General > General Technical Chat

Silicone vs. PVC measuring leads

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bdunham7:

--- Quote from: tooki on May 06, 2024, 07:46:21 pm ---Nobody sells multimeter test leads with PTFE (Teflon) insulation because Teflon is way too stiff.

--- End quote ---

Well, actually these are teflon-core coax.  But yeah, they're stiff.

https://www.fluke.com/en-us/product/accessories/test-leads/tl2x4w-ptii

tooki:
Yeah, looks like RG316. But I’d argue those fall squarely into the “not everyday probes” I explicitly qualified in that reply. ;)

shabaz:

--- Quote from: tooki on May 07, 2024, 09:17:43 am ---What is its actual cross-section? Because the specs cannot be correct: they say it’s 24AWG (which is 0.22mm2) but they also specify it as 0.5mm2. Both cannot be true.

--- End quote ---

Hi! The 24AWG is incorrect (I compared it to 24 AWG enamelled copper wire, and the ECW is much thinner), it's 0.5 mm^2. Unfortunately CPC has no stock of the red wire of that type currently, only black wire.
While I was at it, I took a photo of various wires, attached below. The TPE wire (third in the photo) has attracted a lot of dust that sticks to it : ( It might wipe off with a wet-wipe but I didn't try that. The RS wire (last in the lineup) had some dust that wiped right off, it's very smooth and non-sticky.

Gyro:
Note that only the Concordia ones are double insulated / damage evident. This will be important for some applications.

bdunham7:

--- Quote from: tooki on May 07, 2024, 04:04:06 pm ---Yeah, looks like RG316. But I’d argue those fall squarely into the “not everyday probes” I explicitly qualified in that reply. ;)

--- End quote ---

Well, actually the marketing for those has two selling points.  The first is being able to get accurate resistance readings more conveniently or where kelvin clips won't work.  The other is that you can use one set of probes for all your measurements without exceeding the voltage limits of the SENSE connections since the meter automatically disconnects that side when you select voltage ranges.  This is how I use mine--as everyday probes that stay connected full time.  They work just like any other probe set except my low resistance readings are very accurate.  I have the earlier, more flexible version, the newer ones are usable but not very nice.

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