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Single Channel ECG Test System | User Manual
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1.1
Introduction
Basic concept
The WhaleTeq Single Channel ECG Test System 4.0 provides a single waveform to
one or more lead electrodes of diagnostic, ambulatory or monitoring ECGs, for testing
to IEC particular standards. The following diagram shows the single channel concept:
RA
LA
LL
RL
V1
ECG device
under test
V2
V3
V4
V5
V6
(Figure 1) Single channel concept
Via a SECG 4.0, the system produces arbitrary waveforms (streamed from the PC
with digital to analogue conversion) at up to ±5V, which is then applied to a
precision 1000:1 divider to produce the voltages at up to ±5mV level (10mVpp).
The SECG 4.0 contains resistor/capacitor networks, dc offset, pacing circuit and
relay switching to provide the full range of single channel performance tests in IEC
standards as described in Section 1.1.2.
The basic range of tests in the standards include, for example:
- Sensitivity (accuracy of the mV/mm indication)
- Frequency response (sine wave, and impulse tests)
- Input impedance
- Noise
- Multichannel cross talk
- Accuracy of heart rate indication
- Pacemaker rejection
- Tall T-wave rejection
For a full list of tests, refer to the standard together with Section 1.2.
The system does not provide:
- CMRR tests (this requires a special noise free box, available from WhaleTeq)
- Multichannel waveforms, such as the CTS Atlas, CSE, AHA, MIT databases
(this requires a multichannel system, available from WhaleTeq)
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