Case Study: Combating EMC Challenges in Laboratory Systems

laboratory systemsAchieving Unprecedented Efficiency by Addressing Conducted Emission with an Innovative EMI Filter Solution

Laboratory equipment must have low electrical emissions to ensure accurate and reliable results. This is particularly important for instruments like centrifuges, commonly found in clinical and research labs. Centrifuges are essential for separating particles based on density in fluids, gases, or liquids. However, the functionality of these instruments can be compromised if there are high levels of electrical interference. By effectively reducing conducted emissions, this filter solution ensures that the equipment operates at its optimal level, delivering accurate results every time. 

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Uncovering EMC Hurdles in the Design and Production of Laboratory Equipment

During our collaboration with a lab centrifuge manufacturer, our team encountered a range of obstacles. We had to address the CISPR 11 conducted emissions requirements and found that no standard component could resolve the issue of low-frequency failure. Additionally, the nature of the noise, whether it was common mode or differential mode, was unclear, posing a challenge in designing a solution. Compounding the urgency, the customer was facing a time crunch due to an impending product launch. Moreover, the customer being overseas made data acquisition and solution trials a bit more complex. The limited space available further complicated matters, ruling out a longer dual-stage filter as a viable option. Lastly, obtaining safety approval for a custom solution added an extra layer of importance to our work.

EMI FiltersOvercoming Obstacles to Provide an Innovative EMI Filter Solution for Laboratory Equipment

To address the challenge of high electrical emissions in laboratory equipment, our team began by increasing the common mode insertion loss. Unfortunately, this approach did not yield the desired results. We then shifted our focus to increasing the differential mode insertion loss by making adjustments to the X-cap. Given the limited space available, we carefully optimized the X-cap to strike the perfect balance between size and performance. Through this optimization, we were able to increase the X-cap from 0.1uF to 0.68uF, enabling the customer to successfully pass the emissions test. However, it is important to note that this change in the X-cap resulted in the voiding of agency approvals. To rectify this, we conducted UL1283 and IEC 60939 testing at our in-house safety lab, and within a remarkable 8-week timeframe, we obtained new certifications. What sets ATDI apart is our ability to tailor our MOD-Std products to meet the unique needs of our customers, our prompt technical support and sample provision, as well as our in-house agency certification capabilities.