Mitä on laskenta tarkkuus (epävarmuus) of a digitaalinen yleismittari?
Answer: Some manufacturers also refer to the accuracy of a multimeter as uncertainty, which generally says "measured within one year after leaving the factory, at an operating temperature of 18 degree ~ 28 degree (64 degree F ~ 82 degree F) and a relative humidity less than 80%" , ± ({{10}}.8% reading + 2 digits)." Many buyers or users are not very clear about this and often ask. I am assuming here that there is an instrument that is in a certain range, such as the DC 200V range, and it is written like this. The measured value displays 100.0 on the instrument, so what is the correct value at this time? I think that for ordinary users, they can completely ignore the accuracy calculation and just think of it as DC 100V. Calculated according to the manufacturer's accuracy, when measuring 100V (displaying 100.0), the error is ±(0.8%*1000+2)=±10, which is an error of 1.0V. When substituting the reading, do not consider the decimal point to display the value. Substitute it into the calculation, add the decimal point to the calculated value, and then use the original reading to calculate the freight. Like this example, the correct value is 100.0±1.0, which should be between 99.0 and 101.0V DC.
Jos I halua oppia sähköinen ylläpito, mitä laji yleismittari pitäisi I ostaa?
Answer: Under normal circumstances, those who are just starting out can just buy a popular multimeter (triple meter, so named because it can measure voltage, current, and resistance at the same time). The most commonly used function is resistance, and then DC voltage. , the additional functions of multimeters, such as diodes, buzzer functions, transistors and capacitance measurements, are also commonly used. You should consider purchasing an instrument with this function. Of course, there are some skilled maintenance personnel who may have their own unique maintenance methods, which is another matter. The most cost-effective multimeter that meets these functions is DT9205A or M890D. This is the standard model. There are some manufacturers called DT9205, DT9205N, DT9205L, DT9205B, and DT9205M. In fact, the functions are almost the same. It can be said that they are changing the soup without changing the medicine. Buyers Just look for the functions and don't worry about the differences in models.
