Electrical Safety Check for TEE Transducers
TEE Leakage Current Test
Symbol Definition
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 TEE 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 third-wire current, either directly from the chassis or
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
TEE Leakage Current Test
Transesophageal Transducers
EPIQ 7 User Manual 4535 617 25341 235
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