GE MAC 800, Operator'S Manual

Page: 67 / 154

Arrhythmia Mode Recording
Function Key Option Description
F3
Gain Changes the magnitude of the ECG signal on
the display or in the report. Measurement is in
millimeter per millivolt (mm/mV) and includes
the following options:
• 5 mm/mV
• 10 mm/mV
• 20 mm/mV
• 40 mm/mV
• 2.5 mm/mV
• Automatic
The larger the selected measurement, the larger
the waveform appears. Only the appearance of
the waveform changes; signal strength is not
affected.
NOTE:
If Automatic is selected, the system
calculates the best gain based on the
peak-to-peak amplitudes of all displayed
leads and the selected display format.
F4
Filter Eliminates noise in the waveform by restricting
which frequencies are included. Frequencies
are measured in Hertz (Hz) and include the
following options:
• 20 Hz
• 40 Hz
• 100 Hz
• 150 Hz
Selecting a frequency eliminates signals
that exceed that frequency. The smaller the
frequency selected, the more signal is filtered
out. For example, a filter of 40 Hz displays only
signals at 40 Hz or less; signals greater than 40
Hz are ignored.
CAUTION:
INACCURATE READINGS — Using the filter
can result in a cleaner waveform, but
selecting a frequency that is too low could
alter the waveform’s morphology, resulting
in an inaccurate reading.
To avoid this, use the filter only to eliminate
excessive noise and use the highest
frequency that provides a readable
waveform.
F5 ADS
Toggles the anti-drift system ( ADS ) on and off .
ADS helps reduce baseline drift.
F6 More Toggles through the softkey options.
2060026-001C MAC™ 800 67