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Nuisance Alarms - TM-5-6350-262-14-20020
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TM-5-6350-262-14-2 Processor Passive Signal Ultrasonic MX-9443( )/FSS-9(V) FSN 6350-228-2548 Receiver Passive Signal Ultrasonic Manual
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Operation Under Emergency Conditions
CHAPTER 3
OPERATING  INSTRUCTIONS
Section I. CONTROLS
3-1. General
ment to compensate for changes in environment in
the protected area or during the periods of mainte-
The processor/receiver ultrasonic passive signal
nance.
consists of one processor and from one to twenty
b. Receiver. Each receiver has a GAIN control
receivers. The processor, when operating, is a closed
(R7) (fig. 1-1) which sets the receiver gain level for
unit and contains one SENSITIVITY control that is
preset during the checkout procedures. The re- c.
optimum detection performance. This control is used
only during installation adjustment to compensate
ceiver, when operating, is a closed unit and contains
for changes in environment in the protected area or
a GAIN control that is preset during the checkout
during periods of maintenance.
procedures. There are no operator/crew controls
associated with this equipment.
Table 3-1. Controls
Control
Function
3-2. Controls
SENSITIVITY R62
Sets the processor sensitivity
a.  Processor. The processor has a SENSITIVITY
level.
Dial is indexed from 1 to 5.
control (R62) (fig. 1-1) which sets the sensitivity level
Note: Each dial number
of the output from the three broadband amplifier
represents a 6 db change.
stages. This control facilitates sensitivity adjust-
GAIN R7
Sets the receiver gain.
ment of the processor to compensate for the number
Dial is indexed from 1 to 10.
of receivers in the processor/receiver ultrasonic
Note: Gain is down 10 db
when going from 10 to 7 on the
passive signal and the extreme range coverage
dial.
which may be encountered between the receivers.
This control is used only during installation adjust-
Section II. OPERATION UNDER USUAL CONDITIONS
3-3. General
a. Starting Procedure. Control of the
processor/receiver ultrasonic passive signal is by
The usual conditions of operation are during the
means of the J-SIIDS control unit. Refer to TM
absence of normal authorized personnel and the
5-6350-262-14/14.
potential presence of unauthorized personnel in the
b. Initial Adjustments. Initial adjustment of
surveillance area.
SENSITIVITY control R62 (fig. 1-1) (processor) and
3-4. Operation
GAIN control R7 (fig. 1-1) (receiver) was performed
following the installation in Chapter 2. No further
Once the processor and the receivers have been
adjustments are required.
installed and checked out (Chapter 2) the only
c. Operating Procedure. Refer to TM 5-6350-262-
remaining procedure of operation is to establish the
14/14 for operating procedures.
operating time periods for the equipment.
OPERATION UNDER UNUSUAL CONDITIONS
Section Ill.
3-5. Unusual Operating Conditions
for any reason a SYNC pulse is not provided to the
a. Unusual conditions of operation may occur
processor/receiver ultrasonic passive signal, nui
when changes take place in the protected area.
ance alarming will occur. The band rejection filter in
Relocation of metal files, cabinets or partitions may
the processor must be bypassed by use of appropriate
result in changes in the surveillance pattern area.
jumpers on TB3. When the processor/transceiver
Installation of new machinery, intercommunication
ultrasonic motion signal is returned to service, a
devices or faulty operation of existing machinery
SYNC pulse must be provided to the
could result in nuisance alarms.
processor/receiver ultrasonic passive signal and the
b. When a malfunction occurs in the
band rejection filter reinserted in the circuitry.
processor/transceiver ultrasonic motion signal, and
3-1

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