E

Current Loop Compensation (Series 668xA Only)

Introduction

This section describes how you may use current loop compensation to optimize for inductive loads or for fast CV/CC mode crossover. A 7-position compensation switch for this purpose is located under the cover on the rear of the power supply.

Function of Loop Compensation

Figure E-1 shows the switch settings for specific combinations of load inductance and resistance. Two sets of curves show the small-signal response for each model. The dashed curves represent programming performance of no more than 10% current overshoot. The solid curves represent operating conditions with 25% overshoot. The curve obtained with all switches open gives the fastest CC mode crossover response time. However, as shown by these curves, the loop will not tolerate larger inductances unless the load resistance is increased. The curve described when all switch positions are closed shows the as-shipped performance curve. This position provides 10% overshoot and fast CV/CC crossover performance for load inductances that are specific for each model. (For Models 6680A and 6681A, this curve ranges from 100 ∝ohms at 15 ∝henries to about 100 milliohms at 40 millihenries.). You can select a different compensation curve by opening a specific switch or combination of switches.

Table E-1 shows some specific L ⎟ R ratios and the switch positions required for these ratios. Table E-1 is valid only for Models 6680A and 6681A - you must use the curves for the remaining models. The corresponding 10% overshoot curves are shown in Figure E-1. As operation moves along the curves from left to right, the switch positions must be changed as shown along the X-axis.

Table E-1.

Settings For CC Loop Compensation Switch (Models 6680A and 6681A Only)

Load Characteristic (L/R)

 

 

1Switch Setting

 

 

 

 

7

6

5

4

3

2

1

215

1 ∝H/3 mΩ

0

0

0

0

0

0

0

∝H/100 ∝Ω

1

1

1

1

1

1

1

30

∝H/100 ∝Ω

0

0

0

0

0

0

1

100

∝H/100 ∝Ω

1

1

1

1

1

1

0

150

∝H/100 ∝Ω

0

0

0

0

0

1

0

600

∝H/100 ∝Ω

1

1

1

1

1

0

0

1.2 mH/100 ∝Ω

0

0

0

0

1

0

0

4 mH/100 ∝Ω

1

1

1

1

0

0

0

10 mH/100 ∝Ω

0

0

0

1

0

0

0

40 mH/100∝Ω

1

1

1

0

0

0

0

100 mH/100 ∝Ω

0

0

1

0

0

0

0

380 mH/100 ∝Ω

1

1

0

0

0

0

0

650 mH/100 ∝Ω

0

1

0

0

0

0

0

 

7 H/100 ∝Ω

1

0

0

0

0

0

0

1 "1" = switch closed; "0" = switch open.

2 Factory setting.

 

 

 

 

 

 

 

 

 

 

Current Loop Compensation (Series 668xA Only) 129

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Agilent Technologies 665xA, 664xA, 667xA manual Current Loop Compensation Series 668xA Only, Function of Loop Compensation

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.