[电] electronic alternating-current voltmeter
diàn zǐ jiāo liú diàn yā biǎo ㄉㄧㄢˋ ㄗˇ ㄐㄧㄠ ㄌㄧㄡˊ ㄉㄧㄢˋ ㄧㄚ ㄅㄧㄠˇ