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Fluke 271 DDS High Performance Fuction Generator with ARB
 
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Fluke 271 DDS High Performance Fuction Generator with ARB

The Fluke 271 high performance function generator utilizes Direct Digital Synthesis techniques.

 

A wide range of standard waveforms are provided and an arbitrary waveform capability enables it to be used to generate unconventional and user defined waveforms. A wide range of modulation capabilities make it a highly versatile signal source.  

  • 10 MHz DDS High stability function generator
  • Arbitrary capability which stores five user defined waveforms
  • Multiple complex and standard waveforms from internal memory recall
  • Extensive modulation capabilities include Gating, sweep, Trigger/Burst, AM, Hop and FSK
  • RS-232 and GPIB interfaces 

Standard Waveforms

  • Sine
  • Square
  • Positive pulse
  • Negative pulse
  • Triangle
  • Ramp up and ramp down

 

Arbitrary Waveforms

  • Multi level square waves
  • Waveform hopping
  • Pseudorandom noise

 

DDS for stability and accuracy

Direct digital synthesis is a digital waveform generating technique which uses a phase accumulator, DAC, and a look up table. The stability and accuracy of the waveforms is related to that of the crystal master clock. The DDS generator delivers not only stability and exceptional accuracy but also low phase noise, high spectral purity, and excellent frequency agility.

 

A wide range of waveforms

High quality square, sine, and pulse waveforms over the entire frequency range of 0.1 mHz to 10 MHz.

Variable symmetry and duty cycle available for all waveforms.

Maximum of five arbitrary waveforms of 1024 10 bit words can be stored in non volatile memory.

Waveform clock is 27.48 MHz maximum.

Complex waveforms pre defined in ROM including sine x/x, exponential rise and fall, and decaying sine wave.

 

Locked generators

The signals from the Sync Out and the Clock In/Out socket can be used to phase lock two or more generators. Utilizing this feature you can generate locked or multi phase waveforms of different frequencies.

 

Powerful modulation modes

All waveforms can be swept over their entire frequency range at a rate variable between 15 minutes and 10 milliseconds. The sweep is fully phase continuous. Sweep can be logarithmic or linear, continuous or single. Single sweeps can be triggered from the trigger input, the front panel, or the digital interfaces.

Two sweep markers are provided, which are adjustable while the sweep is operating. The markers provide a visual indication of frequency points on a chart recorder or an oscilloscope.

 

Amplitude modulation for all waveforms is variable in 1 percent steps, up to 100 percent.

 

FSK

Frequency shift keying provides phase coherent switching between two selected frequencies at a rate defined by the switching signal source. The rate can be set from dc to 50 kHz internally, or dc to 1 MHz externally.

 

Trigger/Burst

All waveforms are available as a triggered burst, whereby each positive edge of the trigger signal will produce one burst of the carrier, starting and stopping at the phase angle specified by the start stop phase setting. The number of cycles in the burst can be set between 0.5 and 1023.

 

Gated

The gated mode turns the output signal on when the gating signal is high and off when it is low. Both triggered and gated modes can be operated from the internal trigger generator (0.005 Hz to 50 kHz) or from an external source (dc to 1 MHz).

 

Waveform hop

The generator can be set up to ‘hop’ between a number of different waveform setups, either at a pre determined rate or in response to a manual or bus trigger. Up to 16 different hop waveforms can be defined in terms of amplitude, frequency, function, duration and offset, which is variable in 1 ms steps up to 60 seconds.

 

The Fluke 271 can also be set to simulate wide band random noise with adjustable amplitude and offset.

 
 
Waveforms
Frequency
  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 frequencies indicated in the following section.
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
Squarewave
Rise and fall times < 22 ns
Triangle
Linearity error < 0.5 % to 30 kHz
Positive and Negative Ramp
Linearity error < 0.5 % to 30 kHz
Positive and Negative Pulse
Rise and fall times < 22 ns
Multi-Level Squarewave
  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 36 ns edge uncertainty is introduced.
Rise and fall times < 22 ns
Arbitrary (and complex)
  A number of “complex” waveforms are pre-programmed in ROM . A further five, user defined, waveforms may be loaded via the digital interfaces and stored in non-volatile RAM. Frequency range: All waveform points can be continuously output up to 27 kHz, beyond which they are sampled.
No. of samples 1024 10 bit samples
Noise Wideband noise with variable amplitude and offset.
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 %

