AC Input and Bias Supplies

Theory of Operation

This chapter provides a brief theory of operation for the Agilent 6610xA Power Modules. Figure 4-1 is a block diagram of the primary circuit functions of the power modules. The diagram references the schematic sheets where the circuits are located.

AC input power is distributed to each module through the backplane connector board on the mainframe. A turn-on relay inside the module applies ac power from the mainframe to the power module. This relay receives its bias power from the mainframe and is opened and closed by a control signal from the mainframe.

The ac input is rectified and filtered in the power module, producing the + and - dc rail. In addition to the dc rail, the ac input is also applied to a bias transformer, which provides the following bias voltages:

+15V (primary)

+5V (secondary)

± 12V (secondary)

Microprocessor Circuits

All communication between the modules and the controller or keyboard except for the trigger signals is processed by U44 on the mainframe. The primary function of this microprocessor is to distribute the digital signals from controller or keyboard to the correct module slot in the mainframe.

Microprocessor Ul on the modules communicates with U44 through two data lines -a transmit and a receive line (Tx and Rx). Associated with Ul is ROM chip U2, RAM chip U3, and EEPROM chip U22.

At turn-on, microprocessor Ul first transfers the calibration constants that are stored in the EEPROM chip of each module into RAM. It then applies the calibration correction factors in RAM to the voltage or current setting information and calculates a bit count that it sends to the DACs. The microprocessor directs the data either to the CV or the CC DAC. It is able to send sixteen data bits to each DAC by first strobing in the upper byte, and then strobing in the lower byte.

CV/CC DACs

Upon receiving data from the microprocessor, the CC and CV DACS output the correct analog output voltage. Both the CC and the CV DACs output an analog signal in the range of 0 to minus 6 volts (calibrated), which corresponds to the zero to full-scale output range of the power module’s voltage and current. The DACs are referenced to a regulated 7V bias.

Theory Of Operation 61

6610XA specifications

Agilent Technologies has long been recognized for its innovative contributions to the fields of measurement and testing, and the Agilent 6610XA series of power supplies is no exception. Tailored for demanding applications in electronics and advanced research, the 6610XA series exemplifies cutting-edge technology blended with user-friendly features.

One of the main characteristics of the Agilent 6610XA is its ability to provide a stable, accurate, and reliable power supply across a range of applications. With output voltages that can reach as high as 60V and currents up to 10A, the device is versatile enough to cater to a variety of testing requirements. This power supply is ideal for applications including semiconductor testing, device characterization, and more, where precision and consistency are paramount.

Among the standout features of the Agilent 6610XA is its advanced graphical user interface (GUI), which enhances the overall user experience. The intuitive design allows engineers and technicians to monitor and control voltage and current settings easily, making the process of configuring the device both fast and efficient. Additionally, the device has built-in measurement capabilities that can display real-time voltage and current readings, significantly aiding in troubleshooting and performance evaluation.

Furthermore, the 6610XA incorporates a range of communication interfaces including USB, LAN, and GPIB, making it highly adaptable for integration into various automated test setups. This versatility signifies that the power supply can be seamlessly incorporated into existing laboratory environments, promoting productivity and efficiency.

The series also incorporates intelligent protection mechanisms to ensure both user safety and equipment longevity. Features such as overvoltage protection (OVP) and overcurrent protection (OCP) are designed to prevent accidental overloads, safeguarding both the device under test and the power supply itself.

Another key aspect is the series' capability to perform complex programming tasks with ease. With programming capabilities that enable users to set intricate voltage and current profiles, the device supports advanced applications, including load transient testing and sweep testing. This flexibility makes the Agilent 6610XA a valuable asset for any research and development environment looking to enhance testing efficiency and accuracy.

In conclusion, the Agilent 6610XA series power supply stands out for its combination of precision, user-friendliness, advanced communication capabilities, and safety features. These attributes make it a critical tool for engineers and researchers engaged in the rigorous demands of modern electronics testing and evaluation. With its continued commitment to innovation, Agilent Technologies reinforces its position as a leader in providing high-quality solutions for the measurement and testing industry.