Buying a tester, choose a model with dial indication. Testerwith digital scale in practice, are less comfortable. Do not buy and very compact model, slightly bigger than a matchbox. All labels on the indicator they are small, which is very inconvenient.
To tester quickly locate faulty, they should be able to use it. One of the most common uses of the tester is a continuity test circuit. In that case if it is necessary to check the short wire without the included pressure sources, check the shift knob ranges on the icon of the diode. Then touch the tester probe ends of the wires in the test circuit. If the wire is intact, the meter pointer will deviate to the edge of the scale. Digital tester readings will be close to zero resistance.
To check the voltage, check the device to measure alternating current measuring range should not be below 300 volts. Then safely insert the probe device in the socket – the device will show you the current network voltage.
To measure DC voltage, switch the device to the appropriate mode. Ensure that the range of measurement was below the intended voltage. In case you don't know what could be the voltage, first turn on the device on a large scale, then evaluating the voltage supply little ranges for more accurate measurements.
With a tester you can test many components of electronic equipment. For example, a diode should pass a current in only one direction. The resistance of the resistor should correspond to their nominal value. Transitions of transistors the base-collector and base-emitter must be opened in one direction and closed in another, the transition collector-emitter closed in both directions.
As there are different types of transistors, while checking have on hand the appropriate directory. In some cases, radio can be check Vipava them from the Board. If the readings do not give a clear picture (influenced by other radioactive elements), the item must desoldering. The resistors and diodes enough desoldering one leg.
When checking the capacitors is more convenient to use a galvanometer – one has only to throw the arrows, that is, its rapid movement to the right edge of the scale and back, can judge its health.
If you need to measure voltage on the Board operating the electronic device, the negative lead attach "crocodile" (if equipped) to the "earth" - usually it is the metal frame of the device. If such a frame there, look for "earth" on the edges of the Board. Positive probe measure the voltage at the desired conclusions.