Trasmille 8081 on ebay - Page 1
Forum section: electronics / general

author: mimmus78
author_rank: Unknown
timestamp: July 06, 2019, 06:52:56 am
content: https://rover.ebay.com/rover/0/0/0?mpre=https%3A%2F%2Fwww.ebay.com%2Fulk%2Fitm%2F293136860178Hope someone here will get it ... and hoping to see teardown ;-)Inviato dal mio ONEPLUS A5010 utilizzando Tapatalk

author: Kleinstein
author_rank: Super Contributor
timestamp: July 06, 2019, 07:02:14 am
content: It is a broken meter, and it could get very tricky to repair if special parts (e.g. custom resistor arrays, hybrids) are used. So there is quite some risk involved.

author: TheSteve
author_rank: Unknown
timestamp: July 06, 2019, 07:17:17 am
content: Looks to be overpriced already - should be fun though, 55 watchers at the moment.

author: TiN
author_rank: Super Contributor
timestamp: July 06, 2019, 07:42:56 am
content: I was very unimpressed by few INL tests I had chance to do on Transmille, so zero interest to it from our camp.Internal design is also very.... hobby-style, to say in kind words...

author: jaromir
author_rank: Unknown
timestamp: July 06, 2019, 09:56:10 am
content: There seems to be 4 (four!) Microchip MCUs in the digital part, one of them being in breakout board from Mikroelektronika. Very intriguing. I wonder what lead them to those design decisions.TiN: don't you happen to have more detailed photos of the digital part, please? I'm interested what is the MCU on the breakout board.

author: iMo
author_rank: Super Contributor
timestamp: July 06, 2019, 10:11:33 am
content: @jaromir: my bet is dspic33 or pic24.. Btw the breakout boards from Mikroelektronika were well designed (especially the decoupling) so I do understand the choice (I still use and have handy a few for pic32MX).. It creates a certain flexibility as well - as the breakout boards for the pic33/24/32 are pin compatible, afaik.

author: jaromir
author_rank: Unknown
timestamp: July 06, 2019, 10:16:23 am
content: Yes, definitely. Silkscreen on the breakout confirms this suspicion, too.Majority of 16- and 32- bit PICs in TQFP64 share the same pinout, so I'm curious which one they chose.

author: iMo
author_rank: Super Contributor
timestamp: July 06, 2019, 10:35:12 am
content: For $100-$200 a good playground for writing your own pic code

author: Kosmic
author_rank: Super Contributor
timestamp: July 06, 2019, 01:29:56 pm
content: It's in relatively good shape for something coming from Israel. I'm wondering if everything is melted together inside, or something horrible like that ?

author: Kleinstein
author_rank: Super Contributor
timestamp: July 06, 2019, 01:52:15 pm
content: Though coming from Israel it may be civilian unit - not something thrown out by the military. Normally such meter are more like used in a rather clean lab - so after initial use it should look good from the outside. If powering up and than showing ADC error - is pointing more to a subtile problem (e.g. like the 3458 ADC problem) that may be fixable, but may need hard to get parts, like a programmed CPLD/PIC. It does not sound like a problem from gross input overload.

author: TiN
author_rank: Super Contributor
timestamp: July 06, 2019, 05:25:36 pm
content: Quote from: jaromir on July 06, 2019, 09:56:10 amI never had a meter in person, I believe photos are from our chinese volt-nut folks, but I don't remember who exactly (sorry).One I tested was remotely via internet (I've just ran my python apps, controlling instruments (5720A and two 3458A as INL reference)).

author: MadTux
author_rank: Frequent Contributor
timestamp: July 06, 2019, 06:20:44 pm
content: Quote from: imo on July 06, 2019, 10:35:12 amCertainly nice pic devboard from hell, as soon as one of them decides to crap out and you have to code a replacement, while understanding everything and every hackjob the designers did when building it.

author: saturnin
author_rank: Regular Contributor
timestamp: July 06, 2019, 06:30:41 pm
content: FYI: Evaluation of the TRANSMILLE mod. 8081 high precision digital multimeter by the INRIM calibration laboratory:https://www.researchgate.net/publication/305405082_Evaluation_of_the_TRANSMILLE_mod_8081_high_precision_digital_multimeter_by_the_INRIM_calibration_laboratory_of_multifunction_electrical_instruments

author: TiN
author_rank: Super Contributor
timestamp: July 06, 2019, 07:01:10 pm
content: Which shows rather poor results for precision 8.5d meter as well.Anyhow, I hope we may hear from the new owner of the glorious device soon enough.