Keysight N1911A Programming Manual page 344

9 PSTatistic Subsystem
Error Messages
344
– If no power sensor is connected, error –241 "Hardware missing" occurs.
– If sensor/s connected are not P-Series sensors, error –241 "Hardware
missing" occurs.
– 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 either INT1, INTl2, or EXT, error –221 "Settings conflict" occurs.
N1911A/1912A P-Series Power Meters Programming Guide