IEC_62459-2010_cor1-2015.pdf

IEC 62459:2010/COR1:2015 1 IEC 2015 INTERNATIONAL ELECTROTECHNICAL COMMISSION _ IEC 62459 Edition 1.0 2010-01 Sound system equipment Electroacoustical transducers Measurement of suspension parts C O R R I G E N D U M 1 3.11 lowest cone resonance frequency Replace the existing Formula(7)by the following new Formula:soff0)21mxf(7)6.3 Incremental dynamic measurement Replace the existing first sentence by the following:This technique for measuring the incremental stiffness Kinc(xdc)according to Equation(3)uses a superposition of a d.c.signal of certain magnitude(for example,constant restoring force Fdc generating a d.c.position xdc)and a small a.c.signal(e.g.restoring force Fac)as stimulus and measures the a.c.response of the suspension part(e.g.the a.c.part of the displacement xac)under steady-state condition.6.4 Full dynamic measurement Replace the existing paragraph by the following:This technique for measuring the dynamic stiffness K(xac)uses an a.c.signal of certain magnitude(for example,the a.c.restoring force Fac)and measures the a.c.response of the suspension part(for example,a displacement xac).9.1 Characteristic to be specified Replace,in the second sentence of this paragraph,Equation(6)by Equation(1).IEC 62459:2010-01/COR1:2015-11(en)