Limits Due to Units Selection | Agilent Technologies U2761A manual

2 Features and Functions

Limits Due to Units Selection

In some cases, the amplitude limits are determined by the output units selected. This may occur when the units are Vrms or dBm due to the differences in crest factor for the various output functions.

For example, if you output a 2.5 Vrms Square wave (into 50 Ω) and then change to the Sine wave function, the U2761A will automatically adjusts the output amplitude to 1.768 Vrms (the upper limit for Sine wave in Vrms).

You can set the output amplitude in Vpp, Vrms, or dBm. For more information, see “Output Units” on page 35.

You cannot specify the output amplitude in dBm if the output termination is set to “high impedance”.

Soft Front Panel Operation

On the Amplitude panel as shown in Figure 2- 4, input the desired amplitude value and select the unit from the drop down list.

Figure 2-4Panel view of the amplitude section

32	U2761A User’s Guide

Image 50

Agilent Technologies U2761A manual Limits Due to Units Selection, 4Panel view of the amplitude section

Contents

User’s Guide U T I O N WA R N I N G Safety Symbols Performed by qualified personnels InstrumentUse the device with the cables provided Environment Conditions Regulatory Markings Product Category Affixed product label is shown as below Declaration of Conformity Regulatory Information for Australia/New Zealand This Guide… Contents Output Control Sweep Time Index List of Figures Trigger output pulse List of Tables Xviii Getting Started Various features of the U2761A Introduction Top View Product at a GlanceProduct Outlook Bumpers Front View Fan Ventilation Pin backplane connector USB inletPower inlet Rear View 105.00 mm 175.00 mm 18.00 mm Product DimensionsDimensions Without Bumpers 25.00 mm 41.00 mm Dimensions With Bumpers117.00 mm 180.00 mm 15.00 mm Standard Purchase Items Initial Inspection Inspection and MaintenanceGeneral Maintenance Electrical Check With Agilent VEE Pro, LabVIEW, or Microsoft Visual Studio Installation and ConfigurationInstallation Check Your System Hard-disk space 1 GB Install the IO Libraries Suite Install the Module Driver Install the Agilent Measurement Manager T E Connect the Module to Your PC Proceeding Getting Started Select Ignore to disable the warning message Go to Start Control Panel and double-clickSystem Getting Started Verify Your Module Connection Send Commands To This Instrument IO Control will launch automatically when you start your PC Launch Your Agilent Measurement Manager T E Pin Backplane Connector Pin Configuration Description Chassis Installation Pulse Waveform Triggering Output Function Output ConfigurationIntroduction 1Output functions Function Limitation Amplitude Limitation Soft Front Panel Operation Waveform pattern selection Waveform parameters 2Output frequency range Output FrequencyRemote Interface Operation Function Limitations Duty Cycle Limitations Limits Due to Output Termination Output AmplitudeOffset Voltage Limitations Limits Due to Units Selection 4Panel view of the amplitude section DC Offset Voltage Limits Due to Amplitude VOLTageOFFSet offset Output Units Output Termination OUTPutLOAD ohmsINFinity Limits Due to Frequency Duty Cycle Square WavesDuty Cycle APPLy command automatically sets the duty cycle to 50% Symmetry Ramp Wave 9Ramp wave duty cycles Output Control 11Panel view of the output section Set Output Using Scpi Commands Example 1, To output a DC voltage Example 2, To output a Sine wave Example 4, To output a Ramp wave Pulse Waveform Pulse Period Pulse Width 13Panel view of the pulse width section Pulse Duty Cycle Duty Cycle = 100 ⋅ Pulse Width / Period Generate Pulse Waveform Using Scpi Commands Example Modulating frequency AM depth Amplitude Modulation AMTo Select AM Carrier Waveform 15Panel view of AM Carrier Frequency 3Carrier frequency for AM Default modulating waveform is Sine wave Modulating Waveform Peak into a 50 Ω load Modulating Waveform FrequencyModulation Depth Generate AM Using Scpi Commands Modulating frequency FM deviation Frequency Modulation FMTo Select FM FMSTATe 0OFF1ON 4Carrier frequency for FM FMINTernalFUNCtion SINusoidSQUareRAMPNRAMpTRIangleUSER Frequency Deviation Generate FM Using Scpi Commands To Select PM Phase Modulation PMModulating frequency Phase deviation PMSTATe 0OFF1ON 5Carrier frequency for PM Default waveform is Sine wave Phase Deviation Generate PM Using Scpi Commands FSK rate Hop frequency Frequency-Shift Keying FSK ModulationTo Select FSK Modulation FSKeySTATe 0OFF1ON FSK Carrier Frequency 6Carrier frequency for FSK FSK Hop Frequency 7Hop frequency Generate FSK Modulation Using Scpi Commands FSK Rate PSK rate PSK deviation Phase-Shift Keying PSK ModulationTo Select PSK Modulation PSKeySTATe 0OFF1ON PSK Carrier Frequency 8Carrier frequency for PSK PSK Rate PSK Deviation Generate PSK Modulation Using Scpi Commands ASK rate Amplitude-Shift Keying ASK ModulationTo Select ASK Modulation ASKeySTATe 0OFF1ON 9Carrier frequency for ASK Generate ASK Modulation Using Scpi Commands ASK Rate Frequency Linear type Start frequency Stop frequency Frequency SweepTo Select Sweep Start Frequency and Stop Frequency 28Panel view of sweep Sweep Mode Sweep Time Sweep Trigger Source Set Frequency Sweep Using Scpi Commands Triggering Trigger Source Choices Internal Triggering Manual Triggering External Triggering Trigger Rising edge shown Trigger Input SignalTrigger Output Signal Trigger out 500 μs Rising edge shown OUTPutTRIGger 0OFF1ON OUTPutTRIGgerSLOPe POSitiveNEGative Set Triggering Using Scpi Commands Arbitrary Waveforms To Create and Store an Arbitrary Waveform Select the Arbitrary waveform function Start waveform editing process Exiting the waveform editor Characteristics and Specifications Product Characteristics Operating Environment Product Specifications and Characteristics Waveforms Ramp, Triangle ±1% of settling ±5 mV ±10 mV @ Hi-Z Units Vpp, Vrms, dBm Resolution DigitsExternal frequency reference ±5 V across open circuit Modulation Sweep Characteristics 102 U2761A User’s Guide Index PSK United States Tel 800 829