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Archive for June, 2021

Two Methods to Absorb Motor’s Regenerative Current Using Electronic Load

Posted on: June 23rd, 2021 by Doug Lovell
Two Methods to Absorb Motor’s Regenerative Current Using Electronic Load 23/06/2021
There are two methods to absorb motor’s regenerative current; Voltage Clipping Method and Bleeder Method. The following describes the characteristics, functions and precaution for the methods. Fig.1 illustrates the typical test system. 1...

Choosing Electronic Load that Best Fits Your Switch Testing System

Posted on: June 23rd, 2021 by Doug Lovell
Choosing Electronic Load that Best Fits Your Switch Testing System 23/06/2021
The switch on/off testing can be performed with a combination of DC power supply and electronic load (See Figure 1). To successfully conduct the testing, it is important to know that the current flow through the switch varies by the electronic load specifications or settings. Especially during the life testing, you should be aware that it may affect the lifetime of test switch. This white paper s...

How to use the power line disturbance simulation function of PCR-WE

Posted on: June 23rd, 2021 by Doug Lovell
How to use the power line disturbance simulation function of PCR-WE 23/06/2021
Voltage dips, short interruptions and voltage variations immunity tests of the IEC 61000-4-11 standard can be easily tested using the power line disturbance simulation function of PCR-WE. As an example, it explains how to set the voltage dip test. You can easily execute tests under the test conditions specified in the standard in a few steps. ...

How Does Surge Suppression Work in PCR-LE/LE2 Series?

Posted on: June 23rd, 2021 by Doug Lovell
How Does Surge Suppression Work in PCR-LE/LE2 Series? 23/06/2021
PCR-LE/LE2 Series feature the Surge Suppression function that involves the process of protecting PCR-LE/LE2 from voltage spike. You can choose Surge Suppression to turn on or off depending on your load condition. If you want to avoid any voltage overshooting or undershooting, always set Surge Suppression to on. However, when you use a load with regenerative feedback (e.g. capacitive load or batte...

Necessity of Grounding Output Terminal for DC/AC Power Supply

Posted on: June 23rd, 2021 by Doug Lovell
Necessity of Grounding Output Terminal for DC/AC Power Supply 23/06/2021
Power supply has the following three output terminals: - DC power supply: Positive/negative terminals and Ground (GND) terminal - AC power supply: L/N terminals and GND terminal. Upon using both power supplies, it is necessary to determine whether either of positive or negative terminals or L/N terminals is connected to the GND terminal. As our factory default; - DC power supply: Depending on ...

How to Minimise Power Supply Noise in Test Systems

Posted on: June 23rd, 2021 by Doug Lovell
How to Minimise Power Supply Noise in Test Systems 23/06/2021
Noise is an unwanted but inevitable problem in test systems including power supply sources, except batteries, which are low-noise power sources. Some amount of noise is always generated or relayed by power supplies; however, a power supply is a device that supplies power to another device, and not intended to be used by itself. Power supply noise should be low enough so as not to interfere with th...

DC Electronic Load – Part 2: Basic Operation Mode and Principle (1)

Posted on: June 23rd, 2021 by Doug Lovell
DC Electronic Load – Part 2: Basic Operation Mode and Principle (1) 23/06/2021
As described in Part 1, electronic loads can act as a variable resistor and regulate a current depending on your applications. With this function, electronic loads can be used as substitute for high-power components. To fulfill this function and test DUTs effectively, there are four operation modes for electronic loads: 1) constant current 2) constant resistance 3) constant voltage and 4) constant...

What Makes a Good Power Supply?

Posted on: June 23rd, 2021 by Doug Lovell
What Makes a Good Power Supply? 23/06/2021
DC or AC regulated power supplies (hereinafter called ‘power supply’) can be classified into eight types and four categories in accordance with the output source (DC or AC), output range, polarity or circuit method as shown in Table 1. In this...

What It Takes to Keep Regulated DC Power Supply Stable Part 2: Load Conditions

Posted on: June 23rd, 2021 by Doug Lovell
What It Takes to Keep Regulated DC Power Supply Stable Part 2: Load Conditions 23/06/2021
Basically, a regulated DC power supply (referred as DC power supply) is an electrical device that provides a constant output voltage; however, sometimes it cannot remain stable. There might be some factors that affect the stability of the DC power supply, and Part 1 previously focused on one of them: how you connect cables on a system. Here in Part 2, we look at one other important factor that nee...

How to Select a Right DC Power Supply Part 2: Key Considerations

Posted on: June 23rd, 2021 by Doug Lovell
How to Select a Right DC Power Supply Part 2: Key Considerations 23/06/2021
Welcome back to Part 2 of this series! Part 1 is all about the functions and characteristics of DC power supplies. In Part 2 here, we will take a look at the considerations when selecting a right power supply. 1. Key Considerations There are too many considerations when selecting a DC power supply. This makes it hard to select a right power supply without any understanding, whic...

Voltage Interruption Waveforms Provided by PCR-LE Series

Posted on: June 23rd, 2021 by Doug Lovell
Voltage Interruption Waveforms Provided by PCR-LE Series 23/06/2021
In an AC circuit, power supply interruption can be mainly divided into two types: it occurs with low impedance or with high impedance. The power supply interruption with low impedance is a short-circuit interruption. A short circuit is an unintended path to flow a current with typically very low impedance. Whereas, the power supply interruption with high impedance is an open-circuit interruption....

How to Reduce Power Supply Noise

Posted on: June 23rd, 2021 by Doug Lovell
How to Reduce Power Supply Noise 23/06/2021
In a test system, AC power supply is one of the significant components that can create test sequences for output and supply source to DUT. However, the power supply may cause a noise issue during test. There is some noise interference such as conducted noise and magnetic field that may enter into the test system. This article focuses on a noise terminal voltage at an input and output terminal whi...

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