Wavecom Instruments Fully Integrated Test N Print Unit - User Manual
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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 TnP 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 TnP test unit.
Leakage Test:
If there are any doubts with insulation testing of the equipment, the standard (AS/NZ3760 since 2001) allows for an alternative
test method. A Leakage Test can be performed instead. (The TnP – Series are designed to perform these tests).
NOTE: 10Amps MAXIMUM Resistive Load only (Standard TnP 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, commonly called EARTH BOND TEST:
Note: Part of normal (Class 1 test) procedure
Use supplied IEC–Croc clip lead or optional accessory ‘WCM-Probe kit’.
The TnP.500 unit conducts earth continuity tests at Approx. 200mA. Continuity tests at higher currents are not required or
recommended on certain equipment as this may cause severe damage or premature failure to the Device under test (see
AS/NZS 3760:2010).
Unique Earth Bond Test Feature
Note: Test time with the new TnP-500 series can now be user controlled. This function enables testing personnel to extend
the Earth Bond test time by 30 second increments!
This is achieved by momentarily pushing the ENTER button once, during the test.
The TnP-500 will then add 30 seconds to the test time for ENTER button press.
This feature has been incorporated to provide extra time to achieve an adequate physical connection, or confirm any possible
INTERMITTENT issues. There may be situations where the condition of equipment, coatings applied, or suspect wiring breaks
may alter the earth connection path of the device under test.
Benefit to test personnel is to save time by not having to continually repeat tests in a less than perfect situation.
3 Phase Testing: *Optional equipment required
3 Phase appliances can be tested by the TnP series appliance testers. As the insulation tests are from Phase to Earth, only a
500V insulation test is required. This test may be carried out by using the optional adaptor ‘WCM-3PH-MADP’ [See ‘Optional
Accessories’ for details.]
Note: The TnP500 series will not perform a 3 Phase Leakage test.
Contact Wavecom Instruments Pty Ltd for information on appropriate testers.
Switching between 250V & 500V Test
To change the test voltages, when in Main Menu A; Press Enter and F2 together to enter in settings. Select “Change
Insulation Vol” and press enter. Select either 250V or 500V.
Please note, TnP starts default to 500VDC, and will revert back to that when restarted.
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