Products > Test Equipment

LCR Cal Test PCB

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KungFuJosh:
My old version (I think V1) of the Cal Test PCB went up to 1GΩ so I was able to test 100MΩ on there. It shows about ~80MΩ, so 20% less than the nominal value. Whether it's actually off or not, I don't know, but it does tell us that only the 1M and 10M ranges are goofy.

KungFuJosh:
Looks like the 100M range is probably ok on the 3532-50. At 1kHz, the IM3570 is reasonably close.

At 5Hz the IM3570 reads it verry niiiice.

KungFuJosh:

--- Quote from: KungFuJosh on September 07, 2024, 11:32:23 pm ---Here's the Gerbers and BOM for the LCR Cal Test V5 PCB.

--- End quote ---

BOM updated again. Mouser incorrectly had 100nH listed on what was actually a 100µH inductor. This is why I always test all parts, no matter where they come from.

Kean:

--- Quote from: KungFuJosh on September 13, 2024, 08:54:48 pm ---BOM updated again. Mouser incorrectly had 100nH listed on what was actually a 100µH inductor. This is why I always test all parts, no matter where they come from.

--- End quote ---

For those playing along...
The wrong part is Murata LQM21DN101M70L - listed as 100 nH, but actually 100 uH (I've reported the error on website)
The replacement is TDK TMS201610ALM-R10MTAA - confirmed as 100nH on datasheet. It is 2016 metric so 0806 rather than 0805 - close enough.

I haven't ordered the parts or PCBs yet, but probably will next week.
If anyone else in Australia wants one, I may have some PCBs and parts available.  I probably won't buy multiples of all parts, as it works out about AUD $50 per set.

KungFuJosh:

--- Quote from: Kean on September 14, 2024, 11:13:38 am ---I probably won't buy multiples of all parts, as it works out about AUD $50 per set.

--- End quote ---

For the cheap stuff, get multiples, especially the 0805 stuff. I find at least 1 or 2 0805 goes flying across the room per project. 🤣

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