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LCR Cal Test PCB

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Martin72:

--- Quote from: KungFuJosh on September 05, 2024, 11:04:25 pm ---I got the Hioki 3532-50 working, and ran it through the Cal Test PCB.
Looks decent, but could definitely use a calibration/adjustment from Hioki. PDF attached.

--- End quote ---

Especially in the resistance range, it looks as if something high-impedance is lying parallel in the measuring path.
Possibly check the front end.

mawyatt:

--- Quote from: KungFuJosh on September 10, 2024, 01:02:36 am ---Here they are with the test PCB. These values are very sensitive with the kelvin clips.

--- End quote ---

Try using Low Z ON if possible, unless worried about DUT damage with high current. This provides more DUT current with low Z components and thus creates a higher measurement voltage which improves measurements :-+

You need to do a Cal with it ON as well.

BTW think your previous post should be 100nH and 10nH, not nF!!

Best,

KungFuJosh:

--- Quote from: mawyatt on September 10, 2024, 06:06:05 pm ---Try using Low Z ON if possible, unless worried about DUT damage with high current. This provides more DUT current with low Z components and thus creates a higher measurement voltage which improves measurements :-+

You need to do a Cal with it ON as well.

--- End quote ---
I will give that a try, thank you.


--- Quote ---BTW think your previous post should be 100nH and 10nH, not nF!!

--- End quote ---
I switch those around so frequently it's ridiculous. I usually catch them and edit before anybody notices though. 😉


--- Quote from: Martin72 on September 10, 2024, 05:33:49 pm ---Especially in the resistance range, it looks as if something high-impedance is lying parallel in the measuring path.
Possibly check the front end.

--- End quote ---
Interesting point. I'm not in a rush to open it back up, but I'll probably need to check that out. I didn't see anything astray when I cleaned it (gently) before closing it up. If only I could get a schematic for it. 🙄

ETA: I thought about it more, and that doesn't make sense to me. Every measurement range is separated by resistance level. 1M and 10MΩ are separate levels (you can hear the relays click as it switches through the different ranges from .1Ω to 100MΩ), and I can't think of any single thing in the front end that would throw them both off by ~50%. If a 10M resistor found its way there, that would make sense in the 10M range, but the 1M range shouldn't drop lower than 90%.

Is there anything besides needing adjustment that would set two separate ranges apart? Or maybe the resistance ranges are in series? If that's the case, then there would need to be something around the 1MΩ position to throw off only the higher ranges. I should test the 100MΩ range and see what that looks like. I still don't know what could throw both ranges off by ~50%.

My hope is that those ranges only need adjustment. What do you think?

Thanks,
Josh

mawyatt:
Could this be the Cal values got messed up for the Resistance Ranges?

Best,

KungFuJosh:

--- Quote from: mawyatt on September 10, 2024, 11:45:28 pm ---Could this be the Cal values got messed up for the Resistance Ranges?

--- End quote ---

That's my theory. 100k is slightly off, and 1M and 100M are at 50%. I don't know what would have messed them up. The device is 23 years old, it's time for an adjustment. If I can figure out how. 😉

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