Author Topic: LCR Cal Test PCB  (Read 16871 times)

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Offline KungFuJoshTopic starter

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Re: LCR Cal Test PCB
« Reply #175 on: September 11, 2024, 12:48:27 am »
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.
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Offline KungFuJoshTopic starter

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Re: LCR Cal Test PCB
« Reply #176 on: September 11, 2024, 01:13:02 am »
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.
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Offline KungFuJoshTopic starter

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Re: LCR Cal Test PCB Gerbers and BOM
« Reply #177 on: September 13, 2024, 08:54:48 pm »
Here's the Gerbers and BOM for the LCR Cal Test V5 PCB.

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.
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Online Kean

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Re: LCR Cal Test PCB Gerbers and BOM
« Reply #178 on: September 14, 2024, 11:13:38 am »
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.

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.
 
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Offline KungFuJoshTopic starter

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Re: LCR Cal Test PCB Gerbers and BOM
« Reply #179 on: September 16, 2024, 05:58:02 pm »
I probably won't buy multiples of all parts, as it works out about AUD $50 per set.

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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Offline KungFuJoshTopic starter

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Re: LCR Cal Test PCB
« Reply #180 on: September 16, 2024, 06:44:53 pm »
I got the replacement 100nH in today, and it looks good.
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Offline watchmaker

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Re: LCR Cal Test PCB
« Reply #181 on: October 04, 2024, 09:09:03 pm »
Thanks for the board Josh.  Just ordered the parts; both Mouser and Digikey are backordered on the 10v  1000uF Tant.
Regards,

Dewey
 
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Offline KungFuJoshTopic starter

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Re: LCR Cal Test PCB
« Reply #182 on: October 04, 2024, 11:41:34 pm »
Thanks for the board Josh.  Just ordered the parts; both Mouser and Digikey are backordered on the 10v  1000uF Tant.

You're welcome!

I added an alternate 1000uF cap to the BOM, see if you can get them to add it to your order, or swap them out.
"Right now I’m having amnesia and déjà vu at the same time. I think I’ve forgotten this before." - Steven Wright
 

Offline KungFuJoshTopic starter

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Re: LCR Cal Test PCB
« Reply #183 on: October 10, 2024, 01:59:40 pm »
For anybody curious about the Step D Factor test results, here's what to expect with the Panasonic resistors in the BOM:

Measured cap + standard values:
29Ω = 0.00018 (cap only YMMV - test your cap and adjust the rest)
79Ω = 0.00049 (29Ω + 50Ω)
162Ω = 0.00101 (29Ω + 133Ω)
797Ω = 0.00506 (29Ω + 768Ω)
1609Ω = 0.01010 (29Ω + 1.58k)
16029Ω = 0.10071 (29Ω + 16k)
160029Ω = 1.00530 (29Ω + 160k)
« Last Edit: October 10, 2024, 08:14:04 pm by KungFuJosh »
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Offline KungFuJoshTopic starter

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Re: LCR Cal Test PCB
« Reply #184 on: October 12, 2024, 02:43:57 pm »
For anybody else wondering:

Wah inductors are for Wah Wah guitar pedals. Typically 500mH to 700mH. You can google "Wah Inductor," or look for "Red Fasel inductor" if you want to populate that.

Thanks,
Josh
"Right now I’m having amnesia and déjà vu at the same time. I think I’ve forgotten this before." - Steven Wright
 
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Offline watchmaker

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Re: LCR Cal Test PCB
« Reply #185 on: October 12, 2024, 07:41:07 pm »
OK Josh, I am ready to populate your board.

My first attempt at SMDs.  Thankfully I am used to screws smaller than 402.  All the ckt does is running lites, but it gave me confidence.  The trace from pin 7 of the 555 to the caps was bad; that took more time than soldering.

I even replaced the 555 before finding the issue.  Now I know I can desolder as well.

You certainly need tweezers for measuring SMD caps.

Was trying to figure out what EEE stood for until I realized it 333!  Lot to learn.

Regards,

Dewey
 
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Offline KungFuJoshTopic starter

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Re: LCR Cal Test PCB
« Reply #186 on: October 12, 2024, 08:20:47 pm »
My first attempt at SMDs. 

I've done a few of those test/learning boards before I got into SMT. It really is helpful.

The good news is that my LCR boards are generally hand-solder pads, so you have extra room to solder if you don't have hot air.

Thanks,
Josh
"Right now I’m having amnesia and déjà vu at the same time. I think I’ve forgotten this before." - Steven Wright
 

Online Martin72

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Re: LCR Cal Test PCB
« Reply #187 on: October 12, 2024, 08:36:13 pm »
Quote
I've done a few of those test/learning boards before I got into SMT. It really is helpful.

I still remember my first attempt over 10 years ago....
Test board, SMD solder paste applied, then various 1206 capacitors placed on the corresponding pads.
And then I switched on the “SMD hot air tool” from the lab, held it on - and all the capacitors blew away with it....
 
