Schiller AT-101, Service Handbook

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3 Operation
3.3 ECG Settings
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3.3.3 Filters
There are five different filters which can be set individually as follows.
Parameter Options Description
Baseline filter
0.05, 0.15 or 0.3 Hz
The set value is the lower limit of the frequency range and is normally
set to 0.05 Hz. The settings 0.15 and 0.30 Hz should only be used when
absolutely necessary, as the possibility exists that they could affect the
original ECG signal, especially the ST segments.
Myogram filter
25 or 35 Hz
The Myogram filter suppresses disturbances caused by strong muscle
tremor. The filter is applied by pressing the FILTER key (or programmed
on as default when the unit is switched on).
When the Myogram filter is on, kFILTER ONk is displayed in the information
box.
The cutoff frequency is user defined at 25Hz or 35Hz. When koff at power
upk is selected, the Myogram filter is off when the unit is first switched on.
Note
An ECG recorded in auto mode is stored unfiltered. It is therefore possible
to print the stored ECG either with or without passing the myogram filter.
Filter ON is indicated on the LCD.
Myogram filter
On at power up
Off at power up
Filter status selectio at power up.
Mains filter
Off
50 Hz
60 Hz
The mains filter is an adaptive digital interference filter designed to sup-
press an interference without attenuating or distorting the ECG.
Set the mains filter in accordance with the frequency of your local mains
supply.
Baseline Stabiliser
(SCHILLER SBS)
Off/On
The baseline stabiliser greatly reduces the baseline fluctuations without
affecting the ECG signal. The purpose of the stabiliser is to keep the
ECG signals on the baseline of the printout. This filter is only effective in
auto mode printout. The Baseline Stabiliser is applied to a recording
(on), or not applied to a recording (off).
Smoothing Filter
(SCHILLER SSF)
Off/On
The smoothing filter (SSF: SCHILLER smoothing filter) is a low pass filter
to suppress high frequency artefacts between the QRS complexes. When
this filter is switched on, kSSFk is shown on the bottom line of the automatic
printout.
General
Lead
Interpretation
Filter
Auto. Format 2 external
Auto. Format 1 external
external
Auto Format 2 internal
Automatic Format 1
internal
ECG Settings
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