Fluke DDS Function Generator 271, Руководство пользователя

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271
Users Manual
1-2
Introduction
This Programmable Function Generator uses direct digital synthesis to provide high
performance and extensive facilities at a breakthrough price. It can generate a variety of
waveforms between 0.1 mHz and 10 MHz with a resolution of 7 digits and an accuracy
better than 10 ppm.
Principal features
Direct digital synthesis for accuracy & stability
Direct digital synthesis (DDS) is a technique for generating waveforms digitally using a
phase accumulator, a look-up table and a DAC. The accuracy and stability of the
resulting waveforms are related to that of the crystal master clock.
In addition the DDS generator offers high spectral purity, low phase noise and excellent
frequency agility.
A wide range of waveforms
High quality sine, square and pulse waveforms can be generated over the full frequency
range of 0.1 mHz to 10 MHz.
Triangle ramp and multi-level square waveforms also be generated over limited
frequency ranges.
Variable symmetry or duty-cycle is available for all standard waveforms.
Arbitrary waveform capability
Arbitrary waveforms can be loaded via the digital interfaces and then used in a similar
way to the standard waveforms.
Up to five arbitrary waveforms of 1024 10-bit words can be stored in non-volatile
memory. The maximum waveform clock frequency is 27.48 MHz.
This facility considerably expands the versatility of the instrument, making it suitable for
the generation of highly complex waveform patterns.
In addition, numerous complex waveforms are pre-defined in ROM, including commonly
used wave shapes such as sin(x)/x, exponentially decaying sine wave, etc. Further wave
shapes will be added to the library in response to customer requests.
Sweep
All waveforms can be swept over their full frequency range at a rate variable between
10 milliseconds and 15 minutes. Sweeps are fully phase continuous.
Sweeps can be linear or logarithmic, single or continuous. Single sweeps can be triggered
from the front panel, the trigger input or the digital interfaces. Two sweep markers are
provided.
Amplitude modulation
AM is available for all waveforms and is variable in 1 % steps up to 100 %. An internal
AM source is incorporated. Modulation may also be controlled by an external generator.
Frequency shift keying
FSK provides phase coherent switching between two selected frequencies at a rate
defined by the switching signal source.
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