MIL-PRF-23256C
Tolerance levels in terms of dB are defined as:
W1
dB = 10 log
W0
Where W1 is measured acceleration PSD in g2/Hz and
W0 defines the specified level in g2/Hz.
Confirmation of these tolerances shall be made by use of an analysis system providing statistical
accuracy corresponding to a bandwidth-time constant product, BT = 50, minimum. Specific
analyzer characteristics shall be as specified below or equivalent.
a. On-line, contiguous filter, equalization and analysis system having a bandwidth B = 50 Hz
maximum.
b. Swept frequency analysis systems characterized as follows:
(1) Constant bandwidth analyzer.
(a) Filter bandwidth as follows:
B = 20 Hz, maximum between 20 and 200 Hz.
B = 50 Hz, maximum between 200 and 2,000 Hz.
(b) Analyzer averaging time = T = 2RC = 1 second, minimum, where T = true
averaging time and RC = analyzer time constant.
B2
B
(c) Analysis sweep rate (linear) = S =
or
Hz per sec, whichever is smaller.
4RC
8
(2) Constant percentage bandwidth analyzer.
(a) Filter bandwidth = pfc = one third octave minimum (0.23fc) where p = percentage
and fc = analyzer center frequency.
50
, minimum.
(b) Analyzer averaging time T=
Pf C
13
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