Therefore, this test would need to be calibrated at 18 V/m, rather than just 10 V/m. This type of modulation increases the overall amplitude of the signal, if not adjusted as in the case of other standards. The reason is that IEC 6 requires a 1 kHz, 80% amplitude modulated signal. Sizing equipment for a 10 V/m MIL-STD-461 RS103 system may not be sufficient to use for a 10 V/m IEC 6 system. Another example involves required modulations. For example, looking at the cost of an amplifier needed for 200 V/m testing at a 1 meter test distance versus the cost of an amplifier for 200 V/m testing at 2 meters, one might change their mind. To the uninitiated, some of these differences may not seem that drastic. This table is not intended to be comprehensive however, it does identify some of the key differences between some of the more common test standards in today’s electronics marketplace. An example of these differences for RI can be seen in Table 1. However, when you dive into the respective test standards, you begin to realize that there are, in fact, some significant differences. Across all industries, RI and CI testing share a lot of commonalities. The first step in selecting the proper equipment for RI and CI testing is to understand the requirements of the test itself. Significant amounts of time could be spent on each one of these tests, but in the interest of brevity, we will focus the efforts of this paper on radiated immunity (RI) and RF conducted immunity (CI). There are numerous types of EMC testing, which require numerous types of test equipment. That said, this paper is intended to examine the thought process behind selecting and sizing appropriate test equipment when the need arises. Again, formal EMC education is not always readily available to some organizations and test programs often don’t have the available time for someone to get up to speed. It is not uncommon to see engineers and technicians with little or no EMC test experience thrust into positions that even a seasoned EMC engineer could have difficulty with. The problem is that this growth tends to outpace available EMC resources. While this rapid growth certainly drives the need for new and additional test equipment to accommodate new requirements, the growth also drives the need for educated and experienced EMC engineers and test personnel. Test environments and requirements across all industries continue to evolve at a rapid pace. What has become apparent, is that the need for EMC testing has continued to grow nearly exponentially throughout its existence. This paper walks through the important considerations for selecting test equipment, specifically for EMC testing.Įlectromagnetic compatibility (EMC) testing has been around for decades and will continue as long as there are electronic devices in use. Historically, not a lot of education has been provided on the careful considerations needed for determining and selecting the proper quality test equipment demanded for this testing. Efficient EMC testing is more critical than ever, and is dependent on high-quality test equipment. Explosive growth in technologies like portable electronics, Internet of Things (IoT) devices, and autonomous vehicles has led to a world full of electromagnetic interference.
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