PXIe-4463 Output Connections

Figure 3 shows the PXIe-4463 analog output block diagram. Depending on the connector type, connect the signals as shown on the inset.

Figure 3. PXIe-4463 Analog Output Block Diagram

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The PXIe-4463 output stage is a differential amplifier. The output stage can be configured to pseudodifferential mode in software, where the -AOn terminal is internally connected to chassis ground through a 50 Ω resistor. This connection introduces a gain difference in the output stage of -31.8 mdB, for which the software corrects automatically. Refer to the NI-DAQmx Help for more information about terminal configuration.

The PXIe-4463 output stage can also be configured to pseudodifferential mode by making an external connection between +AOn or -AOn to chassis ground. This connection introduces a gain change in the output stage of -34.8 mdB, for which the software does not correct.

For most applications, configuring the PXIe-4463 output stage in differential mode will yield the best performance. For improved common-mode noise rejection, it is highly recommended to make a connection between the chassis ground of the PXIe-4463 and the input device ground. This connection is critical when the input device is isolated; if this connection is not available, it may be better to configure the PXIe-4463 output stage in pseudodifferential mode.

Figures 4 and 5 show the recommended output connections for both connector types.

Figure 4. PXIe-4463 Mini-XLR Recommended Output Connection

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Figure 5. PXIe-4463 BNC Recommended Output Connection

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