Measurement of each additional voltage ratio on the same divider with the same applied voltage as in 1 1所述的同一测试电压的同一分压器的每一额外电压比。
Measurement of emf of each additional voltage , from the same reference standard , of same nominal value 测量置于同一标准器具中,而标称值相同的每一额外电动势。
Additional voltage measurement at other frequency settings as well as frequency accuracy check may be offered at extra charge 本所亦可提供在其他频率的电压测量服务及频率准确度检查,但须另行收费。