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What does Error Code 18 on the 8970B Noise Figure Analyzer Indicate?

The Keysight 8970B/71B/71C Noise Figure Measurement Operating Manual specifies the error code as: "Frequency calibration failed".

"8970B Error Code 18" most often requires service level attention to rectify. As a preliminary step, attempt to reset the 8970B via the key sequence 0.9 SP ENTER. If the error persists, then the unit requires service level adjustment, alignment, and/or repair.

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