HISTORY:
Imported from an international research laboratory (by ship!) as the equipment was being disposed of due to the previous establishment upgrading their equipment in the early 2000's. This is yet another very nice item of industrial equipment which I have decided will become an organ donor.
It is the MATSUNGAWA Frequency Converter, intended for laboratory use and providing up to 240V AC at a user variable frequency. Not only that, the AC voltage output could be varied across a wide range AND the user could set current limiting. I actually fired this gear up and it was working great but oh dear! What to do with it? I did offer this equipment as a complete unit "elsewhere" for a while but there was no interest at all so I pondered over what to do with this equipment (to keep or not to keep) but it had a few things going against it.
As a complete unit it was EXTREMELY HEAVY, over 50Kg, which means that my arms are now 30cm longer from lugging this beast around the workshops! ... but more seriously, shipping would have been difficult to ensure safe travel AND very expensive. It also had other minor cosmetic issues because it is not easy moving such a monster around so it suffered scrape marks on various places of the all steel casing.
So, the "donor operation" has begun and here is an interesting component .... a current transformer
It is also worthwhile to keep in mind that all of the AC "wound" components (chokes, current transformers, AC step up or down transformers for example) were designed for use across a wide FREQUENCY range, not just 50 ~ 60Hz as the equipment was capable of changing the line output frequency from 40Hz right up to 1Khz
The component manufacturer is Sugimoto Denki Co. Ltd, Japan.
SUGIMOTO DENKI Co. Ltd (Japan) - Current Transformer
Made in Japan
Ex Matsungawa test equipment (AC Frequency Converter)
Circa late 1990's
Ferrous E core
Ratio 375/1
Maximum line current 7.5 Amp
20mA
Rated 2VA maximum
Designed for use up to 250V AC
50/60Hz
Visually very "old school" but the CT performs it's purpose very well.
4x screw terminals to the top plate, which appears to be a 5mm thick Brown perspex type of material
K & L are the line terminals
k & z are the low current secondary terminals
All identification/technical details are printed on the top plate metallic label
Part # CT SS
DIMENSIONS:
Top side, the current transformer measures 72mm width x 60mm depth x 85mm height (including the screw terminals)
Base is 68mm x 50mm
4x mounting holes
WEIGHT:
600g
TESTING:
Fully functioning while installed in the equipment but "for fun" I made a quick test setup after I had extracted the CT, using 100V AC as the source with the CT in series with the primary load drawing 2 Amp. Placed a load resistor across the secondary and measured the current flow, 5.3mA
I only had a couple of different loads to test with but the same proportional current flow was recorded, important with a current transformer!
While I was at it, I measured the DC resistance (1.5 Ohm - 115 Ohm) but I was surprised at the measured inductance, 14.04H, yes Henry not uH or mH
COSMETIC CONDITION:
USED (but you wouldn't know it, in great condition)
CLEAN (like new!)
No signs of any winding stress at all
NO physical damage and the windings are all TIGHT and SECURE
I have now protected this CT with bubble-wrap and sealed it within clear plastic packaging, awaiting a new owner ...
