GE MAC 1600 Operator's Manual page 55

2028451-182B
F Key Option
F3 Gain
F4 Filter
F5 Pace Enhance
MAC™ 1600
Description
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.
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.
Improves the readability of pacemaker ECGs. Options
are On and Off.
Recording a Resting ECG
5-5