Summary 2---Multimeter measures the voltage of square wave and sine wave

Summary 2--- multimeter measures the voltage of square wave and sine wave

The voltage of the square wave measured by the multimeter is the average and the sine wave is a valid value.

The reason is: the multimeter uses the integral ADC, the results are averaged. ... Why is this, check the time, then continue!!

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Current. The amount of electricity on a section is called the current intensity, or the current, or the directional movement of the charge in the conductor. The free charge in the conductor makes a regular directional movement under the action of the electric Field force, and the current is formed.

The amount of charge through the conductor section Q follows the ratio of the time t used to pass these charges into the current. also known as current intensity. That is i=q/t . If the charge in the cross-section of the conductor is 1Cin 1s , the current in the conductor is 1 a.

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Note: The current is obtained for an area integral, and the measure of the number of carriers flowing through this section is called the current unit time. Therefore, the current to a point of significance, the measurement of the current equivalent to observe this point, the current measurement must be a point of measurement, the current measurement must be the ammeter in series to the circuit used.

The voltage difference between two points is nonzero when the electrical potential changes during the movement of the carrier from one point to the other. So the voltage to two points only makes sense, the measurement of the voltage must be two points of measurement, it must be the voltage meter in parallel in the circuit. The following is only a description of the most used periodic signal.

U-peak Vpp (peak to peak). Peak-to-peak is the value of the difference between the highest and lowest values in a period. Is the range between maximum and minimum. It describes the magnitude of the change in the range of signal values.

U peak Vp. A peak is a value that is the difference between the highest or lowest of a period of a signal and the average value. In general, peaks are meaningful for signals that are symmetrical on top and bottom. As you can see, peaks are worth half the peaks.

U RMS ( root Mean square).  Refers to the sum of squares after a period of the signal, in the root mean, the following formula . The meaning of a valid value: The amount of work done in one cycle is equal to the size of the DC voltage equal to that value.

U average (Average). means the average value of a signal over a period. expressed in formulas as

² The actual use of the waveform coefficient KF, the effective value and the average ratio.

² defines the ratio of the peak to the effective value of a signal as the crest factor

² Note: For a square wave, the smaller the duty ratio, the greater the difference between the RMS and the average, and the effective value is always greater than the average. The ratio of valid values to the mean is often referred to as the waveform coefficients. can refer to this original post http://www.rfcafe.com/references/electrical/sinewave-voltage-conversion.htm

² The table below gives some parameters for common waveforms.

Summary 2---Multimeter measures the voltage of square wave and sine wave