I need hardware that will generate multiple frequency signals (@28VDC) that can have their properties changed on the fly.

[Randall]

My intent is to generate two different types of frequency signals. 1) a variable frequency, 50% duty cycle, 28VDC signal 2) 5-95% duty cycle, 500 Hz, 28VDC signal. I need multiple of each, and am trying to find LabVIEW compatible hardware that will generate these signals without too much add modification.

[Michael_S.]

Randall,

The 660x counter boards are the best solution to generating square waves at different frequencies as you mentioned, and the 671x analog output boards are best suited for outputting other waveforms needed.

However, both boards can only output signals from -10 to 10V so you will need to add your own amplifier to front of these signals to boost the signal range to 28V.