Voltage testers

When repairing the car, electrical tester screwdriver helps to safely check serviceability of the vehicle electrical system, find the positive wire or a spot of an open-circuit failure, check battery polarity. If the current is detected, the device gives a light or sound-and-light signal.

Types of electrical tester screwdrivers

By operating principle:

• Non-contact tool. For a tool of this type, it is sufficient to place it in such a manner that its working part be near the tested element of the circuit. These devices can detect voltage through the layer of insulation or even plaster, which allows to find hidden wiring and to test electrical equipment without disassembling it.
• Combined. Such electrical tester screwdrivers have the rod for contact check and the working element for non-contact testing.

By indication type:

• with light indication:
  • with neon lamp;
  • with LED;
• with sound signal;
• with the display.

Also, devices differ in their functionality. Some of them are suitable for performing many tasks - from detecting the phase conductor to measuring voltage and searching hidden wiring; others can, for example, only detect the presence of current in the mains. There are also special devices intended for certain types of works. So, the testers designed for checking car electric wiring have a wire on the backside of the handle, with an alligator clip at the end of this wire; it should be connected to the negative terminal during testing.

It is important to remember that devices in manufacturers’ catalogues differ by the level of the voltage to be detected. For example, many devices don’t actuate if it is below 60V or break down if it exceeds 250V. That is why when selecting the tool it is important to take into account the parameters of the electrical system you are going to work with.

Tips on electrical tester screwdrivers use

1. For detecting the phase conductor you should clean up the tested contacts and diverge them in order to avoid short circuit. If the device didn’t give a signal at the moment of contacting one of the elements, the second one should be checked anyway.
2. It is not recommended to use the device for mounting and demounting fastening elements: its rod is not designed for such loads.
3. If the tool has independent power supply, there’s possibility of errors in the readings in case of its partial discharging.

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