Basic Operation

Configuring the RF Output

NOTE List sweep data cannot be saved within an instrument state, but can be saved to the memory catalog. For instructions on saving list sweep data, see “Storing Files to the Memory Catalog” on page 56.

During swept RF output, the FREQUENCY and AMPLITUDE areas of the signal generator’s display are deactivated, depending on what is being swept.

Step sweep (see page 39) and ramp sweep (see page 41) provide a linear progression through the start- to- stop frequency and/or amplitude values, while list sweep enables you to create a list of arbitrary frequency, amplitude, and dwell time values and sweep the RF output based on that list.

The list sweep example uses the points created in the step sweep example as the basis for a new list sweep.

Ramp sweep (see page 43) is faster than step or list sweep, and is designed to work with an 8757D Scalar Network Analyzer.

The signal generator provides a softkey, Sweep Retrace Off On, that lets you configure single sweep behavior. When sweep retrace is on, the signal generator will retrace the sweep to the first point of the sweep. If the sweep retrace is off, the sweep will stop and remain on the last point in the sweep.

Activating Scalar Pulse in Sweep Configurations

If your sweep setup uses a scalar network analyzer and a DC detector, the PSG must modulate the swept signal with a 27 kHz square wave, also referred to as a scalar pulse. This pulse modulation is necessary for the DC detector to properly detect the swept signal. If the PSG is controlled by an 8757D through a GPIB connection, the scalar pulse automatically turns on when DC detection is selected on the 8757D. When using any other scalar analyzer, you can manually turn on the scalar pulse using either one of the following key- press sequences:

Press Sweep/List > Sweep Type > Scalar Pulse Off On to On or

Press Pulse > Pulse Source > Scalar > Pulse Off On to On

Using Step Sweep

Step sweep provides a linear progression through the start- to- stop frequency and/or amplitude values. You can toggle the direction of the sweep, up or down. When the Sweep Direction Down Up softkey is set to Up, values are swept from the start amplitude/frequency to the stop amplitude/frequency. When set to Down, values are swept from the stop amplitude/frequency to the start amplitude/frequency.

When a step sweep is activated, the signal generator sweeps the RF output based on the values entered for RF output start and stop frequencies and amplitudes, a number of equally spaced points (steps) to dwell upon, and the amount of dwell time at each point; dwell time is the minimum period of time after the settling time that the signal generator will remain at its current state. The frequency, amplitude, or frequency and amplitude of the RF output will sweep from the start amplitude/frequency to the stop amplitude/frequency, dwelling at equally spaced intervals defined by the # Points softkey value.

Chapter 2

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Agilent Technologies E8257D PSG, E8267D PSG manual Activating Scalar Pulse in Sweep Configurations, Using Step Sweep
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E8267D PSG, E8257D PSG specifications

Agilent Technologies, a recognized leader in electronic measurement and communications solutions, offers a comprehensive range of signal generators, including the E8257D PSG (Pulsed Signal Generator) and E8267D PSG. These instruments are engineered to meet the demanding requirements of wireless communication, aerospace, defense, and various research applications.

The E8257D PSG is known for its versatility and reliability. It operates within a frequency range of 250 kHz to 40 GHz, making it suitable for a wide array of applications, from signal generation to vector modulation. With an output power capability of up to +30 dBm, it delivers high-quality signals with exceptional precision. Its low phase noise performance is especially critical for applications such as radar and communication system testing, where signal integrity is paramount.

One of the standout features of the E8257D is its advanced modulation capabilities, including analog and digital modulation schemes. This flexibility allows engineers to simulate real-world communications environments accurately. The PSG also features a built-in arbitrary waveform generator that enables users to create complex waveforms tailored to specific testing needs, providing a significant advantage in research and development.

On the other hand, the Agilent E8267D PSG is designed to cater to the needs of users requiring a combined signal generation and analysis solution. With the capability to generate signals from 250 kHz to 67 GHz, the E8267D is ideal for millimeter-wave applications, as well as testing next-generation wireless technologies.

This model includes features such as enhanced phase noise performance and faster switching speed, which are crucial for signal integrity in sophisticated networks. The instrument's intuitive user interface and powerful software integration facilitate effortless operation and automation, thereby improving workflow efficiency.

Both the E8257D and E8267D PSG instruments incorporate cutting-edge technologies such as low-noise microwave and RF components, as well as digital signal processing capabilities. They provide users with enhanced accuracy and reliability in their measurements.

In summary, Agilent Technologies' E8257D and E8267D PSG signal generators represent the pinnacle of precision in signal generation technology. With their extensive feature sets, advanced modulation capabilities, and robust performance specifications, these instruments are invaluable tools for engineers and researchers working across various high-tech industries.
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