Why the $3 Voltmeter Cannot Work With Inline Resistance...

[Bret Cahill]

The lowest voltage it can measure is what powers the LED display so something must be acting like a DC to DC converter set at the display voltage.

Additional resistance in series lowers the current too much to power the display.

It only works on an ideal voltage source.

 

[amdx]

On 4/17/2022 8:10 AM, Bret Cahill wrote:

The lowest voltage it can measure is what powers the LED display so something must be acting like a DC to DC converter set at the display voltage.

Additional resistance in series lowers the current too much to power the display.

It only works on an ideal voltage source.

What Brand and model is this meter?
            Mikek

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