bbs.1ppm.cn Binding Post - Page 1
Forum section: electronics / general

author: Kosmic
author_rank: Super Contributor
timestamp: June 13, 2025, 06:28:51 pm
content: I recently bought some binding posts from bbs.1ppm.cn and decided to test them a little bit and compare them to some other binding post I had at hands.The binding post can be found herehttps://www.goofish.com/item?spm=a21ybx.personal.feeds.1.20446ac2YGufBO&id=675273563090&categoryId=50025261Thanks to zlymex for having provided the linkMy understanding is that goofish.com is a little bit like Facebook Marketplace and you can't really buy directly from outside China. One can use the services of an agent though (ex cssbuy.com).Anyhow, I got the gold plated PM3770 compatible binding post.From the datasheet, the binding post is copper and insulator are supposed to be ABS. I’m not sure about the white washer though. Feel like PTFE but could be something else. Gold plating is 2u thick.I'll compare bbs.1ppm.cn binding post to a Superior Electric BP31, a ESI equipment binding post and a Pomona 3770.

author: Kosmic
author_rank: Super Contributor
timestamp: June 13, 2025, 06:30:44 pm
content: I’ll start by testing leakage and compare the results to some other binding posts.Test SetupMeasurement was done with an Advantest R8340 at 100V in a shielded aluminum box.Each binding post was cleaned in an ultrasonic cleaner with isopropyl alcohol. They were then mounted on a FR4 board with copper on one side.Voltage was injected on the binding post via a banana connector and leakage was measured from the FR4 board.Resultsbbs.1ppm.cn binding post:59.9 Tohms or 1.67 pAPomona 3770:51.8 Tohms or 1.95 pASuperior Electric BP31:94.3 Tohms or 1.08 pAESI binding post:110 Tohms or 0.95 pA

author: Kosmic
author_rank: Super Contributor
timestamp: June 13, 2025, 06:31:38 pm
content: Reserved for thermal EMF test results (as soon as I have some free time to do the setup)

author: PascalNE
author_rank: Regular Contributor
timestamp: June 13, 2025, 09:15:22 pm
content: These are great tests thanks.I'll add your results to my topic on these things (crediting this great post of course)If you are interested in testing more maybe I can send you them?

author: TimFox
author_rank: Super Contributor
timestamp: June 13, 2025, 09:45:36 pm
content: Out of curiosity, for these extremely high resistance values (ca. 50 to 100 T\$\Omega\$) did you see any sign of nonlinearity?Maybe compare the current at 50 and 100 V?

author: zlymex
author_rank: Frequent Contributor
timestamp: June 14, 2025, 01:00:36 am
content: Great try!I also planed to test the thermal emf of my binding posts.Top left test fixture including resistor heater array and a fan.Top right is the power source for the above.Bottom left is my DIY nanoV amp.Bottom right is the data collector and the power supply.

author: coppercone2
author_rank: Super Contributor
timestamp: June 14, 2025, 01:15:16 am
content: Quote from: TimFox on June 13, 2025, 09:45:36 pm

author: PascalNE
author_rank: Regular Contributor
timestamp: June 14, 2025, 01:54:39 am
content: Quote from: zlymex on June 14, 2025, 01:00:36 amWhat design are you using for the nano volt amplifier? Is it documented anywhere?Im interested in making similar measurements but there’s a lot of different designs out there.

author: Kosmic
author_rank: Super Contributor
timestamp: June 14, 2025, 02:45:40 am
content: Quote from: TimFox on June 13, 2025, 09:45:36 pmI'll try and let you know.

author: zlymex
author_rank: Frequent Contributor
timestamp: June 14, 2025, 05:52:00 am
content: Quote from: PascalNE on June 14, 2025, 01:54:39 amI have not write anything about the nano amp yet. I just use a LT1028 for test and suffers 1/f noise problem. I plan to use ADA4528-2 similar to mynoise meter.

