说明：  烙铁头阻抗的测试方法，测试标准，及设备准备和量测技术
(This test method describes the measurement of the DC tip-to-ground resistance of an electric hand soldering/ desoldering tool designed with a grounded tip. Measurement of tip-to-ground AC reactance is outside the scope of this test method. Also, measurement of soft grounded or equipment with insulated tips is outside the scope of this test method)