Resistance range . . . . . . . . 0 through 1,000 megohms.
Test potential..................... 500 volts dc 5 percent (when
insulation condition of telephone cables, of trans-
measuring values below 2
formers, between windings and ground of rotating
megohms, the voltage drops
equipment, and of all other types of electrical
equipment for which insulation resistance is an
Accuracy . . . . . . . . .. Within 1 percent of any car-
b. The ohmmeter applies
a high potential
Insulation resistance above 1,000 megohms
equipment under test in order to detect low in-
is indicated by a point marked infinity
satisfactorily on a low potential ohmmeter.
on the meter scale.
use of the ohmmeter can minimize
Comprising an Operable Ohmmeter ZM-
failure in circuits or equipment caused by faulty
insulation. A sudden lowering of insulation
Refer to table 1-1 for items comprising an operable
resistance indicates a fault that should be in-