author: Simmed
author_rank: Frequent Contributor
timestamp: June 14, 2025, 07:28:09 am
content: please do 1 test with additional 1 2 or 3 PTFE washeri remember in 1 thread heresomeone else already did tested and it works well

author: coppercone2
author_rank: Super Contributor
timestamp: June 14, 2025, 08:15:46 am
content: and a bake out would be interesting. I wonder if there can be moisture in the part. Or a soak followed by a bake out. Resistance to humidity absorption .I thought readings might be influenced depending on the shipping method and humidity/air pressure. Like airplane = low pressure for cargo I think. Boat = massive humidity exposure and possibly salt exposure possibly from sea water splashing around etc (as hard as they try its always possible something gets splashed, leaking container and so on.Low pressure can dehydrate stuff I think. Like mountain potatoes

author: tuoni
author_rank: Newbie
timestamp: June 14, 2025, 12:57:57 pm
content: Hello everyone, the bbs.1ppm.cn mentioned above is me. I sincerely thank everyone for their trust. I happened to use the HP34420A today to measure the thermoelectric potential. I am sharing pictures for your reference, and I will answer any questions you may have. My English is not good, so all content has been sent after being translated by software. Please forgive me!Because a metal shielding box could not be found temporarily, a BZ3 resistor was used as a substitute.

author: coppercone2
author_rank: Super Contributor
timestamp: June 14, 2025, 06:26:05 pm
content: this might interest you for test setupshttps://www.eevblog.com/forum/metrology/thermal-emf-for-soldered-components/msg3591385/#msg3591385(read the entire end of thread though, its just a start)

author: tatel
author_rank: Frequent Contributor
timestamp: June 14, 2025, 08:29:12 pm
content: Quote from: tuoni on June 14, 2025, 12:57:57 pmYou're welcomeI bought a bunch of spade lugs and some binding posts/adapters from you, through@PascalNE. They are on the way from UK to Spain.I would like to ask about wires used with these lugs and about crimping. I was expecting to use some kind of stranded wire and wonder about the crimping tool that could be used.Your spade lugs look good enough to be worth some testing: that's the reason I wanted them. However it looks they are designed for much thicker wire than the one in your photographs, so no wonder some solder has been used.But I would like just to crimp them, I think that would be better both for low thermal EMF and connection thoughness. Perhaps some thicker, stranded wire will have so much thermal mass to make soldering preferable? I was thinking, thermal mass wouldn't be so important if both wire and spade lug are high purity copper?

author: PascalNE
author_rank: Regular Contributor
timestamp: June 14, 2025, 08:55:08 pm
content: From my experience I have been able to make secure connections using a normal cheap crimping toolhttps://www.aliexpress.com/item/1005006847404824.html(without soldering) onto small 22AWG wire.I find the trick is to basically press down one side of the connector over the wire and then fold the other over.It should also be a little easier with yours since they are 0.8mm not 1mm.Although this can be a little fiddly and doesn't always look the prettiest, functionally it is fine.I would suggest to bbs.1ppm.cn in future using ones more designed for small wire (some of nimolvs ones were a bit better for this)

author: Kosmic
author_rank: Super Contributor
timestamp: June 15, 2025, 01:08:44 am
content: Quote from: Simmed on June 14, 2025, 07:28:09 amI did something like that in my capacitor box. The problem with this aproach is that if you put a washer on each side you endup with mechanical issues. PTFE being a little bit slippery it's hard to secure the binding post correctly on the front panel. This is why most binding posts have some kind of notch in the insulator to prevent rotation.

author: Kosmic
author_rank: Super Contributor
timestamp: June 15, 2025, 01:14:57 am
content: Quote from: coppercone2 on June 14, 2025, 08:15:46 amI wanted to try something like that (soaking) on PLA and PETG filaments and evaluate if moisture absorbtion impact isolation. I might throw in the plastic parts of tuoni's binding post in the test and see how they are impacted by moistures.

author: Kosmic
author_rank: Super Contributor
timestamp: June 15, 2025, 01:19:29 am
content: Quote from: tuoni on June 14, 2025, 12:57:57 pmThanks tuoni for making those binding posts available to usI'm planning to use them on 2 LTZ1000 references I'm slowly building. They will fit perfectly.

author: tuoni
author_rank: Newbie
timestamp: June 15, 2025, 03:13:51 am
content: I use 13AWG wire. After processing it with a hydraulic pliers, I add solder. For thinner wires, such as network cables, I use a locking pliers to press them tightly and then add solder.

