In DC a multimeter will not use RMS circuit, but a averaging circuit.Ī 50% duty cycle waveform from 0V to 10V, this means the average voltage is 5.00V, a RMS meter will show 5.00V (It removes the DC component) and the DC+AC voltage is 7.07V, because it is a square it will contain much higher frequencies than the nominal frequency.Ī 10% duty cycle waveform from 0V to 10V, this means the average voltage is 1.00V, a RMS meter will show 3.00V and DC+AC is voltage 3.16V, because it is a square with a 10% duty cycle the frequencies in this curve will be much higher than above.Ī 90% duty cycle waveform from 0V to 10V, this means the average voltage is 9.00V, a RMS meter will show 3.00V and the DC+AC voltage is 9.49, this will have the same high frequency content as the 10% curve. What current do I use (DC / RMS / DC+AC)?Ĭan a DMM Measuring maximum and minimum voltage/current in PWM What voltage do I use (DC / RMS / DC+AC)? UNI-T UT210E: A cheap clamp meter, I will only use this when looking at current. meters:įluke 289: A very expensive meter with just about everything.īSide ZT301: A cheap meter with all the common function. Multimeter and pulsed DC current (PWM) Multimeter and pulsed DC current (PWM)Ī multimeter usual can measure DC and AC but what happens when measuring a pulsing voltage or current?įor this article I will be using 3.
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