Getting to these nuts are not easy given the tight clearance. The front panel binding posts are screwed onto the connectors that are soldered onto the bottom board. Taking out the front panel is not quite trivial as it turned out. And to access any components located on either the front panel digital board or the analog board located at the bottom of the case you have no choice but to partially dissemble the unit.Īnd this is exactly what I did. As you can see in the picture below, the power module boards are mounted directly on the heatsinks and the microcontroller board is tucked away behind the front panel. This becomes apparent after opening up the top cover. To achieve this compact design, some sacrifices need to be made.
The air then flows through the heatsinks and the hot air gets blown out from the back via another two fans. Two are sitting at the bottom of the chassis that sucks in air. This can be largely attributed to the efficient forced-air cooling system it uses. The entire unit is actually quite compact given the amount of power it is capable of dissipating. It can be used in constant current, constant power or constant resistance mode and can be controlled remotely via an RS232 interface. The Arrary 3711A can sink 300W with a maximum load current of 30A and maximum load voltage of 300V. You can find a video of this teardown towards the end of the post. In this blog post though, I am going to take a look inside an Array 3711A DC electronic load I recently purchased on eBay. For instance this simple harddrive cooler housed small dummy load, this more sophisticated constant current/constant programmable load and this heavy-duty electronic load that is capable of sinking over 1kW under peak load. It is an essential instrument for design, test and manufacture of many suitable products.I have made many electronic loads in the past. The backlight LCD, numerical keypad and rotary knob make it much easier to use. It offers constant current mode, constant resistance mode and constant power mode. It provides a convenient way to test batteries and DC power supplies.
Array 3700 series electronic load is a single input programmable DC electronic load.
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