ohm meter help
- Thread starter cnguyen
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The first thing to know is that all measuring equipment needs to be calibrated. That means: how do you know it is right? What have you measured with it that you already know the value for?
So to do a shortcut calibrate on that device - a quick check - I'd measure something with an accurate (and calibrated) ohm meter then put it on your tobeco meter and see what it reads. Currently it could be reading + 0.5 ohm for example, and you would have no way of knowing.
I don't know how you will get out from under, in your situation, as you probably don't have anything to check with. One answer is you go to an electronics store, have them give you a 2 ohm resistor, get them to measure it accurately there and then, write down the resistance, put it on the tobeco meter, and see what it reads. That will give you an idea of how it's reading: under, correct or over. How much over, you write down, then subtract that from all readings.
Now put it in your rda and tighten up the posts, and read the rda resistance. Adjust the figure with the calibration factor (say minus 0.5 ohm). Now you know how the dripper and a coil together measure.
By the way, when they measure the resistor for you down at the electronics shack, make sure they subtract the meter overhead. You set the meter to the lowest ohm range (could be 20 ohms), or to just to ohms if it's auto-ranging, then touch the red and black probes together, then read the result. Unless it's an expensive meter there will be some overhead: maybe 0.2 ohm. This is the resistance in the probes and probe connector sockets and soldering. You take that figure off anything you read with that meter, so if you're testing a "2 ohm resistor" and it reads 2.3 ohms on that meter, you take off 0.2 ohms, and the actual value is 2.1 ohms.
So to do a shortcut calibrate on that device - a quick check - I'd measure something with an accurate (and calibrated) ohm meter then put it on your tobeco meter and see what it reads. Currently it could be reading + 0.5 ohm for example, and you would have no way of knowing.
I don't know how you will get out from under, in your situation, as you probably don't have anything to check with. One answer is you go to an electronics store, have them give you a 2 ohm resistor, get them to measure it accurately there and then, write down the resistance, put it on the tobeco meter, and see what it reads. That will give you an idea of how it's reading: under, correct or over. How much over, you write down, then subtract that from all readings.
Now put it in your rda and tighten up the posts, and read the rda resistance. Adjust the figure with the calibration factor (say minus 0.5 ohm). Now you know how the dripper and a coil together measure.
By the way, when they measure the resistor for you down at the electronics shack, make sure they subtract the meter overhead. You set the meter to the lowest ohm range (could be 20 ohms), or to just to ohms if it's auto-ranging, then touch the red and black probes together, then read the result. Unless it's an expensive meter there will be some overhead: maybe 0.2 ohm. This is the resistance in the probes and probe connector sockets and soldering. You take that figure off anything you read with that meter, so if you're testing a "2 ohm resistor" and it reads 2.3 ohms on that meter, you take off 0.2 ohms, and the actual value is 2.1 ohms.
Hi cnguyen and welcome to the forum!
What Roly said above is spot on. Especially true for the less expensive meters, but really tue for all meters.
Hope it helps and Happy Vaping!
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