What is a Digital Multimeter (DMM)?
A Digital Multimeter (DMM) is a convenient measuring instrument that allows by itself the measurement of DC voltage, AC voltage, DC current, AC current and resistance (Pocket type DMM normally cannot be used for the measurement of current for safety reasons). In addition to these basic measuring functions, most of our models are provided with features such as a diote test function and continuity buzzer. Some of the recent products feature the measurement of frequency of maximum and minimum value hold and relative value measurement as well as data hold and range hold functions. The advent of DMMs connectable to a PC (PC series) makes it possible to let a PC assume the function of expensive recording meters and recorders.
A DMM is simply an electronic ruler for making electrical measurements. The multimeter combines the functions of a voltmeter, ammeter and ohmmeter. It may have any numbers of special features but mainly a DMM measures volts, ohms and amperes. Important Features to Consider Resolution By knowing the resolution of a DMM you can determine whether the meter could measure down to only 1 volt or down to 1 millivolt (1/1000th of a volt). The resolution refers to how small or fine a measurement the meter can make. You wouldnt buy a ruler marked in one-inch segments if you needed to measure down to 1/4 inch mark. A 3200-count meter will display a tenth of a volt resolution up to 320 volts. This is the same resolution as a more expensive 20,000-count meter until you exceed 320 volts. Accuracy Accuracy is the largest allowable error that will occur under specific operating conditions. This shows how close the DMMs displayed measurement is to the actual value of the signal being measured. An accur
