Keysight EXG and MXG X-Series Signal Generators User’s Guide 339Using Real–Time Fading for N5172B/82B with Option 660 and 653/655/656/657Using Real-Time Fading SoftkeysTo configure a Real-Time Fading simulationWhen configuring a Real-Time Fading simulation, perform the following steps:1. Press Mode2. Press Fading Mode(Default selection is Off.)3. Select either: Off | On | Pass-Through— Selecting Off sets the state of the Real-Time Fading simulation to Off; do not route through theFading path.— Selecting On sets the state of the Real-Time Fading simulation to On; route through the Fadingpath with the Fader in operation. When Real-Time Fading is On, the FADING annunciatorappears in the same annunciator position as ALC OFF. See 3. Annunciators on page 20.— Selecting Pass-Through sets the state of the Real-Time Fading simulation to Pass-Through;route through the Fading path with the Fader having only a latency and scale effect.Before Real-Time Fading can be set to On or Pass-Through, a modulation formatmust be selected and Real-Time Custom Modulation must be set to On; if this isnot done, an Error: -221 Setting Conflict is generated and written to theerror queue.If an error occurs, clear the error queue and turn on a modulation format.To clear the error queue1. Press Error2. Press Clear Error Queue(s).To turn on a modulation format1. Press Mode2. Press Real-Time Custom Modulation3. Press Modulation Setup > Modulation Type and select a modulation type.(Default selection is QPSK.)4. Press Mode > More > Real-Time Custom Modulation and change the selectionto On.(Default selection is Off.)5. Press Mode > Fading Mode(Default selection is Off.)6. Select On or Pass-Through
