Fluke 271 DDS Function Generator with ARB

The Fluke 271 is a high-performance function generator that uses Direct Digital Synthesis techniques. A wide variety of standard waveforms are provided and an arbitrary waveform capability allows it to be used to generate non-standard and user-defined waveforms. Extensive modulation capabilities make this a highly versatile signal source.

Standard waveforms are sine, square, positive pulse, negative pulse, triangle, ramp up, ramp down. Additionally arbitrary waveforms, multi-level square waves, waveform hopping and pseudo-random noise can be generated All waveforms are available up to 10 MHz. However, the purity of triangle, ramp, and multi-level square wave waveforms is not specified above the specific ranges of the generator.

Direct digital synthesis
Direct digital synthesis (DDS) is a technique for generating waveforms digitally using a phase accumulator, a look-up table and a digital-to-analog-converter (DAC). The accuracy and stability of the resulting waveforms is related to that of the crystal master clock. The DDS generator offers not only exceptional accuracy and stability but also high spectral purity, low phase noise and excellent frequency agility.

Arbitrary (and complex)
A number of "complex" waveforms are pre-programmed in the ROM. A further five, user defined, waveforms may be loaded via the digital interfaces and stored in non-volatile RAM. The frequency range and all waveform points can be continuously output up to 27 kHz, beyond which they are sampled at initially.

Trig/Sweep out
The Fluke 271 is capable of Multi-function output, depending upon the mode. Except when it is in sweep mode, the output is that of the trigger generator at CMOS/TTL levels from 1 kW. While in Sweep mode, the output is a 3-level waveform, changing from high (+4 V) to low (0 V) at the start of sweep, with narrow 1 V pulses at each marker point.

Fluke 271 Specifications
Frequency Range

0.1 mHz to 10 MHz

Resolution 7 digits or 0.1 mHz
Accuracy Typically < ±10 ppm for 1 year, 18 °C to 28 °C
Tempco. Typically < 1 ppm/°C outside 18 °C to 28 °C
Sinewave Distortion

< –60 dBc to 20 kHz, < –50 dBc to 300 kHz, < -35 dBc to 10 MHz

Spurii Non -harmonically related spurii typically <- 60 dBc to 10 MHz
Positive and Negative Linearity error Ramp

< 0.5 % to 30 kHz

Pulse < 22 ns
Arbitrary (and complex) # of samples

1024 10 bit samples

Noise Wideband noise with variable amplitude and offset.
Multi-Level Square wave General Up to 16 steps available per cycle, each step selectable for amplitude (10 bit resolution) and duration (1 to 1024 samples). Above 27 kHz a 36ns edge uncertainty is introduced
Rise and Fall Times < 22 ns
Squarewave Rise and Fall Times < 22 ns
Triangle Linearity error < 0.5 % to 30 kHz
Symmetry Range Sine — 1 % to 99 % at all frequencies
Other waveforms — 1 % to 99 % to 30 kHz, 20 % to 80 % to 10 MHz
Resolution 0.1 %
RS-232 Variable Baud rate, 9600 Baud maximum. 9-pin D-connector.
IEEE-488 Conforming with IEEE488.1 and IEEE488.2
Display 20 character x 4 row alphanumeric LCD
Data entry Keyboard selection of mode, waveform etc.; value entry direct by numeric keys or by rotary control.
Stored settings Up to 9 complete instrument set-ups may be stored and recalled from battery-backed memory.
Size 3U (130 mm) height; half-rack (212 mm) width, 330 mm long
Power 100 V ac, 110 to 120 V ac or 220 to 240 V ac +/– 10 %, 50/60 Hz ac by internal adjustment; 30 VA max.
Operating range +5 °C to 40 °C, 20 to 80 % RH
Options IEEE-488 interface; 19-in rack mounting kit


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