Additional Features: Frequency range: 0.01 µHz to 30 MHz 2 Channels Frequency accuracy: ± (3 ppm of setting + 2 pHz) (External frequency reference of 10 MHz usable.) Frequency resolution: 0.01 µHz Amplitude accuracy: ± (1% of amplitude setting [Vp-p] + 2 mVp-p)/open Phase setting resolution: 0.001° (setting range: –1800.000° to +1800.000°) Duty setting range: 0.0000% to 100.0000%; resolution: 0.0001% Pulse wave rising/falling time: 15.0 ns to 58.8 Ms; 3-digit resolution/0.1 ns Resolution of arbitrary waveform data amplitude:  16 bits Input/output signal ground independent of housing and signal ground between channels also insulated Output voltage under specified load impedance can be set and displayed External signals can be added and output Up to ten settings can be saved USB and GPIB interfaces LabVIEW driver included Power supply input for 90 V AC to 250 V AC enables worldwide use Waveform display (TFT color LCD with the QVGA high resolution) Continuous, burst/trigger/gate, internal/external modulation, sweep, and sequence oscillation Two independent channels,  two phases, constant frequency difference, constant frequency ratio, and differential output Above all else, function generators must be very accurate. The WF1974 is a  high-specification instrument that delivers exceptional precision, stability and reliability in support of a wide variety of applications.