Keysight N1911A Programming Manual page 355

Error Messages
– If no power sensor is connected, error –241 "Hardware missing" occurs.
– If sensor/sensors connected are not P-Series sensors, error –241 "Hardware
– If measurement speed setting is FAST, error –221 "Settings conflict" occurs.
– If the acquisition mode is in continuous triggering or triggering source is set to
N1911A/1912A P-Series Power Meters Programming Guide
missing" occurs.
either INT1, INT2, or EXT, error –221 "Settings conflict" occurs.
PSTatistic Subsystem 9
355