Agilent Technologies N1911A Programming Manual page 422

10 SENSe Subsystem
• If the CSET1 command is used when a P- Series or an E- Series power
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offset table is selected, the power meter verifies that the number of
offset points defined is equal to the number of frequency points
defined. If this is not the case, error –226, "Lists not the same length"
occurs.
sensor is connected the error –241, "Hardware missing" occurs.
N1911A/1912A P-Series Power Meters Programming Guide