User`s guide

Filters
PageWriter 200/300pi M1771A/1770A Cardiograph B-13
B
NOTE When the key is on, the user-configured combination of the Artifact,
0.5 Hz Wander, and 40 Hz Noise filters is enabled and the Filter status
message appears in the upper-right corner of the display. Refer to Table B-3
for information on configuring the key.
NOTE If accurate ST segment contours are required for ECGs recorded in Manual
mode, do not use the 0.5 Hz baseline wander filter. This filter suppresses base-
line wander to the extent that it may alter the ST segment. Instead, configure
your cardiograph to use the 0.15 Hz or 0.05 Hz baseline wander filter. Regard-
less of the filter used, the rhythm characteristics of the ECG are accurately
recorded.
)LOWHU
)LOWHU
Table B-3: Configurable Filters
Parameter
Choices
a
a. Default values are shown in boldface font.
Comments
Auto Baseline Wander Fil-
ter
0.05 Hz
0.15 Hz
0.5 Hz
Select one baseline
wander filter for Auto
ECGs.
Auto Noise Filter 40 Hz
100 Hz
150 Hz
Select one noise filter
for Auto ECGs.
Manual Baseline Wander
Filter
0.05 Hz
0.15 Hz
0.5 Hz
Select one baseline
wander filter for
Manual ECGs.
Manual Noise Filter 40 Hz
100 Hz
150 Hz
Select one noise filter
for Manual ECGs.
Artifact filter
0.5 Hz Baseline Wander
filter
40 Hz Noise Filter
Yes or No
Yes or No
Yes or No
Select whether or not
the artifact, baseline
wander and noise fil-
ters are activated by
the key.
)LOWHU
)LOWHU