Main Output
Output impedance
  50 Ω or 600 Ω switchable
Amplitude
  5 mV to 20 V pk-pk open circuit (2.5 mV to 10 V into 50 Ω/600 Ω). Output can be specified as V-H: 2
  (open circuit value) or V (Voltage into the characteristic impedance) in pk-pk, RMS or dBm.
  Note that in positive or negative pulse modes the amplitude range is 2.5 mV to 10 V pk-pk O/C.
Accuracy
  Typically ±3 % ±1 mV at 1 kHz into 50 Ω/600 Ω
Flatness
  ±0.2 dB to 500 kHz; ±1 dB to 10 MHz
Pulse aberrations
  <5 %+ 2 mV
DC offset
  ± 10 V from 50Ω/600 Ω offset plus signal peak limited to ± 10 V from 50 Ω/600 Ω
Resolution
  3 digits or 1 mV for both amplitude and offset

Modulation
Amplitude Modulation
Carrier frequency 0.1 mHz to 10 MHz
Carrier waveforms All
Depth 0 to 100 %, resolution 1 %
Internal source 1 kHz fixed sinewave or 0.005 Hz to 50 kHz square wave
External See “VCA In” section
Frequency Shift Keying (FSK)
  Phase coherent switching between two frequencies at a rate defined by the switching signal source
Carrier frequency 0.1 mHz to 10 MHz
Carrier waveforms All
Switch repetition rate dc to 50 kHz internal, dc to 1 MHz external
Switching signal source. Internal from keyboard or trigger generator. External from EXT TRIG input or remote interface

Operating Modes
Trigger/burst
  Phase coherent signal keying — each positive edge of the trigger signal will produce one burst of the carrier, starting and stopping at the phase angle specified by the start/stop phase setting
Carrier frequency 0.1 mHz to 10 MHz
Carrier waveforms All
Number of cycles 1 to 1023 (resolution 1 cycle) or 0.5 to 511.5 (resolution 1/2 cycle)
Trigger rep. rate dc to 50 kHz internal, dc to 1 MHz external
Source Internal from keyboard or trigger generator. External from EXT TRIG input or remote interface
Gated
  Non phase-coherent signal keying — output is On while Gate signal is high and Off while low.
Carrier frequency From 0.1 mHz to 10 MHz
Carrier waveforms All
Trigger rep. rate dc to 50 kHz internal dc to 1 MHz external
Gate source Internal from keyboard or trigger generator. External from EXT TRIG input or remote interface
Sweep
Carrier waveforms All
Sweep mode Linear or logarithmic, single or continuous
Sweep width 0.1 mHz to 10 MHz. Phase continuous. Independent setting of the start and stop frequency.
Sweep time 10 ms to 999 s (3 digit resolution)
Markers Two markers variable during sweep. Available at the TRIG/SWEEP OUT socket
Sweep trigger source The sweep may be free run or triggered from: keyboard, EXT TRIG input, remote interface
Hop
  Up to 16 different “hop” waveforms can be defined in terms of function, frequency, amplitude, offset and duration. Duration setable per step 1 ms to 60 s.
Start/Stop Phase
Carrier frequency 0.1 mHz to at least 1 MHz
Carrier waveforms All
Range –360 to +360 degrees
Resolution 1 degree
Accuracy Typically 1 degree to 30 kHz
Trigger Generator
  Internal source 0.005 Hz to 50 kHz squarewave adjustable in 20 us steps. 3 digit resolution. Available for external use from TRIG/SWEEP OUT socket.

Auxiliary Outputs
Aux Out
  CMOS/TTL levels with symmetry and frequency of main output and phase of start-stop phase setting
Trig/Sweep Out
  Multi-function output depending upon mode. Except in sweep mode, the output is that of the trigger generator at CMOS/TTL levels from 1 kW.
  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.

Inputs
Ext Trig
Frequency range DC to 1 MHz
Signal range TTL (1.5 V) threshold; maximum input ± 10 V
Min. pulse width 50 ns
VCA In
Frequency range DC - 100 kHz
Signal range 2.5 V for 100 % level change at maximum output
Input impedance Typically 6 kΩ

Phase Locking
Clock in/out
  TTL/CMOS threshold levels; output impedance typically 50 Ω as an output
Sync out
  TTL/CMOS logic levels from typically 50 Ω. The signals from these sockets are used to phase lock two or more generators.

Interfaces
RS-232
  Variable Baud rate, 9600 Baud maximum. 9-pin D-connector.
IEEE-488
  Conforming with IEEE488.1 and IEEE488.2

General Specifications
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
Weight
  4.1 kg (9 lb)
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
Storage range
  –20 °C to +60 °C
Options
  IEEE-488 interface; 19-in rack mounting kit

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