I need help using my digital multimeter!

  • Thread starter richyw
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  • #1
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Main Question or Discussion Point

Hi, this might seem like a really stupid question, but I am not sure how the scale works on my digital multimeter. I am trying to measure the resistance across a photocell in the light and in the dark.

I was given this digital multimeter as a gift, but am unsure how to use it. The instructions do not really help. What I did was switch the dial to where there was an omega symbol, assuming that would be the place to be for resistance!

So there are 5 different settings, 200, 2000, 20k, 200k and 2000k. I am guessing that these will select my "range" much like other meters I have used in the lab. So now I have found one measurement. It displays 5.84 on the "200k" setting.

So what the heck resistance does that work out to?

I've watched like 3 youtube videos and I think they all skip over this because it is so trivial!
 

Answers and Replies

  • #2
vk6kro
Science Advisor
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If your meter has ranges of 200, 2000, 20k, 200k and 2000k, this means the maximum resistance it can measure on those ranges is 199.9 ohms, 1999 ohms, 19990 ohms (19.99 K), 199900 (199.9 K) and 1999000 ohms(1999 K), assuming this is a 4 digit meter with the first figure no more than 1.

So, you couldn't get a reading of 5.84 on the 200 K scale because that can only give one decimal place (up to 199.9 K ohms).

However, you could get that reading on the 20 K scale. It would mean that your resistor was 5840 ohms approximately. That is 5.84 K.
 
  • #3
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sorry I am still very confused. why can I not get 5.84 on the 200k scale? I'm pretty sure I got that.
 
  • #4
vk6kro
Science Advisor
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sorry I am still very confused. why can I not get 5.84 on the 200k scale? I'm pretty sure I got that.
Assuming you have a 4 digit meter, you will see that the decimal point on that scale is one digit in from the right hand side.
So, you could get a reading of 5.8 or 5.9 but not 5.84.
 

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