Philips EPIQ 7 User Manual page 235

TEE Leakage Current Test
Electrical Safety Check for TEE Transducers
TEE Leakage Current Test
Symbol
C
Z
A
e
I
EPIQ 7 User Manual 4535 617 25341
Definition
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 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)
Microammeter to measure third-wire current, either directly from the chassis or
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
Transesophageal Transducers
235