Fss-9\(V\)This specification covers a receiver and a processor which combine to form a passive ultrasonic sensor, designed to detect the sounds of forced entry into a protected space.

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MIL-DTL-52869C

APPENDIX A

TEST METHOD 1

POWER TEST

TEST APPARATUS:

a. Power supply, dc - constant voltage, adjustable from 18 to 23 Vdc,

100 mA minimum current capacity, line and load regulation 0.5 percent or less,

ripple and noise 5 mV P-P.

b. Ammeter, dc - 100 mA minimum, resolution 0.1 mA, accuracy 3 percent,

maximum voltage burden 0.3 Vdc.

c. Voltmeter, digital, dc (2 required) - 3 1/2 digit or greater, 10 mV

resolution, accuracy �(0.7 percent of reading � 1 least significant digit

[LSD]).

TEST PROCEDURE:

a. Connect 20 receivers to TB2 of the processor by connecting TB1-1 and

TB1-2 of each receiver to TB2-1 and TB2-2 respectively of the processor.

b. Place the PUS in operation by applying 20 �0.3 Vdc through the

ammeter to terminals TB1-7 (positive) and TB1-8 of the processor. The current

shall not exceed 60 mA.

c. Reverse the polarity on terminals TB1-7 and TB1-8 for 10 seconds.

The current shall not exceed 1 mA.

Reconnect as in step b.

The current shall not exceed 60 mA.

e. Measure the voltage between test point 5 (TP5) (positive) and TB1-8

(common) with a voltmeter. The voltage shall be 12 �0.6 Vdc.

f. Vary the voltage across TB1-7 and TB1-8 from 18 to 22 V.

The voltage

at TP5 (12 �0.6 Vdc) shall not vary more than �100 mV.