Bionet CardioCare EKG2000, Руководство по обслуживанию

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C7SM-1.01
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Service Manual of Cardio 2000
3-3. Filter Setting
AC power noise, base line drift caused by breathing , EMG signal can be recorded along with
the output ECG signal. To set the AC noise filter, move to “FLT” menu to call up “AC” menu and
press key. key toggles between off, 50hz, 60hz. Off indicates that filter does not
suppress ac interference. As for 50Hz or 60Hz, filter suppresses 50Hz or 60Hz AC power noise. In case
of battery power, ECG signal is clear only with Off setting because AC noise interference hardly
exist. The selection is 50Hz for most of Europe and 60Hz for USA and other countries. The selected
setting is shown on the bottom line of the output form indicated AC 60Hz, AC 50Hz or AC OFF
Base line drift is caused by patient breath. Base line drift filter can be set by pressing key.
BASE key switches on or off. off, 0.05, 0.1 or 0.2Hz indicates base lien filter is applied or not.
The selected setting is shown on the bottom line of the output form indicated by „0.1hz-„ as for filter
on and „0hz-„ as for filter off.
EMG signal is induced from muscle and internal organs of the patient.
For clear ECG signal output, it is necessary to eliminate EMG signal interference.
EMG filter can be set by pressing MUSC key. MUSC key switches on or off.
On or off indicates EMG filter is applied or not. The selected setting is shown on the bottom line of
the output form indicated „EMG:On‟ or „EMG:Off
Low pass filter can be selected to optimize ECG signal after applying above three filters and if
ECG signal is still interfered. To set the low pass filter, move the menu to “FLT” to call up “LPF” menu
and press key. key toggles between off, 40hz, 100hz, 150hz. As for 40Hz, it indicates
filter suppresses higher frequency than 40Hz. The selected setting is shown on the bottom line of the
output form indicated by „Off„ as for off, by‟-40hz‟ as for 40hz, by‟-100hz‟ as for 100hz, by ‟-150hz‟ as
for 150hz.
To apply filter could result in ECG distortion. So, filter should be appropriately applied to reduce
the fluctuation without affecting the ECG signal when output signal is badly interfered only.
For your reference, base line file and ac filter should be always active and EMG filter can be
applied appropriately. It is recommended for LPF to set 150Hz during diagnosis.