特点 Characteristics:
◆ 测量参数及范围：开启电压：0.1~ 9.9V；内阻：0.1~ 9.9Ω；跨导：0.30~5.00S；耐压：50~650V
    Test parameters and ranges: threshold voltage UGS(th): 0.1~9.9V; internal resistance RDS: 0.1~ 9.9Ω;
    transconductance gm: 0.30~5.00S; withstand voltage U(BR)DS: 50~650V
◆ 合格判据自由设置，掉电自动保存，超限自动声光报警
    Freely setting limit of qualification judgement, automatically saving in case of  any power cut, and
    alarming when measured value exceeds limit