Testing

Learn from best practices within the industry, pre-testing considerations, troubleshooting tips, lessons-learned, and problem solving recommendations.

Caster Contact: The Achilles Heel of ESD Floors

A fully functional ESD floor prevents static generation and provides an effective path to ground for personnel and equipment. Many conductive and dissipative floors meet STM 7.1 resistance parameters in ANSI/ESD S20.20 but fail to provide adequate electrical contact for grounding equipment with conductive casters and drag chains.

Will 4% Steps Find Radiated Susceptibilities?

CISPR Publications 24 and 35 allow radiated and conducted immunity tests to be performed using I% or 4% steps. This article looks at measured radiated immunity test data to determine the typical shapes of radiated susceptibilities for multimedia equipment. The authors consider what those shapes tell us about the validity of the 4% step method.

Firmware: The Inexpensive Way to Address EMC Issues

Firmware is integral to the operation of most devices, and may represent an easier and less expensive pathway for addressing EMC issues. This article presents different approaches to modifying firmware as well as case studies illustrating the potential effectiveness of this approach.

Device Failure from the Initial Current Step of a CDM Discharge

CDM discharges exhibit a fast initial current step when the stray capacitance of the pogo pin is charged. It is demonstrated that the high slew rate can damage sensitive gate oxides. The miscorrelation of CDM and CC-TLP methodologies is addressed by applying pulses with 20 ps rise time.

Why You Should Pay Attention to Cable Discharge Events (CDE)

Cable discharge events occur more frequently than we think, but they often go unrecognized or undiagnosed for root causes, resulting in unnecessary device failures. This article discusses the origins of three types of cable discharge events.

A Novel Statistical Model for the Electromagnetic Coupling to Electronics inside Enclosures

The goal of this paper is to investigate fundamental mathematical and statistical algorithms for the spatiospectral analysis of electromagnetic coupling in large, complex electronic systems. A novel stochastic Green’s function and a statistical representation formula are proposed, which statistically replicates the multipath wave-chaotic dynamics inside cavity environments. The work achieves a physics-based modeling and simulation capability that predicts the probabilistic behavior of high power radio-frequency induced current and voltages in complex electronic systems.

Measurements of Conducted EMI in the Manufacturing Environment

Answering the needs of managing EMI in actual use, this article provides hands-on guidance to specialists at the factories and elsewhere on measuring conducted EMI where it matters – in their environment. Anyone who knows how to use an oscilloscope can perform such measurements.

Let’s Talk About… The Value of Pre-compliance Testing

Without much effort and expense, it is possible to perform pre-compliance testing in a manner that saves considerable time and money without commercial or financial risks associated with purchasing a full-compliance test facility.
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