Instruction manual

13
Leakage Test
The Leakage Test is an alternate method to perform insulation resistance tests. Leakage testing is a major function of the TnT-
el & TnT+ models
Please Note: A visual inspection test must be carried out before any others (refer to First Test Section)
This test determines errors of leakage not otherwise detected in a normal insulation test. If there are any doubts with insulation
testing of the equipment, the Standard (AS/NZS 3760 since 2001) allows for a leakage test to be carried out instead. The TnT-
el & TnT+ appliance testers have been designed to perform these tests. The Leakage Test applies power to the Device Under
Test (DUT) and measures any imbalance or leakage current. The leakage is tested to the limits of the class types specified in
the Standard AS/NZS 3760 ie. Class 1 = > 5mA as Fail.
The Limit of imbalance measured on the TnT-el appliance tester will read well in excess of the limits set in mA. However, should
the supply circuit be protected by an RCD this device will trip any where between 10 to 30mA and trip the mains supply switch
OFF.
Procedure:
1. Complete a Visual Inspection on the DUI (Device Under Test). For details refer to the First Test section. If the DUT
passed the Visual Inspection, continue with the following instructions, if not, refer to the First Test section.
2. Press the return key to view menu 2.
3. Press a function key (as follows) to start the test/s. Press either F1, F2 or F3 depending on the type of DUT you are
testing). F1 = Earth Leakage, limit set to MAX then 5mA fail. F2 = D/insulated leakage and ext leads, limit set to MAX
then 2.5mA fail. F3 = RCD leakage.
CONFIRM SAFE TO CONTINUE? OK/QUIT. IF OK, DEVICE WILL TURN ON. ENSURE SAFE OPERATION!
4. Results are displayed, read and record appropriately.
5. Unplug DUT.
6. Press Enter until you return to the main menu.
If the result was a pass - Tag the DUT with the appropriate tag including "next test due" date and "return to service".
If the result was a fail - Tag the DUT wit a danger tag and remove the DUT from service.
Please Note: Test will pass even if DUT is not plugged in.
The Leakage Test allows the user to operate the DUT in normal operation conditions and measure its Operating Leakage
current. The displayed parameter is mA. The mA Display Range 0.0 to 22.0 mA.
A predefined value for individual class types is programmed into your TnT-el & TnT+ appliance testers. These limits are set
according to the AS/NZ3760. Should these values change in future it can be simply altered in firmware. A Pass / Fail will also
be displayed at the end of the test.
The run time period can be adjusted (by 5sec increments). The value can be changed by selecting the leakage test time in the
options menu. See the special functions section of the manual for more details. The factory default setting is 20sec. The value
for the leakage runtime is also used for the power test (plus models only).
Before operating ensure the equipment is firmly secured to eliminate the possibility of causing injury or damage. This
function turns the DUT on, any rotating devices have clearance from body or object. Appliances may jump off benches
or cause serious damage if not secured properly.
To stop operation press the return/enter key at any time. The unit will power down after 20 seconds as factory default