Connecting Supplies in Series

Floating voltages must not exceed ± 60 Vdc. No output terminal may be more than 60 V from chassis ground.

Figure 4-5f illustrates how power supplies can be connected in series for increased voltage capability. Series connections are straightforward in this case.

Program each power supply as an independent supply. If two supplies are used in series operation, each supply can be programmed to deliver 50% of the total output voltage. Set the current limit of each power supply to the maximum that the load can handle without damage.

If one supply experiences a desired shutdown condition (such as caused by overtemperature or overcurrent), it does not automatically shut down the other supply. You must first enable remote inhibit (RI) and discrete fault indicator (DFI) operation. It is recommended that you use the RI and DFI functions to automatically shut down both supplies whenever one supply experiences a shutdown condition. See "Fault/Inhibit operation" in "Appendix D - Digital Port Functions" for wiring information and "Questionable Status Group" in the "Programming Guide" for programming information.

Analog Connector

Load

Load Connection

Program each supply for full load current and 1/2 the load voltage

A Connect for remote sensing (optional)

 

B Connect for local sensing (default)

WARNING

FLOATING VOLTAGES MUST NOT EXCEED ±60 VDC. NO OUTPUT TERMINAL MAY

BE MORE THAN 60 V FROM CHASSIS GROUND.

Figure 4-5f. Series 668xA and 669xA Series Connection (Remote Sensing Optional)

Each power supply has a reverse voltage protection diode across its output. If the fan in one of the series power supplies shuts down for any reason (such as a fan circuit defect or loss of ac power), the supply may severely overheat due to current forced through its reverse current diode by the functioning supply. This possibility can be eliminated by use of the Rl/DFI functions previously noted. Also, if a reverse voltage is applied across a functioning supply, it has no control over the current conducted through this diode. To avoid damaging the supply, never connect it in such a way that a reverse voltage can force it to conduct current in excess of the supply's maximum rated current. (see Table 1-4b)

User Connections 81

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Agilent Technologies 664xA, 665xA, 667xA, 669xA, 668xA manual Connecting Supplies in Series
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668xA, 669xA, 667xA, 664xA, 665xA specifications

Agilent Technologies has long been a pioneer in the production of high-performance electronic test and measurement instruments, particularly in the field of power sources. Among its notable offerings are the Agilent 667xA, 669xA, 665xA, 664xA, and 668xA series of power supplies. These instruments are designed to provide stable, reliable power for a variety of applications, including electronic testing, industrial processes, and research laboratories.

The Agilent 667xA series is characterized by its programmability and advanced measurement functions. These power supplies support a wide range of output voltages and currents, allowing for flexible configurations that cater to different testing needs. The built-in measurement capabilities enable users to monitor the voltage, current, and power with high precision, which is essential for ensuring optimal performance in electronic applications.

The Agilent 669xA series stands out with its high-power outputs, making it suitable for demanding applications. These power supplies deliver high voltage and current levels, making them ideal for testing high-performance devices, such as power amplifiers and motor drives. Additionally, the 669xA series includes features such as overvoltage protection and complex output sequencing to enhance the safety and reliability of the testing process.

The Agilent 665xA and 664xA series focus on delivering high accuracy and excellent regulation. These models are particularly known for their low noise operation, which is critical for sensitive applications where precision is paramount. The integrated programming capabilities allow users to automate testing sequences, thus improving efficiency in research and development settings.

The 668xA series features advanced digital signal processing that enhances the precision and stability of the output. Users benefit from features like remote sensing and monitoring, allowing feedback adjustments that maintain output accuracy despite cable losses. Furthermore, the 668xA models can integrate seamlessly with various test environments thanks to their LAN, GPIB, and USB connectivity options.

Overall, the Agilent 667xA, 669xA, 665xA, 664xA, and 668xA power supplies provide a comprehensive range of solutions for diverse electronic testing needs. With their advanced features, superb measurement capabilities, and robust performance, these instruments empower engineers and researchers to conduct their work with confidence, precision, and efficiency.
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