Sometimes an application requires more voltage than a single channel of a programmable power supply can output. If your power supply offers isolated outputs or a combination of isolated and non-isolated channels, you can easily extend the maximum output range by cascading channels in series.
For example, the NI PXI-4110 triple output power supply offers default configuration shown in figure 1.
Figure 1. (A) The PXI-4110 Default configuration and (B) Cascading two channels to create a single +40V@1A channel
NOTE: When cascading modules, be sure to not exceed the maximum common mode of a power supply. For example, the PXI-4110 has a maximum common-mode of +60VDC from ground