DWCS1700

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© Winson, 2021/5/31

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Measured Current Data Output:

In order to calculate true RMS of AC current, you need to know

“zero”

value of AC current first. The

“zero” value of symmetric AC current is the

average value Vo(dc) of the current shown in Figure 1.

Figure 1 The zero current value of sine waveform

But in asymmetrical AC current, the

“zero” value is not the average value

Vo(dc) of the current. Based on this

“zero” value and do RMS calculation. You

will get wrong answer.

Figure 2 The zero current value of the asymmetric waveform (Error)

The DWCS1700 offers a true RMS solution for both symmetric and

asymmetric AC current. It can correctly detect

“zero” current value, shown in

Figure 3. and do perfect RMS calculation.

Figure 3 The zero current value of the asymmetric waveform (Correct)