Page 2 - LIMITED WARRANTY AND LIMITATION OF LIABILITY
LIMITED WARRANTY AND LIMITATION OF LIABILITY Each Fluke product is warranted to be free from defects in material and workmanship under normal use and service. The warranty period is one year and begins on the date of shipment. Parts, product repairs, and services are warranted for 90 days. This warr...
Page 3 - Safety; Warning; To avoid the possibility of electric shock:
Safety This function generator is a Safety Class I instrument according to IEC classification and has been designed to meet the re-quirements of EN61010-1 (Safety Requirements for Electrical Equipment for Measurement, Control and Laboratory Use). It is an Installation Category II instrument intended...
Page 4 - Getting Started Manual; Note; Caution; ii
271 Getting Started Manual • The apparatus shall be disconnected from all voltage sources before it is opened for any adjustment, replacement, maintenance or repair. • Any adjustment, maintenance and repair of the opened instrument under voltage shall be avoided as far as possible and, if inevitable...
Page 5 - iii
Safety (continued) The following symbols are used on the instrument and in this manual: Caution - refer to the accompanying documentation, incorrect operation may damage the instrument. Terminal connected to chassis ground. Mains supply OFF. Mains supply ON. Alternating current. Warning - hazardous ...
Page 7 - EMC Compliance; Emissions; Class; Immunity
EMC Compliance This instrument meets the requirements of the EMC Directive 89/336/EEC. Compliance was demonstrated by meeting the test limits of the following standards: Emissions EN61326 (1998) EMC product standard for Electrical Equipment for Measurement, Control and Laboratory Use. Test limits us...
Page 9 - Table of Contents; Title; vii
Table of Contents Title Page Introduction .................................................................................................................... 1 Before You Start ............................................................................................................. 1 Mains Supp...
Page 10 - viii
271 Getting Started Manual AUX OUT ............................................................................................................. 8 EXT TRIG............................................................................................................. 8 Rear Panel Connectors ..............
Page 11 - Getting Started; Introduction; This; Before You Start; Mains Supply Voltage; Users Manual
Getting Started Introduction This Getting Started Manual for the model 271 Programmable 10 MHz DDS Function Generator is designed to provide an initial understanding of the way the instrument is operated. The manual is set out in the form of a tutorial, guiding you through a series of basic front pa...
Page 12 - Externally Applied Voltages; Caution - Front Panel Sockets
271 Getting Started Manual Externally Applied Voltages Caution - Front Panel Sockets To avoid risk of damage to the instrument: Do not apply external voltages to the MAIN OUT or AUX OUT sockets. Do not apply external voltages exceeding ±10 V to the TRIG IN socket. Caution - Rear Panel Sockets To avo...
Page 13 - Controls and Connections; Figure 1. Model 271 Front Panel
Getting Started Controls and Connections Controls and Connections shx0001f.gif Figure 1. Model 271 Front Panel 3
Page 14 - The Liquid Crystal Display; LCD; EDIT; key followed; MODE; then; ENTER; Controls
271 Getting Started Manual The Liquid Crystal Display The 4-line x 20-character LCD panel is used to display and edit all the parameter values. The paradigm used for selecting fields and editing values is described below. If necessary (because of temperature variations etc.), you can adjust the disp...
Page 15 - FIELD and DIGIT Keys and the Rotary Control; kHz
Getting Started Controls and Connections FIELD and DIGIT Keys and the Rotary Control The FIELD keys move the display cursor between fields. The fields in the display shown in figure 1 above are " FREQ= ", " 10.00000 ", " kHz ", " VhiZ =" and so on. shx0004f.gif Each f...
Page 16 - Numeric, Units and SET Keys; FREQ
271 Getting Started Manual Numeric, Units and SET Keys You can use these keys to enter parameter values directly. For example, to set the period to 125 µ s, select the first field ( FREQ ), change it to period ( PER ) by pressing a DIGIT key, then enter 1, 2, 5, us on the keypad. shx0009f.gif If the...
Page 17 - MODE Keys; OUTPUT Key
Getting Started Controls and Connections MODE Keys Alternate presses of a MODE key will turn the mode ( TRIG , GATE , AM , etc.) on or off, and when the function is on the associated lamp is lit. If you press the EDIT key then press a MODE key you will see the edit menu for that mode. The associated...
Page 18 - PHASE; EXT TRIG
271 Getting Started Manual Front Panel Inputs and Outputs MAIN OUT MAIN OUT is the 50 Ω or 600 Ω output from the main generator. It will provide up to 20 V p-p into a high-impedance load or 10 V p-p into a matched 50 Ω or 600 Ω load. It can tolerate a short circuit for 60 seconds. shx0005f.gif AUX O...
