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E4438C & N5182A do not output signal to rear-panel I/Q ports

Question asked by dzisner on Apr 22, 2012
Latest reply on Apr 25, 2012 by tabbott
I'm using the E4438C as a baseband generator to generate an unmodulated sine wave at baseband frequencies. I expect the signal to be output at the rear-panel I/Q ports but no signal is output. I'm working at a BB frequency (~10MHz) and when I use the RF port, my sine wave is output (I then use a phase shifter to split it to I and Q, but I want to remove the phase shifter from my setup).
When I modulate the signal (using a ARB waveform generator) then I get the correct signal at the I_out and Q_out ports.
Is there anything I need to do in order to enable signal output at the I_out and Q_out ports, or are they reserved only for modulated signals?