Electronics > Beginners

Multimeters and Resistors

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sleemanj:

--- Quote from: IanB on November 24, 2017, 10:20:55 am ---It's one of those little CEN-TECH meters from Harbor Freight. It has manual ranges 200, 2000, 20k, 200k, 2000k. It shows 1 on the left of the display if it's over range, otherwise it displays the value.

To measure a resistor you start on the 200 range and if the display shows 1 you turn the dial up through the ranges until you see a value. Then you read the value off the display.

--- End quote ---

Yes I have a similar model in front of me, but the poster said his doesn't work like that ("(1s are always printed from the right)")  So I'm a little confused.

Anyway, to the poster.

Make sure that you understand

  1. To measure resistance you need the probes in the COM and the V/Ohm/mA sockets (the bottom two sockets)
  2. The symbol for resistance is Omega (a curvey n with feet)
  3. the resistance ranges bottom left quarter of the dial are 2000k through 200
  4. the ranges with "k" suffix measure in k, 123.4 means 123.4 kohms
  5. the ranges without a suffix measure in ohms, 123.4 means 123.4 ohms
  6. if it prints just "1" on the left side of the display, that means it's over-range, move the dial one place clockwise to go to the next range




IanB:
Here's a picture of the meter measuring a 1.8 k resistor (1800 ohms) on the 2000 ohms range:

IanB:

--- Quote from: sleemanj on November 24, 2017, 10:25:31 am ---Yes I have a similar model in front of me, but the poster said his doesn't work like that ("(1s are always printed from the right)")  So I'm a little confused.
--- End quote ---

I'm pretty sure it does work like that. I think the OP is just in a bit of a muddle.

Kohlrak:
https://78.media.tumblr.com/569d5f0239d37dc134568fbafd320c8a/tumblr_ojyg1iC6TK1vhaphlo1_r1_500.gif


--- Quote from: IanB on November 24, 2017, 10:36:10 am ---Here's a picture of the meter measuring a 1.8 k resistor (1800 ohms) on the 2000 ohms range:



--- End quote ---

What're the odds you'd have the same one? So, basically, i'm reading the thing wrong, that there's no need to take the output and divide by said number or multiply by said number, which was what i was interpreting so far. So, if I see 1 at 200, I should assume it's either out of range, or i'm dealing with 1 ohm, right?

It seems strange to me that it'd have so many modes if the real limitation is the 4 digits. Anyway, it seems at this point my goal is to look for what i think to be brown gray silver gold (I should have one, as i have more than just that one resistor pack), then throw my multimeter to 2000 and make sure it's similar, then see how it reacts when i set it to other ranges.

I do assume that if i set the thing to 20k i'll have to add some zeros. How many, though?

What's hFE?

And what do I do with the, what i'm asusming to be, some sort of transistor testers? There's 4 pin holes for NPN and PNP respectively.


--- Quote ---I'm pretty sure it does work like that. I think the OP is just in a bit of a muddle.
--- End quote ---

Could be that, too. Issue being, it's hard to concisely experiment when you have 2 variables and no controls. Once I go through these resistors with this image I should be able to go at least a little on my own from there. Just need to figure out how it handles resistors outside of the normal display range at this point, then.

As for the other replies, wow, reply rates seem to be much higher here than i'm used to for tech related forums.

IanB:

--- Quote from: Kohlrak on November 24, 2017, 11:07:29 am ---Anyway, it seems at this point my goal is to look for what i think to be brown gray silver gold
--- End quote ---

A 1.8k resistor (1800 ohms) is brown gray red (18 followed by 2 zeros).


--- Quote ---So, if I see 1 at 200, I should assume it's either out of range, or i'm dealing with 1 ohm, right?
--- End quote ---

If out of range the meter shows a 1 on the left and a dot on the right. If you measure a 1 ohm resistor you will see something like 01.3 on the display.

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