IEC/TR 61156-1-2:2009+A1:2014 is a revision of the symmetrical pair/quad electrical transmission characteristics present in IEC 61156-1:2002 (Edition 2) and not carried into IEC 61156-1:2007 (Edition 3). This technical report includes the following topics from IEC 61156-1:2002
- the characteristic impedance test methods and function fitting procedures of 3.3.6,
- Annex A covering basic transmission line equations and test methods,
- Annex B covering the open/short-circuit method,
- Annex C covering unbalance attenuation. THIS CONSOLIDATED VERSION CONSISTS OF THE FIRST EDITION (2009) AND ITS AMENDMENT 1 (2014). THEREFORE, NO NEED TO ORDER AMENDMENT IN ADDITION TO THIS PUBLICATION.