Most, but unfortunately not all, of these digital lines did have sufficient isolation. Instead of having separate digital control inputs directly on the modules like the old supply, the new system used a bus configuration where the modules all plugged into a common control board. As it turns out, we didn’t have to worry about the EMI capacitor any more, but now there was a new problem. Obviously we didn’t want to end up in the same situation again, so I started digging into the technical documents that the manufacturer provided me, including portions of their isolation diagrams and test results from the 60601 testing. “Perfect”, you might think, but that’s not quite the case and here’s where we get to the benefit of dig deeper – IEC 60601. While we were mulling over our options to fix this issue, the manufacturer introduced a new model that was also 60601-1 rated, and unlike the previous supply, was specifically billed as being suitable for Type BF applications. As it turns out, the modules were separated from each other… except for the 500V DC rated EMI (electromagnetic interference) suppression capacitor on each module that’s connected to the common chassis. This meant we needed an isolation barrier that could withstand a hi-pot test of 1.5kV RMS. Note that one of the supplies was, from a 60601 point of view, directly connected to the patient. This was exactly what we needed for a device that had a BF applied part (Type BF Applied Parts are those parts not suitable for direct cardiac application) – which must maintain safe limits to patient currents even in the presence of external voltage sources. These modules have floating outputs so, in theory, they should be completely isolated from any other module’s outputs. On one particular project we were using a modular power supply that supports a number of different modules with different voltage and current ranges. Rather than rolling our own power supply for a device, we’ll often use an off-the-shelf power supply that’s already been certified to 60601. Continued abuse of our services will cause your IP address to be blocked indefinitely.Adam MacNeil in Engineering, Regulatory | No comments Why it pays to dig deeper – IEC 60601 One of the key values at StarFish is that we “look deeper and solve the right problems.” This blog is about a situation where dig deeper – IEC 60601 saved me from potential problems later down the road. Please fill out the CAPTCHA below and then click the button to indicate that you agree to these terms. If you wish to be unblocked, you must agree that you will take immediate steps to rectify this issue. If you do not understand what is causing this behavior, please contact us here. If you promise to stop (by clicking the Agree button below), we'll unblock your connection for now, but we will immediately re-block it if we detect additional bad behavior. Overusing our search engine with a very large number of searches in a very short amount of time.Using a badly configured (or badly written) browser add-on for blocking content.
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