4-Wire Resistance Measurements - Workbench Wednesdays

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[warplanner]

Thanks for eight minutes of straight, clear, and coherent explanation without ANY bullshit and never ONCE did you resort to cliche phrases like "Hello, YouTube". Grateful for the effort!

[ybxnop]

Darn I've been learning this stuff for so long, watched so many videos but this is the only videos that made me understand the four wire measurement. Thank you!

[error]

Uppercase M is for Mega. Lowercase m is for milli.

[joefrancisramos]

Very nice video! I used four wire sensing method in measuring ON resistance of the MOSFET. Thanks for bringing light to my old questions

[rwd]

I got hold of two HP 3478a and had no idea what 4 wire resistance measuring I know. Thank you!

[gardenogauge]

Resistance thermometers often use the 4 wire method to overcome the effect of the lead length which can often be significant

[UnpredictableViolet]

One of the most important applications for the 4W measurement is in tracing out shorts on a PC board. Not measuring resistors.

[gammaraider]

Thanks for explaining! It's unlikely I'll ever need to use 4-wire measuring as I basically never use very small resistances, but it's good to know if it ever becomes relevant.

[kaybhee]

any idea how to measure e field, , and magnetics in and around wire...to test wire quality

[dzee]

Excellent Video in explaining the 4 wire Bench DMM. Too Bad hand held devices do not have that option. Looking at the $ wire measurement makes sense in measuring very small resistance. I was looking at build a milliohm meter for just that purpose but it would need to have leads that are no longer than a few inches. And it would only serve one purpose.

[TortureBot]

If you always make sure you're measuring resistance with the very tips of the leads, you probably don't have to worry that much about a difference do you?

Also, when moving your clip leads from the first resistor to the other and back, do you think it's possible that you are relocating the clips onto the original resistor at a slightly higher position on the legs or lower position? Or possibly the clips are getting a tighter bite before or after you clip them on the second time?

Would any of that make a difference?

[phildodd]

Goodnes ! How sophisticated that things are these days ! It must take special construction techniques to build a circuit using milliohms resistors - a lump of solder being "in circuit" would wreak havoc ! Thank you for this very useful primer on the subject !

[jimmysyar]

I used it when measuring the resistance of a piece of wire

[tonysfun]

Thanks for your videos! I like the way you explain it... I have question about your BTM: MP730028 5.5 digital bench-type digital multimeter. Can you make a review? I found it on Newark's website, but they have 2 versions - Why is one under $400 and the other over $500? What version are you using? The under $400 or the more expensive and why. I'm a subscriber now.

[PankajYadav-hrtp]

Hi There...nice video, but i have a doubt that in such measurements, why don't you go for bridge method of measurement

[michaelmounts]

I typically just use the “Rel” key to zero out lead resistance on meter before measuring…much simpler and extremely accurate. I use this festure prinarily dealung with op amps

[txkflier]

According to the specs on the MP730028 (200 Ohm range = 0.030% of reading + 0.005% of range), its uncertainty at 0.1 ohm is 10.03%. If you're checking a 10% resistor, you need a meter that's accurate to 2.5% in order to have a Test Accuracy Ratio (TAR) of 4:1. That meter is barely good enough to check a 1 ohm 5% resistor. At 1 ohm, its uncertainty is 1.03%..

[mumblic]

4:35 milli is written as "m" not as small capital "M" (=mega) Please respect the basics principles of the metric systems. No matter how small you make that "M" is still is mega Volt / mega Ohm!!

[kuglepen]

In you graphics you use a capital M to say mili. This is wrong. Capital M means mega. This is 101 stuff, and it is incredible that you would get something this elementary wrong.

[DonnyHooterHoot]

Totally unused by 99% of people who have it! I guarantee it.