Ac sources software simplifies testing to mil and aerospace standards pdf

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ac sources software simplifies testing to mil and aerospace standards pdf

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For best results, a three phase AC Power Source is recommended. No other equipment is needed to provide DC power. No DC bias supply is needed to operate the DCR unit and only convection cooling is needed to cool the unit so no fan noise is present.

Free Circuit Simulator

There have been inherent problems with audio frequency conducted susceptibility tests since their inception. These issues are resolved using a novel but inexpensive transducer described herein. Ideally, enough of the injected potential drops across the test sample so that the required ripple potential is developed there.

The purpose of the 10 uF feedthrough capacitor is to be a low impedance shunt at frequencies where the LISNs become a significant impedance, forcing most of the injected potential to drop across the test sample. For a dc bus, the capacitor value can be increased without bound, and a value such as 10, uF ensures, for all practicality, that the injected potential does indeed appear across the test sample.

The bottom line here is that it is critical to monitor the ripple across the test sample input; monitoring at the injection point is insufficient. Given that the return line is generally above ground, the monitoring device, traditionally an oscilloscope, cannot artificially ground it via the oscilloscope probe ground connection.

In modern set-ups, with the monitoring device often connected to computer automation, this floating set-up is complicated by the interface with the automation. Finally, when the test sample is powered from an ac bus, it is quite difficult to monitor the injected ripple riding on the ac power waveform due to the large ratio of potential involved. The maximum ripple limit is 6. In the digital edition of this issue, the picture is a video and the difficulty in measuring the audio ripple is more obvious.

Click here for the video! It worked on the principle that the phase of the ac power waveform was degrees reversed between the power source and the test sample so that if one used transformer action to sum the potentials across the power source and load, the result would be only the injected ripple, which would be in phase across power source and load.

This works well if all the injected ripple drops across the test sample, but if any has dropped across the power source it gets added to the ripple across the test sample, and the technique then overestimates the ripple level across the test sample alone. It is as if the injected ripple were simply measured at the point of injection, which would be much simpler.

For this reason, the phase shift network technique of monitoring the test sample ripple was proscribed in MIL-STDD in , and ever since. With the loss of the phase shift network, the ability to monitor injected potentials at frequencies below that of the ac power waveform was likewise lost.

The lower frequency modulation appears as a rolling change in amplitude that is impossible to gauge because its full value appears only across many cycles of the ac power waveform. A useful but expensive approach is to use a dynamic signal analyzer DSA to view injected ripple in the frequency domain, allowing separation from the power frequency component.

With this technique, the ac bus potential has to be attenuated, but the attenuation factor is 3 or 4, and that allows plenty of dynamic range to see the injected ripple potential.

The author tried another technique using a distortion analyzer. The concept was to zero out the power waveform without any injected ripple, and then anything that would show up when ripple was injected would be the desired quantity to be measured. In practice, not enough of the power frequency waveform could be nulled out to enable reading the injected ripple accurately.

The PRD is a passive signal conditioner that acts as an attenuator, impedance match, and isolator. If the required limit cannot be established across the test sample power input, and the 80 watt limit has been reached, a flip of the switch allows a quick reading of the ripple potential dropped across the power source. If that level is enough that, added to the ripple across the test sample the sum meets the required limit, then action must be taken to reduce the power source impedance so that the missing ripple potential moves from the power source to the test sample power input.

Absent this requirement, the test is not well-controlled and repeatable. For those lacking the experience, the video in the digital edition is instructive. The ability to measure ripple injected below the power bus frequency is demonstrated by comparing Figures 7 and 8.

Careful inspection of the snapshot picture reveals that the amplitude is changing from cycle to cycle; the envelope is on the right. However, when using the PRD to facilitate a frequency domain measurement, measuring below the power bus frequency is no different than measuring above it. The power frequency and second and third harmonics are visible in addition to the injected ripple.

This is how existing automation for rf conducted susceptibility testing is made available for audio frequency conducted susceptibility testing via use of the PRD. This, however, relies on extremely accurate and stable tuning so that the peak of the test signal is captured. The device works just as well on a dc as an ac bus and, by providing isolation, removes the need for an isolation transformer on the monitoring device.

An inexpensive transducer PRD that solves several long-standing issues with audio frequency conducted susceptibility testing has been developed at the EMC Compliance test facility.

