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 MATSUNAGA (Yokohama Japan) Frequency Converter, intended for laboratory use and providing up to 240V AC at a user adjustable variable frequency. Not only that, the AC voltage output could be varied across a wide range AND the user could set current limiting, so it could alter all three aspects of the AC output wavefrom, frequency, voltage and current limiting. I actually fired this gear up and it was working great but oh dear! What to do with it? Sure you could put up on the workbench but at that sort of weight it needed a lot of space and a good solid workbench. I decided a while back to offer this equipment as a complete unit "elsewhere" online 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 scrap marks on various places of the all steel casing.
So, the "donor operation" has begun and here is one of the very nice components .... a 20 Watt wirewound power resistor
UNRECOGNISED MANUFACTURER - Power Resistor
Ex MATSUNAGA laboratory/industrial test equipment
I strongly suspect this is a Chiba, Japan product, they produce very similar looking power resistors with code sequences that agree with the codes on this resistor
Made in Japan
Wirewound (G)
Green Tubular (hollow) Ceramic body 3mm thickness
Part # RGH 20G 1KΩJ
A company logo is printed on the body but I cannot find out who it is, I have no supplier list for the original equipment nor even a schematic. The logo has a diamond shape outline, within which is a T with o on either side.
1KΩ
5% tolerance (J)
20 Watts (Average)
200 Watts (5 second maximum)
Flame-proof
Up to 120°C before resistance becomes substantially affected
Radial solder tags (11mm length x 0.5mm diameter)
DIMENSIONS:
Body: 50mm length x 20mm diameter *without end caps fitted
End caps are 5mm thick ceramic and therefore add a further 10mm to the above length
NOTES ABOUT USE:
Could be mounted using just the solder tag 'feet' or (as in the case of the original equipment) a bolt is inserted through the centre of the end caps and this holds the resistor in place. In the MATSUNAGA, this resistor(s) was mounted vertically using a very long bolt, 2.6mm diameter. I will include this bolt if someone wishes to purchase both of the resistors I have, OTHERWISE this bolt is not included (for single resistor purchases)
TESTING:
DC resistance test (at 15C)
#1 1002 Ohm
#2 997 Ohm
Well within the +/- 5% tolerance band
COSMETIC CONDITION:
USED
CLEAN
NO body damage to the resistor OR end caps i.e no chips, no cracks etc
These are quite delicate, being ceramic, so they are now wrapped in protective bubble-wrap and sealed in clear plastic packets
*** Where the photograph shows more than one power resistor, the description price is for ONE POWER RESISTOR only, not all of them ***
