MECG 2.0 Test System | User Manual
5
1
Introduction
The WhaleTeq Multichannel ECG Test System provides a full 12 lead
waveforms for testing diagnostic, ambulatory or monitoring ECG, for testing to
IEC particular standards.
Version 1.0 was designed according to the circuit in IEC 60601-2-51, modified
by using precision, low offset op-amps (<0.5µV) and 0.1% resistors in the
output divider circuits and networks to provide greater accuracy. For Version
2.0, released in November 2012, the IEC 60601-2-51 circuit was further
modified with DAC compensation
1
and electronic Wilson Terminal offset
2
to
further improve the accuracy of the system in the very low voltage area, for
example, to ensure an accurate ST segment in V1 ~ V6 around 200µV. Both
versions are identical from the user interface.
The standard range is ±5mV to cover the waveforms in IEC 60601-2-25:2011.
Systems with wider ranges can be provided on request.
The system makes use of continuous streaming of digital data over a USB
connection, with test unit providing a stable real-time output with crystal
oscillator accuracy and internal checks to ensure that no data is lost.
All waveforms are looped to the beginning when the end of the file is reached.
The system has embedded
3
the CAL, ANE and biological ECG waveforms from
the CTS database referred to in IEC60601-2-25:2011 (formerly IEC 60601-2-
51).
A custom design module has been developed to work with a large number of
waveforms from Physio net website (Format 16 and Format 212), including
directly linking with the website and downloading the necessary files.
It is expected that users will have specific applications and waveforms for
testing the equipment. Contact WhaleTeq (
) for a
custom designed PC software to interface between the waveforms required
and the USB module.
1
Applied to the ±2.5mV range, to cover all CAL, ANE waveforms except CAL30000 and CAL50000.
2
In the recommended circuit of IEC 60601-2-51, the Wilson Terminal offset is provided in hardware. This
configuration was found to add errors in V1 to V6 of up to 20µV.
3
The term “embedded” here means the raw digital data is embedded in the software and cannot be
accessed directly. Raw digital data cannot be released due as it is propriety data.
