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Quality is crafted into every Major MEGGER® Insulation Tester, with
excellent test voltage regulation, direct measurement readout and an
external guard terminal to eliminate surface leakage current from the
measurement. Five models are available for general purpose testing
which include a low-voltage model. All are portable, self-contained
instruments designed to give rapid and accurate measurements.
Four of
the models feature an analog display having four selectable test
voltages of 100, 250, 500 and 1000 VDC, measuring insulation resistance
up to 2000 MΩ,and an ohm range to 5000 ≈. The other model has four test
voltages of 50,100, 250 and 500 VDC measuring insulation resistance
up to 1000 M≈.The only other difference between the five analog models
is the type of power source. Power for models 212159 and 212160 is derived
from a low-voltage, hand cranked generator which has been designed to
be easy to turn even under full load conditions. The low-voltage
generator is connected to an electronic inverter to provide a very
stable test voltage. Accuracy of measurement is unaffected by variations
in the generator cranking speed and the test voltage is maintained at
its rated value. Power for model 212359 is provided by 120 V ac 50/60 Hz
or low-voltage generator.
Model 212559 is also 120 VAC 50/60 Hz or
internal rechargeable batteries and model 212459 is powered by
6replaceable "AA" alkaline cells. As a safety feature, the ac voltage
range becomes effective as soon as the instrument is connected to the
circuit under test. Therefore, a warning is given that the circuit
under testis not de-energized before the instrument is operated.
Though
calibrated for ac voltage, this range also monitors the automatic
discharge feature so that after equipment having capacitance (i.e. a
cable), has been tested, an indication can be given that the voltage
has discharged to a level that is safe for removing the test leads. |
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