Products > Test Equipment
History of Tachikawa (TMK)
fanOfeeDIY:
--- Quote from: joeqsmith on November 08, 2017, 02:10:24 pm ---
--- Quote from: fanOfeeDIY on November 08, 2017, 11:32:26 am ---I am not completely understanding how the rotary switch work on the schematic (model AMK-200, you have posted on this thread), however the fuse seems to work for voltage and current but not for resistance.
--- End quote ---
In that schematic, the fuse is in-line with everything. I am not sure how much protection it would really provide (for the meter) but it's better than nothing. I don't like meters that will not display the voltage with a blown fuse.
In the attached, I have marked the path for the 250mA setting.
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Thank you for detail diagram with marking. I completely understand how the rotary switch would be written in the schematics now.
I was playing with this meter and I realized that it is nice to be able to use the own meter for battery checking and the fuse, and this analog tester is able to do it. :)
Tepe:
The insides of my TMK model 200:
The outside and original box:
(Edited to add picture of the outside of the meter)
joeqsmith:
The closest schematic I found to my 200C was for the TP-5SN. I used it as a starting point. Keep in mind, there may be mistakes.
--- Quote from: Tepe on November 12, 2017, 02:32:55 pm ---The insides of my TMK model 200:
..
The outside and original box:
--- End quote ---
Very nice. I had wondered if these had a fuse in them or not.
Tepe:
--- Quote from: joeqsmith on November 12, 2017, 05:59:43 pm ---Very nice. I had wondered if these had a fuse in them or not.
--- End quote ---
Here's a photo of the schematics part of the model 200 instructions.
As it says, it came with a spare fuse. The tape residue seen in the picture of the insides, is where the spare was placed :)
joeqsmith:
Thanks for taking the time to provide that picture. There is very little written information I can find on the net about these meters and every little bit helps.
It's interesting that your meter has the fuse in series with the common to provide some protecting in every function. It must have been around the time that they started thinking that they may not want disable the voltage measurements. Then again, I have seen a few modern meters that do this same thing.
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