Products > Test Equipment
Fluke 15B vs 115
aluminumfoilteslacoil:
So from what I can tell, they're both Chinese-made Flukes with 3yr warranties, but the 15B has more features and is cheaper. The only real notable difference I see is the 115 is labeled as TRMS, but that's just a basic math calculation, not like it costs any more to implement. So why does the 115 cost more when the 15B has more features?
I feel like Fluke has too many products, and it hurts my head.
BeBuLamar:
TRMS does cost more to make. Today the prices between TRMS and just RMS are not much different but in the old days it's a big thing. Also the price difference reflect 2 different lines of products. The 115 is made in Malaysia.
aluminumfoilteslacoil:
--- Quote from: BeBuLamar on October 28, 2024, 03:00:33 pm ---TRMS does cost more to make. Today the prices between TRMS and just RMS are not much different but in the old days it's a big thing. Also the price difference reflect 2 different lines of products. The 115 is made in Malaysia.
--- End quote ---
Thanks for the reply. I was trying to gauge which might be the better value for a electronic hobbyist. The main pull of the 15B I think would be the mA setting. But I'm curious how much that would practically matter for a hobbyist, seeing as mA can still be measured on the 115 with a bit more error. The 115 DCA setting says 1% + 3 digits for error (with .001 resolution), so if you were measuring a 100mA circuit on the 115, then you should get a measurement between 96mA and 104mA. I think for hobby purposes, that's plenty accurate. Correct me if I'm wrong.
BeBuLamar:
I do not see the 115 being less features than the 15B. I think it has more but not much.
TimFox:
In AC voltmeters, non-TRMS meters normally measure “mean absolute value”, which is relatively cheap to implement, and convert that to the RMS value of a sine wave with that “average” value (“average responding”).
This is reasonable for a sinusoid with low distortion, but gives inaccurate values for a square wave.
One problem with TRMS converters is that they often don’t work well at very low levels (compared with full scale), so an average-responding meter might be better when adjusting a device for a null (zero) voltage.
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