Filters Menu - Saadat Dena User Manual

Chapter 2: General settings

Filters Menu

Select Filters from the Main Menu to access the below menu:
The following items can be set through this menu:

Lowpass Filter: Press to toggle between 25, 35, 75, 150 Hz and Off. This filter is used to
remove muscle artifacts and high frequency noises, yet some of the signal details might be
removed. -3dB cutoff frequency of these filters is 25 ± 2Hz, 35 ± 2 Hz, 75 ± 5 Hz and 150
± 20Hz. The frequency of the selected filter is displayed on the screen. By selecting Off,
you can disable the filter. Frequency of the selected filter is shown on the screen and header
of the recorder paper. If you select Off, the frequency will not be recorded.
Warning
Due to the significant changes in the ECG amplitude, if 25 Hz or 35 Hz and EMG filter
are turned on simultaneously, the available LowPass filters are Off, 75 Hz and 150 Hz.
Warning
During use of low-pass filter (25, 35, and 75Hz), you might lose some of useful details of
the signal..
Figure 2-4 Filter setting menu
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