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Offline KungFuJoshTopic starter

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Re: LCR Cal Test PCB
« Reply #188 on: October 12, 2024, 08:49:50 pm »
I still remember my first attempt over 10 years ago....
Test board, SMD solder paste applied, then various 1206 capacitors placed on the corresponding pads.
And then I switched on the “SMD hot air tool” from the lab, held it on - and all the capacitors blew away with it....

 :-DD Classic!

The boards I used went down to 0402 and 0603. I watched a youtube video before attempting, and it said to be careful of the hot air pressure. 😉
"Right now I’m having amnesia and déjà vu at the same time. I think I’ve forgotten this before." - Steven Wright
 
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Offline watchmaker

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Re: LCR Cal Test PCB
« Reply #189 on: October 12, 2024, 09:03:26 pm »
Interesting.  I do have a got air gun but I just used my Ersa Pico.  I put some solder on one pad, pinned one end or one leg and did the other(s) and went back.

Also used flux paste applied with toothpick at times.

What are the ways this task is done?  Given the cost differential, I can see the advantages of SMDs.  OTOH, not sure I want to go down the rabbit hole of PCB design.  I wonder if I could do something using protoboard?
Regards,

Dewey
 

Offline KungFuJoshTopic starter

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Re: LCR Cal Test PCB
« Reply #190 on: October 12, 2024, 11:35:20 pm »


That's a good start. There are other videos, but in general, Pace has awesome stuff.

Martin should pay attention to this one too. 😉😉
« Last Edit: October 14, 2024, 03:44:48 am by KungFuJosh »
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Online Kean

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Re: LCR Cal Test PCB
« Reply #191 on: November 12, 2024, 10:25:55 am »
I've had the LCR Cal PCBs sitting here for over a month, and last week I finally got around to ordering the components.
My Mouser shipment arrived today with 37 little bags of parts (a few are for another project).
I don't think I'll be setting this job up on the PnP...
Fun times ahead.  Thanks Josh!
 
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Offline KungFuJoshTopic starter

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Re: LCR Cal Test PCB
« Reply #192 on: November 12, 2024, 03:27:56 pm »
Hurry up and build it, everybody wants to know what color PCB you chose. 😉
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Offline KungFuJoshTopic starter

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Re: LCR Cal Test PCB
« Reply #193 on: December 07, 2024, 04:37:49 am »
I decided I wanted a slightly different board for DMM testing, so I made one. There's some overlap with LCRs on there too, so I improved the Kelvin connection setup. Now all the Kelvin connections use split SMT pads, and sense/source are consistently marked.

Whatcha think?

Thanks,
Josh
"Right now I’m having amnesia and déjà vu at the same time. I think I’ve forgotten this before." - Steven Wright
 
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Offline KungFuJoshTopic starter

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Re: LCR Cal Test PCB
« Reply #194 on: December 08, 2024, 09:05:44 pm »
Scratch that lol. I realized I don't want 2 test boards, so I combined the LCR and DMM stuff.

Any thoughts before I impulsively order these?

« Last Edit: December 08, 2024, 09:08:36 pm by KungFuJosh »
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Online Martin72

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Re: LCR Cal Test PCB
« Reply #195 on: December 08, 2024, 09:54:55 pm »
You design the circuit boards in your sleep, don't you... ;)
I probably won't finish populating my circuit board until I've bought a new soldering station; I'm not satisfied with the one I have now.
In principle, I find the idea of being able to test as much as possible with a single board appealing.
The design so that the Kelvin clamps fit is also good.
If I were to design something like this, however, I would reduce the number of measuring components and implement the line paths as shown on the L/C option of DMM Check+.
Even if it wouldn't be necessary due to the option of using Kelvin lines, it would be for gut feeling. ;)
Maybe I will do that, because we had two options to choose from.



 
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Offline KungFuJoshTopic starter

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Re: LCR Cal Test PCB
« Reply #196 on: December 08, 2024, 09:58:17 pm »
The line method on the L/C option makes it so you can't use kelvin clips at all, and that's half the purpose of this design. 😉
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Online Martin72

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Re: LCR Cal Test PCB
« Reply #197 on: December 08, 2024, 10:17:16 pm »
You can also measure on the board with Kelvin clips, I know that for certain reasons.
But yes, the compensation then only goes as far as the test pins, that is true.
 
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Offline KungFuJoshTopic starter

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Re: LCR Cal Test PCB
« Reply #198 on: December 18, 2024, 03:00:25 am »
V6 is done. I'm going to test a few meters including my LCR, and at least 2 of my DMMs...as soon as I get my DAQ back from being serviced.
"Right now I’m having amnesia and déjà vu at the same time. I think I’ve forgotten this before." - Steven Wright
 

Offline KungFuJoshTopic starter

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Re: LCR Cal Test PCB
« Reply #199 on: December 18, 2024, 03:59:44 am »
A few quick tests to see how it came out...
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