Before connecting a power supply in series or parallel, please read your instrument’s user manual to confirm how many instruments can be combined in either series or parallel connections. When connecting power supplies in series, the positive terminal of the second power supply needs to be connected to the negative terminal of the first supply. To add a third power supply, if it’s supported, again connect the positive terminal of the third power supply to the negative terminal of the second supply. To close the circuit, connect the negative terminal of the last supply to the positive terminal of the first. With the power supplies connected in this way, the voltages produced by the power supplies will be added together. This can be seen easily by connecting a voltmeter across the power supplies, connecting probes to the negative terminal of the last supply and positive of the first. To connect two power supplies in parallel simply connect all positive terminals together and all negative terminals together. With all positive nodes tied together and all negative nodes tied together, the potential at all positive terminals should be the same and all units will be sharing a common ground. As such, there is no “adding” of voltages. However, the currents of each power supply will be added together. For multi-channel units, combing channels can be done automatically by simply selecting the desired configuration from the front panel or SCPI programming.