7.3 Fuses
Note: With the power OFF, always remove a fuse from its
socket before testing it. With cartridge fuses, touch the test
leads to each end of the fuse (see fig. 10). If the fuse is good,
the needle indicator will move to -0- ohms. If not, replace the
fuse. On plug-type fuses, touch the the test leads on the
bottom contact and the other on the threaded metal contact
(see fig. 11). On time-delay/tamper-proof fuses, the other
metal contact is at the top of the ceramic threads.
7.4 Switches
Cut off the power source to the switch. If necessary, remove
the switch. Turn the switch to the ON position and touch the
test leads to the switch terminals (see fig. 12). If the switch is
good, the needle indicator will move to -0- ohms. If not,
replace the switch. On other switches such as three-way
light switches or double pole double throw (ON-OFF-ON)
switches, each ON position will need to be tested. Alternate
the test leads between the switch terminals to determine
which two terminals control that ON position.
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7.1 Extension Cords
Unplug the cord. Set the function/range switch to the Rx1K
position. Touch one of the test leads to one of the metal prong
ends of the cord, and insert the other test lead in either one of
the receptacle slots on the other end of the cord, making sure
the test lead is making good contact with the receptacle (see
fig. 9). If the needle indicator does not move to -0- ohms,
insert the test lead into the other receptacle slot, again making
sure of good contact. If the needle indicator still does not
move the cord has a break and should be replaced.
7.2 Appliance Cords
Unplug the appliance from its power source. Turn its power
switch to the ON position. Touch the test leads to the metal
prong ends of the cord. The meter should indicate a low
resistance value. If not, flex the cord while the leads are still
in contact with the metal prongs. If the needle indicator
moves sporadically while the cord flexes, there may be a
broken conductor in the cord. If the needle indicator does not
move at all, there may be an open circuit in the appliance.
Should it be determined that the cord is not the source of the
problem the appliance may need to be disassembled in
order to pinpoint the problem. Refer to the owners manual of
the appliance. The manufacturer of the appliance may
require that the appliance be serviced only by a qualified
repair technician.
13
Figure 11
Figure 10
Figure 12
Figure 9
