Cardiograph Care and Maintenance Cardiograph Overall Sensitivity Test
2-18 PageWriter TC 70 Cardiograph Service Manual
Cardiograph Overall Sensitivity Test
The overall sensitivity test is used to test the calibration voltage. According to
IEC 60601-2-51, this test should be run regularly. Taking an ECG using a 12-lead simulator
allows you to verify areas of operation that the extended self tests cannot check, and allows
you to verify the accuracy of the sensitivity settings. This test should be run approximately
once a year.
Before You Begin
To perform this test, you need an ECG simulator that is calibrated and is able to produce a 1mV
2 Hz square wave on Lead I or II. (The lead you use is dependent on the simulator.)
Performing the Sensitivity Test
To perform the test:
1
Set the simulator to the 2Hz square wave setting and the amplitude to 1mV.
2
Ensure that the Simulated Mode feature is not enabled on the cardiograph.
3 Touch the Exam button on the Status Bar, and then touch the Resting 12-Lead button.
4 Touch the factory default Standard 12-lead Exam Profile button.
5 Touch the Settings button on the Status Bar.
a Set Artifact to OFF.
b Set Limb Leads to 10 mm/mV.
c Set Speed to 25 mm/sec.
d Touch OK.
6 Touch the ECG button on the toolbar. If a message appears that no patient information has
been entered, touch the
Continue button. Depending on how the cardiograph is
configured, the ECG may automatically print. If not, touch the
Print button.
7 Verify Lead I or II for the following items on the printed report:
– The height of the ECG pulses for the sensitivity setting
– Measure the peak of the ECG pulse and calculate the voltage for the sensitivity setting
– Verify that the measured voltage value is
1mV. Count the boxes that are contained in
the square wave from the top to the bottom, using the top left corner of the square
wave labeled
A in Figure 2-5 as the upper boundary, and the lower right corner of the
square wave labeled
B in Figure 2-5 as the lower boundary. The square wave should
measure
10 mm (10 boxes) with a + 5% margin for error.
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