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Fluke-271

Fluke-271

FLUKE-271

271 DDS Function Generator with ARB

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

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.