srs DS345-30 MHz function/ARB generator

srs DS345-30 MHz function/ARB generator

主要指标与说明The DS345 Function Generator is a full-featured 30 MHz synthesized function generator that uses an innovative Direct Digital Synthesis (DDS) architecture. It generates many standard waveforms with excellent frequency resolution (1 μHz), and has versatile modulation capabilities including AM, FM, Burst, PM and frequency sweeps. It also generates arbitrary waveforms with a fast 40 Msample/s update rate.

DS345 Function/ARB Generator1 μHz to 30.2 MHz frequency range1 μHz frequency resolutionSine, square, ramp, triangle & noisePhase continuous sweepsAM, FM, PM & burst16,300 point arbitrary waveforms10 MHz reference inputRS-232 and GPIBDS345 Function/ARB GeneratorThe DS345 Function Generator is a full-featured 30 MHz synthesized function generator that uses an innovative Direct Digital Synthesis (DDS) architecture. It generates many standard waveforms with excellent frequency resolution (1 μHz), and has versatile modulation capabilities including AM, FM, Burst, PM and frequency sweeps. It also generates arbitrary waveforms with a fast 40 Msample/s update rate.Functions and OutputsThe DS345 generates sine waves and square waves at frequencies up to 30.2 MHz, and triangle and ramp waveforms up to 100 kHz. The frequency resolution for all functions is 1 μHz. In addition to the standard waveforms, the unit also provides a wideband (10 MHz) white noise source.Both the function output and a TTL SYNC output are available through floating, front-panel BNC connectors. Both outputs have 50 Ω output impedances and may be floated up to ±40 V relative to earth ground. The amplitude of all function outputs is adjustable from 10 mVpp to 10 Vpp with 3-digit resolution, and can be displayed in Vp, Vpp, Vrms or dBm. In addition, standard TTL and ECL output levels can be selected.Additional useful connectors are provided on the rear panel. A trigger input is used to trigger arbitrary waveforms, modulation patterns, sweeps and bursts, while a TTL trigger output is provided to allow synchronization of external devices to sweeps and bursts. A sweep output generates a 0 to 10 V ramp synchronous with frequency sweeps. The sweep marker outputs allow specified portions of a frequency sweep to be highlighted on an oscilloscope.A 10 MHz rear-panel input allows the DS345 to be synchronized to an external timebase. A 10 MHz rear-panel output allows multiple DS345's to be phase locked.

ModulationThe DS345 Function Generator offers a wide variety of modulation options. It contains an internal modulation generator which can modulate any of its standard waveforms except noise. The modulation waveform can be a sine, square, triangle, ramp or an arbitrary waveform. Modulation rates from 1 mHz to 10 kHz can be selected.The modulation generator can provide amplitude modulation (AM), frequency modulation (FM), and phase modulation (PM). When using AM, modulation depths of ±100 % can be selected with 1 % resolution. Negative values of modulation correspond to Double Sideband Suppressed Carrier (DSBSC) modulation. FM spans can be selected with 1 μHz resolution, and phase modulation can be set between 0° and 7200° with 0.001° resolution.External Amplitude ModulationIn addition to the internal modulation generator, the output waveform can be amplitude modulated by an external signal applied to the rear-panel AM input. This input is always active-even when other modulation types are turned on.Burst ModulationYou can generate tone bursts of any output function except noise. In burst mode, the DS345 will output an exact number of complete waveform cycles after receiving a trigger. By adjusting the phase, you can control where in the waveform the burst begins. While using the burst mode, the maximum frequency for sine waves and square waves is 1 MHz, while triangles and ramps are limited to 100 kHz. Burst mode may be used with arbitrary waveforms at any frequency.Frequency SweepsFrequency ModulationThe DS345 Function Generator can frequency sweep any of its function outputs (except noise). You can sweep up or down in frequency using linear or log sweeps. Unlike conventional function generators, there are no annoying discontinuities or band-switching artifacts when sweeping through certain frequencies. The DS345's DDS architecture inherently allows it to perform smooth, phase-continuous sweeps over it's entire frequency range.Two sweep marker frequencies can be specified. When the sweep crosses either of the marker frequencies, a TTL transition is generated at the rear-panel MARKER output to allow synchronization of external devices.Arbitrary Waveform CapabilityThe DS345 isn't just a function generator. It's also a full-featured arbitrary waveform generator. Output waveforms have 12-bit vertical resolution, and can be played back at rates up to 40 Msamples/s.Since composing complex arbitrary waveforms at the keyboard can be a tedious task, Arbitrary Waveform Composer (AWC) software is provided at no charge. AWC is a menu-based program which lets you create and edit arbitrary waveforms on the screen, store them, and download them to the DS345. Click here for the latest version of the Windows AWC software. DS345 Function/ARB GeneratorFrequency range Max. Frequency ResolutionSine 30.2 MHz 1 μHzSquare 30.2 MHz 1 μHzRamp 100 kHz 1 μHzTriangle 100 kHz 1 μHzNoise 10 MHz (Gaussian weighting)Arbitrary 10 MHz 40 MHz/N (sample rate)OutputSource impedance 50 ΩGrounding Output may float up to ±40 V (AC + DC) relative to earth ground.AmplitudeRange 0.01 to 10 Vpp (50 Ω), 20 Vpp (Hi-Z)Resolution 3 digits (DC offset: 0 V)Sine wave accuracy (0 V DC offset) 5 to 10 Vpp ±0.2 dB (1 μHz to 20 MHz)±0.3 dB (20 MHz to 30.2 MHz) 0.01 to 5 Vpp ±0.4 dB(1 μHz to 20 MHz)±0.5 dB (20 MHz to 30.2 MHz)Square wave accuracy 5 to 10 Vpp ±3 % (1 μHz to 100 kHz)±6 % (100 kHz to 20 MHz)±15 % (20 MHz to 30.2 MHz) 0.01 to 5 Vpp ±5 % (1 μHz to 100 kHz) ±8 % (100 kHz to 20 MHz) ±18 % (20 MHz to 30.2 MHz)Triangle, ramp, arbitrary accuracy ±3 % (>5 Vpp)±5 % (<5 Vpp)

