Test Box checks accuracy of electrical test instruments.
December 18, 2008 -
Designed to test and certify electrical installations, Model MTB7671 is capable of checking insulation, continuity, loop, and RCD testers. Unit ensures that instruments are delivering accurate results, and are capable of meeting requirements of 17th Edition of IEE Wiring Regulations. Test functions are color-coded, and pass/fail limits are incorporated for all parameters where such limits are published.
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Original Press release
Megger
4271 Bronze Way
Dallas, TX, 75237
USA
Megger Guards Against the Rigours of Industry
With Megger's new MTB7671 instrument test box, checking the accuracy of instruments used in testing and certifying electrical installations is a fast and straightforward task. This is of particular benefit to users in industry, where test equipment is frequently subjected to harsh operating conditions and demanding environments that have the potential for affecting accuracy.
A convenient and comprehensive solution for evaluating the performance of instruments between regular calibrations, the MTB7671 provides complete confidence that instruments are delivering accurate results and are, therefore capable of fully meeting the requirements of the 17th Edition of the IEE Wiring Regulations.
Designed specifically to address the shortcomings of existing test boxes, which typically check only the primary functions of instruments, Megger's new MTB7671 checks all vital parameters such as, for example, the voltage applied by the instrument during insulation and continuity testing.
Not only are the limits for these parameters laid down in the IEE Wiring Regulations and EN61557 which is called for in the 17th Edition, making them a mandatory part of the test procedure, they also have a huge effect on the validity of test results. For example, if the insulation test voltage is too low, defective insulation may register as satisfactory - with potentially dangerous consequences.
The MTB7671 is capable of checking insulation testers, continuity testers, loop testers and RCD testers. Test functions are colour coded to ensure ease of use, and pass/fail limits are incorporated for all parameters where such limits are published. Instruments can, therefore, be checked quickly against a series of simple pass/fail indications.
For insulation testers, the MTB7671 provides confirmation that the instrument is producing the correct voltage and current, as well as checking calibration at five values from 0.25 megohms to 90 megohms. Continuity testers are checked for correct output voltage and current, and for accuracy of resistance measurement at 0.5 ohm and 5 ohm.
When checking loop testers, the MTB7671 provides a direct loop measurement from the outlet socket, which can be measured either with a trip or a no-trip test. It also offers loop plus 1 ohm and loop plus 180 ohm checks for verifying that instruments will give reliable results in TT installations. For RCD testers, the MTB7671 provides RCD values of 10 mA, 30 mA and 100 mA. For each value, the five standard tests can be performed.
The test box is also provided with 230 V output terminals to provide a quick check for instruments with voltage-measuring ranges, and its special design means that it can be safely used with either standard or RCD-protected supplies without the risk of tripping the supply.
For further information:
Mark Johnson,
Megger
Archcliffe Road, Dover, Kent, CT17 9EN
Tel: +44 (0) 1304 502100
Email: mark.johnson@megger.com
Web: www.megger.com
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