Testing

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

This article addresses the critical question of which method—SVSWR or TDR—more accurately assesses a test site. Given the investments companies make in test sites for EMC compatibility, this is a key assessment question.

The Application of Time Domain Measurements

Despite the many benefits of using the TDR method for site validation, as an accredited test laboratory we are compelled to also perform site validation measurements using the CISPR 16-1-4 SVSWR method.

Free Space Antenna Factors Through the Use of Time-Domain Signal Processing

The term free-space implies that there is no electromagnetic interaction between the test environment and the antenna.

S-parameter Data Correction Using Time Domain Gating for PCB and Cable Applications

This paper describes how to remove the measurement artifacts caused by discontinuities in high frequency S-parameter data caused by the test connectors on the Printed Circuit Boards (PCBs) and cables. The frequency domain S-parameters are converted to the time domain to get the impulse response. Time domain gating is then used on this impulse response to remove reflections due to end connectors and/or other discontinuities. The gated impulse response is then transformed back to the frequency domain. The final result is a much improved S-parameter data set with unwanted resonance removed, allowing the PCB trace or cable loss to be determined.

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