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Grady Keeton

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Test AC Sources with an AC Electronic Load

Posted by Grady Keeton on Jun 18, 2019 4:10:44 PM

Testing AC power sources, such as uninterruptible power supplies, can be a real challenge. These products are often tested with resistive load banks, but this approach does not simulate real-world conditions such as switching DC/AC converters found in many AC powered products.  

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Topics: Compliance Testing, voltage variation

How Can I Decrease Test Time in High-Channel-Count Applications?

Posted by Grady Keeton on Apr 26, 2019 1:44:33 PM

When performing functional tests, keeping test times as short as possible is often a critical requirement. Time is money, after all. One way to reduce test times is to reduce the latency in setting up signal switch paths, stimulus devices, and measurements. These can all have a significant impact on the overall time it takes to complete a full functional test of a particular DUT. 

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Topics: automotive testing, Compliance Testing, defense testing

A New Paradigm for Calibration

Posted by Grady Keeton on Apr 2, 2019 3:42:06 PM

Calibration is not an option. While today's instruments are more accurate and drift less than previous generations, you still need to periodically check and calibrate your equipment. The way you do this, however, is changing.

In the past, manufacturers would recommend calibration intervals. A digital multimeter manufacturer might, for example, recommend that you calibrate the instrument once a year. When that year was up, you sent the DMM to your company's cal lab or to a third party.

That paradigm is changing. The current trend in metrology is not to blindly follow a manufacturer’s stated calibration interval, but to determine your own interval based on how much each instrument drifts over time and how much risk you're willing to take. 

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Topics: calibration, metrology

Total cost of ownership is more than just price

Posted by Grady Keeton on Jan 4, 2018 10:01:29 AM

When you purchase a power supply, you need to take into account more than just the price of the supply. The price is just one of the factors in the total cost of ownership. Other factors include:

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Topics: AC Power Sources, Compliance Testing, DC Power-Supplies, Electronic Loads, Uninterruptible Power Supplies, Programmable Power, Programmable Power Solutions, Solar Testing

Easily program voltage and frequency transients with the Asterion Series

Posted by Grady Keeton on Dec 4, 2017 1:26:01 PM

The success of a product often depends on how well it can handle power transients. To make this testing easier, AMETEK Programmable Power's Asterion makes it easy for users to create custom waveforms that include transients. The output waveforms can include any or all of the following transients:

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Topics: AC Power Sources

Asterion makes harmonic analysis easy

Posted by Grady Keeton on Sep 25, 2017 3:07:47 PM

Power systems operate at frequencies of 50 or 60Hz, but some devices, including personal computers, printers, and some industrial equipment, present a non-linear load and create currents and voltages with frequencies at harmonic frequencies. These harmonics get fed back into the power system and can cause other devices connected to the power source to malfunction. There are several standards that specify the level of harmonics that a particular device can produce.

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Topics: AC Power Sources, harmonic analysis

Get the Rev Right When Running MIL-STD-704 Test

Posted by Grady Keeton on Jul 25, 2017 4:46:16 PM

As noted in an earlier blog post, the tests you run to ensure that airborne utilization equipment is compatible with an aircraft's power system are specified in a series of MIL-HDBKs, specifically MIL-HDBK-704-1 through MIL-HDBK-704-8. To run these tests, a sophisticated power source is essential to simulate various power conditions. In addition, you also need whatever equipment is required to monitor the unit under test (UUT) while running the test.

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Topics: AC Power Sources

RS Series high-voltage option eases PV inverter testing

Posted by Grady Keeton on Jul 14, 2017 11:02:33 AM

As the number of photovoltaic power-generation systems continue to increase, the requirements for photovoltaic inverters are evolving as well. Conventional electrical characteristics such as over-voltage, over-frequency, anti- islanding intended to verify the inverter’s ability to tolerate power grid fluctuation are changing to meet varying requirements of the modern grid. In addition, the introduction of new requirements for low voltage ride through, high voltage crossing, and reactive power injection mean the inverter must be able to provide appropriate compensation when these grid conditions occur.

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Topics: AC Power Sources, RS Series

Ensure Avionics Reliability with MIL-STD-704 Tests

Posted by Grady Keeton on Jun 8, 2017 3:20:50 PM

To ensure that aircraft electronics and other electrically-powered equipment will operate reliably once in the air, you must test them under extreme power conditions. In the military world, MIL-STD-704 (now up to rev. F), “Aircraft Electric Power Characteristics,” establishes the requirements and characteristics of aircraft electric power. This standard is not only used by the U.S. military and military contractors, but has also been adopted, either directly or indirectly, worldwide. For example, the Chinese standard, GJB 181, Characteristics of aircraft electrical power supplies and requirements for utilization equipment, is largely based on MIL-STD-704.

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Topics: AC Power Sources, mil-std-704

Know Your Power Supply Jargon: Isolation

Posted by Grady Keeton on May 24, 2017 10:51:31 AM

The Sorensen XBT Series is one of AMETEK Programmable Power's lines that offer isolated outputs.
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Topics: AC Power Sources, DC Power-Supplies, Isolated output, isolation, Power supply isolation, safety

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