How to measure current draw - Electronic Circuits Projects Diagrams Free

zachtheterrible · 15th August 2004, 08:35 PM

Helloall. How do you measure current draw of a circuit? Do you just put the two leads of ur multimeter on the battery n connect the battery 2 the circuit? cuz that doesnt work 4 me.

andrew2022 · 15th August 2004, 08:40 PM

that wud measure voltage. to measure current, connect 1 side of the circuit to the battery and the other lead thru the multimeter (so the meter is in series with the circuit)

John Sorensen · 16th August 2004, 03:52 AM

I quit using my multimeter as a milli-ammeter, too many blown fuses. Hey, don't forget to put that thing back in "Volts" before taking a voltage reading doh!

Now I put a 1 ohm resistor in series wherever I want to measure current and measure the millivolt drop across it. Most of the time a 1 ohm resistor is negligible in the circuit, but you'll have to decide for yourself.

j.

mozikluv · 16th August 2004, 04:02 AM

hi,

connect your DMM is series with the +supply line. positive or red probe connected to the power source and the negative or black probe to the device power line. but be sure to have the DMM current selector in the appropiate value.

chemelec · 16th August 2004, 07:36 PM

If you have Already Connected your Amp-meter in parallel with the battery, You have PROBABLY BLOWN THE FUSE in it.

Before Proceding to connect it in series, Check the fuse or you won't get any Readings.

Gary

zachtheterrible · 16th August 2004, 08:51 PM

DOH DOH DOH

ops: . I cant believe that I forgot that . . . its all coming back 2 me now. thanx :lol:

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15th August 2004, 08:35 PM	(permalink)
zachtheterrible	How to measure current draw Helloall. How do you measure current draw of a circuit? Do you just put the two leads of ur multimeter on the battery n connect the battery 2 the circuit? cuz that doesnt work 4 me. __________________ I'm no electronics god, i just talk too much.

15th August 2004, 08:40 PM	(permalink)
andrew2022	that wud measure voltage. to measure current, connect 1 side of the circuit to the battery and the other lead thru the multimeter (so the meter is in series with the circuit)

16th August 2004, 03:52 AM	(permalink)
John Sorensen	I quit using my multimeter as a milli-ammeter, too many blown fuses. Hey, don't forget to put that thing back in "Volts" before taking a voltage reading doh! Now I put a 1 ohm resistor in series wherever I want to measure current and measure the millivolt drop across it. Most of the time a 1 ohm resistor is negligible in the circuit, but you'll have to decide for yourself. j.

16th August 2004, 04:02 AM	(permalink)
mozikluv	measuring current draw hi, connect your DMM is series with the +supply line. positive or red probe connected to the power source and the negative or black probe to the device power line. but be sure to have the DMM current selector in the appropiate value. __________________ \"NONE BUT THE BRAVE DESERVES THE FAIR\" ~Shakespeare~

16th August 2004, 07:36 PM	(permalink)
chemelec	If you have Already Connected your Amp-meter in parallel with the battery, You have PROBABLY BLOWN THE FUSE in it. Before Proceding to connect it in series, Check the fuse or you won't get any Readings. Gary

16th August 2004, 08:51 PM	(permalink)
zachtheterrible	DOH DOH DOH ops: . I cant believe that I forgot that . . . its all coming back 2 me now. thanx :lol: __________________ I'm no electronics god, i just talk too much.