📄 generating standard waveforms with the ni 5401-ni 5411- ni 5431 function generator - example - development library - national instruments.htm
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content="This LabVIEW Example generates standard waveforms such as a sine, square, ramp, or DC signal. There are controls on the front panel to control the frequency, amplitude, offset, and type of waveform generated. For the NI 5401 and NI 5411, the maximum sine frequency you can generate is 16 MHz. For the NI 5431, the maximum frequency is limited to 8 MHz. The maximum amplitude is 5 Vpk into a 50 ohm load. If the load is a high-impedance load, the actual levels are twice that shown on the front panel. The waveforms are created using the Direct Digital Synthesis (DDS) technique, used for deriving, under digital control, an analog frequency source from a single reference clock frequency. This technique produces high-frequency accuracy and resolution, temperature stability, wideband tuning, and rapid and phase-continuous frequency switching. The NI 5401/5411/5431 uses a 32-bit, high-speed accumulator with a lookup memory and a 12-bit DAC for DDS-based waveform generation. The lookup memory is dedicated to the DDS mode only and cannot be used in Arb mode. You can store one cycle of a periodic waveform; a sine, triangular, square, or periodic arbitrary wave in the lookup memory. Then, you can change the frequency of that waveform by sending just one instruction. You can use DDS mode for very fine frequency resolution function generation. You can generate sine waves of up to 16 MHz for the NI 5401 and the NI 5411 and 8 MHz for NI 5431 with a frequency resolution of 9.63 mHz. Because this mode uses an accumulator, waveform generation loops back to the beginning of the lookup memory after passing through the end of the lookup memory. "
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