General Information - 1

CAUTION: Programming the ac source output impedance into a load with a low impedance can cause output voltage instability, which may damage the ac source. Stability MUST be maintained when operating the ac source with programmable resistance or inductance.

To check for stability, monitor the output voltage with an oscilloscope. Instability exists if a 5kHz to 20kHz oscillation, which is dependent upon the ac source’s programmed inductance and the capacitance of the load, is present at any time during the following procedure.

1.When programming inductance, it is recommended that you first add a series resistance either by programming the output resistance to 1 ohm or by adding an equivalent external resistor.

2.Slowly program the inductance to the desired level while monitoring the output for any voltage instability. Do not proceed any further if the output shows any signs of instability.

3.If less output resistance is required, slowly start lowering the resistance while monitoring the output for any voltage instability. Do not proceed any further if the output shows any signs of instability.

If you cannot achieve satisfactory results with this procedure, disable the output impedance control and use an external impedance network.

Rms voltage regulation can be used in conjunction with programmable output impedance to regulate the rms value of the ac component of the output voltage when programmed impedances cause distortion with nonlinear loads or reduced output voltage due to regulation effects.

Note that real-time voltage regulation will permit the load current to cause output voltage degradation based on the programmed impedance and current drawn from the source, whereas rms regulation will reestablish the rms value at the programmed level.

Output Coupling

Ac output coupling mode mimics a transformer-coupled output, working to maintain zero average output voltage. This means that the output tries to remove any dc content on the output, whether the dc content is generated from a programmed offset or results from transients with dc content. The ac output coupling has a corner frequency of about 2 Hz, which will not prevent transient waveforms that may have short-term dc content, but will regulate the waveform back to an average value of zero volts in the steady state.

Dc output coupling mode is used to generate dc offset voltages or output transients that have net dc components. In either mode of operation, the maximum voltage that the ac source can output is limited to 425 V peak.

The ac capability of the output is limited by VA (volt-amperes) rather than power (watts). The amount of VA available to a load can be determined by examining figure 1-2. Full output VA is available with no limitations except for the boundaries imposed by the maximum rms voltage of 300V, and the maximum rms current, which is model-dependent. Note that large peak power transients can be delivered by the ac source as earlier described under "Peak Current Capability"(Appendix A documents the ac source’s specifications and supplemental characteristics.)

19

Page 18 Page 20
Page 19
Image 19
Agilent Technologies 6811B, 6813B, 6812B manual Output Coupling
Page 18 Page 20

6812B, 6811B, 6813B specifications

Agilent Technologies, a leader in electronic test and measurement equipment, offers a range of powerful signal sources including the 6843A, 6834B, 6814B, 6813B, and 6811B models. These instruments are designed to support various applications in research, development, and manufacturing, providing precise signal generation capabilities.

The Agilent 6843A is a versatile signal generator known for its exceptional frequency range and modulation capabilities. It supports an extensive bandwidth, making it ideal for applications that require high-frequency signal generation. With its superior phase noise performance, the 6843A is an excellent choice for radar, wireless communications, and electronic warfare applications. The instrument features an intuitive user interface, allowing engineers to set parameters quickly and efficiently.

Next, the Agilent 6834B offers exceptional performance characteristics, including high output power and low distortion. This signal generator is particularly noted for its ability to produce complex modulation formats, making it suitable for testing advanced wireless communication systems. With a reliable and stable output, the 6834B ensures accurate and repeatable measurements, which is vital for thorough testing processes.

The 6814B model stands out for its dual-channel capabilities, allowing users to generate simultaneous signals for testing multiple components or systems. This feature significantly enhances testing efficiency and flexibility for engineers. With built-in arbitrary waveform functionality, users can create custom waveforms, making the 6814B suitable for a wide range of applications including device characterization and signal processing research.

For those seeking a more compact solution, the Agilent 6813B provides essential signal generation features without compromising on performance. It is designed for a variety of applications across telecommunications and consumer electronics, featuring a straightforward interface and robust performance metrics.

Lastly, the 6811B is an entry-level yet capable model that supports a broad spectrum of testing needs. Perfect for educational and laboratory environments, it provides essential functionalities required for effective signal generation and analysis.

Overall, Agilent Technologies' 6843A, 6834B, 6814B, 6813B, and 6811B signal generators offer an array of features and technologies that cater to various application needs. Their precision, reliability, and user-oriented designs position them as invaluable assets in any testing environment, ensuring engineers can carry out their work with confidence and accuracy.
Top Page Image Contents