Updated on 19 October, 2021
A tester is a simple but essential piece of electrical testing equipment which performs a variety of functions when it is used properly. It is an electrically operated device with a glass ampoule and an adjustable electrode. The purpose of a tester is to create a definite voltage across a load, so that measurements can be taken at specific points along the load. A tester will also typically have a control panel for setting testing parameters.
It is extremely important to be familiar with all of the different types of tester available. These include a bench top, fixed, variable, and direct testing range. A bench top tester is used for a vast array of different testing applications including testing various electrical components, fuse holders, switch contacts, relay contacts and solenoids. If you are a newcomer to the world of testing electric components then the best option for you will be the fixed tester. As the name suggests this type of tester has an internal fixed bulb which is constantly illuminated so that the tester can be used without any visual overhead. The main advantage of the fixed variety is that it allows the user to set the exact testing range within which the bulb will emit light.
A similar type of tester to use is the kent-moore tester. The test light bulb within the unit is a standard tester and as the name implies uses the same bulbs that are used in circuit testers. Most kent-moore products are well known and are known to produce some excellent results. The biggest advantage is that they are very economical to purchase and can be used on a number of different types of circuits. Many kent-moore products are used in conjunction with a series resist meter which enables complete readings to be obtained.
There are two types of 12 volt power supplies available. The first is the closed circuit system and the second is the open circuit system. The open system is often installed in consumer units but it is possible to install one of the closed circuit systems in many industrial applications. As with the use of a kent-moore tester the most important factor to consider when purchasing a 12 volt test light bulb is whether or not the fuse panel will actually accept the voltage being supplied.
Fuses are available in a variety of different materials. Often copper tube is used in consumer units to provide protection against shorts. Plastic tubing is also an option although it is often found that these wires are too short to actually use in most applications. It may also be necessary to have protective insulation installed around the fuse panel in order to avoid any damage being caused to the wires. Once the fuse has been mounted, the wires are connected and the test light is switched on.
In order to locate the problem with electrical circuits, the inspector will check all the connections between wires and fuse holders. This is normally done with a continuity tester which is used in testing the continuity of a wiring path. As a rule of thumb, if there is a connection failure, the problem is with the wire or fuse intended to supply power to the automotive device. If the tester reveals a short, the faulty outlet must be identified and replaced. If the tester reveals no short, the problem may well lie with the connection between the defective sockets.
Another common problem associated with some of the most common consumer products is that the lights will either switch off completely or fail to turn on at all. It can often be difficult for an inexperienced user to identify this condition as a simple fuse has blown. In order to diagnose what is wrong the user should first turn on the ignition and then hold the control knob so that he/she can see a light underneath the dash. If the switch appears to be operational, then the problem is with the test light bulbs.
Some of the LED lights used in cars are known to have a tolerance limit. For example, the 6000k LED bulbs should always stand behind another vehicle, which can prevent them from being blown when they fail. For this reason, many purchasers choose to purchase universal LED bulbs for use in other makes and models. Always stand behind your product when it comes to replacing the lights in your car!