Low Distortion Function Generator

DS360 Low Distortion Function GeneratorWaveformsThe DS360 generates clean sine waves and square waves, aswell as a two-tone signal for IMD testing. The two-tone signalis defined as either two sine waves, or a sine wave and asquare wave. Both frequency and amplitude are independentlyset for the two waves allowing standard two-tone formats likeSMPTE, DIM and CCIF to be generated. In addition tostandard waveforms, the DS360 outputs white noise, pinknoise and band-limited white noise.Audio OutputsAll functions and parameters are easily set using the frontpanelkeypad and spin knob. A wide variety of amplitude unitsincluding Vrms, Vpp, dBV, dBm and dBrel can be selected.Front-panel outputs including XLR, BNC and dual bananajacks assure compatibility with any system. The outputs canbe configured as balanced or unbalanced, with amplitudesfrom 20.0 µVpp to 80.0 Vpp (balanced), and 10.0 µVpp to40.0 Vpp (unbalanced). Chassis ground and output commonbanana jacks are also provided. Rear-panel digital outputsconform to AES-EBU and SPDIF/EIAJ formats. An XLR jackis provided for the AES-EBU output, and both fiber optic andcoaxial connectors are provided for the SPDIF/EIAJ output.Sweeps and BurstsUnlike single frequency analog sources, the DS360 generateslow-distortion frequency sweeps over its entire frequencyrange. Linear and log sweeps are set between 1 mHz and200 kHz with sweep times between 0.3 ms and 100 s. Sweepscan be single-shot or repetitive, and the instrument can sweepboth up and down in frequency. The DS360 providesoutstanding amplitude flatness (0.5 % up to 20 kHz) duringfrequency sweeps, and has a TTL level sweep marker outputfor synchronizing external equipment.The DS360 also creates tone bursts of sine waves and squarewaves. The number of ON cycles, repetition rate, and the OFFamplitude level can all be adjusted. Sweeps and bursts may betriggered from the internal rate generator or an externaltrigger, or they can be externally gated.Computer ControlThe DS360 is designed for benchtop use as well as automatedtesting. With standard IEEE-488.2 (GPIB) and RS-232interfaces, the DS360 is fully programmable⎯a feature seldomfound in low-distortion sources. All instrument functions canbe controlled or queried through the computer interfaces.-100.0-105.0-110.0-115.0-120.0-125.0-130.0-135.0-140.0-145.0-150.00.0 2.00k 4.00k 6.00k 8.00k 10.0k 12.0k 14.0k 16.0k 18.0k 20.0k-60.00-70.00-80.00-90.00-100.00-110.00THD vs. Frequency (Hz)Residual distortion for a 1 kHz, 28 Vrms (balanced) sinewave after passing through a non-distorting notch filterto attenuate the fundamental.-120.0020 100 1k 10k 20kTHD+N vs. Frequency (Hz)DS360 rear panelStanford Research Systems phone: (408)744-9040www.thinkSRS.com