Fluke 271 manual The Liquid Crystal Display, Controls, Function Keys

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The Liquid Crystal Display

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 display contrast using a small screwdriver or trimmer tool inserted in the hole marked LCD.

At power-up the instrument goes through a self-test cycle and the display shows the firmware revision number for a few seconds. If any tests fail, the display will show a message indicating the nature of the fault; if this happens, refer to the Users Manual.

The display shown above is called the "main menu" and shows the frequency (or period), amplitude, dc offset and symmetry of the waveform. Other menus, called "edit menus", are called when you press the EDIT key followed by a MODE key.

If the main menu display is not as shown in figure 1 above then you should reset all settings to their factory defaults. Do this by pressing RECALL, then the numeric 0 key, then ENTER.

Controls

Function Keys

These three keys are used to choose between the basic waveforms: sine, square and triangular waves, and pulses and ramps of either polarity.

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Repeated presses of a key will cycle the selection through the two or three choices offered. The associated LED will light.

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Contents Getting Started Manual Programmable 10 MHz DDS Function GeneratorLIMITED WARRANTY AND LIMITATION OF LIABILITY To register your product online, visit register.fluke.comSafety Getting Started Manual Terminal connected to chassis ground Mains supply OFF Mains supply ON Safety continuedThe following symbols are used on the instrument and in this manual Alternating current Warning - hazardous voltages may be presentPage Immunity EMC ComplianceEmissions e EN61000-4-5 1995 Surge 0.5 kV line to line, 1 kV line to ground Table of Contents Titleviii AUX OUTBefore You Start Getting StartedIntroduction Mains Supply VoltageExternally Applied Voltages Figure 1. Model 271 Front Panel Controls and ConnectionsGetting Started shx0001f.gifFunction Keys The Liquid Crystal DisplayControls FIELD and DIGIT Keys and the Rotary Control Numeric, Units and SET Keys OUTPUT Key MODE KeysUTILITIES Keys RECALL and REMOTEMAIN OUT Front Panel Inputs and OutputsEXT TRIG AUX OUTVCA IN Rear Panel ConnectorsCLOCK IN/OUT SYNC OUTRS232 and GPIB Interface Connectors TRIG/SWEEP OUTStarting up Using the InstrumentPlug in and switch on the instrument Check the LCD DisplayFREQ=12.50000kHz VhiZ=+20.0 Vpp 50Ω DC=+0.00mV +0.00mV Generating Continuous SignalsSet a frequency, for example 12.5 kHz SYM=50.0% 50.0%Change the dc offset Set the amplitude to +10 dBmHave a look at some other waveforms =80.00000usPER =80.00000us VhiZ=+4.00 Vpp 50Ω DC=+1.50 V +151.mV SYM=50.0% 50.0% Effect of the output attenuatorDC OFFSET CHANGE * * BY OUTPUT LEVEL SOURCE=EXT TGEN=1.00ms 1.000kHz BURST COUNT= PHASE=+116 +116 Adjusting the phaseSOURCE=EXT TGEN=1.00ms 1.000kHz BURST COUNT= PHASE=+000 +000 Asymmetric waveformsGenerating Swept Signals TRIG/SWEEP OUT signalBEG FRQ=261.6000 Hz END FRQ=1.108700kHz MARK FRQ=523.3000 Hz MORE MODE=BEG-END LAW=LOG RAMP TIME=0.05 s TRIG SRC=CONTINUOUS MOREMODE=BEG-END LAW=LOG RAMP TIME=5.00 s TRIG SRC=CONTINUOUS MORE Generating a Triggered Burst SOURCE=EXT TGEN=1.00ms 1.000kHz BURST COUNT=0001 PHASE=+000 +000PHASE=+000 +000 FREQ=2.000000kHz VhiZ=+20.0 Vpp 50Ω DC=+0.00mV +0.00mVStaircases FSK ModeSpecial Waveforms FREQ A=800.0000 Hz FREQ B=1.200000kHz SOURCE=TGEN FREEFigure 2. 625-line PAL TV Signal start µs stepname amplitudeVALS=ABS AUTO=YES STEP=01 ACTIVE LENGTH=0256 LEVEL=+000 VALS=ABS AUTO=YES STEP=08 ACTIVE LENGTH=0005 LEVEL=+153RECALL ARB No SINX/X ENTER TO EXECUTE Saving and Recalling SettingsArbitrary Waveforms RECALL ARB No ARB 03 IS EMPTYOther Functions and Waveforms