N5161A/62A/81A/82A/83A MXG Signal Generators User's Guide

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Basic Digital Operation (Option 651/652/654)Scaling a WaveformSetting Waveform ScalingWaveform scaling differs from waveform runtime scaling in that it permanently affects waveform dataand only applies to waveform segments stored in BBG media. You scale the waveform either up ordown as a percentage of the DAC full scale (100%). If you scale your waveforms using this method,you may also need to change the waveform runtime scaling value to accommodate this scaling.When you scale, the signal generator permanently modifies the waveform file’s sample values so thatthey conform to the desired scaling value. When you initiate scaling, the signal generator performsthe following actions:• locates the waveform file’s absolute peak sample value• determines its current percentage of full scale• calculates the ratio of the desired scale value to the determined absolute peak sample scale value• multiplies each sample in the waveform file by this ratioPeak sampleDAC full scale 100%= Samples85% of full scale—Prescaling60% of full scale–Post scalingOriginal ramp waveformScaled ramp waveformScaled sample value = scaling ratio × prescale sample valScaling ratio = desired scale val / current scale val= 60 / 85= 0.70588Each sample in the waveform is multiplied by 0.70588 toreach the 60% post scaling waveform amplitude.When you scale a waveform, you can create fractional data, lose data, or both. Fractional data occursalmost every time you reduce or increase the scaling value, and causes quantization errors.Quantization errors are more noticeable when scaling down, since you are closer to the noise floor.You lose data when either the signal generator rounds fractional data down or the scaling value isderived using the results from a power of two. This means that scaling a waveform in half (power oftwo: 2 1 = 2) causes each waveform sample to lose one bit. The waveform data modifications are notcorrectable and may cause waveform distortion. It is always best to make a copy of the original fileprior to applying scaling.Use the following examples to apply waveform scaling to a waveform file. While this process uses thefactory–supplied waveform RAMP_TEST_WFM, it is the same for any waveform file.Copy a Waveform File1. Display the waveform files in BBG media: Press File > Catalog Type > More > Volatile Segments.2. Highlight the waveform RAMP_TEST_WFM.3. Press Copy File.4. Name the copy (this example uses the name MY_TEST_SCAL) and press Enter.192 Agilent N5161A/62A/81A/82A/83A MXG Signal Generators User’s Guide
Basic Digital Operation (Option 651/652/654)Scaling a WaveformApply Scaling to the Copied Waveform FileCAUTIONThis type of scaling is non–reversible. Any data lost in the scaling operation cannot berestored. Save a copy of the waveform file before scaling.1. Open the DUAL ARB Waveform Utilities menu:Press Mode > Dual ARB > More > Waveform Utilities.2. In the list of BBG Media segment files, highlight the copied file (in this example, MY_TEST_SCAL).3. Set and apply a scaling value (in this example 70% scaling is applied):Press Scale Waveform Data > Scaling > 70 > % > Apply to Waveform.Agilent N5161A/62A/81A/82A/83A MXG Signal Generators User’s Guide 193
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Agilent TechnologiesN5161A/62A/81A/
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1 Signal Generator OverviewContents
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ContentsModulating the Carrier Sign
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ContentsClearing Marker Points from
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ContentsStoring a Custom Multicarri
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ContentsxiiAgilent N5161A/62A/81A/8
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SCPI Reference • SCPI Basics• B
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Signal Generator OverviewSignal Gen
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Signal Generator OverviewModes of O
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Signal Generator OverviewFront Pane
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Signal Generator OverviewBlank Fron
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Signal Generator OverviewRear Panel
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Setting Preferences & Enabling Opti
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Basic OperationPresetting the Signa
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Basic OperationEntering and Editing
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Basic OperationSetting Frequency an
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Basic OperationConfiguring a Swept
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Basic OperationModulating the Carri
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Basic OperationWorking with FilesFi
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Basic OperationWorking with FilesVi
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Basic OperationWorking with FilesLo
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Basic OperationWorking with FilesWo
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Basic OperationWorking with FilesRe
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Basic OperationReading Error Messag
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Using Analog Modulation (Option UNT
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Using Analog Modulation (Option UNT
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Optimizing PerformanceUsing the Dua
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Optimizing PerformanceUsing Flatnes
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Optimizing PerformanceUsing Interna
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Optimizing PerformanceUsing I/Q Mod
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Optimizing PerformanceUsing Externa
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Optimizing PerformanceUsing Unlevel
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Optimizing PerformanceUsing Unlevel
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Optimizing PerformanceUsing an Outp
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Optimizing PerformanceUsing an Outp
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Optimizing PerformanceUsing Free Ru
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Optimizing PerformanceUsing LXI (Op
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Optimizing PerformanceUsing a USB K
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Using Pulse Modulation (Option UNU
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Basic Digital Operation—No BBG Op
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Basic Digital Operation—No BBG Op
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Basic Digital Operation (Option 651
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Adding Real-Time Noise to a Signal
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Real-Time Phase Noise Impairments (
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Custom Digital Modulation (Option 4
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Multitone and Two-Tone Waveforms (O
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Working in a Secure EnvironmentUnde
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Working in a Secure EnvironmentRemo
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Working in a Secure EnvironmentRemo
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Working in a Secure EnvironmentUsin
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TroubleshootingDisplayDisplayThe Di
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TroubleshootingRF OutputSignal Loss
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TroubleshootingSweepSweepCannot Tur
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TroubleshootingError MessagesError
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TroubleshootingSelf Test OverviewSe
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TroubleshootingLicensesLicensesNOTE
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TroubleshootingContacting Agilent T
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stored.IP Internet protocol. The ne
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332 Agilent N5161A/62A/81A/82A/83A
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IndexArb Segment softkey, 69Arb Seq
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Indexdifferential encoding, 287diff
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Indexdefinition, 329gaussian filter
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IndexMonochrome softkey, 26MSK soft
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Indexrear panelI/Q outputs, 199over
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Indextime- based license, 28, 326Ti
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Index346 Agilent N5181A/82A MXG Sig
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N5161A/62A/81A/82A/83A MXG Signal Generators User's Guide

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