Synthesized Function Generators DS360 — Ultra-low distortion function generator DS360 Function Generator · 10 mHz to 200 kHz frequency range · <−100 dBc distortion (to 20 kHz) · Sine, square, white and pink noise · 20 µVpp to 40 Vpp output range · Linear and log frequency sweeps · 25 ppm frequency accuracy · 10 MHz reference input (opt.) · Balanced and unbalanced outputs · RS-232 and GPIB interfaces Stanford Research Systems The performance of a low-distortion analog source and the precision of direct digital synthesis (DDS) is combined in the DS360. With less than 0.001 % total harmonic distortion (THD), 25 ppm frequency accuracy, and a broad range of features including sweeps and bursts, the DS360 is the ideal source for audio frequency applications. Ultra-Low Distortion and Noise Unlike conventional RC oscillators, the DS360 uses digital signal processing and a precision 20-bit D/A converter to provide better than –100 dB distortion over the audio frequency range. With its DDS architecture, the DS360 has the features and flexibility of a contemporary synthesized function generator. Careful shielding and board layout keep the output noise to a minimum, making the DS360 the instrument of choice for audio research and development, manufacturing, and automated testing. Frequency Stability Low-distortion analog sources have impressive THD specifications, but suffer with poor frequency accuracy and resolution. The DS360 delivers 0.0025 % frequency accuracy over its entire frequency range. It has 6-digit frequency resolution from 1 mHz to 200 kHz, and a steady 25 ppm frequency stability. You can actually dial in 123,456 Hz from the front panel and have it mean something!

DS360 Low Distortion Function Generator Waveforms The DS360 generates clean sine waves and square waves, as well as a two-tone signal for IMD testing. The two-tone signal is defined as either two sine waves, or a sine wave and square wave. Both frequency and amplitude are independently set for the two waves allowing standard two-tone formats like SMPTE, DIM and CCIF to be generated. In addition to standard waveforms, the DS360 outputs white noise, pink noise and band-limited white noise. Audio Outputs All functions and parameters are easily set using the frontpanel keypad and spin knob. A wide...

Sine or Square Burst On cycles Repetition rate Triggering Off level Off resolution Max. off attenuation Frequency range 0.01 Hz to 200.000 kHz THD (1 Vrms unbalanced, 2 Vrms balanced) (<5 kHz) –110 dB (typ.), –106 dB (max.) (5 to 20 kHz) –104 dB (typ.), –100 dB (max.) (20 to 40 kHz) –100 dB (typ.), –96 dB (max.) (40 to 100 kHz) –90 dB (typ.), –85 dB (max.) (100 to 200 kHz) –76 dB (typ.), –68 dB (max.) THD (10 Vrms unbalanced, 20 Vrms balanced) (<5.0 kHz) –109 dB (typ.), –105 dB (max.) (5 to 20 kHz) –103 dB (typ.), –99 dB (max.) (20 to 40 kHz) –98 B (typ.), –93 dB (max.) (40 to 100 kHz) –88 dB...

Broadband Noise (1 kHz sine wave into Hi-Z load) <12.6 mVpp <4 nV/√Hz 12.6 mVpp to 126 mVpp <7.5 nV/√Hz 126 mVpp to 1.26 Vpp <15 nV/√Hz 1.26 Vpp to 40 Vpp <150 nV/√Hz Unbalanced Floating voltage Requirements Stability Internal External Indicators Unbalanced output 0 to ±7.4 VDC (50 Ω load ) 0 to ±10.0 VDC (600 Ω load ) 0 to ±20.0 VDC (Hi-Z load ) Balanced output Not active Resolution 3 digits Accuracy (all except pink noise) 1 % ± 25 mV (Vp + offset > 0.63 V) 1 % ± 2.5 mV (0.63 V > Vp + offset > 0.063 V) 1 % ± 250 µV (63 mV > Vp + offset > 6.3 mV) 1 % ± 50 µV (Vp + offset < 6.3 mV) (pink noise)...