Products > Test Equipment

ARRAY electronic loads

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nctnico:
I recently bought two Array 3710A loads (the 150W model). They work ok for testing power supplies. Fortunately the fans only switch on when they have to. The only downside is that they use relais to switch between the two load cells inside. Depending on the load / voltage they change over which causes interruptions on the load presented on the input. I converted one the have 4mm style inputs. The build quality is OK. Actually the casing is an exact copy of old style HP equipment  :)

NiHaoMike:
Maybe use incandescent light bulbs or heaters with PWM control? The hardest part of building a large load is dissipating all the power, which is what the heaters or light bulbs do very well. A grid tie inverter can recycle a large percent of the power, but it only makes sense if you're doing a lot (as in near 24/7 burn in tests at a factory) of high power testing.

bsgd:
I have 2 BK 8500 loads and I like them a lot. At first I was inclined to get an Agilent 6060B, but it was kind of expensive and getting two would cost me too much.

nctnico:
Here is a picture of the inside of my 3710. Note that I modified the input connectors!

Rufus:
Inside of a Beich CH8710B.

Cheap and Chinese same as the rest. I am pretty disgusted with all these loads. I haven't seen one specify a maximum voltage rating between inputs and earth. I assume they all have all the internal circuity tied to the -ve input and floating with respect to earth.

Cracks me up, the BK and Itech manuals have a page full of safety drivel but neglect to tell you that if you stick 360v on the +ve input terminal you are going to get 360v on the pins of the 9 way 'D' comms connector on the back.

This Beich has RS232 conversion built in but it isn't isolated, at least the Itech etc want you to buy a comms adapter which if you believe the label on it is isolated but nothing tells you why it needs to be.

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