Downloaded from https://www.everyspec.com MIL-STD-81OD 19 July ,1,983 b. swept frequency analysis syst.ema characterized as fOllows: (1) Constant bandwidth’ as follows: (a) Filter bandwidth as follows: B . 25 Hz, maximum between 20 and 200 Hz B . 50 Hz, maximum between 200 and ,1,OQO Hz B = 100’Hz, aximum between 1,000 and 2,000 Hz -. (b) Analyzer averaging time = T = 2 RC 1 second, inimum, where T . True averaging time and RC . analyzer time constant. (c) Analyaia sweep rate (linear) . R ~ or 4RC maximum, whichever ia smaller. B2 (Hz/~e~ond) (2) Constant percentage bandwidth analyzer.
(a)’ Filter bandwidth z pfc = one-tenth of center frequency maximum (O.I’fc),where p = percentage , and fc . analyzer center frequency. (b) Analyzer averaging time = T . M minimum pfc (c) Analysis aweep rate (logarithmic) = R = ~ . 4Ht or (Pf~)z(Hz/second’)maximum, whichever ii smaller. 8 II-2 PREPARATION FOR TEST 11-2.1 Step 1. Perform life cycle analysis described in’section 4 of this standard. Step 2. Identify test categories which are applicable and pertinent from the life cycle analysis. . Step 3 . Determine test conditions for each applicable and pertinent category. Step U. Select appropriate test apparatus, data collection and analysia equipment. METHOD 514.3 19 July 1983 514.3-71