Additional Features: Flexible resource expander unit for the 4155C and 4156C 2 pulse generator units (PGUs) are available as an option 1 high-power SMU or 2 medium-power SMUs are available as an option 1.6A ground unit included in all 41501B configurations The Agilent 41501B SMU and Pulse Generator Expander unit is available to augment the measurement capabilities of the 4155C and 4156C. The 41501B plugs into the rear of the 4155C/4156C, and its additional measurement resources are automatically recognized by the 4155C/4156C during boot-up. These additional resources appear in the 4155C/4156C “Channels: Channel Definition” page and they are treated exactly the same as the measurement resources of the 4155C/4156C. The 41501B PGUs can be used with the 16440A SMU/PGU selector to perform Write/Erase endurance testing on Flash memory cells and other types of non-volatile memory cells. The 41501B HPSMU can source/sink up to 1 A of current and supply up to +/-200 V of voltage.