Philips HD11 XE - Figure 12-3 Test 1-Transducer Leakage Current Test (Source)

Intraoperative Transducers
HD11 XE Getting Started
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Figure 12-3 Test 1—Transducer Leakage Current Test (Source)
Key:
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 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 leakage current from the transducer to the Earth
Lift Ground 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
S1 Open Earth Lift Ground switch
S2 Line polarity switch
i
Ultrasound system
(metal chassis)
Saline
A
L
S2
S1
N
E
C
Test container
(nonconductive)
Test electrode
Intraoperative transducer
immersed in saline solution
Z
e
i