NI PXI-2555 Terminated 4×1 Multiplexer (SP4T) Topology

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Edition Date: April 2015

Part Number: 375472H-01

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The following figure represents the NI PXI-2555 in the terminated 4×1 multiplexer topology.

Caution  The terminators on the NI PXI-2555 are rated for 1.5 W at 25 °C. When operating at ambient temperatures greater than 25 °C, a termination power derating applies. Refer to the NI PXI-2555 Specifications for more information about termination power derating. Terminators cannot withstand the full rated power of the NI PXI-2555.

Making a Connection

Call the niSwitch Connect Channels VI or the niSwitch_Connect function to connect channels in this topology. If applicable, call the niSwitch Disconnect Channels VI or the niSwitch_Disconnect function to disconnect an existing connection before you call the niSwitch Connect Channels VI or the niSwitch_Connect function.

Note   All channels are disconnected from COM when the NI PXI-2555 is in its power on state. Any input channel not connected to COM is connected to its associated 75 Ω terminator.

The following sequence of tasks illustrates the VI/function calls necessary to make consecutive connections—one between CH 1 and COM and the other between CH 2 and COM:

  1. Call the niSwitch Connect Channels VI or the niSwitch_Connect function with parameters ch1 and com.
  2. Call the niSwitch Disconnect Channels VI or the niSwitch_Disconnect function with parameters ch1 and com.
  3. Call the niSwitch Connect Channels VI or the niSwitch_Connect function with parameters ch2 and com.

When scanning the NI PXI-2555, a typical scan list entry might be ch1->com;. This entry routes the signal connected to CH 1 to COM.

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