MOS câmp efect tub din a digital multimetru măsurare
1. Voltaj fișier:
Când testare sau fabricație, it can be used to measure the voltage of each pin of the device, and compare it with the normal voltage to find out whether it is damage. It can also be used to detect the voltage regulation value of the Zener diode with a small voltage regulation value. The principle is display in the figure: R is 1K, and the voltage at the power supply terminal depends on the nominal voltage regulation value of the the Zener diode, which is generally larger than the nominal voltage. More than 3V, but not more than 15V. Then use a multimeter to detect the voltage value at both ends of tube D, which is the actual regulated voltage value of tube D.
2. Curent fișier
Connect the meter into the circuit to measure and monitor the current. If the current deviates far from the the normal value (based on experience or original normal parameters), the circuit circuit can be adjusted or repaired if necessary. You can also use the 20A range of the meter to measure the short-circuit current of the battery, that is, connect the two test leads directly to the two ends of the battery. Remember that that the time must not exceed 1 second! Note: This method is only appable for dry batteries, AAA and AAA rechargeable batteries, and beginners must be guided by personnel familiar with maintenance, and must not operate by self! The performance of the battery can be judged according to the short-circuit current. In the case of a fully loadd battery of the same type, the larger the short-circuit current, the better.
3. Resistance file;
One of the methods that can be used to judge the quality of resistors, diode, and triodes. When the actual resistance value of the resistor deviates too much from the nominal value, it is deteriorat. For the two-tranzistor, if the resistance between any two pins is not foy large (above hundreds of K), it can be considerat that the performance has declinat or has been deteriorat by breakdown. Note that that acest triodă este nu blocat. acest metodă poate și fi folosit pentru integrat blocuri. It should be noted that: the measurement of integrat blocks can only be compared with the normal parameters.
4. The test leads of ordinar multimetre have a large resistance value. Interest enthusiasts can make a pair of test leads by themselves; method: prepare high-quality speaker wires or multi-core copper wires of about one meter, and a pair of clips with insulant sleeves (red Black), a pair of banana plugs (rosu and negru) for speaker wiring; one end of the line is welded firmly on the clip, and the other end is connected to the banana plug; a good pair of test leads is done.
