Solution
To determine which version of the module you have, locate the device name in one of the following places:
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In MAX—The PXIe-4139 (40W) shows NI PXIe-4139 (40W), and the PXIe-4139 (20W) shows as NI PXIe-4139.
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Device front panel—The PXIe-4139 (40W) shows PXIe-4139 40W System SMU, and the PXIe-4139 (20W) shows NI PXIe-4139 Precision System SMU on the front panel.