DMM HELP ?

• Jul 26, 2008

• #1

J

jamie.91

Guest

hi i know the pic aint great but its the only one i could find lol
the problem is i want to measure the mA of my laser to determin the mW but i dont know what settings my new DMM needs to be on lol, can anyone help ?

also how do i measure say the resistance of a component if thats possible ?

thanks

 

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• Jul 26, 2008

• #2

E

el-taco

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You cant determine the mW from the mA.

You could have an educated guess at best.

 

• Jul 26, 2008

• #3

J

jamie.91

Guest

the guy who i baught the diode off said that at 125mA i will be getting 83mW so i was hoping to achive 125 mA but dont know how to use my new dmm

 

• Jul 26, 2008

• #4

FireMyLaser

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Set it to (line dotted) A -> 200m and the red probe in the middle socket. That means it can measure up to 200mA. If you want more than that, set it to A -> 10 and put the red probe in the 10A socket. The black probe always go to the com socket.

 

• Jul 27, 2008

• #5

J

jamie.91

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hmm thanks i will try this soon as possible lol

thanks

 

• Jul 28, 2008

• #6

phoenix77

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Take some time, sit down with your DMM & the INSTRUCTION MANUAL & read up on how to operate it. Thats what I did when I switched from my old ANALOG METER to my new DIGITAL MM. Hope this helps you like it helped me phoenix77/rob

 

• Jul 28, 2008

• #7

R

rp181

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my mm has a 10A limit, didnt know what setting to put on, and i decided to see how much my lead acid battery was giving to my electrolysis cell, i connected it directly to the battery, bad idea... Probe wires got hot, and a little insulation melted, but thankfully it still works =)

In otherwords, be carefull not the connect directly to power supply, always put in seris with load.

 

• Jul 28, 2008

• #8

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50Freestyle

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Can I test mA with this DMM? I had it lying around but I can't firgure out how to get mA with it. Found the picture but it wont let me put it on here. If someone doesn't mind, could they take a look here http://www.sperryinstruments.com/sperry/images/productslarge/dm-210a.jpg.

Thanks,

 

• Jul 28, 2008

• #9

R

rp181

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no, only resistance and voltage.

 

• Jul 28, 2008

• #10

J

jamie.91

Guest

thanks for the help but the manual is useless amd im still none the wiser
lol

but persistance i do have lol

thanks

 

• Jul 29, 2008

• #11

M

Maven

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50Freestyle,


well if you really wanted the Current you could put a resistor in series with the module and measure the voltage drop across the resistor and use ohm's law to determine the current

current = voltage / resistance

since the current through the resistor would be the same as the current through the circuit connected in series with it then the current you calculated through the resistor would be the same as the current the circuit was using ..

however the higher the value of the resistor the more it will limit the current that goes into the circuit

 

• Jul 29, 2008

• #12

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Yeap, I figured I could only test voltage with it. Its not my only one, my other can test mA so I'm all set.

Thanks