Test unit for detecting resistance and voltage presence or drop e.g. for vehicle - has connectors for coupling leads to positive and negative terminals of battery, manually-operated switch for controlling supply of current, and protection switch against cable burning due to short-circuit

摘要

Two leads (3a, 3b) are connected to the positive pole and the other to the negative pole of a DC source. A switch (7) is provided supplying the probe (18) with current of differing polarity or with no current. A protective switch (11) prevents cable burn out with short circuit. The two leads (3a, 3b) at their ends remote from the test unit are provided respectively with terminal tongs (4a, 4b). USE/ADVANTAGE - Test passage of current and polarity. Test unit can additionally carry out functionability and voltage drop testing. No problem occurs with closing of current circuit.