There is this digital scope sold by ABI that is called a circuit master. It does a number of things but one thing that seems unique is that it applies a DC current to a circuit while at the same time measuring the response. It is designed to apply this to a live digital circuit, with power on. This is mostly used on digital circuits. The idea is if you are measuring a circuit with 0VDC you can determine if it is short or open and a number of other things. It measures the response and shows it, along with the voltage measured. Is anyone familiar with this technique and can someone explain a way I can do the same thing using a regular scope? What do I need as a source? I think there is a little more to it then just using my bench power supply as the source. Is there any other gear that uses this technique?