January 9, 2017 08:18
Five reasons why you need the MIT2500 insulation and continuity tester
The Megger MIT2500 (122-6798) insulation tester has been launched with a series of enhancements and additions. Listening to customer feedback Megger have introduced a 2.5kV, 200GΩ insulation and continuity tester in a hand held meter. Suitable for a range of applications from motor testing to cable installation and commissioning. It represents the industry standard for hand held testing on a wide range of applications and circuits.
WHY - 2.5 kV in a hand held?
Portability of extended range instruments makes the ease and convenience of testing using the most appropriate test voltages more likely taking large bulky equipment on site.
It is not always convenient to position a large box instrument on or near the point of measurement. Hand held with a hanging option reduces the positioning problems of larger instruments almost to zero.
WHY - 1V and 10V variable voltage steps?
Selecting the correct test voltage can only improve the accuracy of the measurement. With the new Megger “Stabilised Output Voltage” of 2% +2V the actual output voltage can be adjusted almost perfectly, reducing the need to “Guess” the output voltage when selecting a test voltage in SETUP.
Example: Previously selecting 775 V test voltage would create an output voltage of 852 V. Now, selecting 775 V will generate an output voltage of no more than 792 V.
WHY - Continuity resistance with automatic reversal of polarity?
To meet European requirements for earth continuity testing EN60364 and EN61557-4 the requirement for performing continuity in both polarities must be met.
When enabled, the MIT performs a continuity test in one polarity, then reverses the measurement and makes the same measurement in the other. The result displayed is the higher of the two measurements, eg worst case.
Reason for differences in measurement
- Direction devices, such as surge protection equipment may conduct in one polarity but not in the other, providing an artificially low reading.
- Equipment left connected to the supply will frequently interfere with measurements.
- Low currents flowing in an earth circuit can significantly upset the accuracy or reported resistance of a circuit.
WHY - Update the back stand design?
If you don’t know you have never used the MIT400 series! The MIT2500 (122-6798) features a redesigned case, back-stand, and battery compartment with separate fuse access. The instruments are over-moulded and meet an IP54 weatherproof rating.
WHY - Change from 5 batteries to 6 batteries?
Six cells gives the advantage of 20% extra capacity and the higher voltage. Combined with better measurement economy the MIT2500 delivers increased battery life with better charge status feedback.
The MIT2500 (122-6798) is ideal where higher insulation test voltages are needed, such as where operating voltages exceed 1000 V.
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