... Freq. 2.multi-waves test, base on DDS technology 3.w/AM FM function MCH DDS Function Generator, SM-4040 DDS ... -100S ±1% (10mHz-10kHz)Control modeINT/EXT (External TTL level,F1:low-level,F2:high-level)Phase-shift keyingWaveformsine, squareFrequency range100 ... DDS Function Generator,SM-4040 dds function generator,40MHz frequency w/AM FM