Explanation of multimeter terminology
Standard sine wave (Sinusoidal waveform): A signal that changes sinusoidally without distortion.
True-rms digital multimeter (True-rms): A digital multimeter that can accurately measure the effective values of sine waves and non-sinusoidal waves.
Accuracy: Indicates the difference between the measured value of a digital multimeter and the actual value. Expressed as a percentage of reading or a percentage of full scale.
Current-shunt: A low-value resistor in a digital multimeter used to measure current. A digital multimeter measures the voltage across it and uses Ohm's law to calculate the current value.
Digital multimeter (DMM): Displays the value of the measured signal in digital form. The characteristic of digital meters is that their accuracy, resolution, reliability and other indicators are higher than those of analog meters.
Analogmeter: An instrument that uses an analog pointer to display measured values. The user determines the reading by the position of the pointer during its stroke.
Annunciator: Multimeter is used to indicate that the selected range or function is wrong.
Effective Value (RMS): A measurement of an AC signal that is equivalent to a DC signal.
Average Responding Digital Multimeter (Average Responding): It can accurately measure sine waves, but it is not accurate enough when measuring non-sinusoidal waves.
Word (Count): The last digit of a digital multimeter, often used together with percentages to express the accuracy of a digital multimeter.
Non-sinusoidal waveform: waveforms such as pulse sequence, square wave, triangle wave, sawtooth wave, peak wave, etc.
Resolution: The smallest change that can be observed in a measurement.
