UNI-T  UT139C MULTIMETER - Page 1
Forum section: electronics / testgear

author: jobog
author_rank: Regular Contributor
timestamp: April 29, 2015, 03:51:44 am
content: Just received the UT139C multimeter I ordered and it appears to be a pretty decent meter. The continuity beeper is really slow but it seems to be well built.When I took the meter out of the box there was something rattling around inside the cardboard box. What I found was a small, about 1/8", steel ball bearing. Looks like something that would be used for the detente in a rotary switch. The switch on my meter seems to work just fine so I don't think it came out of my meter. Don't know why a piece like this would be anywhere near the packaging operation for these meters so I must assume that UNI-T is just providing a spare ball in case I take my meter apart and lose one.Always disconcerting when you find something loose in a box that could have come from the product you just bought.

author: miguelvp
author_rank: Super Contributor
timestamp: April 29, 2015, 03:59:23 am
content: I have an old GB GDT-200A piece of crap and one of the bearings kept on getting free. I did attempt many times but not really trying really hard since with just one bearing is was working fine.Last time I did take it apart I finally fixed it and there is no rattling anymore. As far as I recall, that bearing has been getting out of it's post since I got that meter at a Home Depot a long time ago.I do have a UT71B but those don't use ball bearings.Anyways, I don't think they gave you an extra bearing, I think it probably came loose and it's looking for a place to nest and create a short.

author: retiredcaps
author_rank: Super Contributor
timestamp: April 30, 2015, 05:46:55 am
content: Quote from: jobog on April 29, 2015, 03:51:44 amI wonder if you have a defective one. The youtube video by eevblog member, electronupdate,at around 7:19m shows the continuity speed and it seems fairly fast.Are you comparing the UT139C continuity beeper to another faster meter like a Fluke 87V or something like that?

author: jobog
author_rank: Regular Contributor
timestamp: May 01, 2015, 12:59:12 am
content: Quote from: retiredcaps on April 30, 2015, 05:46:55 amI would say my meter's response is comparable to the one in the review so it's not defective. I was comparing it to my Radio Shack meter which is a little faster than this one.

author: Martini
author_rank: Regular Contributor
timestamp: September 30, 2025, 11:58:25 am
content: I blew my 10A fuse (because I'm an idiot).I'm having a hard time finding a replacement in the right dimensionFound these :https://fr.aliexpress.com/item/4001258904531.htmlBut over 6 bucks for ONE fuse seems pretty steep. Any advice?

author: Kleinstein
author_rank: Super Contributor
timestamp: September 30, 2025, 12:56:52 pm
content: The 10 A fuse have already saved the shunt / meter. DMM fuse are made for high maximum voltage and breaking capacity. The price is about reasonable, but aliexpress may not be the right souce for a fuse, that can be safety relevant. Aliexpress is a known good source for fake parts.In europe one can get a similar / slightly lower price at TME.EU , but with shipping on top.

author: indman
author_rank: Super Contributor
timestamp: September 30, 2025, 04:23:02 pm
content: Quote from: Martini on September 30, 2025, 11:58:25 amBuy these or these 5 pieces and try them out, I think they will work just as well as the more expensive brands. If my links don't open for you, search for these samples using the name I've attached to the right of the linkhttps://aliexpress.ru/item/1005005174918292.html?filters=&sku_id=12000031970661424- BLUSUNSOLAR 10Ahttps://aliexpress.ru/item/1005007087597022.html?sku_id=12000039356340251&spm=a2g2w.productlist.search_results.0.78be6198CrVaLb- SIBA 10A

author: Martini
author_rank: Regular Contributor
timestamp: September 30, 2025, 04:44:16 pm
content: Blusunsolar are way too big (10x38 mm, I need 6.3x25.4 mm)SIBA don't mention the sizeQuote from: Kleinstein on September 30, 2025, 12:56:52 pmAny reliable source in Europe for fast acting ceramic fuses?I avoid Temu, I trust it even less than AliExpress

author: indman
author_rank: Super Contributor
timestamp: September 30, 2025, 05:17:28 pm
content: Quote from: Martini on September 30, 2025, 04:44:16 pm6.3x25.4 such fuses are hard to find on 1000V, only at UNI-T

author: Martini
author_rank: Regular Contributor
timestamp: September 30, 2025, 08:38:39 pm
content: I only need 600V. I read that many TDC fuses were 6.3x25.4 (1/4" x 1", often used in British plugs)....but yeah, I'm having a really hard time finding some. 32 mm is WAY more common

author: stj
author_rank: Super Contributor
timestamp: October 02, 2025, 11:37:42 am
content: cant you move the fuseclips apart for 32mm?the UT61e has multiple holes in the pcb for different fuse sizesupdate:you can move the fuse clips for 32mmnotice the extra hole on the right