Chapter 2 59
Basic Operation
Modulating a Signal
Extending the Frequency Range
You can extend the signal generator frequency range using an Agilent 83550 series millimeter–wave
source module or other manufacturer’s mm–source module. For information on using the signal
generator with a millimeter–wave source module, refer to “Using Agilent Millimeter- Wave Source
Modules” on page 267.
Modulating a Signal
This section describes how to turn on a modulation format, and how to apply it to the RF output.
Turning On a Modulation Format
A modulation format can be turned on prior to or after setting the signal parameters.
1. Access the first menu within the modulation format.
This menu displays a softkey that associates the format’s name with off and on. For example,
AM
> AM Off On
. For some formats, the off/on key may appear in additional menus other than the first
one.
2. Press the modulation format off/on key until On highlights.
Figure 2- 10 shows the portion of the AM modulation format’s first menu that displays the state
of the modulation format, as well as the active modulation format annunciator.
The modulation format generates, but the carrier signal is not modulated until you apply it to the
RF output (see page 60).
Depending on the modulation format, the signal generator may require a few seconds to build the
signal. Within the digital formats (E8267D PSG with Option 601/602 only), you may see a BaseBand
Reconfiguring status bar appear on the display. Once the signal is generated, an annunciator
showing the name of the format appears on the display, indicating that the modulation format is
active. For digital formats (E8267D PSG with Option 601/602 only), the I/Q annunciator appears in
addition to the name of the modulation format.
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