MIL-DTL-52869C
Terminal Board 2
Function
(TB2)
1
receiver input signal
2
receiver input signal return
3
spare
4
spare
5
spare
6
spare
7
synchronization (sync) signal input
8
sync signal return (signal ground)
9
enclosure ground
10
spare
Function
Terminal Board 3
(TB3)
input to notch rejection filter
1
input signal from receiver
2
output to signal processor circuitry
3
notch rejection filter output
4
3.5.2
Functional characteristics.
3.5.2.1 Power. The PUS shall operate from power supplied to the processor
from an external 20 Vdc regulated power supply. Reverse polarity connections
to the processor shall not damage the PUS. A PUS consisting of a processor
and any number of receivers from one to 20 shall operate as specified herein
on regulated voltage between 18 and 22 Vdc with a current drain not exceeding
60 miliamperes (mA).
3.5.2.2 Performance. The PUS shall be sensitive to all ultrasonic energy
within the frequency range of 20 to 30 kilohertz (kHz) that is not rejected by
the notch (band-reject) filter incorporated in the processor and that is more
than 50 decibels (dB) above the reference sound pressure level (RSPL) of
0.0002 microbars at the receiver microphone. The PUS shall perform as
specified in 3.5.2.2.1 through 3.5.2.2.4 under the following conditions,
except as specified:
a.
ultrasonic frequency: 20 to 30 kHz.
b.
ultrasonic energy level at receiver microphone: 60 dB above the
RSPL.
c.
processor sensitivity control: set at maximum.
d.
receiver gain control: set at mid-range.
e.
number of receivers: any number from one to 20.
f.
cable between processor and each receiver: up to 500 feet of cable,
RG 58/U or equivalent.
g.
band-reject filter: bypassed, except in the case of 3.5.2.2.4.
3.5.2.2.1 Alarm criteria. The PUS shall be in the alarm state after
receipt of four energy impulses having a minimum width of 40 milliseconds (ms)
within a 15 second period, or receipt of more than 4.5 seconds of continuous
ultrasonic energy. Any two or more consecutive impulses occurring within less
than 1.5 seconds shall be processed as a single impulse.
3.5.2.2.2 Bandpass characteristics. With the processor sensitivity
control set to position 3 and an ultrasonic source set so as to produce a 25.5
kHz signal at an amplitude of 0.5 volts root-mean-square (Vrms) at test point
2 (TP2) in the processor, the response at TP2 shall not differ by more than 4
dB above or 8 dB below the average in-band response over the frequency range
from 20 to 30 kHz.
5
For Parts Inquires call Parts Hangar, Inc (727) 493-0744
© Copyright 2015 Integrated Publishing, Inc.
A Service Disabled Veteran Owned Small Business