author: coppercone2
author_rank: Super Contributor
timestamp: June 15, 2025, 03:17:43 am
content: Quote from: Kosmic on June 15, 2025, 01:14:57 amIts the most important part would be to find out what it does 6 months after being installed in equipment in sub par conditions, not what it says out of the box

author: Simmed
author_rank: Frequent Contributor
timestamp: June 15, 2025, 05:37:23 pm
content: Quote from: Kosmic on June 15, 2025, 01:14:57 amjust a stray ideaif bulk PLA is somehow conductive ? 1pA ? due to moisturethen what if the knob is not printed as a full solid but hollow ?would a hollow knob be better ?or there some undulations on the surface to increase creepage ?

author: Alex Nikitin
author_rank: Super Contributor
timestamp: June 15, 2025, 09:19:30 pm
content: Quote from: Simmed on June 14, 2025, 07:28:09 amThis thread?CheersAlex

author: TimFox
author_rank: Super Contributor
timestamp: June 15, 2025, 10:25:40 pm
content: Teflon washers are also available as shoulder washers for insulation purposes, such ashttps://www.mcmaster.com/93835A370/

author: Simmed
author_rank: Frequent Contributor
timestamp: June 16, 2025, 07:05:33 am
content: Quote from: Alex Nikitin on June 15, 2025, 09:19:30 pmah yes the fAQuote

author: TERRA Operative
author_rank: Super Contributor
timestamp: June 16, 2025, 10:15:54 am
content: Quote from: tuoni on June 14, 2025, 12:57:57 pmIs there an easy way we can purchase from you if we are outside China? Maybe Aliexpress or similar?

author: Kosmic
author_rank: Super Contributor
timestamp: June 16, 2025, 02:10:39 pm
content: Quote from: Simmed on June 16, 2025, 07:05:33 amBeing in Polystyrene 51Z122-000 would definitely improve isolation. I was looking at the footprint and it probably also compatible with 3770 binding post. Unfortunately it's not readily available in North America

author: tuoni
author_rank: Newbie
timestamp: June 17, 2025, 04:53:20 am
content: I'm not quite clear about the regulations regarding the sale to members within the forum, so it's not convenient to elaborate. Generally speaking, purchasing is not a problem. The issue is to find a low - cost shipping channel.

author: TERRA Operative
author_rank: Super Contributor
timestamp: June 17, 2025, 05:17:03 am
content: Individual sellers are ok.As long as you aren't a big commercial company or making lots of 'For Sale' posts, it's ok to sell some stuff on these forums.

author: tuoni
author_rank: Newbie
timestamp: June 18, 2025, 01:24:36 am
content: You can purchase in the way of Taobao, Alibaba or eBay.Send a DIY benchmark acquisition trend chart for DM7275 testing for your reference.

author: Kosmic
author_rank: Super Contributor
timestamp: June 20, 2025, 12:59:13 am
content: Quote from: TimFox on June 13, 2025, 09:45:36 pmSo I cleaned the binding posts again before measurement and this time I isolated the metal box from the case of the R8340 (was previously sitting directly on top), and now I got better resultsI guess I did a better job at cleaning the binding posts. In any case, I ran a sanity check with a 1G\$\Omega\$ and 1T\$\Omega\$ resistors and the measurement setup seem to be fine.Here's the numbers:Pomona 3770:0.95pA at 100V1.54pA at 500V2.03pA at 1000Vbbs.1ppm.cn Binding Post:0.80pA at 100V0.87pA at 500V1pA at 1000VP.S: at those resistance level below 100V I can't detect anything reliably on the R8340.

author: Hedrix
author_rank: Contributor
timestamp: June 25, 2025, 10:04:37 am
content: One question about the unplated version of the binding posts, in case anyone can help me out(https://www.goofish.com/item?id=711428863560&categoryId=125958001):In the pictures, there are two different binding posts labeled "AD" and "PM" with different plastic parts -- are those actually two different ones that can be ordered (CSSbuy comment box?), or is it sort of random what you get?

author: PascalNE
author_rank: Regular Contributor
timestamp: June 25, 2025, 01:20:03 pm
content: The only difference between the “AD” and “PM” ones as for as I know is the mounting part which you can see in the drawing every other part is the same and compatible.Im sure if you put it in the notes section when you order you will get what you ask for I would think