Fluke Biomedical DALE601 - Manual (Page 37)

Operation
Measuring Leakage Current
2
2-13
pathways directly to the heart, but it has become standard for all devices
having any patient-applied parts.
This test simulates the condition of a patient with leads attached touching
ground such as an electric bed. If the patient connections are not isolated, this
current reflects the earth current when tested under the open ground condition,
as this is its only path back to true earth. For devices incorporating isolated
patient connections, this current is reduced by the patient isolating impedance
Z
I
, a combination of resistive and capacitive leakage.
Measurement is made to the lead selected by the lead selector switch, with the
other side of the AAMI load connected to system ground.
To measure patient lead leakage:
1. Connect the patient leads to the corresponding universal connectors on the
front of the Analyzer.
2. Set the FUNCTION switch to PATIENT LEAD LEAKAGE.
MAI N S V OLTAGE
CURRE N T AMPS
EARTH RESISTA N CE
EARTH LEAKAGE
E N CLOSURE LEAKAGE
PATIE N T LEAD LEAKAGE
PATIE N T AUX CURRE N T
M.A.P.
EXTER N AL
fcu08.eps
The leakage current displays in µA.