The following figure shows the terminals on the PXIe-4139 connector.

Figure 5. PXIe-4139 Connector Pinout


Table 4. Signal Descriptions
Signal Name Description
Output LO LO force terminal connected to channel power stage (generates and/or dissipates power). Positive polarity is defined as voltage measured on HI > LO.
Sense LO Voltage remote sense input terminals. Used to compensate for I*R voltage drops in cable leads, connectors, and switches.
Guard Buffered output that follows the voltage of the HI force terminal. Used to drive shield conductors surrounding HI force and Sense HI conductors to minimize effects of leakage and capacitance on low level currents.
Output HI HI force terminal connected to channel power stage (generates and/or dissipates power). Positive polarity is defined as voltage measured on HI > LO.
Sense HI Voltage remote sense input terminals. Used to compensate for I*R voltage drops in cable leads, connectors, and switches.