Filters Menu - Saadat DENA 650 User Manual

Chapter 2: System 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: available options are Off and 25, 35, 75, 150 Hz. This filter is used to remove
muscle noise and high frequency noise. These filters make the heart signal smoother and cleaner.
The selected filter type or frequency is displayed on the screen and in the record paper. If you select
the Off option, this filter will be disabled.

HUM Filter: available options are Off and On. The function of this filter is to eliminate the effects
of local AC frequency on the signals. By selecting the On option, the phrase "HUM" will be inserted
on the screen and the record paper, and if the Off option is selected, the phrase on the screen and
the record paper will not be displayed.
This filter is automatically adjusted according to the AC power frequency (50 or 60 Hz) if it is On

Drift Filter: available options are On and Off. This filter reduces signal fluctuations (base line
wandering) that are mainly due to the patient's breathing and movement. By setting Drift filter: On,
the phrase "0.5" and otherwise "0.05" is displayed on the record screen and paper.

EMG Filter: available options are On and Off. This filter is used to remove muscle noise. By setting
On, the phrase EMG is displayed on the screen and in the record paper.
Figure 2-4 Filter setting menu
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