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Bench LCR Recommendations?

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KungFuJosh:
Does anybody know if the TH2830 has a usage stats thing in the menu somewhere? Like how many hours it has been used, or how many times it has been turned on?

KungFuJosh:
This appears simpler than expected.



I buzzed out the connections, and they are as follows:

2A to 3A
3B to 4B

1A to 1B
2A to 5B
3A to 5B
4A to 6B

C shows reference voltages:
C1 and C4 = 12VAC
C6 and C7 = 7VAC

Comparing Mike's jumper wire, it's as simple as moving the jumper wire on mine from B6 to B5 (my jumper was connecting B4 to B6, Mike's is B4 to B5).

Thanks,
Josh

KungFuJosh:

--- Quote from: mawyatt on May 30, 2023, 12:42:39 am ---Ok, couldn't resist to help out. Took the TH2830 out of series and took the cover off (easy 3 screws), no Cal label to deal with!!

--- End quote ---

THANK YOU!!!

Swapping the jumper wire (see above) did the trick. I tested the secondaries for the marked voltage, and pins 6 and 7 had 8.9377VAC unloaded, and pins 1 and 4 showed 2.6634VAC. Maybe it really says 1.2VAC instead of 12VAC, or maybe it's 12VAC when actually powered on. 🤷

This test showed that the transformer is pushing that voltage to pins 6 and 7 even when the unit is powered off. I'll be shutting this off with my surge protector when my bench isn't in use.

Anyway, I reconnected the PT secondary to the PCB, and it powered up. Thankfully it didn't take too much effort to change it to English. Now to learn how to use it. 🤣

Thanks,
Josh

KungFuJosh:
Okay, first of all, the fixtures are legit. They're as heavy as some of my meters lol.

I calibrated with the TH26048A fixture, and tested a cap:

UKZ2A220MPM 22uF 100V electrolytic cap.

100Hz:
TH2830 said: 20.0353uF, ESR=2.97802 ohm
DE5000 said: 20.06uF, ESR=2.9 ohm
Shannon tweezers said: 19.97uF, ESR=2.7 ohm

The reading on the TH2830 isn't super stable. Is that normal? It's only the last digits shifting.

What are your firmware versions? Mine says v1.0 at startup. I'm guessing that's not awesome?

Thanks,
Josh

mawyatt:
Nice, good news :-+

Ours is also V 1.00, so no worries!! It's also stable, we exclusively use the "Slow" speed and Avg 16 (see Measure Setup Menu) since we're not a production line.

Also turn Vm/Im ON (Setup Menu) so you can "see" the DUT measurement Voltage and Current. Very important feature that few folks utilize, as this helps the knowledgable user regarding the quality of the measurement at hand, with a very low DUT voltage or low current, one should question the displayed result!!

Please, please spend some serious time understanding how these bench lab grade quality LCR meters operate, and how they compute the various displayed parameters from the DUT voltage and current (vectors) measurements, this knowledge is important if one expects to utilize these fine instruments to their fullest extent!!

Now get yourself some quality caps, ceramic C0G/NP0 only, film types like Polystyrene or Polypropylene (not mylar), and some mica types. These will come in handy to verify that something hasn't gone astray with future measurements if you make some quality early measurements and keep a record of such, when something doesn't seem right then check with a known good capacitor as a sanity check.

Here's a good source in the US we've used, lots of surplus selections on all sorts of capacitors and other items.

https://www.surplussales.com/GuestTools/shoppingcart.html

Also consider building the DC Bias adapter, details here.

https://www.eevblog.com/forum/projects/bias-network-for-lcr-meter/

And of course sooner to later (likely sooner) you'll want to employ your new lab grade bench LCR meter for SMD devices (you can use the DC Bias adapter with this also), so get yourself one of these and modify as we've shown.

https://www.eevblog.com/forum/testgear/cheap-smd-lcr-fixture-the-good-bad-and-ugly!/msg4539458/#msg4539458

Then you'll likely want the nice plots you've seen from these bench type LCR meters, which you can probably buy the software from somewhere (expensive from Tonghui ?), or just purchase the crude Python code versions we created (maybe spruce it up a little!!), this only cost a brew  ;)

https://www.eevblog.com/forum/testgear/lcr-meter-plot-software/msg4774100/#msg4774100


Edit: Forgot to mention, check out the frequency resolution it's not just 37 points as indicated in the manual. Try this, enter 12345 and Hz using the keypad, and note the display it's 12.345KHz, or 987.654Hz, or 31415Hz! It's DDS driven, nice ;D


Have fun :-+

Best,


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