54 Keysight EXG and MXG X-Series Signal Generators User’s GuideBasic OperationModulating the Carrier SignalModulating the Carrier SignalTo modulate the carrier signal, you must have both— an active modulation formatand— modulation of the RF output enabledExample1. Preset the signal generator.2. Turn on AM: Press AM > AM Off On (requires Option UNT).You can turn on the modulation format before or after setting signal parameters.The modulation format generates, but does not yet modulate the carrier signal.Once the signal generates, an annunciator showing the name of the format appears, indicatingthat a modulation format is active.3. Enable modulation of the RF output: Press the Mod On/Off key until the LED lights.If you enable modulation without an active modulation format, the carrier signal does notmodulate until you subsequently turn on a modulation format.4. To make the modulated carrier available at the RF output connector, press the RF On/Off keyuntil the LED lights.To turn modulation off, press the Mod On/Off key until the LED turns off.When the Mod On/Off key is off, the carrier signal is not modulated, evenwith an active modulation format.See also: “Analog Modulation (Option UNT)” on page 159“Pulse Modulation (Options UNW and 320)” on page 169“I/Q Modulation” on page 245Annunciator indicates active AM modulationAM format onA lit LED indicates that any activemodulation format can modulatethe carrier.
