For car enthusiasts, there are multi-purpose measuring instruments that are designed specifically for measurements in a car. With one such device, it is possible to measure the crankshaft speed, the angle of the closed state of the breaker contacts, and, in addition, voltage up to 20 volts. The measurement range of such a resistance device is limited, as a rule, to the region of kiloohms, that is, 1-1000 kΩ.
In addition, measuring instruments are available for testing electrical and electronic components. They allow you to make extensive measurements from small resistances in ohms (Ω) up to very high resistances in megaohms (MΩ). Voltage (in volts) can be measured very accurately, which is primarily required for electronic parts.
When it is only necessary to check whether there is voltage at all in the target, a simple test lamp -A- is suitable for this. First of all, it is only suitable for monitoring electrical circuits that do not contain any electronic parts. This is due to the fact that electronic components are extremely sensitive to high currents and, under certain circumstances, even when the test lamp is connected, they can fail.
Attention: To control electronic parts (transistors, diodes, capacitors and control units) a voltage indicator with a high internal resistance -B- is required. It works like a test lamp, but does not cause damage to electronic parts and is suitable for all test work.