Protek Test and Measuremet offers its Model B8040FD DDS function generator. This high stability direct digital synthesis dual-output function generator has less than -54 dBc (Sine wave) harmonic distortion and a keyboard for rapid entry of waveform parameters. It delivers 40-ppm long-term and 1-ppm short-term stability; it generates waveforms including Sine, Square, Pulse, Triangle, exponential up and exponential down, Ramp, Sine (x) x and Plus Noise. It provides AM, FM, PM, FSK, ASK, PSK modulation and bursts of up to 65, 535 of all internal waveforms. The frequency range is 1 µHz to 40 MHz for Sine wave, to 5 MHz for Square Wave and 1 MHz for all other waveforms. It has a built-in 100-MHz frequency counter and an RS232 interface.