Products > Test Equipment

Sensitive LCR Meter Measurements

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Martin72:
Jeez, this is a lot they offer...

And you're right, not a single cable goes over 100kHz(except the ones with a smd tweezer) - that needs to be clarified, I'll write to sourcetronic.

mawyatt:
Yeah, those are ones we've been looking at, rated to 5MHz. They look exactly like the CS versions we have (rated to 100KHz).

Even the Clips look identical and from the images looks as if the Kelvin Handles are the same with the "exposed" unshielded conductor blades.

Begs the question, what's the difference, maybe the cables....or maybe they are just tested at 5MHz??

Best,

Martin72:
I'll find out, the guys from Sourcetronic are even in the same city where I live...
Maybe it's actually the cables.
10kHz/100kHz is still more “LF”, where the properties of coax cables still play a subordinate role.
But what do you do in the Mhz range, where cables with their pFs already play a parasitic role....

Martin72:
I have now written to them and asked for a data sheet, together with an explanation as to why.
The things look so similar, but it may well be that the cables from Sourcetronic do not come from TongHui or are “different” and are manufactured by TongHui for Sourcetronic.
We will know soon.

mawyatt:

--- Quote from: Martin72 on July 26, 2024, 11:01:22 pm ---I'll find out, the guys from Sourcetronic are even in the same city where I live...
Maybe it's actually the cables.
10kHz/100kHz is still more “LF”, where the properties of coax cables still play a subordinate role.
But what do you do in the Mhz range, where cables with their pFs already play a parasitic role....

--- End quote ---

It's not so much the cables capacitance as the exposed cable signal fields that are an issue. If the cable shields were carried up to the Kelvin Clip tips like the Tonghui TH26009B Kelvin Tweezers, this would increase the over cable capacitance but produce better results because the cable signal fields are no longer exposed along the handle. So the Kelvin Clip Handles wouldn't have exposed signal fields which your hand changes and thus changes the measurement underway, only the Kelvin tips would have exposed fields but these are near the DUT, and far from your hands and not influenced by such.

Honestly quite surprised they are made this way with the long exposed conductive blade to tip instead of a short conductive tip connected to a shielded wire going thru the handle, as it wouldn't be difficult to carry the cable shields right to the short conductive Kelvin Clip tips.


All the Kelvin Clips we have, and we have quite a few expensive and cheap, are not shielded up to the Clip tips with exception of the Tonghui Tweezers, probably reason they are expensive and rated to 15MHz :-+

Best,

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