Basic Operation

Modulating a Signal

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 2-11shows 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 51).

Depending on the modulation format, the signal generator may require a few seconds to build the signal. Within the digital formats (E8267C PSG with Option 002/602 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 (E8267C PSG with Option 002/602 only), the I/Q annunciator appears in addition to the name of the modulation format.

Figure 2-11

Example of AM Modulation Format Off and On

First AM Menu

Modulation format is off

Active Modulation Format Annunciator

Modulation format is on

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Chapter 2

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Agilent Technologies E8267C PSG, E8247C PSG CW, E8257C PSG manual Modulating a Signal, Turning On a Modulation Format

E8267C PSG, E8247C PSG CW, E8257C PSG specifications

Agilent Technologies, a leading provider of electronic test and measurement equipment, offers a range of signal generators that are pivotal in various applications, including telecommunications, aerospace, and research. Among their top-tier offerings are the E8257C PSG, E8247C PSG CW, and E8267C PSG. These signal generators are known for their exceptional performance, flexibility, and cutting-edge technologies.

The E8257C PSG is a high-performance microwave signal generator capable of generating signals from 10 MHz to 40 GHz. Its versatility makes it ideal for applications such as radar and satellite communications. One of the standout features of the E8257C is its low phase noise and superior output power, which ensure high-quality signal generation. The instrument incorporates advanced digital signal processing technology, allowing users to create complex modulated signals with precision. It also boasts a comprehensive set of modulation formats, including AM, FM, PM, and pulse modulation, making it suitable for diverse testing scenarios.

The E8247C PSG CW is designed specifically for continuous wave (CW) applications, covering frequencies from 500 kHz to 20 GHz. This generator is optimized for high stability and low output noise, making it ideal for applications that require a reliable signal source, such as manufacturing testing and maintenance of communication systems. The E8247C features a compact design and is equipped with an intuitive user interface, allowing quick access to essential functions. Its frequency agility and fast switching capabilities enhance productivity, enabling engineers to optimize their workflow.

The E8267C PSG delivers unparalleled performance in the microwave frequency range of 250 kHz to 70 GHz. It includes advanced modulation capabilities, allowing users to generate complex waveforms with relative ease. The E8267C supports various digital modulation schemes, including QAM, which is crucial for testing modern communication systems. Its high output power and excellent spectral purity make it suitable for both R&D and manufacturing applications. Additionally, the E8267C features built-in functionality for frequency and power sweeps, providing users with extensive testing options.

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