Products > Test Equipment
Bench LCR Recommendations?
mawyatt:
--- Quote from: KungFuJosh on May 29, 2023, 10:09:16 pm ---Good news and bad news.
The good: The seller shipped fast with DHL express, I received it today.
The bad news: the unit appears to be used.
The other bad news: the reason these aren't commonly sold in the US is it appears they require 220V power. That wasn't listed in the ad, and the pics of the unit weren't clear enough to see that.
No snarky RTFM comments please. 🙄
--- End quote ---
Interesting about only 220VAC, ours was requested for 120VAC, assured it would be so, and works fine on such and came with standard US 120V plug. You should ask Tonghui about this, maybe there's a jumper inside to set to 120VAC?
Good luck with yours,
Best,
KungFuJosh:
Thanks guys, hopefully you're right. Worst case if I get stuck with it, I could hopefully find a replacement transformer.
The seller thinks it works with 120V, but the back panel and manual don't agree.
It's possible there's a dual voltage transformer inside, but there's also a "calibration void if seal is broken" sticker on the back panel of the enclosure.
The fact that they lied about it being new is annoying too.
mawyatt:
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!!
The special transformer has 4 wires from the primary, red, blue, black, and yellow/green (ground/shield). One shows 110VAC, the other 220VAC and in series with the other.
Note the short red wire jumper in the white connector with the red and blue wires that go to the AC input & fuse connector, this likely is the jumper that sets up for 110VAC or 220VAC operation.
If you open yours, take a look and see if the red jumper is in place? You could buzz out the connections to see if the assessment above is correct. Does the seller know anything regarding this mains setup?
Anyway, I wouldn't do anything before contacting Tonghui, and does look like you'll be able to configure for 110VAC use. However, please don't do anything without some conformation from Tonghui as we certainly don't want a fried lab LCR meter on our hands :-[
Best,
mawyatt:
Another view.
Best,
KungFuJosh:
Thank you. Assuming it has the same transformer and connections, I would disconnect the clips and verify the output voltage before reconnecting them to the board. However, I'm not in a rush to pull the back panel and cut the sticker yet. I want the seller to resolve the used vs. new issue also.
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