IEC 62122 pdf download.Methods of measurement for consumer-use digital VTRs – Electronic and mechanical performances 1 Scope and object This standard specifies the basic methods of measurement for evaluating the electronic and mechanical performances of consumer-use digital VTRs. The formats of open reel VTRs, Beta, VHS, and 8 mm VTRs have been standardized. Methods of measurement for these analogue VTRs...