KaVo ORTHOPANTOMOGRAPH OP 3D Service Manual page 156

8 Part replacement instructions
Verifying protective earth path to the accessible parts test
points
Principles of the measurement set-ups
1. Measuring circuit for the measurement of protective earth resistance in device with
permanent installation to mains
2. Measuring circuit for the measurement of protective earth resistance with detachable
power cord.
Measuring earth resistance to accessible conductive parts
NOTICE! The mains power supply cord must be attached to the device.
With detachable power cord:
1. Measure protective earth resistance between the mains power supply cord plug's
earth contact and the two measurement points a (Board mounting plate fixing screw)
and b (Screw under the lower shelf) shown in figures below:
156 ORTHOPANTOMOGRAPH
™
OP 3D