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Reading the max voltage of a low duty cycle PWM? Answered

How do I measure the maximum voltage reached by a very low duty cycle PWM signal without having to alter the signal. The multimeter shows no reading or gives a very brief wrong reading and falls back to zero. I don't have an oscilloscope. Are there any other alternative set-ups to measure just the voltage in this case. Please suggest.

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seandogue

4 years ago

peak detector.

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steveastrouk

4 years ago

Use a diode, and pump it onto a capacitor. Measure the capacitor voltage after a few cycles, deduct 0.7V

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mpilchfamily

4 years ago

Get a better meter that can hold on the lowest or highest voltage measured.

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iceng

4 years ago

The max voltage is the source voltage minus one transistor forward drop.

If you are using a fet then subtract 0.3V

If you are using a Bipolar then subtract 0.6V

If you are using a darlington then subtract 1.3V