You can achieve this function if you connect two external power supplies, one is +6V, one is -6V. The circuit diagram is shown in Figure 1.
Figure 1. Circuit Diagram
Instructions:
- Use a SMU PXI-4130 (or equivalent) to generate +6V and -6V power supplies.
- Set up the NI 9477 in a compact DAQ chassis.
- Use the LabVIEW example of Digital- Continuous Output.vi to generate a pulse train/square wave signal in the DO terminal, see Figure 2.
Figure 2. LabVIEW Example
- Use an oscilloscope to view the PWM signal generated at DO. An example can be seen in Figure 3.
Figure 3. Output Waveform
Additional Information
The power supply doesn't have to be a NI SMU, any other power supply vendor may be used. This method can be applied to any voltage generated by a power supply within the hardware spec.