How to measure an unknown resistor?

Screech

New Member

• Feb 8, 2004

• #1

How to measure an unknown resistor?
Whats the correct and safe-to-multimeter way to do this?

Do I set the electronic multimeter to 2meg first, then work my way down the ranges? Or is it the other way?

Also, can I damage the multimeter when measuring an unknown 4.7Meg resistor when setting the meter at 2Meg range?

 

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mixos

New Member

• Feb 8, 2004

• #2

Hello Screech

You can use it both ways.. there is no posibillity to damage the resistor or the multimeter... just connect the resistor and play with the scale.

 

Screech

New Member

• Feb 8, 2004

• #3

Will do.
Thanks Mixos.

 

mozikluv

New Member

• Feb 8, 2004

• #4

checking unknown resistance

hi screech,

just make sure that when you measure the resistance the power supply is OFF. :wink:

 

Screech

New Member

• Feb 8, 2004

• #5

Damn! It would be good if I could do it with the power on. OH,well. :?

 

mozikluv

New Member

• Feb 8, 2004

• #6

checking resistance

hi screech,

if a meter can be invented to measure a resistor resistance while the power is on in the circuit, that person will be an instant billionaire. 8) :lol: :lol:

forgetfulness is inherent to mankind :wink:

 

Exo

Active Member

• Feb 9, 2004

• #7

Re: checking resistance

mozikluv said:

if a meter can be invented to measure a resistor resistance while the power is on in the circuit, that person will be an instant billionaire. 8) :lol: :lol:

Click to expand...

Use a combination of a Clamp meter (to measure the current trough the resistor) and a Volt meter (to measure the voltage drop accross the resistor), and you can calculate the resistance ...

...Am I a billionaire now ? ... where's that porche

 

buloi123

New Member

• Feb 9, 2004

• #8

If you'll use the ohmeter to mesure the resistance, take the resistor out of the circuit and measure it... Some of the circuit components may affect resistance...

 

niq_ro

New Member

• Feb 10, 2004

• #9

to measure a 4,7Mohm with a a ohm-meter at 2Mohm range.. do this.. use a 1Mohm resistor

 

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sunil.s

New Member

• Jun 30, 2011

• #10

It would be good if you set the multimeter to the high value of resistance and then start reducing it when you see the symbol "l" in the multimeter.That symbol indicates that you have chosen wrong range for the resistance.