- Control materials: the tension tester screwdriver
- Electrical continuity tester.
- The universal controller (ammeter and voltmeter)
- Control methods: use the voltage tester
- Use the continuity tester
- Use the universal controller
Before any intervention on a broken electrical appliance or a circuit that seems to be faulty, it is advisable to carry out some simple checks, in order to avoid unpleasant mistakes and to locate more precisely the origin of the possible defect.
Caution: Some devices, such as the battery-powered continuity tester, should not be used on a live installation!
Control materials: the tension tester screwdriver
This is, in practice, the most commonly used device. It only serves, of course, detect a break without providing further information as to the nature of the failure. It contains a small light bulb that comes on when the blade comes into contact with a live conductor.
Electrical continuity tester.
A flashlight housing, or a device inspired by the drawing opposite, test the electrical continuity of a circuit or device.
Simply connect the base of the lamp to a conductor with a banana plug or crocodile clip, and make the same connection to the second pad of the battery.
The circuit or the apparatus, having been of course previously de-energized (ie disconnected), can thus be tested. The lamp bulb should illuminate when the plugs of the improvised continuity tester come in contact with each conductor in the circuit or appliance.
The universal controller (ammeter and voltmeter)
It is of a much more versatile use since provides quantified information about the electrical current: voltage, power, but also intensity, resistanceetc. It is particularly essential for balance the phases of a three-phase installation. Formerly, professional device, the universal controller is now available in very affordable versions.
Control methods: use the voltage tester
1. With the Voltage Tester, the small light bulb contained in the handle will illuminate when its metal rod touches an element receiving the phase (referred to as a "hot" point). Safety caps on recent plugs make it difficult to control the power supply of these plugs.
Use the continuity tester
2. The continuity tester, commonly called "bell" by professionals, is used to ensure electrical continuity between two normally connected points, so to detect a break in a circuit. This device, which can be made by any handyman, is also very useful for take a diagram of a circuit.
Use the universal controller
3. The universal controller is the electrician's handyman average for all low and very low voltage applications. It makes it possible to raise the fundamental values of any apparatus or circuit: tension, intensity, resistance (or impedance).
In voltmeter function for example, the device allows to control the supply voltage of the terminals of a socket.
(photos / visuals: © DIY-Prod, except special mention)
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