FIR filter: the superposed wave after filtering is displayed in this window. Two erect lines denote
the start position and end position of standard QRS wave. Click one with the left key of mouse
and it will turn blue which shows it has been selected. Here adjust its position with "←" and "→"
on keyboard, meanwhile the data of standard QRS will change, too. When the end position of
QRS wave is adjusted, the data of "Under 40 µV" and "Last 40 ms" will also change.
Click the right key of mouse to call up the setting menu.
25 Hz~250 Hz: select the transmission band 25 Hz~250 Hz;
40 Hz~250 Hz: select the transmission band 40 Hz~250 Hz;
10 uv/div: select the gain 10 uv/div;
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