Test 1: Leakage Current Test with Mains Voltage Applied (Source) for Intraoperative Transducers
Key to Source Test Diagram
C Stray capacitance from the ultrasound system power wiring to the system
grounded metal chassis (1 to 3 MΩ reactance)
Z Impedance between the metal parts of the transducer and a test electrode placed
in the bucket of saline solution (about 850 kΩ with an intact outer insulating layer,
500 Ω with a hole in the layer)
A Microammeter to measure leakage current from the transducer to the earth lift
ground through Z to the test electrode
e Line power source, either 110 Vac or 220 Vac
I Current caused by e and stray capacitance, and optionally Z
S1 Open earth lift ground switch
S2 Line polarity switch
Intraoperative Transducers
Leakage Current Testing for Intraoperative Transducers
194 EPIQ 7 User Manual 4535 617 25341
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