MIL-PRF-25439C
4.5.10.2 The transmitter shall be electrically connected to a master voltmeter. The
resonant frequency of the transmitter shall be determined by varying the frequency of applied
vibration slowly through the range of frequencies and vibratory acceleration specified. The
resonant frequency shall be determined by observing the output signal on the master voltmeter.
The output signal vibration variation error and oscillation error shall be noted during the
scanning of the frequency range for the resonant frequency. These vibration errors shall not
exceed the tolerance specified in Table II.
4.5.10.3 The test specimen shall be vibrated at the indicated resonant condition for 1
hour (time specified refers to one axis of the vibration). During this period, the applied double
amplitude or vibratory acceleration shall be as specified in 4.5.11.1. The periods of vibration
shall be accomplished in sequence for each three mutually perpendicular axes vibration applied
along any one axis. Each test period shall be conducted at the most severe resonance frequency.
4.5.10.4 When resonant frequencies are not apparent within the specified frequency
range , the transmitter shall be vibrated twice as long as specified for resonance at a frequency of
3,000 cpm. At the end of this test, the transmitter shall be inspected to determine that no damage
or defects have resulted due to this test. The transmitter shall then be subjected to the vibration
cycling test specified in 4.5.11.
4.5.11 Vibration cycling. The transmitter shall be mounted and connected as specified in
4.5.10.1 and 4.5.10.2 and vibrated with the frequency cycling between 600 and 6,000 cpm in 15
minute cycles as the applied amplitude specified in 4.5.11.1. The vibration cycling shall be
conducted for a period of 1 hour in each of the 3 mutually perpendicular axes. After the vibration
test, a scale error test shall be conducted and the readings established shall not exceed the room
temperature tolerances specified in Table I. The test specimen shall then be thoroughly
examined, and there shall be no damage as a result of this test.
4.5.11.1 Vibration conditions during cycling shall be in accordance with the following:
Frequency (cpm)
Amplitude
300 - 600
0.050 inch
600 - 4,500
0.036 inch
4,500 - 30,000
�10 g
30,000 - 60,000
�5 g
4.5.12 Voltage and frequency variation effect. The applied voltage for this test shall be
set at the following points:
a. 22 � V DC
c. 24 V DC
110 V AC
120 V AC
380 Hertz
380 Hertz
b. 24 V DC
d. 30 V DC
110 V AC
120 V AC
420 Hertz
420 Hertz
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