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Wavecom Instruments Fully Integrated Test n Print Unit User Manual

Testing of Electrical Equipment

Many testing personnel have some reservations in testing sensitive, electronic equipment using a 500V DC

insulation test. There is a perceived fear of causing internal damage from over voltage. With the introduction on

the TnP Range of appliance testers, these concerns are alleviated.

The TnP Range of electrical portable appliance testers is safe to test electronic equipment as the tests are

carried from Active-Neutral (shorted by a relay inside the tester) to Earth. No dangerous voltages pass through in

this 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 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-Probekit’.

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.

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