Products > Test Equipment
History of Tachikawa (TMK)
Bud:
Ok so how about a story with a IBM office products repair technician coming to the lady's house to fix her typewryter, then forgetting the meter there as he leaves the house.
joeqsmith:
I'm sure you could make up all sorts of stories. I doubt an IBM service person would make a house call to repair a personal typewriter. It would make more sense they would send the typewrite to a repair shop.
I was able to find out a little more about the lady who owned the home where this meter was found. She apparently owned several properties in the area and would rent them out. I also understand she was a hoarder. It would make sense that the meter was owned by someone renting from her and it was left behind where she added it to her collection. That's the story I am going with anyway.
fanOfeeDIY:
--- Quote from: joeqsmith on October 21, 2017, 06:04:47 pm ---What I find VERY interesting with your dads old meter is that the resistor circled on yours is attached to the meter (-). If you look at mine, you will see it also attached to this same location but has some black sleeve over it. This resistor used to go to the fuse holder but I added the sleeve and changed how it was wired.
On your meter, when you remove the fuse, can the meter read both current and voltage resistance? I wonder if they actually changed the design like I show in later serial numbers.
Wrong mode. Actually, it would be good to how the fuse effects all of the modes on your dads.
--- End quote ---
Sorry for the late response. I was busy with my hobby project making a flight controller of a drone. :)
I tried removing the fuse from my meter and I was able to measure voltage and current but not the resistance.
And I searched for the size of AA battery standard in Japan (it is called JIS) and found that the minimum length was 49mm and maximum was 50.5mm, so some batteries were only targeting 49mm. The 1.5mm difference is a lot for only 50mm battery.
I heard that now all are 50.5mm in Japan.
And this seemed to cause some batteries do not fit in the battery case. :)
fanOfeeDIY:
Hi,
Another point that I found today when I was testing the meter, the accuracy for the resistance and voltage were very good but not so well on the current range any more.
Well it must be made in 70' and not
And the leads I have is probably not the original one. It looks like I made them more than 30 years ago with 2mm banana jack with slim pvc cable with alligator clips.
I think I wanted to have the alligator clip to my meter.
joeqsmith:
Thank you for taking the time to check. I would have bet on it protecting the current input. It's strange how they would change how it was wired but maintain the same functionality. I wonder if this change was a labor savings.
I saw another one that was also newer than mine. On mine, there is a white plastic part that bolts in behind the clear lens for the movement. On this meter, they were no longer making this plastic part but instead using paint. I assume this was for cost as well.
I suspect that the alligator clips on mine are also not original. The banana connectors and wire appear correct. Everyone I have seen for sale appear to have the leads altered.
This one showed up with an older SN but the leads appear to be newer.
https://www.ebay.com/itm/Vintage-Tachikawa-Model-200C-IBM-Voltage-Ohm-Meter-Works-great/322866105225?hash=item4b2c51cb89:g:e1IAAOSwPAxZ~4GV
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