Advertisement
TESTING DC POWERED DEVICES WITH THE
HIGH/LOW SENSITIVITY RING INSTALLED !
!
When using the high/low sensitivity ring, the
"Mag-probe" becomes sensitive to north and
south poles. White dot toward the "Mag-
Probe's" tip detects North. When the ring is
removed and installed with the white dot on
the ring towards the "Mag-Probe's" LED,
you'll detect only south poles. !
!
DC powered devices can be connected to a
power source two ways.!
(See figure 6A and 6B) !
!
In figure 6A, assume that a north pole occurs
at the coils upper end when a DC voltage is
applied as shown. If the polarity of the
applied voltage is reversed as shown in
figure 6B, A South Pole is generated at the
upper end. Try both ends of an operating
solenoid, relay, reed relay, or DC device.
Once you establish which end of the relay or
DC device causes the "Mag-Probe" to
operate, the other relays or DC devices
installed in the instrument under test should
respond at the same end. (See figure 7)!
!
!
!
!
!
!
!
!
Page. 7 !
!
!
!
As shown in figure 8, reed relays are DC
powered, you must follow the instructions for
testing DC powered devices.!
!
If a reed relay is mounted in such a way that
you are unable to reach the normally tested
end, reverse the high/low sensitivity ring and
test the accessible end "opposite".!
(see fig. 8) !
!
Advertisement
