Today’s quick teardown target is a 1985 vintage electronic load made by Kikusui of Japan. It came from eBay with a noisy fan, but was otherwise fairly functional despite the considerable age.
The load offers quite a nice set of features, all without using a microcontroller.
- Constant current and constant resistance modes
- 4-110V input range up to 12A
- 12A and 1.2A range
- Two independently settable current levels with pulse ability (1kHz and 100 Hz)
- Current monitoring output for scope connection
Being purely analog, no serial interfaces are available. Instead the load takes voltage and resistance control signal via terminals on the back. Opening the lid brings us a very tightly packed unit:
For those interested, user manual is here. The load is very compact and handy, especially for those with small desks. The exposed high voltage leads on the transformer made me want to put a sheet of isolating material on the inside the case opposite of them, just in case. At least the case is grounded…