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Figure 2-3. Method of Installing Series Capacitor for Reduced Sensitivity
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TM-5-6350-262-14-13 Sensor Capacitance Proximity DT-548( )/FSS-9 (V) FSN 6350-228-2606 Manual
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CHAPTER 3 OPERATING INSTRUCTIONS - TM-5-6350-262-14-130013
Section III. PRELIMINARY CHECK OF EQUIPMENT
NOTE
A good sensor cable (as determined by an ohmmeter check, if
necessary) properly terminated must be connected to the CPS
before the following equipment check can be made.
2-10. Preliminary Steps
a. Request the Control Unit operator to apply power to the CPS and notify him that tests are being conducted.
Make sure that personnel are clear of the equipment protected by the CPS.
b. Using a screwdriver, open the front cover. A tamper alarm should be received immediately at the Control Unit.
c. Disconnect the alarm wires from terminals 1, 2, 5, and 6 of TB1. Continuous capacitance proximity and tamper
alarms should be received at the Control Unit until the connections are restored.
2-11. Capacitance Proximity Alarm Check
a. Connect an ohmmeter (X100 scale) between terminals 1 and 2 of TB1. Ohmmeter should indicate less than
2,000 ohms (no alarm). If ohmmeter reading is not correct, remove and replace circuit card.
NOTE
Ohmmeter may show initially a high resistance (alarm) due to
the technician (operator) having been in proximity to sensitive
components while connecting the ohmmeter. If so, move away
from the protected enclosure; low resistance (less than 2, 000
ohms) should be indicated after approximately five seconds.
b. Approach one of the items of protected equipment, and test for acceptable sensitivity.  Ohmmeter should
indicate greater than 100K ohms (alarm). If ohmmeter reading is not correct, remove and replace circuit card.
c. Have the person step away from the protected equipment. After approximately five seconds, ohmmeter should
indicate less than 2,000 ohms (cessation of alarm). If ohmmeter reading is not correct, remove and replace circuit card.
d. Repeat steps b. and c. for each of the other items of protected equipment. If ohmmeter reading is not correct,
remove and replace circuit card.
2-12. Tamper Alarm Check
a. Connect an ohmmeter between terminals 5 and 6 of TB1. Ohmmeter should indicate greater than 100K ohms
(alarm). If ohmmeter reading is not correct, remove and replace circuit card.
b. Place the plunger of the tamper switch in the maintenance position (fully out). Ohmmeter should indicate less
than 2, 000 ohms (cessation of alarm). If ohmmeter reading is not correct, remove and replace circuit card.
2-13. Short Detection
Connect a jumper wire to terminal 2 of TB2. Touch the other end of the jumper wire to terminal 1 of TB2. Ohmmeter
should indicate greater than 100K ohms (alarm). If ohmmeter reading is not correct, remove and replace circuit card.
Remove the jumper wire from terminal 1 of TB2. Ohmmeter should return to less than 200 ohms (cessation of alarm).
2-14. Open Circuit Detection
Disconnect the outer conductor of the sensor cable from terminal 2 of TB2. Ohmmeter should indicate greater than 100K
ohm (alarm} If ohmmeter reading is not correct, remove and replace circuit card. Momentarily touch the outer conductor
of the sensor cable to terminal 2 of TB2. Ohmmeter should indicate less than 2,000 ohms (cessation of alarm} If
ohmmeter reading is not correct, remove and replace circuit card.
2-15. Button Up
After completing the operational check, restore the alarm wire connections to terminals 1, 2, 5, and 6 of TB1 and the
sensor cable connection to terminal 2 of TB2. Close and latch the CPS enclosure and notify the central Control Unit
operator that the CPS is operational.
2-16. Failure Checks
If any portion of the operational check fails, recheck the installation using the instructions in Section II of this chapter as a
guide. Especially check the soundness of the connections of the sensor cable to the equipment, the installation of the
470K ohm cable terminating resistor, the insulation of the outer cable braid, and the insulation of the equipment from
ground. If it is determined that the installation is correct, refer to Chapter 7 for corrective maintenance.
2-5

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