MPX(MRH) resistors - Page 1
Forum section: electronics / general

author: shodan@micron
author_rank: Contributor
timestamp: April 08, 2021, 03:47:50 am
content: void

author: bsw_m
author_rank: Frequent Contributor
timestamp: June 28, 2021, 12:08:19 am
content: Microwire in glass insulation. Photos in bright and dark field. Sorry for low quality of photo, i do this by my phone trough eyepiece. Resistor is 100KOhm MRH.

author: Vgkid
author_rank: Super Contributor
timestamp: June 28, 2021, 10:00:14 am
content: Thanks for posting that. Reminds me of how glass fibers are made(fiber optics)

author: manganin
author_rank: Regular Contributor
timestamp: June 29, 2021, 06:43:12 am
content: Quote from: shodan@micron on April 08, 2021, 03:47:50 amCompany out of business? What happened and when?

author: daqq
author_rank: Super Contributor
timestamp: June 29, 2021, 01:10:00 pm
content: Sorry for offtopic, the idea of glass coated microwiresthat actually bendis just so cool I had to look it up. There are companies that make them and one has an interesting video of how they are actually made:https://www.rvmagnetics.com/productionThat's so cool!

author: daqq
author_rank: Super Contributor
timestamp: June 30, 2021, 06:03:02 am
content: Question: Would a wire coated in glass not have insanely low current leakage? Like better than PTFE of the same size?

author: Kleinstein
author_rank: Super Contributor
timestamp: June 30, 2021, 06:19:30 am
content: Glass is not such a great insulator. PTFE tends to have better volume values, though it is hard to measure and compare. It still depends on the composition of the glass - there are many different glasses. PTFE can also vary, depending on chain lenght and density.An interesting point with the glass insulation is, that there is a direct interface and thus possibly low triboelectric effect. However the very thin wire may not be that great for longer distance anyway.On the downside, some glasses react to humidity, especially as such a thin layer, and there may this be some slow humidity effect. So it is a good thing the resistors have the extra hermetic seal.

author: 3roomlab
author_rank: Frequent Contributor
timestamp: June 30, 2021, 06:35:06 am
content: any idea of past/current data about its drift per year character?

author: bsw_m
author_rank: Frequent Contributor
timestamp: June 30, 2021, 09:16:23 am
content: Quote from: 3roomlab on June 30, 2021, 06:35:06 amI'm don't have data for one year stability (drift). But may be these info helps:1. I have some boxes with 100MΩ MRH resistor in NOS condition. This resistors was manufactured in 1992y. Tolerance for this resistors is 0.1%. But my resistors have an actual error in the range of -0.04 ... -0.06%, this is after 29years of mfg. dateBut at the same time, I want to draw your attention to the fact that the official datasheet for these resistors speaks of a maximum resistance of 20MΩ, while my resistors have a nominal value of 100MΩ, perhaps they were made by special request. I can also say that I have a certain number of MPX resistors for non-standard values (300MΩ ... 500MΩ), they all have an error of <0.1%2. In contrast, I can say that I had heard a lot of feedback that MPX Series resistors in fairly high quantities drifted far beyond its specifications.