NI PXI/PCI-5431
SYNC OUT

The SYNC OUT front panel connector is a TTL version of the sine waveform generated at the output. The signal from the pre-amplifier is sent to a comparator, where the signal is compared against a level set by the level DAC. The output of this comparator is sent to the SYNC connector through a hysteresis buffer and a 50 Ω series resistor to reverse terminate reflected pulses.

You can use the SYNC output as a very high-frequency resolution, software-programmable clock source for many applications. You also can vary the duty cycle of SYNC output dynamically by changing the output of the level DAC. The SYNC output does not work for other types of generated waveforms.

Note  You can change the duty cycle of the SYNC output at any time during waveform generation.