| Products > Test Equipment |
| Sensitive LCR Meter Measurements |
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| Martin72:
--- Quote ---After all, don't think Tonghui (and others) would use a shield if it provided no measurable benefit --- End quote --- I didn't say that either, see the corresponding post. Nor did I think so. ;) |
| mawyatt:
--- Quote from: Martin72 on August 24, 2024, 07:58:49 am --- --- Quote ---After all, don't think Tonghui (and others) would use a shield if it provided no measurable benefit --- End quote --- I didn't say that either, see the corresponding post. Nor did I think so. ;) --- End quote --- Of course you didn't!! Just say'n it's there for a reason for others that might not have followed the entire SMD fixture threads. BTW is the shield and case aluminum or steel? The Tonghui Kelvin Clip base fixture that connects to the LCR Meter has a Steel case, the cover is Aluminum. Suspect this base is for rigidity holding the 4 BNC connectors, rather than any H field shielding. This doesn't have a shield partition, but the 4 wires are coaxial shielded up to the BNC connection with shields soldered directly to BNC lugs. Best, |
| Martin72:
I can test this later with a magnet. The separation/shielding in the ST fixture should be made of tinplate, aluminum is not so easy to solder. It “feels” like the NoName is even heavier, although there is less “inside”. ;) Whether the relatively low frequency of 100kHz already makes a difference would have to be compared with the nomogram, where the accuracy of the ST2830 actually lies when 10p is measured at 100kHz. Or you can approach it in comparisons, from say 1khz upwards - people with an LCR sweep would be fine there.... Martin |
| Martin72:
--- Quote ---It “feels” like the NoName is even heavier, although there is less “inside” --- End quote --- It is heavier.. ;) And so are the contact resistances, here as an example from ground to ground. |
| mawyatt:
3 ohms is considerable, try measuring between the static plunger and the BNC shell for each. The lever arm doesn't really matter as it's not conducting nor shielding any signal. The BNCs provide the connection back to the LCR Meter are important wrt any shield currents getting back to the instrument. BTW our "Good" Standard SMD fixture weights ~291g and is all Aluminum, our "Other" Standard SMD fixture has been repurposed to include external DC Bias Capability within, it's also all Aluminum and weighs ~318g but has a lot of extra "stuff" inside for the added DC Bias Capability! Best, |
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