Power Supply Tests

Table 2

 

Load Transient

 

Current Limit

 

Efficiency and

 

 

Recovery Time

Load Effect

Characterization

PARD

Power Factor

Start-Up

 

 

 

 

 

 

 

Electronic Load

trise ≤ 15 µs

1% programming

1% programming

1% programming

1% programming

1% programming

 

 

accuracy

accuracy

accuracy

accuracy

accuracy

 

Trigger output to

CC or CR mode

CR or CC mode

CC or CR mode

CC or CV mode

CR mode

 

the oscilloscope

 

 

Low PARD

 

 

 

 

 

 

 

 

 

Digital

tsample ≤ 100 ns

N/A

N/A

tsample ≤ 25 ns

N/A

tsample ≤ 1 µs

Oscilloscope

 

 

 

DC to 20 MHz

 

Record length 1 K

 

 

 

 

minimum bandwidth

 

samples minimum

 

 

 

 

Record length

 

 

 

 

 

 

≥2 K samples

 

 

 

 

 

 

100 µ/Div (linears)

 

 

 

 

 

 

1 mV/Div (switchers)

 

 

 

 

 

 

 

 

 

Digital

N/A

51/2 Digits

51/2 Digits

N/A

N/A

N/A

Multimeter

 

±0.005% accuracy

±0.005% accuracy

 

 

 

 

 

 

 

 

 

 

Wattmeter

N/A

N/A

N/A

N/A

1% accuracy with

N/A

 

 

 

 

 

crest factors to

 

 

 

 

 

 

10:1 in current

 

 

 

 

 

 

waveforms

 

 

 

 

 

 

 

 

Regulated

>1% regulation

>1% regulation

N/A

>1% regulation

>1% regulation

>1% regulation

AC Source

Adjustable peak

Adjustable peak

 

Adjustable peak

Adjustable peak

Adjustable peak

 

and frequency

and frequency

 

and frequency

and frequency

and frequency

 

 

 

 

 

Power factor

Phase control

 

 

 

 

 

measurement

 

 

 

 

 

 

capability

 

 

 

 

 

 

 

 

RF rms

N/A

N/A

N/A

100 µV Full scale

N/A

N/A

Voltmeter

 

 

 

DC to 20 MHz

 

 

 

 

 

 

minimum bandwidth

 

 

 

 

 

 

 

 

 

Load Transient Recovery Time

A constant voltage DC power supply is designed with a feedback loop which continuously acts to maintain the output voltage at a steady-state level. The feedback loop has a finite bandwidth, which limits the ability of the power supply to respond to a change in the load current. If the time delay between the power supply feedback loop input and output approaches a critical value at its unity gain crossover, the power supply will become unstable and oscillate. Typically, this time delay is measured as an angular difference and is expressed as a degree of phase shift. The critical value is 180 degrees of phase shift between the loop input and output.

4

Figure 1. Load Transient Recovery Time

Load transient recovery time measurements require an electronic load with a risetime and falltime at least five times faster than the power supply under test.

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Agilent Technologies AN 372-1 specifications Power Supply Tests, Load Transient Recovery Time
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AN 372-1 specifications

Agilent Technologies AN 372-1 is a versatile and highly regarded instrument in the field of electronic testing and measurement. Designed primarily for research and development, as well as validation in production environments, this advanced technology showcases Agilent's commitment to providing high-quality measurement solutions.

One of the standout features of the AN 372-1 is its wide frequency range capability, enabling it to effectively measure signals across various applications. This instrument supports a frequency range extending up to 26.5 GHz, making it suitable for high-frequency applications in telecommunications, aerospace, and defense sectors. With this broad frequency capability, users can rely on the AN 372-1 for accurate and reliable measurements in the most demanding environments.

Another significant attribute of the AN 372-1 is its high dynamic range, which allows for precise detection of both weak and strong signals in the presence of noise. This characteristic is essential for engineers working to ensure signal integrity in complex systems, as it allows for the identification of issues that may otherwise go unnoticed. Coupled with a fast sweep speed, the device can quickly capture transient events or changes in signals, making it a vital tool for time-sensitive applications.

The user interface of the AN 372-1 is designed for ease of use, with a touchscreen display that simplifies interaction and data visualization. Its intuitive design enables users to set up measurements and navigate through the many options effortlessly. Furthermore, the instrument is equipped with advanced analysis features and software that enhance data interpretation and manipulation, allowing engineers to derive meaningful insights from their measurements quickly.

In addition to its measurement capabilities, the AN 372-1 supports advanced connectivity options, including USB, LAN, and GPIB. This ensures seamless integration with other instruments and systems, facilitating a more streamlined testing workflow. The ability to connect with external software also enhances its functionality, allowing users to automate processes and improve test efficiency.

The AN 372-1's rugged design ensures it can withstand the challenges of both laboratory and field use. Its build quality speaks to Agilent's commitment to creating long-lasting instruments that offer reliable performance throughout their lifecycle. Overall, the Agilent Technologies AN 372-1 stands out as a comprehensive tool for engineers and researchers requiring precise, reliable, and efficient electronic measurements across a myriad of applications.
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