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Electrical Resistance Tester.
Electrical Resistance Tester
The electric resistance of helmets is measured by applying a high
voltage between an electrode placed in salt solution kept inside the
helmet and another electrode placed in a salt solution bath in which the
helmet is placed in inverted position. The voltage is slowly increased
to the specified value and the current passing between the two
electrodes measured for evaluating the electrical resistance of the
helmet under test.
The Electric Resistance Tester for
helmets consists of a plastic container with an acrylic frame placed in
its center for keeping the helmet under test on. The two electrodes are
held in suitable clamps, one located inside the helmet and the other in
the bath.
A high voltage source is provided with the equipment
for supplying the test voltage. It consists of a variac, a step-up
transformer, a digital voltmeter, and a digital mili-ammeter with a
pre-settable tripping currents.
All the parts used in the tester are made from materials that do not get affected by salt solution used for conducting the test.
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