Syyt digitaalinen yleismittari vika ja ennaltaehkäisevä toimenpiteet
1. Useimmissa tapauksissa, vaurio to a digitaalinen yleismittari on aiheutettu mittaus hammaspyörä virheet. Esimerkille, kun mittaus AC teho, jos mittaus hammaspyörä on asetettu to the vastus vaihde, kerran the anturi kontaktit the teho, it voi välittömästi aiheuttaa vahinko the sisäiset komponentit of yleismittarin. Siksi, ennen käyttö a yleismittari mittaamiseen, se on välttämätön tarkistettava tarkistettava onko mittaus vaihde on oikein. Jälkeen käyttö, paikka mittaus valinta at AC 750V tai DC 1000V, niin se ei asia mitä parametri on vahingossa mitattu in seuraava mittaus, se ei aiheuta vahinko digitaalinen yleismittari
2. Some digital multimeters are damaged due to the measured voltage and current exceeding the range If measuring the mains power in the 20V range, it is easy to cause damage to the AC amplifier circuit of the digital multimeter, causing the multimeter to lose its AC measurement function. When measuring DC voltage, if the measured voltage exceeds the measurement range, it can also easily cause circuit faults in the meter. When measuring current, if the actual current value exceeds the range, it usually only causes the fuse in the multimeter to burn out and will not cause any other damage. So when measuring voltage parameters, if you don't know the approximate range of the measured voltage, you should first set the measurement mode to o, measure its value, and then shift gears to obtain a comparative value. If the voltage value to be measured far exceeds the maximum range that the multimeter can measure, a high resistance measuring probe should be provided separately. To detect the anode high voltage and focusing high voltage of black and white color TVs.
3. The upper limit range of most digital multimeters for DC voltage is 1000V, so when measuring DC voltage, the highest voltage value is below 1000V, which generally does not damage the multimeter. If it exceeds 1000V, it is highly likely to cause damage to the multimeter. However, the upper limit of measurable voltage may vary among different digital multimeters. If the measured voltage exceeds the range, the method of resistance voltage reduction can be used for measurement. In addition, when measuring high DC voltages ranging from 40O to 1000V, the probe must be in good contact with the measuring point and there should be no shaking. Otherwise, in addition to causing damage to the multimeter and inaccurate measurements, in severe cases, the multimeter may also have no display.
4. Kun mittaus vastus, olla varovainen ei mitata sähköllä.
