GE MAC 1600, Operator'S Manual

Page: 55 / 162

Recording a Resting ECG
2028451-182B MAC™ 1600 5-5
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 will be 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 Pace Enhance Improves the readability of pacemaker ECGs. Options
are On and Off.
F Key Option Description