Some of the available standards for electrocardiographs (ECGs) (for example, OIML R 90) were intended for analog instrumentation. Modern ECG units are entirely digital: after amplification, analog-to-digital conversion is performed, and all necessary functions are software-implemented. Checking or measuring metrological characteristics of the new generation ECGs requires different approaches. A testing sequence of triangular pulses is proposed, mixed with voltage derived from the power-line source and with a low-frequency sine wave simulating baseline fluctuations. This sequence can be used for assessment of the ECG preprocessing functions (power-line interference and drift suppression), as well as for the high-pass time constant and upper frequency cut-off estimation. Examples are given using ECGs developed by the authors.
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Dotsinsky et al. (1996) studied this question.
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