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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.
Waveforms
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. |
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Fluke 271
Specifications |
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Waveforms |
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Frequency |
Range |
0.1 mHz to 10 MHz |
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Resolution |
7 digits or 0.1 mHz |
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Accuracy |
Typically < ±10 ppm for 1 year, 18 °C to 28 °C |
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Tempco. |
Typically < 1 ppm/°C outside 18 °C to 28 °C |
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Sinewave |
Distortion |
< –60 dBc to 20 kHz, < –50 dBc to 300
kHz, < -35 dBc to 10 MHz |
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Spurii |
Non -harmonically related spurii typically <- 60 dBc to 10
MHz |
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Positive and Negative Linearity error |
Ramp |
< 0.5 % to 30 kHz |
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Pulse |
< 22 ns |
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Arbitrary (and complex) |
# of samples |
1024 10 bit samples |
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Noise |
Wideband noise with variable amplitude and offset. |
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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 |
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Rise and Fall Times |
< 22 ns |
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Squarewave |
Rise and Fall Times |
< 22 ns |
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Triangle |
Linearity error |
< 0.5 % to 30 kHz |
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Symmetry |
Range |
Sine — 1 % to 99 % at all frequencies |
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Other waveforms — 1 % to 99 % to 30 kHz, 20 % to 80 % to 10
MHz |
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Resolution |
0.1 % |
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Interfaces |
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RS-232 |
Variable Baud rate, 9600 Baud maximum. 9-pin D-connector.
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IEEE-488 |
Conforming with IEEE488.1 and IEEE488.2 |
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General |
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Display |
20 character x 4 row alphanumeric LCD |
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Data entry |
Keyboard selection of mode, waveform etc.; value entry direct
by numeric keys or by rotary control. |
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Stored settings |
Up to 9 complete instrument set-ups may be stored and
recalled from battery-backed memory. |
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Size |
3U (130 mm) height; half-rack (212 mm) width, 330 mm long |
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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. |
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Operating range |
+5 °C to 40 °C, 20 to 80 % RH |
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Options |
IEEE-488 interface; 19-in rack mounting kit |
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