is the a.c. mains voltage before applications of the test level.
T
EN
64
G G u u i i d d a a n n c c e e a a n n d d m m a a n n u u f f a a c c t t u u r r e e r r ' ' s s d d e e c c l l a a r r a a t t i i o o n n - - e e l l e e c c t t r r o o m m a a g g n n e e t t i i c c i i m m m m u u n n i i t t y y