DS340
Function & Arbitrary Waveform Generator
  • 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
DS340 Front Panel
DS340 Rear Panel
Features

The DS340 is a general-purpose, 15 MHz function and arbitrary waveform generator based on Direct Digital Synthesis (DDS). A combination of features, performance and low cost make the DS340 ideal for a variety of test and measurement applications.

Sine 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 DS340 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 DS340's waveform memory via the optional GPIB or RS-232 interfaces. PC software for composing, editing and downloading arbitrary waveforms is provided at no charge. The waveform memory can be played back at sample 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.

 
Specification
Frequency Range
Max. Frequency Resolution
Sine 15.1 MHz 1 µHz
Square 15.1 MHz 1 µHz
Ramp 100 kHz 1 µHz
Triangle 100 kHz 1 µHz
Noise 10 MHz (Gaussian weighting)
Arbitrary 10 MHz 40 MHz/N (sample rate)
Output
Source impedance 50 W
Grounding Output may float up to ±40 V (AC + DC)
Amplitude
Range 50 mVpp to 10 Vpp into 50 W , 100 mVpp to 20 Vpp into High-Z
Resolution 3 digits (DC offset = 0 V)
Offset ±5 VDC (50 W ), ±10 VDC (High-Z)
Offset resolution 3 digits
Accuracy 0.1 dB (sine output)
Sine Wave
Spurious response <-65 dBc to 1 MHz, increases by 6 dB/oct above 1 MHz
Harmonic distortion
     DC to 20 kHz <-70 dBc
     20 kHz to 100 kHz <-60 dBc
     100 kHz to 1 MHz <-50 dBc
     1 MHz to 15 MHz <-40 dBc
Phase noise
<-55 dBc (30 kHz band centered on carrier)
Square Wave
Rise/fall time 15 ns ± 5 ns (10 % to 90 %)
Asymmetry <3 ns + 1 % of period
Overshoot <2 % of amplitude (full output)
Ramps and Triangles
Rise/fall time 45 ns
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
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
Dimensions 8.5" ´ 3.5" ´ 13" (WHL)
Weight 8 lbs.
Power 35 W, 100/120/220/240 VAC, 50/60 Hz
Warranty One year parts and labor on defects in materials and workmanship