User manual

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4.0 Programmable DC Power Supply
VirtualBench includes a programmable DC power supply with three independent channels capable of providing 0 V to 6
V at 1 A, 0 V to 25 V at 500 mA (isolated), and 0 V to -25 V at 500 mA (isolated). You can modify the power levels of each
channel through the VirtualBench application or the NI-VirtualBench driver API. Figure 4.1 shows the VirtualBench DC
power supply connector.
Figure 4.1. VirtualBench DC Power Supply Connector
Learning Objectives: You will understand these core VirtualBench concepts after completing the activities in this
chapter:
1. How to modify the selected values for the DC power supply
2. How to generate a signal using a function generator
3. How to observe circuit response by using an oscilloscope
4. How to export data to a .CSV file
4.1 Reviewing the Circuit Theory With Simulation
Follow along with these simulation experiments by using file VirtualBench Section4_Voltage Level Detector
Simulation.ms13.
A voltage level detection circuit uses an operational amplifier (op-amp) as a comparator that compares an input voltage
(V_IN) to a reference voltage (V_REF), as shown in Figure 4.2. The oscilloscope response is shown in Figure 4.3. The input
to the circuit is a 10 Hz, 5 V sine wave (V_IN).