DC OffsetRange ±5 V (limited such that |VAC peak| + |VDC| < 5 V)Resolution 3 digits (VAC = 0)Accuracy 1.5 % of setting + 0.2 mV (DC only) ±0.8 mV to ±80 mV, depending on AC and DC settingsSine WaveSpurious components <-55 dBc (non-harmonic)Phase noise <-50 dBc in a 30 kHz band centered on the carrier, exclusive of discrete spurious signalsSub-harmonic <-50 dBcHarmonic distortion Level<-55 dBc<-45 dBc<-35 dBc<-25 dBcFrequency RangeDC to 100 kHz0.1 to 1 MHz1 to 10 MHz10 to 30 MHzSquare WaveRise/fall time <15 ns (10 to 90 %), at full outputAsymmetry <1 % of period + 4 nsOvershoot <5 % of peak to peak amplitude at full outputRamps, Triangle and Arbitrary WaveformsRise/fall time 45 ns (10 MHz Bessel filter)Linearity ±0.5 % of full-scale outputSettling time <1 μs to settle within 0.1 % of final value at full outputArbitrary WaveformsSample rate 40 MHz/N, N = 1 to 234-1Memory length 8 to 16,300 pointsResolution 12 bits (0.025 % of full scale)PhaseRange ±7199.999° with respect to arbitrary starting phaseResolution 0.001°Amplitude ModulationSource Internal (sine, square, triangle or ramp) or ExternalDepth 0 to 100 % AM or DSBSCRate 0.001 Hz to 10 kHz internal, 15 kHz max. externalDistortion <-35 dB at 1 kHz, 80 % depthDSB carrier <-35 dB typ. at 1 kHz modulation rate (DSBSC)External input ±5 V for 100 % modulation, 100 kΩ impedance, 15 kHz bandwidthFrequency ModulationSource Internal (sine, square, triangle, ramp or arbitrary)Rate 0.001 Hz to 10 kHzSpan 1 mHz to 30.2 MHz (100 kHz for triangle, ramp)Phase ModulationSource Internal (sine, square, triangle, ramp)Rate 0.001 Hz to 10 kHzSpan ±7199.999°Frequency SweepType Linear or log, phase continuousWaveform Up, down, up-down, single sweepTime 0.001 s to 1000 sSpan 1 mHz to 30.2 MHz (to 100 kHz for triangle, ramp)Markers Two markers may be set at any sweep point (TTL output)Sweep output 0 to 10 V linear ramp signal, synchronized to sweepBurst ModulationWaveform Any waveform except noise may be burst modulatedFrequency Sine, square to 1 MHzTriangle, ramp to 100 kHzArbitrary to 40 MHz sample rateCount 1 to 30,000 cycles/burst (1 μs to 500 s burst time limits)Trigger GeneratorSource Single, Internal, External, LineRate (internal) 0.001 Hz to 10 kHz (2-digit resolution)External trigger Positive or negative edge, TTLOutput TTL levelStandard TimebaseAccuracy ±5 ppm (20 °C to 30 °C)Aging 5 ppm/yearInput 10 MHz/N ± 2 ppm (N = 1 to 8) 1 Vpp minimum input levelOutput 10 MHz, >1 Vpp sine into 50 ΩOptional TimebaseType Ovenized AT-cut oscillatorStability <0.01 ppm, 20 °C to 60 °CAging <0.001 ppm/dayAllan variance (1 s) <5 × 10-11GeneralInterfaces Optional RS-232 (300 to 19.2 kbaud, DCE) and GPIB with DOS based arbitrary waveform software (AWC). All instrument functions are controllable over the interfaces.Non-volatil