MECG 2.0 Test System | User Manual
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1.1 System Description
The system consists of the host PC (PC
), the “Multichannel ECG Test Unit”
(Test Unit) and the ECG device under test (DUT).
Figure 1: System Description
The PC software currently allows the user to select the waveform from one of
three sources:
CTS database (as per IEC 60601-2-25:2011)
This includes the ANE, CAL and biological waveforms as detailed in the
standard. Once selected there is no need to adjust anything.
Fixed waveforms (sine, triangle, pulse)
This allows the adjustment of amplitude and frequency by the user according
to settings on the screen. These waveforms are intended for reference only,
but could be used for some “single channel” performance tests.
Biological wav
eforms from the “Physio net” website
This allows the loading of files based on Format 16 or 212 format (other
formats may be considered on request).
Once the waveform is selected and the user presses the “Play” button, the
waveforms are streamed to the test unit. The test unit converts these to 8
analog channels of data
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at signal levels 500 times higher than the final output
(e.g. for 1mVpp output, the intermediate output is 500mVpp). These 8 signals
are then placed through a precision dividers and network as described in
Annex II of IEC 60601-2-51, to produce the low-level signals necessary for 10
lead electrodes (12 lead ECG).
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In a normal “12 lead” ECG, four of the waveforms (Lead III, aVR, aVL and aVF) can all be derived from
the other leads (Lead I, Lead II, V1 ~ V6). Therefore the so called “12 lead ECG” can be produced from
8 channels. See also IEC 60601-2-51 Annex II circuit.
ECG device
under test
(DUT)
USB 2.0
3-10 lead
electrodes
Multichannel
Test Unit
(Test Unit)
Host PC
(PC)
