Key to Source Test Diagram
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
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 leakage current
from the transducer to the earth lift ground
through Z to the test electrode
A
Line power source, either 110 Vac or 220
Vac
e
Current caused by e and stray capacitance,
and optionally Z
I
Open earth lift ground switchS1
Line polarity switchS2
Line mains supplyL
Neutral mains supplyN
Earth groundE
219
iU22 User Manual
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9
Intraoperative Transducers
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