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Metrix MX56C / BK Precision 5390 Multimeter Teardown

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Amarbir[Lynx-India]:
Robomeds ,
      I Have a suggestion When You Make a Review Like This .I Can Let You Know If you Have No Issues .

free_electron:
Jep. These are originally ITT machines. Itt intermetall doesnt exist anymore. They were a large ic maker from germany. The ITT concern made tv's , vcrs and other stuff. They were large in automotive as well. Many upscale german cars from the 80's and 90's had itt chips in em.

Itt invented the digital television. Digit2000 system. The digitized the viadeo and audio in the tuner and the rest was a collection of 40 pin dip ic's on a bus. There was a pal decoder, secsm decoder, teletext chip, nicam chip, main cpu, deflection processor, rgb processor and many more.

Depending on what features you wanted tou just plonked chips on the bus. The software did the rest.
The silicon division was acquired by Nokia in the mid 90's and later merged with the Micronas group. The digit 2000 platform lived on for a while in some micronas chips. Up till a few years ago there was a combo chip that basically had the whole audio/video digital processor in 1 chip. These were used frequently in pc tv tuner cards. When analog tv disappeared micronas folded that business. Micronas still makes specialised automotive chips for sensors. They even have special cpu's(based on 6502 architecture!). They still use the silicon plant in Freiburg Germany that was the ITT intermetall plant.

ITT had a test and measurement division as well. This meter is one of them. They are very good designs. At the time of their relase Fluke was unknown i europe and these were the rolls-royce of the meters. chauvin-arnoux was a large french distributor of test euwipment and components and they rebadged them.

All those components you see in there (melf resistors, caps, trimpots) are made by ITT. they did everything. Even the lcd glass.
ITT knitter still makes switches today. So does ITT cannon.
The rest is gone, spun off.

At their heyday they rivaled Philips in terms of making every single component from wire to resistor to led to chip in house.

ITT still exists and does many things but no longer semiconductors and consumer goods.
ITT is short for internstional telephone and telegraph company. They are a very old company. Pre world war 1 i believe.

Actually the ITT university and career decelopment centers are owned by them.
They still have a large protfolio of components.

Amarbir[Lynx-India]:

--- Quote from: free_electron on July 21, 2013, 06:20:31 am ---Jep. These are originally ITT machines. Itt intermetall doesnt exist anymore. They were a large ic maker from germany. The ITT concern made tv's , vcrs and other stuff. They were large in automotive as well. Many upscale german cars from the 80's and 90's had itt chips in em.

Itt invented the digital television. Digit2000 system. The digitized the viadeo and audio in the tuner and the rest was a collection of 40 pin dip ic's on a bus. There was a pal decoder, secsm decoder, teletext chip, nicam chip, main cpu, deflection processor, rgb processor and many more.

Depending on what features you wanted tou just plonked chips on the bus. The software did the rest.
The silicon division was acquired by Nokia in the mid 90's and later merged with the Micronas group. The digit 2000 platform lived on for a while in some micronas chips. Up till a few years ago there was a combo chip that basically had the whole audio/video digital processor in 1 chip. These were used frequently in pc tv tuner cards. When analog tv disappeared micronas folded that business. Micronas still makes specialised automotive chips for sensors. They even have special cpu's(based on 6502 architecture!). They still use the silicon plant in Freiburg Germany that was the ITT intermetall plant.

ITT had a test and measurement division as well. This meter is one of them. They are very good designs. At the time of their relase Fluke was unknown i europe and these were the rolls-royce of the meters. chauvin-arnoux was a large french distributor of test euwipment and components and they rebadged them.

All those components you see in there (melf resistors, caps, trimpots) are made by ITT. they did everything. Even the lcd glass.
ITT knitter still makes switches today. So does ITT cannon.
The rest is gone, spun off.

At their heyday they rivaled Philips in terms of making every single component from wire to resistor to led to chip in house.

ITT still exists and does many things but no longer semiconductors and consumer goods.
ITT is short for internstional telephone and telegraph company. They are a very old company. Pre world war 1 i believe.

Actually the ITT university and career decelopment centers are owned by them.
They still have a large protfolio of components.

--- End quote ---

Boss ,
      Beautiful Info .I still did not get one thing ? .Someone was making for chauvin or they were making it using stuff from itt ? .As far as i know BK precision ,AEMC And Metrix have these type of multimeters .BTW i still see some little different once on chauvin website  .They made some awesome jaw dropping Analogue multimeters also 

free_electron:
I just looked up itt on wikipedia. You need to read that. Those guys are huge , but virtually unknown to the masses.
They even bought farnsworths tv business! They invented digital phone exchanges, pulse code modulation, fiber optics and all kinds of other stuff.

http://en.wikipedia.org/wiki/ITT_Corporation

I knew the intermetall group well as i was a trainee in 1989 and the two successive years at Nokia in Finland (when i was in highschool i won a contest sponsored by Rotary. last-year students(18 years) from many schools had to make a practical project. I had made a satellite receiver based on a tuner from nokia salcomp(the metal can) , a 8051 ah basic and a rgb decoder TDA4550 i believe.. It could point the antenna and had an infrared remote control. I won first prize, which was 2 months as an intern during summer holidays in a company of you choice. I picked Nokia in finland. I spent three summers there. I was in Kemijarvi , just above the polar circle. 24 hour daylight). As an 18 year old i was tinkering with 40Ghz spectrum analyzers... Building digital satellite receivers (D2MAC )...

 When they just began designing with the digit2000 chips. A few years later Nokia acquired that group and fused it with their micronas group. They are today still in freiburg, germany where intermetall began.

free_electron:
Chauvin rebadged the itt meters. Chauvin doesnt make anything. They buy in bulk , specify color and slap their name on it.

ITT metrix was rhe test and measurment division of ITT. That group was in france. The chips came from ITT intermetall in Freiburg, Germany. All other components you see came from various ITT divisions all over the world.  My estimate is that 95% of the parts in that meter were made by ITT divisions. Those guys did everything.

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