For car enthusiasts, there are combined measuring devices that are specially designed for testing in a car. With the help of such a device, it is possible to measure the rotation speed of the shaft in the car, the angle of the closed state of the contacts of the ignition system breaker and voltage up to 20 V. When measuring resistance, the device is usually limited to a range in kilo-Ohms. In addition to this, measuring devices are used to test electrical and electronic elements of the design. They allow for a wide measurement from small resistances in Ohms up to the mega-Ohm range. It is possible to measure voltages (V) very accurately, which is primarily required for testing electronic elements of the design.
If you only want to check whether voltage (V) is being supplied at all, then a simple test lamp (A) is suitable for this. However, this is only true for electrical circuits that do not have electronic components. However, electronic components are extremely sensitive to excessively high currents. Under certain circumstances, they can fail even when the test lamp is connected.
Attention! When checking electronic components (transistors, diodes and control units), it is necessary to use a high-resistance voltage indicator (V). It works in the same way as a test lamp, but without damaging the electronic elements of the structure, and is suitable for all control operations.
(This publication was borrowed from the website FORDBOOK.RU)