METRON QA-ST, User And Service Manual

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5.8 L
eak-
age
Cur-
rent
-
Lead
to
ISO
The purpose of this test is to determine the quality of isolation be-
tween the DUT chassis and all of the patient leads in series.
5. Connect Kelvin test leads in series with an ammeter and a
reference resistance to one of the patient leads
(see below).
Note that all patient leads are connected internally within the
QA-ST to the same potential.
6. Press “lead ISO”.
7. Adjust the voltage source until the ammeter displays the first ref-
erence value in the test protocol. QA-ST should display the
same value as the reference ammeter. Note the value. If the
ammeter value is not the same as the reference value, adjust
the mains using potentiometer R67.
(See Appendix A)
13