User Manual DDS200 Digital Demodulation System 070-9952-00

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Manual Operation0.0150.010V IQ, actual, fine V IQ, set1000 V IQ, actual, fine, with noise V IQ, set0.0050.000–0.005–0.010–0.0150.86 0.9 0.94 0.98 1.02 1.06 1.1 1.14 1.18V I/Q, setFigure 2–56: Improvement of accuracy with superimposed noise (SNR = 45 dB)In Figure 2–56, the scaling for the gain calculated from the measured valuescontaining noise is increased by a factor of 1000. Thus the resolution for theanalysis is improved by a factor of approximately 1000. The same applies to thecalculation of the other parameters. The background noise is present on everyreal transmission path and results in a drastic improvement of the resolution ofthe calculated parameters. To achieve meaningful results, a sufficiently largenumber of measured I/Q values are needed to form the basis for calculating theparameters in question (law of large numbers). With the DDS200, parametercalculation is based on almost 1,000,000 measured values shown on the display,which affords the necessary confidence level. With this data acquisition rate, atypical refresh rate of results of approximately 1 s is obtained.For calculation of the parameters, there are limit values that are listed inTable 2–5. The limits result from the quantization of the measured I/Q valuesand from the location of the decision fields (their distance from the center point).For each limit value specified, all other interfering quantities are assumed to bezero.DDS200 Digital Demodulation System User Manual 2–73
Manual OperationTable 2–5: Theoretical maximum and minimum values of calculated parameters for various orders of QAMÁÁÁÁÁ Order of AI max PE max C/I max C/I min CS max CS * min SNR max PJ max425441% 90.0° 39.13 dB 3.15 dB 0.14 dB 36.12 dB 46.0 dB 11.26°16dB 37.09 dB ÁÁÁÁ 190.80 % 36.15° 40.10 dB 10.27 dB 7.26 46.0 dB 4.17°ÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁ326461.54 %37.10 %23.06°15.39°37.09 dB 13.57 dB 10.56 dB 34.08 dB 43.0 dB 2.59°ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ40.31 dB 16.79 dB 13.78 dB 37.30 dB 46.0 dB 1.85°ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ12825619.19 %13.34 %9.82°6.73°37.20 dB40.37 dB20.29 dB23.46 dB17.28 dB20.45 dB34.19 dB37.36 dB43.0 dB46.0 dBÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ* With slight noise present in the signal (SNR
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®Established 1981Advanced Test Equ
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Copyright Tektronix, Inc. All righ
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Table of ContentsRemote ControlHard
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Table of ContentsIndexLocal control
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Table of ContentsFigure 2-35: ALARM
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Table of ContentsList of TablesTabl
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Table of ContentsxDDS200 Digital De
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General Safety SummaryProvide Prope
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PrefacexivDDS200 Digital Demodulati
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Preparation for UseFront PanelFront
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Preparation for UseTable 1-1: Legen
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Preparation for UseTable 1-2: Legen
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Preparation for UseUnpacking the Un
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Preparation for UsePositioning the
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Preparation for UsePowering OnConne
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Preparation for UseInitial update -
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Preparation for UseInstalling Optio
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Preparation for Use1-18 DDS200 Digi
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Manual OperationSample SettingThis
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Manual OperationFigure 2-3: MODE me
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Manual OperationPress the RECEIVER
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Manual OperationBasic OperationThe
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Manual OperationFigure 2-7: MEASURE
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Manual OperationSoft KeysThe soft k
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Manual OperationNumeric KeypadSelec
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Manual OperationPresetting the Unit
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Manual OperationFigure 2-14: RECALL
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Manual OperationThe display mode do
Page 61 and 62: Manual OperationFigure 2-18: SETUP:
Page 63 and 64: Manual OperationThe type of printer
Page 65 and 66: Manual OperationOperation as Demodu
Page 67 and 68: Manual OperationFigure 2-24: INPUT:
Page 69 and 70: Manual OperationFigure 2-26: STO: E
Page 71 and 72: Manual Operation84QAM16QAM32QAM64QA
Page 73 and 74: Manual OperationSPECIAL FUNCTION Me
Page 75 and 76: Manual OperationA wide loop bandwid
Page 77 and 78: Manual OperationALARM MenuThis subs
Page 79 and 80: Manual OperationPressing the ALARM
Page 81 and 82: Manual OperationFigure 2-34: ALARM:
Page 83 and 84: Manual OperationThe alarm register
Page 85 and 86: Manual OperationMEASURE MenuThe DDS
Page 87 and 88: Manual OperationFor further informa
Page 89 and 90: Manual OperationConstellation Diagr
Page 91 and 92: Manual OperationFigure 2-42 shows a
Page 93 and 94: Manual OperationQAM Parameters. Whe
Page 95 and 96: Manual OperationNOTE. For reading o
Page 97 and 98: Manual OperationPreset Values and M
Page 99 and 100: Manual OperationTable 2-4: DDS200 P
Page 101 and 102: Manual OperationExamples of Applica
Page 103 and 104: Manual OperationFigure 2-48: Conste
Page 105 and 106: Manual OperationThe magnitude of th
Page 107 and 108: Manual OperationFigure 2-53: Conste
Page 109 and 110: Manual OperationFrequency of occurr
Page 111: Manual OperationFrom the standard d
Page 115 and 116: Manual OperationThe term “modulat
Page 117 and 118: Manual OperationAmplitude N = 2 4 -
Page 119 and 120: Manual OperationBER Measurement wit
Page 121 and 122: Manual Operationare taken into acco
Page 123 and 124: Manual OperationIt should be noted
Page 125 and 126: Manual OperationThe key characteris
Page 127: Manual OperationThe key characteris
Page 130 and 131: Remote Control
Page 132 and 133: Remote ControlIEC/IEEE-Bus Messages
Page 134 and 135: Remote ControlCommon commands. Comm
Page 136 and 137: Remote ControlNumeric suffix:If an
Page 138 and 139: Remote ControlExample: Special n
Page 140 and 141: Remote ControlParameter:In the para
Page 142 and 143: Remote Control*CLS*ESE 0 to 255*ESR
Page 144 and 145: Remote ControlInstrument Model and
Page 146 and 147: Remote ControlOutput UnitThe output
Page 148 and 149: Remote ControlCONDition register. T
Page 150 and 151: Remote ControlOverview of StatusReg
Page 152 and 153: Remote ControlTable 3-2: Definition
Page 154 and 155: Remote ControlTable 3-5: Definition
Page 156: Remote ControlResetting the StatusR
Page 159 and 160: Maintenance and TroubleshootingRepl
Page 161: Maintenance and TroubleshootingTabl
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Appendix A: SpecificationsTable A-1
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Appendix A: SpecificationsTable A-2
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Appendix A: SpecificationsA-6 DDS20
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Appendix B: IEC/IEEE-Bus InterfaceS
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Appendix B: IEC/IEEE-Bus InterfaceT
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Appendix C: List of Error MessagesT
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Appendix C: List of Error MessagesD
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Appendix D: List of CommandsSTATus
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Appendix D: List of CommandsSYSTem
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Appendix D: List of CommandsINPut S
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Appendix D: List of CommandsTable D
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Appendix D: List of CommandsREAD Su
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Appendix D: List of CommandsD-20 DD
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Appendix E: Programming ExamplesSen
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Appendix E: Programming ExamplesSer
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Appendix E: Programming Examples
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Appendix F: Remote Control via RS-2
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IndexHHandshake, RS232, F-5Hard key
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IndexSetting device address, 3-2Set
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User Manual DDS200 Digital Demodulation System 070-9952-00

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