| 摘要 |
<p>A single-pole voltage tester comprises an electrically conductive test prod (1) adapted to be connected, via one or more high-ohmic resistors (2) built into a non-conductive or insulating casing (7), to the operator's body, preferably his hand, thereby to provide, upon connection of the test prod to an assumed live point, a connection to the operator's capacitance and thus a current through the resistors which is directly or indirectly utilised for activating an indicator (5), the connection between the operator (8) and the test prod (1) - upon voltage testing - being established exclusively non-galvanically, capacitatively and/or inductively through the insulating casing (7) of the tester. In order to make self-checking as well as ohmic testing of optional test pieces possible, the tester is provided with a reference contact member (12), such as a metal pin which is connected to the test prod (1) via an amplifier (3, 3 min ) of such polarity that current passes through the resistors (2), and the indicator (5) is activated upon galvanic contact between the test prod (1) and the reference contact member (12).</p> |
