NI PXI/PXI-5401
SYNC Connector
The SYNC output is a TTL version of the sine waveform generated at the output. The SYNC output has a very high-frequency resolution, with a software-programmable clock source for many applications. You can also dynamically vary the duty cycle of the SYNC output between 20% to 80% by software control. The SYNC output derives from a comparator connected to the analog waveform and provides a meaningful waveform only when you generate a sine wave on the ARB output. The following figure shows the timing relationship between the SYNC and analog output waveform.
tp is the time period of the sine wave generating and tw is the pulse width of the SYNC output. The duty cycle is (tw/tp) × 100%.