GE LOGIQ 200, Руководство по контролю качества

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3-5
GE MEDICAL SYSTEMS ULTRASOUND QUALITY ASSURANCE REFERENCE MANUAL
REV 1 2262684-100
3-6 Isolated Patient Lead (Source) Leakage–Lead to Ground
This test measures the current which would flow to ground from any of the isolated ECG leads. The meter
simulates a patient who is connected to the monitoring equipment and is grounded by touching some other
grounded surface. Illustration 3-6 depicts the setup, schematically. Measurements should be made with
the ground open and closed, with power line polarity normal and reversed, and with the ultrasound console
Off and On. For each combination the operating controls, such as the lead switch, should be operated to
find the worst case condition.
Record the leakage measured on the appropriate form. The maximum isolated patient lead isolation leakage
is 10mA.
The Dale 600 provides five snap type ECG buttons for testing patient leads. Snap on all patient leads to
the meter and assure that the ground clip is connected to the system’s ground terminal. See Illustration 3-
7. Select the meter’s LEAD-GND function. Select and test each ECG lead positions (except “ALL”) of the
LEAD selector, testing each to the power condition combinations found in “PATIENT LEAD LEAKAGE”
table in the “PM CHECKLIST”. Record the highest leakage current measured for each Power selection.
Illustration 3-6 Patient Lead Test, IEC 601-1 Clause 19—Continuous
Leakage Currents and Patient, Auxiliary Currents
Illustration 3-7 Patient Lead Test
IEC 601-1 Clause 19—Leakage Currents and Patient Auxilliary Currents