Merging channels of an NI SMU allows you to use multiple channels in unison to increase the current you can source beyond the normal maximum for any one channel of the SMU.
Only certain primary channel–merge channels combinations are supported for each merge count.
|Primary Channel||Possible Merge Counts||Required Merge Channel(s)|
To use merged channels for a higher maximum current, you must design the interface that conveys and the circuitry that combines the current output from the SMU accordingly.
The specific interconnect and circuitry you need depend on your application, but refer to the following general guidelines for designing these elements:
Use the NI-DCPower API to program the SMU for merged channels.Before you program your SMU for merged channels using the NI-DCPower API, ensure your destination circuitry is designed accordingly. Refer to Connection Guidelines for Merged Channels for general information.
For example, for a four-channel SMU that can source up to 3 A on an independent channel, designating channel 0 as the primary channel and using the Merged Channels property to specify channel 1 as the merge channel yields a merge count of ×2.