4
Leak current measurement
for medical equipment
Medical equipment leak current includes not only
ground leak current and exterior leak current, but
also patient leak current (I to III) and patient
measured current. The 3156 can measure all of
these different types of leak current without any
additional equipment.
IEC standard
[ IEC 60601-1 ('88) + am1 ('91) + am2 ('95) ]
UL standard
[ UL 2601-1, others ]
The 3156 does not have a built-in
insulated transformer. When
measuring
medical equipment, use a step-up insulated transformer or other
device to provide 110% of the rated voltage as the line power
supply for the equipment being tested.
The standard numbers that are listed are only examples. The
JIS standard
[ JIS T 0601-1, others ]
Leak current types and Network types
For medical equipment
Medical equipment leak current types
Faulty medical equipment
Faulty medical equipment
1kΩ
±0.1%
Signal input section
Medical equipment
Patient leakage
current III
Patient leakage
current II
Basic measuring element
Patient leakage
current I
Earth leakage current
10kΩ±0.1%
1kΩ
±0.1%
Enclosure leakage
current
0.015µF
±1%
Earth leakage current
A current flowing from the power supply through the interior or surface of
the insulation to the protective ground line.
Filter on
Enclosure leakage current
A current flowing from a part of the enclosure which during normal use can be
touched by an operator or patient either to ground or to another part of the
enclosure, through an external conductor other than the protective ground.
Patient leakage current
A current flowing from the device through the patient to ground.
Patient auxiliary current
A current flowing between contacts which during
normal use are connected through the patient, with
no intended physiological effect.
ASM-SENSOR [ ASM GMBH ]
