A DMM upto 20$ with PC connection for logging?

[TomerP]

Hi, is there a DMM with a PC connection for logging (either USB/COM) that also costs less than 20$?

[jpb]

It would probably need to be second hand if there was one.

If accuracy is not that important then alternatives such as the analogue inputs on a rasberry pi might be an option.

[Lightages]

The least expensive data logging meter that I know of is the Digitek DT-4000ZC, also known as TekPower TP4000ZC. They sell for around $40.

[retiredcaps]

The least expensive data logging meter that I know of is the Digitek DT-4000ZC, also known as TekPower TP4000ZC. They sell for around $40.

It first sold for around $29 USD when I brought it to Martin's attention 5+ years ago.  Then it got popular and sellers raised prices.

http://www.mjlorton.com/forum/index.php?topic=81.0

[Fungus]

Hi, is there a DMM with a PC connection for logging (either USB/COM) that also costs less than 20$?

What do you need to measure? How accurate?

[TomerP]

Vdc and Current, as accurate as 1% I guess.

[Fungus]

Vdc and Current, as accurate as 1% I guess.

How many volts? How many amps? Will you need to switch voltage ranges or is it fixed?

[TomerP]

220v ac, much less dc, up to 30 amper (I don't know if its a reasonable requirement for that price range)

[Fungus]

220v ac, much less dc, up to 30 amper (I don't know if its a reasonable requirement for that price range)

a) You don't really need to measure 220V AC, it hardly ever gives a wrong value (not unless you're using a generator or something).
b) Look into current clamps for Arduino.

https://encrypted.google.com/search?q=arduino+current+clamp

[TomerP]

true, but measuring dc voltage of up to lets say 50v is something I'd like to be able to do with it

[Fungus]

true, but measuring dc voltage of up to lets say 50v is something I'd like to be able to do with it

Make a 10:1 resistor divider, connect it to the Arduino.