The name suggests itself, 3 Channel ECG Machine prints three waveforms/channels simultaneously.
In 3 channels machines, the machine selects the ECG signals by the microprocessor are amplified, filtered and then sent to a three-channel multiplexer. The multiplexed analogue signals are then given to an analogue to digital converter, stored and transmitted to a digital to analogue converter for reconstructing the analogue signals. These signals are de-multiplexed and passed to the chart recorder / Printer or video display to display the same.
A three-channel ECG machine print 12 waveforms in 4 sections. Such report format is called 3x4 format. 3 Channel ECG Machine also print a rhythm lead in some scenarios.
Three-channel ECG Machine prints three waveforms at a time on the charting paper 1st section waveform (I, II, II)
3 waveform in the 2nd section ( aVR, aVL, aVF )
3 waveform in the 3rd section ( V1, V2, V3 )
3 waveform in the 4th section ( V4, V5, V6 )
Printing all the 12 waveform takes 4 slots on the ECG chart paper (Also called 3x4 format ).
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