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CHAPTER 3 ORGANIZATIONAL MAINTENANCE INSTRUCTIONS - TM-5-6350-262-14-80017
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TM-5-6350-262-14-8 Switch Balanced Magnetic SA-1955( ) / FSS-9 (V) NSN
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Figure 4-1. Operational schematics, balanced magnetic switch.
TM 5-6350-262-14/8
NAVELEX 0967-LP466-9081
TO 31S9-4-31-1 Chg 1
CHAPTER 4
FUNCTIONING OF EQUIPMENT
4-1. Mechanical Functions
assembly. The contacts of this switch are held closed
by a projection on the cover of the assembly.
a. The balanced magnet switch operates on the
Whenever the cover is removed, the switch contacts are
principle that if opposing magnetic fields imposed on a
opened (tamper condition).
reed switch are cancelled, the switch will remain
unactuated.  Likewise, if the magnetic fields become
unbalanced, the reed switch will actuate. The system of
4-2. Electrical Functions
magnets of the balanced magnetic switch consists of the
a. The operational schematics of the switch
two magnets (16, fig. C-1) in the magnet assembly and
assembly are shown in figure 4-1. Figure 4-1A shows
the bias magnet assembly (9, fig. C-1) in the switch
the circuit condition of the balanced magnetic switch
assembly. Without the presence of the biasing magnet
whenever magnetic switch S2 is unactuated.  In this
in the switch assembly, the reed switch (S2 in figure 2-2)
condition, TB1-1 and-2 is a closed circuit with a
would always be actuated whenever this assembly was
resistance of 50 ohms, and TBL-1 and-7 is an open
near the magnet assembly.  However, the biasing
circuit. This condition is interpreted by the J-SIIDS as a
magnet is capable of balancing out the effects of the
secure condition.
magnet assembly when properly adjusted, to allow the
b. Figure 4-1B shows the configuration of the
reed switch to remain unactuated even when in close
balanced magnetic switch whenever magnetic switch S2
proximity to the magnet assembly.
is actuated. In this condition, TBL-1 and -2 is an open
b. The system of magnets is designed such that
circuit and TB1-2 and -7 is a closed circuit with a
whenever the magnet assembly is moved a specified
resistance less than 50 ohms.
This condition is
distance away from the switch assembly, the field of the
interpreted by J-SIIDS as an alarm condition.
biasing magnet is no longer balanced out by the magnet
c. Figure 4-1C shows the configuration of the
assembly and the biasing magnet causes the reed
balanced magnetic switch whenever the cover has been
switch to actuate. The balanced condition can also be
removed.  In this condition TB1-5 and -6 is an open
upset if another foreign magnet is brought into proximity
circuit.  This condition is interpreted by J-SIIDS as a
with the switch assembly.
tamper condition.
c. A microswitch (S1 in fig. 2-2) is also provided to
detect the removal of the cover of the magnetic switch
4-1

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