Page 19 - Rear Panel Connectors
Getting Started Controls and Connections Rear Panel Connectors CLOCK IN/OUT This socket operates both as an input and as an output, depending on the mode in which the instrument is being used. shx0013f.gif As an input it can be used either to run the instrument from an external master clock or as a ...
Page 20 - RS232 and GPIB Interface Connectors; Getting
271 Getting Started Manual TRIG/SWEEP OUT The TRIG/SWEEP output socket provides both trigger and marker signals, depending on the instrument's mode of operation. shx0016f.gif Its primary use is for triggering an oscilloscope or other recording device, but it can also provide z-axis bright-up markers...
Page 21 - Using the Instrument; MAIN OUT; front panel socket to the oscilloscope's Y input, and the; AUX OUT; front panel socket to the oscilloscope's trigger; Starting up; Plug in and switch on the instrument
Getting Started Using the Instrument Using the Instrument While familiarizing yourself with the instrument you will find it useful to observe the outputs on an oscilloscope. For most purposes it is sufficient to connect the MAIN OUT front panel socket to the oscilloscope's Y input, and the AUX OUT f...
Page 22 - Generating Continuous Signals
271 Getting Started Manual Generating Continuous Signals Select SINE on the function keys, if it is not already selected. If there is no signal at the oscilloscope input it will almost certainly be because the generator's output is switched off. If the lamp next to the MAIN OUT socket is not lit, pr...
Page 23 - Set the amplitude to +10 dBm; AMPL; VhiZ; Have a look at some other waveforms; DC OFFSET
Getting Started Using the Instrument Set the amplitude to +10 dBm You can do this by keying AMPL , 1 , 0 , dBm . The display will now look like this: PER =80.00000us OUT =+10.0dBm 50 Ω DC=+0.00mV (+0.00mV) SYM=50.0% (50.0%) If you switch the amplitude display back to VhiZ you should see: PER =80.000...
Page 24 - Effect of the output attenuator; Now change the amplitude by pressing
271 Getting Started Manual Effect of the output attenuator The instrument has an output attenuator with fixed steps of 20 dB. The attenuator follows the output stages so any dc offset added to the waveform is subject to the attenuator. With the waveform amplitude set to 4 V p-p the attenuator is swi...
Page 25 - Asymmetric waveforms; Specifications; Adjusting the phase
Getting Started Using the Instrument Asymmetric waveforms Symmetry adjustments work in much the same way as dc offset adjustments. However, because of the lengthy calculations which the instrument makes following a change to the symmetry setting, you may find it easier to use direct numeric entry ra...
Page 26 - Generating Swept Signals; RECALL
271 Getting Started Manual instrument's AUX OUT socket in order to see the phase effects more clearly. There are some limitations on using the phase control at frequencies above 30 kHz - chapter 5 of the Users Manual explains these in detail. Generating Swept Signals The instrument has an independen...
Page 28 - Generating a Triggered Burst; FREE
271 Getting Started Manual Generating a Triggered Burst In this exercise you will use the internal trigger generator to initiate a burst of 500 cycles of a 2 kHz tone twice every second. The period of the internal trigger generator is thus 500 ms. Press RECALL , 0 , ENTER to reset to the factory def...
Page 29 - FSK Mode; Press; and enter the settings shown here:; FSK; again to start the generator with the new; Special Waveforms
Getting Started Using the Instrument FSK Mode The FSK (frequency shift keying) mode can also be driven from the internal trigger generator. Setting up is very straightforward; the following settings give a continuous waveform which switches between 800 Hz and 1.2 kHz twice every second. The edit men...
Page 30 - Our line signal thus looks like the drawing below:
271 Getting Started Manual set the levels to produce five monochrome stripes from left to right: grey, white, grey, black and grey again. Our line signal thus looks like the drawing below: shx0019f.gif Figure 2. 625-line PAL TV Signal In the instrument the number of horizontal points which make up t...
Page 32 - to complete this part of the set-up. You; STAIR
271 Getting Started Manual The second screen appears: VALS=ABS AUTO=YES STEP=01 ACTIVE LENGTH=0256 LEVEL=+000 Continue entering the pairs of length and level values in the table until the last step (08). This is the final screen in which the length and level have been keyed in, immediately before th...
Page 33 - Saving and Recalling Settings; STORE; key, followed by a number in the range 1 to 9; key. Store 0 is reserved for the factory; Arbitrary Waveforms; then the; ARB
Getting Started Using the Instrument Saving and Recalling Settings Having done all this work it would be wise to save the settings for future use. You can do this simply by pressing the STORE key, followed by a number in the range 1 to 9 and the ENTER key. Store 0 is reserved for the factory default...
Page 34 - Other Functions and Waveforms
271 Getting Started Manual arbitrary waveforms 01 to 05. These first five store locations are available for waveforms downloaded from a PC. When you press the ENTER key the output switches to the selected waveform but the display does not change; press ESCAPE to return to the main menu, then press A...
