Wavecom TnT ELB G4-Series User Manual - page 7
Wavecom Instruments Portable Appliance Testers Instruction Manual
7
mode to the internal components of the DUT (Device Under Test). If these tests are done using an Insulation
Tester only and the user tests Active to Neutral, this would be a cause of potential damage, this is why the TnT
product range is far safer to use.
Some changes may be required in certain configurations where fitted surge protection devices (MOV's) in the DUT
may cause a failed test result. Applying 500V in this these situations can cause the surge protection devices to
trip, therefore conducting the applied voltage to earth, thus showing a failure of insulation. In these instances the
test voltage should be changed to 250V then retest. If DUT still fails, check with the DUT Operators Manual or an
electrician. [for details see -
‘Double Insulation Test’ 250/500VDC to change test voltage].
Under these circumstances, it would be difficult for any damage to occur to either the surge protection device or
the DUT, as there is insufficient current generated by the TnT-el appliance tester.
Leakage Test:
If there are any doubts with insulation testing of the equipment, the standard (AS/NZ3760) allows for an alternative
test method. A Leakage Test can be performed instead (The TnT
– Series are designed to perform these tests).
NOTE: 10Amps MAXIMUM Resistive Load only (Standard TNT - Series units).
A Leakage Test applies power to the Device under Test (DUT) and measures the imbalance of leakage current
from the DUT between the active and neutral conductors. The leakage is tested to the limits specified in the
standard and a Pass/Fail result as well as a digital reading is provided to ensure that the user gains as much
information as necessary.
Earth Continuity Test:
The TnT-el conducts earth continuity tests at approx. 200mA. Continuity tests at higher currents are not
required and are not recommended on certain equipment as this can cause severe damage or premature failure
to the DUT under test (as per AS/NZ3760).
3 Phase Testing: * (Note Optional Adaptor is required)
3 Phase appliances can be tested by the TnT series appliance testers. This test is carried out by using the adaptor
connection socket. As the insulation tests are from Phase to Earth, only a 500V insulation test is required. These
adaptors can be made by your electrician or purchased as an accessory.
[See ‘Optional Accessories’ for details -
when ordering please state plug configuration of 3 phase plug.]
Please note: (The TnT cannot perform 3 Phase Leakage test. Contact Wavecom Instruments Pty Ltd for
the appropriate tester).
Switching between 250V & 500V Test
To change the test voltages select the "change ins" from the options menu. Please refer to the
(Special Functions)
section of this manual.
Please Note: The TnT - Series will automatically default to 500VDC when restarted.