Multimeter

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How does a multimeter measure voltage?

Measures voltage by scaling it down to a safe value, read by an ADC, and then multiplied back to the original value

  • High internal impedance (nom. 10MΩ) prevents circuit loading

  • The ADC draws minimal current (pA) to prevent circuit loading

  • Changing voltage range = Changing voltage divider into ADC


<p>Measures voltage by scaling it down to a safe value, read by an ADC, and then multiplied back to the original value</p><ul><li><p>High internal impedance (nom. 10MΩ) prevents circuit loading</p></li><li><p>The ADC draws minimal current (pA) to prevent circuit loading</p></li><li><p>Changing voltage range = Changing voltage divider into ADC</p></li></ul><p></p>
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