Philips iU22 - Electrical Safety Check for TEE Transducers

Electrical Safety Check for TEE Transducers
TEE Leakage Current Test
DefinitionSymbol
Stray capacitance from the ultrasound system power wiring to
the system grounded metal chassis (1 to 3 MΩ reactance)
C
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)
Z
Microammeter to measure third-wire current, either directly
from the chassis or through Z to the test electrode
A
Line power source, either 110 Vac or 220 Vace
Current caused by e and stray capacitance, and optionally ZI
Open earth lift ground switchS1
iU22 User Manual
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Transesophageal Transducers
10