Philips EPIQ 7 User Manual page 194

Intraoperative Transducers
Test 1: Leakage Current Test with Mains Voltage Applied (Source) for Intraoperative Transducers
Key to Source Test Diagram
C
Z
A
e
I
S1
S2
194
Stray capacitance from the ultrasound system power wiring to the system
grounded metal chassis (1 to 3 MΩ reactance)
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)
Microammeter to measure leakage current from the transducer to the earth lift
ground through Z to the test electrode
Line power source, either 110 Vac or 220 Vac
Current caused by e and stray capacitance, and optionally Z
Open earth lift ground switch
Line polarity switch
Leakage Current Testing for Intraoperative Transducers
EPIQ 7 User Manual 4535 617 25341