Phase Modulation PM, To Select PM | Agilent Technologies U2761A

Features and Functions

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Phase Modulation (PM)

A modulated waveform consists of a carrier waveform and a modulating waveform. The following figure shows an example of a PM waveform. PM is very similar to FM, but in PM, the phase of the modulated waveform is varied by the instantaneous voltage of the modulating waveform. The variation in phase of the modulated waveform from the carrier waveform is called the phase deviation.

Modulating frequency

Phase deviation

Figure 2-19 PM waveform

To Select PM

The U2761A allows only one modulation mode to be enabled at a time. The U2761A does not allow PM to be enabled at the same time that sweep is enabled.

U2761A User’s Guide

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Agilent Technologies U2761A manual Phase Modulation PM, To Select PM, Modulating frequency Phase deviation

Contents

User’s Guide U T I O N WA R N I N G Safety Symbols Use the device with the cables provided InstrumentPerformed by qualified personnels Environment Conditions Regulatory Markings Affixed product label is shown as below Product Category 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 Introduction Various features of the U2761A Bumpers Product at a GlanceProduct Outlook Top View Rear View Fan Ventilation Pin backplane connector USB inletPower inlet Front View 25.00 mm Product DimensionsDimensions Without Bumpers 105.00 mm 175.00 mm 18.00 mm 117.00 mm 180.00 mm 15.00 mm Dimensions With Bumpers41.00 mm Standard Purchase Items Electrical Check Inspection and MaintenanceGeneral Maintenance Initial Inspection Installation Installation and ConfigurationWith Agilent VEE Pro, LabVIEW, or Microsoft Visual Studio Hard-disk space 1 GB Check Your System Install the IO Libraries Suite Install the Module Driver Install the Agilent Measurement Manager T E Proceeding Connect the Module to Your PC Getting Started Go to Start Control Panel and double-clickSystem Select Ignore to disable the warning message Getting Started Verify Your Module Connection Send Commands To This Instrument Launch Your Agilent Measurement Manager IO Control will launch automatically when you start your PC T E Description Pin Backplane Connector Pin Configuration Chassis Installation Triggering Pulse Waveform 1Output functions Output ConfigurationIntroduction Output Function Amplitude Limitation Function Limitation Waveform pattern selection Waveform parameters Soft Front Panel Operation Remote Interface Operation Output Frequency2Output frequency range Duty Cycle Limitations Function Limitations Offset Voltage Limitations Output AmplitudeLimits Due to Output Termination 4Panel view of the amplitude section Limits Due to Units Selection Limits Due to Amplitude DC Offset Voltage VOLTageOFFSet offset Output Units Output Termination OUTPutLOAD ohmsINFinity Duty Cycle Duty Cycle Square WavesLimits Due to Frequency APPLy command automatically sets the duty cycle to 50% 9Ramp wave duty cycles Symmetry Ramp Wave 11Panel view of the output section Output Control Example 1, To output a DC voltage Set Output Using Scpi Commands Example 2, To output a Sine wave Example 4, To output a Ramp wave Pulse Period Pulse Waveform 13Panel view of the pulse width section Pulse Width Duty Cycle = 100 ⋅ Pulse Width / Period Pulse Duty Cycle Example Generate Pulse Waveform Using Scpi Commands To Select AM Amplitude Modulation AMModulating frequency AM depth 15Panel view of AM Carrier Waveform 3Carrier frequency for AM Carrier Frequency Modulating Waveform Default modulating waveform is Sine wave Modulation Depth Modulating Waveform FrequencyPeak into a 50 Ω load Generate AM Using Scpi Commands To Select FM Frequency Modulation FMModulating frequency FM deviation FMSTATe 0OFF1ON 4Carrier frequency for FM FMINTernalFUNCtion SINusoidSQUareRAMPNRAMpTRIangleUSER Frequency Deviation Generate FM Using Scpi Commands Modulating frequency Phase deviation Phase Modulation PMTo Select PM PMSTATe 0OFF1ON 5Carrier frequency for PM Default waveform is Sine wave Generate PM Using Scpi Commands Phase Deviation To Select FSK Modulation Frequency-Shift Keying FSK ModulationFSK rate Hop frequency FSKeySTATe 0OFF1ON 6Carrier frequency for FSK FSK Carrier Frequency 7Hop frequency FSK Hop Frequency FSK Rate Generate FSK Modulation Using Scpi Commands To Select PSK Modulation Phase-Shift Keying PSK ModulationPSK rate PSK deviation PSKeySTATe 0OFF1ON 8Carrier frequency for PSK PSK Carrier Frequency PSK Deviation PSK Rate Generate PSK Modulation Using Scpi Commands To Select ASK Modulation Amplitude-Shift Keying ASK ModulationASK rate ASKeySTATe 0OFF1ON 9Carrier frequency for ASK ASK Rate Generate ASK Modulation Using Scpi Commands To Select Sweep Frequency SweepFrequency Linear type Start frequency Stop frequency 28Panel view of sweep Start Frequency and Stop Frequency Sweep Time Sweep Mode Sweep Trigger Source Set Frequency Sweep Using Scpi Commands Trigger Source Choices Triggering Manual Triggering Internal Triggering External Triggering Trigger out 500 μs Rising edge shown Trigger Input SignalTrigger Output Signal Trigger Rising edge shown OUTPutTRIGger 0OFF1ON OUTPutTRIGgerSLOPe POSitiveNEGative Set Triggering Using Scpi Commands To Create and Store an Arbitrary Waveform Arbitrary Waveforms Select the Arbitrary waveform function Start waveform editing process Exiting the waveform editor Characteristics and Specifications Operating Environment Product Characteristics Waveforms Product Specifications and Characteristics Ramp, Triangle ±5 V across open circuit Units Vpp, Vrms, dBm Resolution DigitsExternal frequency reference ±1% of settling ±5 mV ±10 mV @ Hi-Z Modulation Sweep Characteristics 102 U2761A User’s Guide Index PSK United States Tel 800 829