![]() ![]() This noise may come from an unstable dc offset from electrode/body interface, muscle noise, mains hum (50/60Hz), electrical noise from equipment in the environment and from within the ECG equipment itself, such as from internal dc/dc converters.Ī filter works by removing or reducing frequencies where noise occurs, while allowing the signal frequency through. In general, filters try to remove unwanted noise. Especially in ECG work, the signal levels are very small (around 1mV), so it is necessary to use filtering to remove a wide range of noise. Section 1: The technology behind filters What is a filter? Most test engineers covered filters at some point in their education, but that knowledge may have become rusty over time, so the following includes some information to brush up on filter theory while heading into the specifics of ECG filters. Also, it is not unusual to find that some tests fail with specific filter settings. This section is intended to give some background on the filters and the effect of filters, so test engineers can decide which filter settings are appropriate. ![]() ![]() One option is to test all filters, but this can be time consuming. In some clauses the standard indicates which filter(s) to use, but in most cases, the filter setting is not specified. ![]() ECG filters can have a substantial effect on the test results in IEC 6, IEC 6 and IEC 6. ![]()
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