Anritsu AWGN MU368060A - Manual (Page 53)

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MODE
I/Q Source
Function Selects between internal generation or external input for the I/Q
signal.
Command message MODE a
Value of a INT : Internal (Internal I/Q signal)
EXT : External (External I/Q signal)
OFF : I/Q modulation stops (Only pulse modulation is available.)
Query message MODE?
Response message MODE a
Application example MODE EXT