Filters - Schiller AT-101 User Manual

AT-101
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General
Lead
Interpretation
Filter
Auto. Format 2 external
Auto. Format 1 external
external
Auto Format 2 internal
Automatic Format 1
internal
ECG Settings
Parameter
Baseline filter
Myogram filter
Myogram filter
Mains filter
Baseline Stabiliser
(SCHILLER SBS)
Smoothing Filter
(SCHILLER SSF)
User Guide
5.2.3

Filters

There are five different filters which can be set individually as follows.
Options
0.05, 0.15 or 0.3 Hz
25 or 35 Hz
On at power up
Off at power up
Off
50 Hz
60 Hz
Off/On
Off/On
Description
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 ab-
solutely necessary, as the possibility exists that they could affect the ori-
ginal ECG signal, especially the ST segments.
The Myogram filter suppresses disturbances caused by strong muscle tre-
mor. 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, 'FILTER ON' is displayed in the information
box.
The cutoff frequency is user defined at 25Hz or 35Hz. When 'off at power
up' 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.
Selection if filter is standard switched on or off during power up.
The mains filter is an adaptive digital interference filter designed to sup-
press ac interference without attenuating or distorting the ECG.
Set the mains filter in accordance with the frequency of your local mains
supply.
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).
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, 'SSF' is shown on the bottom line of the automatic
printout.
Setup 5
ECG Settings 5.2
Page 37