Patient Leakage – F-Type
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The Patient Leakage F-Type Test (also known as mains on Applied Parts test) displays the current that would
flow if a mains potential was applied to the Applied Part which was attached to a patient (i.e. a single fault
condition). The Analyser detects any current flowing in the Applied Parts Lead (attached to an appropriate point
on the appliance). This test is applied only to type BF and CF equipment. The Analyser displays the result in
milliamps (mA).
To change the test duration, press the SELECT key and then UP or DOWN keys. The user can also select the
type (BF, CF) by pressing SELECT again and then pressing the UP, DOWN keys.
The user must select the applicable Patient Connection or Applied Part prior to commencing the test. When the
test duration is set to UL (unlimited), the user can toggle between different Patient Connections as required to
take the individual measurements.
The selection of normal or reverse operation and single fault conditions (neutral or earth open circuit) is done
automatically during the test (with the exception of the earth bond probe which is internally connected to earth
during the entire test sequence). The current test sequence step is shown on the lower display. Should a test
fail, the Analyser will stop the automatic test sequence. For Class II equipment, the Single Fault Earth Open
tests are skipped. The test sequence is shown below:
Test Sequence
Mains
Single Fault
Class I / 2
Condition
1. nS
Normal
Mains on AP –
Normal
2. nSr
Normal
Mains on AP –
Reversed
EUT Power Break
3. rS
Reversed
Mains on AP –
Normal
4. rSr
Reversed
Mains on AP –
Reversed
The user can select unlimited test duration. In this instance the user must press the Start button to stop testing.
The Start button must be pressed again to initiate the next test in the test sequence.
