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1、INTERNATIONAL STANDARD ISO 5347-15 First edition 1993-12-15 Methods for the calibration of Vibration and shock pick-ups - Part 15: Testing od acoustic sensitivity Methodes pour I. - 250Hzto2000Hz: 120dBk5dB; - 4 000 Hz: 115 dB f 6 dB; 3.1 Test procedure Place the loudspeaker in the middle of the roo
2、m with no hard reflecting surfaces in front of it. Suspend the accelerometer in a rubber harness in front of and close to the loudspeaker. The Suspension resonance frequency shall be lower than 20 Hz. Ro- tate the accelerometer in Order to find maximum sensitivity. Replace the accelerometer by a mic
3、rophone and shape the noise spectrum. After the accelerometer has been suspended in its rubber harness and then rotated, measure the maxi- mum output, in metres per second squared, for the specified sound pressure level. If it is suspected that whole accelerometer rigid body vibrations are induced a
4、nd that this affects the accelerometer output, special test procedures, outlined in 3.3, shall be carried out and reported. Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/27/2007 21:09:
5、49 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO 5347-15:1993(E) 3.2 Expression of results The acoustic sensitivity shall be reported as the equivalent accelerometer output, in metres per sec- ond squared, for the applied level Sound pressure (reference value: 2 x 10m
6、5 Pa). 3.3 Special test procedures Acoustic sensitivity measurements of piezoelectric accelerometers tan be difficult to make because whole rigid body vibratoty motion effects tan be in- duced into the accelerometer. If these effects are suspected, the following methods for minimizing mo- tion effec
7、ts shall be applied: a) Mount the accelerometer on a very heavy but small fixture; this generally distorts the acoustic field so the Sound pressure level has to be meas- ured with the microphone in an accelerometer dummy mounted on the fixture. b) Measure the induced motion with an acceler- ometer t
8、hat is protected and mounted inside the fixture and subtract the induced motion compo- nents from the pick-up output. c) Mount the accelerometer on the smallest possible rod fixture clamped to a heavy base and isolate this fixture and the base from the Sound field; a high density material, e.g. tung
9、sten, is rec- ommended. Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/27/2007 21:09:49 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO 5347-15:1993(E) UDC
10、 534.1:681.327.7:53.089.6 Descriptors: Vibration, mechanical shock, transducers, Sensors, tests, calibration Price based on 2 oaaes Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/27/2007 21:09:49 MDTNo reproduction or networking permitted without license from IHS -,-,-