SECTION 4
28
Using Filters
Filters may be enabled or disabled at any time during the patient test.
X-Scribe supports three filters:
Source consistency filter (SCF)
40 Hz filter
AC filter
Source Consistency Filter (SCF)
Mortara Instrument’s patented Source Consistency Filter (SCF) is an exclusive feature used for reducing noise
associated with stress testing. Using the morphology learned during the Pre-exercise phase or during a relearn
operation, the SCF distinguishes between noise and the actual signal in each of the 12 leads. This filtering reduces
muscle tremor noise, low-frequency and high-frequency noise, and baseline artifact while preserving diagnostic-
quality waveforms.
The default state of the filter (enabled or disabled) is determined by the selected profile. When the filter is on,
SCF© appears in the lower border of the real-time ECG display. Change the setting at any time during a stress test.
To enable/disable the SCF
1. Select SOFTKEY or press F6 to display the Softkey pop-up window.
2. To enable the filter, select the SCF© check box; to disable the filter, clear the check box.
3. Click OK to save the changes.
AC Filter
The AC filter removes line frequency noise by removing frequencies in a narrow band around 60 Hz (domestic) or
50 Hz (international). The default state of the filter (enabled or disabled) is determined by the selected profile.
When the filter is on, 60 Hz or 50 Hz appears in the lower border of the real-time ECG display. Change the setting
at any time during a stress test.
To enable/disable the AC filter
1. Select SOFTKEY or press F6 to display the Softkey pop-up window.
2. To enable the filter, select the AC filter check box; to disable the filter, clear the check box.
3. Click OK to save the changes.
40 Hz Filter
The 40 Hz filter is a plot filter, meaning that it affects only the plotted/printed information similar to a 40 Hz filter
on an electrocardiograph. The default state of the filter (enabled or disabled) is determined by the selected profile.
When the filter is on, 40 Hz appears in the lower border of the real-time ECG display. Change the setting at any
time during a stress test.
To enable/disable the 40 Hz filter
1. Select SOFTKEY or press F6 to display the Softkey pop-up window.
2. To enable the filter, select the 40 Hz filter check box; to disable the filter, clear the check box.
3. Click
OK to save the changes.
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