This doesnt explain what will happen if 100V or so, will apear

File: digital-multimeter.jpg (546KB, 2000x1274px) Image search: [Google]

546KB, 2000x1274px

>>1148228
Op here, this one also.

>>1148228
theres no input protection

File: cmos-device-protection-circuit.jpg (39KB, 927x376px) Image search: [Google]

39KB, 927x376px

>>1148228
There's (at least) R16 to limit current and CMOS circuits usually have diode clamps like in pic related in their inputs.
So, if you apply 100V to the input, you can expect around 80µA fault current to flow to VCC or GND, depending on polarity.

That said, these cheap chinaman meters aren't exactly known for their robustness.

>>1148445
>>1148306
Thanks. So how could i make protection? I make my own meter and i was like - what if i slam 50V spike in 2V range.

So i assume that if there is in resistor like 1M, diodes protection then current will be so low that it would be safe? What about higher voltage?