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Single Channel ECG Test System | User Manual
2.6.8
Special functions
Baseline reset test (sine wave only): When checked the
parameters are ignored and a large signal of 1Vpp
(0.354Vrms) is applied
. It is intended to test the ECG’s
response to overload, in particular automated resetting
of baseline (due to high pass filtering). When unchecked,
the system reverts to the previous settings (e.g. 1mVpp
10Hz signal). Mains frequency of the test can be selected
from 50Hz or 60Hz.
Mains noise (ECG 2-27 waveform only): When checked
adds small sine wave at mains frequency of 50Hz or 60Hz.
Range is from 0.05 ~ 0.2mVpp (additional range added
for EC 13).
Note: settings of 80Hz and 100Hz are used for calibration
of capacitors only, not intended for testing ECGs
AAMI EC 13 Drift test (ECG 2-27 waveform only): when
checked adds 4mVpp 0.1Hz triangle waveform to the
ECG signal (for testing baseline drift).
Dynamic Range Test (square wave only): when checked
adds a 1mVpp waveform at the frequency indicated (20,
30 or 40Hz), intended for combination with an adjustable
square wave for testing Clause 51.107.2 in IEC 60601-2-
51.
Frequency scans:
Sine: may be used with IEC 60601-2-51 tests or to test
systems with extended frequency response. This system
uses a fixed sampling rate of 5kHzwhich has been found
to reduce problems of beating from other digital sources.
If beating still occurs, a separate analogue input at BNC1
is provided to allow testing with analogue type function
generators.
ECG: can be used for testing IEC 60601-2-27 heart rate below 30bpm as indicated in
the standard (0~30bpm over 30s).
As a frequency of “0” is infinitely long, the scan
starts at 3bpm.
