Conventional Multimeter Or Ohmmeter; Digital Ohmmeter/Multimeter; Ammeter And Voltmeter - A.O. Smith ST1302 Manual

Pump Motors

CONVENTIONAL MULTIMETER OR OHMMETER

An ohmmeter can be used to measure the resis-
tance of the various motor windings as well as to
test the insulation.
The ohmmeter will have numerous ranges from
R x 1 where the meter reads directly in ohms to
an Rx100K where the actual meter reading must
be multiplied by 100,000 for the actual ohm
value.
Before using an ohmmeter:
Make sure all motor leads are disconnected
from the power source.
Make sure the meter is adjusted to zero
before taking each reading.
All troubleshooting checks specify the ohm-
meter range to be used. If your meter does
not have the exact range, use the next higher
range.

DIGITAL OHMMETER/MULTIMETER

Direct reading digital ohmmeters are readily
available in the field. To use this type:
Make sure all motor leads are disconnected
from the power source.
Read instruction manual for the meter.
You do not have to set the ohmmeter to a par-
ticular scale as the meter displays the ohm
value up to the maximum capability of the
meter.
Install probes and take resistance readings in
the normal manner.

AMMETER AND VOLTMETER

Voltmeter Readings:
Install leads in bottom of Amprobe®. Select the
desired voltage scale. Take readings by touching
one probe to each of the lead line terminals.
Ammeter Readings:
Arrange leads so the jaws of the Amprobe®
will encircle one lead.
Set meter on maximum amp scale and encir-
cle jaws around one lead and take reading. It
may be necessary to reset to a lower scale.
Level 2
25
A.O.Smith