By separating the injected ripple from the power waveform, the PRD allows accurate and very simple monitoring of the injected waveform, something that has been difficult or extremely expensive to do until now. The PRD also provides a quick check to see if excess ripple is dropped across the power output if not enough is measured across the test sample power input. Home Troubleshooting EMI. Ken Javor. June 1,

Software Simplifies Testing to Mil and Aerospace Standards

Why register? Registration allows access to the entire site including downloads of our application notes and users manuals. Engineers may have captured a distorted voltage waveform at a particular location because it causes their device under test DUT to malfunction using a digital storage oscilloscope DSO with the intent to reproduce the voltage waveform in a laboratory environment for product improvement. The Chroma series or series programmable AC voltage supplies are capable of reproducing complex user defined AC voltage waveforms. Read More.

Why register? Registration allows access to the entire site including downloads of our application notes and users manuals. Register or login to continue. This method will determine whether This application note discusses wet insulation testing on solar photovoltaic modules. This application note provides information on changes in appliance hipot testing procedures. This application note provides information about how safety testing can improve the bottom line.


AC Sources Software Simplifies Testing To Mil And Aerospace Standards 1 files AC Sources Measuring Motor Inductance And Impedance Using An AC Source 1 files All notes are in Adobe Acrobat PDF format. Click the image​.


Performing GR-1089-Core Lightning and Power Cross Test

There have been inherent problems with audio frequency conducted susceptibility tests since their inception. These issues are resolved using a novel but inexpensive transducer described herein. Ideally, enough of the injected potential drops across the test sample so that the required ripple potential is developed there. The purpose of the 10 uF feedthrough capacitor is to be a low impedance shunt at frequencies where the LISNs become a significant impedance, forcing most of the injected potential to drop across the test sample.

These sources have the capability of providing avariety of output voltages from 0 to VAC, frequencies from 15 to Hz, and advancedmeasurement capabilities including: voltage, current, crest fac to r, power fac to r, inrush current, to talpower, reactive power and real power. The Chroma Single Phase Series features an external voltage input that can be used with anarbitrary waveform genera to r to create complex waveforms. This allows cost effective solution forrequirements beyond a simple sinusoidal signal output. The software allows for easy setup, and the ability to create a sequence of tests and reporting features to s to re measurements to a file. The timing on a sequence can be controlleddown to ms.

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Software Simplifies Testing to Mil and Aerospace Standards

Dec 18, White Paper. This white paper explores the challenges facing today's armament maintainer as new weapon systems enter service, and shows how innovative solutions are changing the armament test paradigm. Read more Jan 11, version: D Marvin Test Solutions, a vertically-integrated aerospace test and measurement company, has created and delivered innovative, reliable test systems for factory, depot, intermediate, and flightline use since

Enables quick and easy configuration of complete, high efficiency, compact, multi-output power systems. A novel approach to industrial rectifier systems: Dense, efficient and modular architecture enabled by fixed-ratio bus converters. Reduce load capacitance in noise-sensitive, high-transient applications, through implementation of active filtering. Scalable power solutions allow marine instrumentation to keep precision while operating in extreme environments.

Alternating practical knowledge and scientific contributions

A brief description of the GRCORE document is presented to familiarize the reader with the importance of this requirement. A description of the types of equipment that are typically required to meet the Lightning and Power Fault test is provided. As a result of this growth, the Regional Bell Operating Companies RBOC and other service providers are attempting to bring new devices online at a rapid pace. These two documents are known as the Network Equipment Building Systems NEBS requirements and are designed to assure the safe and efficient operation of the Network in a wide range of harsh environments. Tests include some rather benign requirements such as package vibration and drop test.

To get a basic understanding of NEBS, visit www. Using NEBS, a vendor can design telecom equipment that will be installed in a CO without disrupting operations—a decided plus in terms of economy and efficiency. One of the many facets of this system is an electromagnetic compatibility EMC requirement. This document details EMC and safety criteria and applicable test methods. This article focuses primarily on the EMC criteria. Radiated emissions electric and magnetic fields are included along with conducted emissions such as AC power leads, AC and DC power and signal leads, and analog voiceband leads. Other sources of interference or problems detailed are lightning and AC power fault, steady-state power induction, and DC potential difference.

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  • The Soft Panel is a Windows based software package designed for control of the SeriesSingle Phase AC Source. The software allows for easy. Iva G. - 19.06.2021 at 10:37

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