The Stanford Research Systems (SRS) DS340 model is a 15 MHz function and arbitrary waveform generator based on Direct Digital Synthesis (DDS). A combination of features, performance and low cost make the SRS DS340 Generator ideal for a variety of test and measurement applications.
Sine waves and square waves can be generated at frequencies up to 15.1 MHz, and ramps and triangles up to 100 kHz. Frequency resolution is 1 µHz for all functions. The SRS DS340 Generator also includes a 10 MHz Gaussian white-noise generator.
All functions can be swept logarithmically or linearly in a phase-continuous fashion over the entire frequency range of the instrument. A rear-panel SWEEP output provides a trigger signal at the start of a sweep to allow synchronization of external devices. Both unidirectional and bidirectional sweeps can be selected.
Up to 16,300 arbitrary waveform points can be downloaded to the SRS DS340 Generator’s waveform memory via the optional GPIB or RS-232 interfaces. PC software is provided for for composing, editing and downloading arbitrary waveforms. The waveform memory can be played back at rates up to 40 Msamples/s.
Both internal and external FSK modes allow the output frequency to be rapidly toggled between two preset values. FSK toggling can be done internally (at rates up to 50 kHz), or externally via a rear-panel input.
Arbitrary Waveform Composer (AWC) software is provided at no charge. AWC is a simple, menu-based program which lets you create and edit arbitrary waveforms on the screen, store them and download them to the SRS DS340 Generator.
Features and Specification of theWaveform Generator include:
●1 µHz to 15.1 MHz frequency range
●1 µHz frequency resolution
●Sine, square, ramp, triangle and noise
●Phase continuous frequency sweeps
●16,300 point arbitrary waveforms
●FSK modulation
●Optional RS-232 and GPIB interfaces
●Frequency Range:
■Sine:
■Max Frequency: 15.1 MHz
■Resolution: 1 µHz
■Square:
■Max Frequency: 15.1 MHz
■Resolution: 1 µHz
■Ramp:
■Max Frequency: 100 kHz
■Resolution: 1 µHz
■Triangle:
■Max Frequency: 100 kHz
■Resolution: 1 µHz
■Noise:
■Max Frequency: 10 MHz
■Resolution: (Gaussian weighting)
■Arbitrary:
■Max Frequency: 10 MHz
■Resolution: 40 MHz/N (sample rate)
●Output:
■Source Impedance: 50 O
■Grounding: Output may float up to ±40 V (AC + DC)
●Amplitude:
■Range: 50 mVpp to 10 Vpp into 50 O 100 mVpp to 20 Vpp into High-Z
■Resolution: 3 digits (DC offset = 0 V)
■Offset: ±5 VDC (50 O), ±10 VDC (High-Z)
■Offset resolution: 3 digits
■Accuracy: 0.1 dB (sine output)
●Sine Wave:
■Spurious Response:
■Harmonic Distortion:
■DC to 20 kHz
■20 kHz to 100 kHz
■100 kHz to 1 MHz
■1 MHz to 15 MHz
■Phase Noise:
●Square Wave:
■Rise/Fall Time:
■Asymmetry:
■Overshoot:
●Ramps and Triangles:
■Rise/Fall Time: 45 ns (10 MHz Bessel filter)
■Linearity: ±0.1 % of full scale
■Settling Time: 200 ns (0.5 % of final value)
●Arbitrary Waveforms:
■Sample Rate: 40 MHz or integer sub-multiples
■Waveform Length: 8 to 16,300 points
■Vertical Resolution: 12 bits
■Rise/Fall Time: 45 ns (10 MHz Bessel filter)
●FSK Modulation:
■Modes: Internal, External
■Max Rate: 50 kHz, internal
■External FSK: TTL input, 1 MHz (max)
●Sweeps:
■Type: Linear and logarithmic (phase continuous)
■Span: Linear (full frequency range), log (6 decades)
■Sweep Rate: 0.01 Hz to 1 kHz
●Timebase Accuracy:
■Standard: ±5 ppm (20 °C to 30 °C)
■Optional: TCXO, 2 ppm stability, 2 ppm aging (20 °C to 50 °C
●General:
■Interfaces: Optional RS-232 and GPIB with DOS based arbitrary waveform software (AWC). All instrument functions can be controlled over interfaces.
■Non-Volatile Memory: 9 sets of instruments settings can be stored and recalled
■Power: 35 W, 100/120/220/240 VAC, 50/60 Hz
