Hello everyone.
I am new to powering and I am facing something I can't understand it, however, I bought a multimeter called DT-830B to measure the voltage of my components, the below measurements seems to be weird to me
3.7v battery when measuring it the multimeter display 4.8V
AC-to-DC adapter output 12v when measuring it the multimeter display up to 15V
Measure a brand new "1.5 V" alkaline battery. I usually get between 1.56 and 1.58V on several meters.
However, Wikipedia says:
The effective zero-load voltage of a non discharged alkaline battery, however, varies from 1.50 to 1.65 V, depending on the purity of the manganese dioxide used and the contents of zinc oxide in the electrolyte.
It sounds like your meter is not accurate. If the 3.7V battery is a Lipo then it would probably have exploded before it actually got to 4.8V. You should never see more than 4.2V om a Lipo. As jremington says the best thing to test it with is a brand new 1.5V alkaline battery.
It would be worth checking the 9V battery in the meter. A bad battery will give all sorts of odd readings.
+1
Some cheap DMMs give higher voltage readings when the internal battery is getting low.
One of my DMMs does.
Check if the "low batt" sign is also being displayed.
Leo..