The figure below shows the GX3348’s block diagram and illustrates the GX3348’s architecture. The board is programmed by software using the PXI interface to set the DAC voltages; configure the sources, program the matrix, and measure voltages on the matrix’s outputs. The board connector utilizes a 78-pin D-type connector, which provides access to all instrument connections, atrix’s outputs. The board connector utilizes a 78-pin D-type connector, which provides access to all instrument connections.
GX3348 Block Diagram
The GX3348 includes (3) programmable DC sources, a +5VDC source, and an amplifier which can be used to amplify an external input signal. The GX3348A and GX3348A-64 also includes the function generator source, which is routed via Rail 1. A block diagram of these sources is shown in the function above. Source selection and routing is done via the software driver.
Analog Rails
The programmable DC rails have 16-bit resolution and are capable of supplying up to 500 mA. Note that total current from all three sources cannot exceed 500 mA. The +5V source is sourced via the PXI 5 V power supply and total current should not exceed 3A. The amplifier has a nominal gain of 6.6 and can amplify signals from DC to > 10 KHz. The output voltage range is -20 V to +32 V @ 500 mA. All rails (A, B and C) are calibrated with a load of 1KOhms over the full range of –20V to 32V.