the measurement shown above the N8975A User Calibration takes place at 12GHz which is within the operating range of a 346x, or N400xA, series noise source. First calibrate the system using a 346x or N400xA series noise source with its ENR values loaded into the CAL TABLE. When user calibration is complete the device under test can be measured utilizing the R347B or Q347B with its ENR values loaded into the MEAS TABLE.