Hioki 3155-01, Instruction Manual

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Appendix 2 Leakage Current Measurement
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2.1.4 Patient Leakage Current
Faulty equipment
3155
Changeover box
Insulating
transformer
Signal input or
output part
Equipment to
be measured
Applied part
Patient induction
cord or equivalent
Human body
Leakage current
Patient leakage current concept diagram
3-P outlet
9196
Signal input or
output part
110% voltage applied
3155
Changeover box
Insulating
transformer
Leakage current
Measurement network
Ｇ
Ｔ１
Ｔ２
Applied
part Equipment to
be measured
Red 9170
TEST LEAD
Patient leakage current wiring diagram
The term ’patient leakage current ’ refers to leakage current that flows from
the applied part of the equipment to be measured, through an induction cord
and the body of the patient connected to the equipment to be measured via the
induction cord, and into the earth, when a malfunction of the external
equipment connected to the signal input or output part of the equipment to be
measured results in ordinary commercial voltage being applied to the signal
input or output part of the equipment to be measured.
The 3155 connects the measurement network between the applied part of the
equipment to be measured and the earth with a single 9170 TEST LEAD,
and measure the current. Voltage application to the signal input or output
part of the equipment to be measured is made with the 9196 APPLY UNIT or
equivalent device.