The figure below illustrates the GX1838 architecture. The board is programmed by software using the PXI interface to set the DACs' voltages; the rails source and the channels' rail connections. The board connector on the right (J3) provides interface to the output the channels' signals and external input signals.
GX1838 Block Diagram
The GX1838 provides eight parallel analog output channels which interface through a 25-pin D-Type connector (J3). Each channel can be connected to one of the three rails or disconnected from all rails. Channel settings are done through a software driver in order to set the channels' source. The figure below shows a typical output channel diagram:
Typical Output Channel
The GX1838 contains three individual rails. Each rail can connect to its own set of resources. The figure below presents a diagram for the GX1838 rail connections.
GX1838 Rail Sources
All rails (A, B and C) are calibrated with a load of 1000 Ohms over the full range of –10V to 32V or -20V to +20V. A slight shift in output value may occur if the actual load is different from the specified 1000 Ohm load.