User Manual DDS200 Digital Demodulation System 070-9952-00

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Manual OperationFigure 2–27: STATUS menuSAW FILTER. The DDS200 has three slots for accommodating SAW filters. Oneor two filters can be inserted in addition to the 8-MHz filter, which is standard.The required filter is selected by pressing the SAW FILTER BW soft key severaltimes. Unused slots are automatically identified. They are displayed in italics andcannot be selected. When the internal noise generator is active (refer to MEA-SURE Menu on page 2–46), the noise power is automatically increased so that aconstant noise level is obtained in the selected filter bandwidth.SYMBOL RATE. The SYMBOL RATE... soft key is used for configuring thesymbol rate of the QAM demodulator. The rate is calculated from the net datarate D according to the formulaSymbol Rate D 204188 1log 2 (M) ,with M being the order of QAM (M = 4, 16, 32, 64, 128, 256). The factor of204/188 is the result of the Reed-Solomon error protection. This can be seen inthe following diagram.DDS200 Digital Demodulation System User Manual 2–31
Manual Operation84QAM16QAM32QAM64QAM128QAM7256QAM65Symbol rateSR in MSPS432100 10 20 30 40 50Net data rate D in Mbit/s Reed-Solomon 204/188To ensure proper function of the instrument, the symbol rate has to be accuratelyset. Refer to Figure 2–28.Figure 2–28: STATUS: SYMBOL RATE menuPress the SYMBOL RATE VALUE soft key and enter a value between 1.5 and7.0 MSPS (mega symbols per second) The value should be accurate to withinthree decimal digits.2–32 DDS200 Digital Demodulation System User Manual
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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
Page 19: PrefacexivDDS200 Digital Demodulati
Page 22 and 23: Preparation for UseFront PanelFront
Page 24 and 25: Preparation for UseTable 1-1: Legen
Page 26 and 27: Preparation for UseTable 1-2: Legen
Page 28 and 29: Preparation for UseUnpacking the Un
Page 30 and 31: Preparation for UsePositioning the
Page 32 and 33: Preparation for UsePowering OnConne
Page 34 and 35: Preparation for UseInitial update -
Page 36 and 37: Preparation for UseInstalling Optio
Page 38: Preparation for Use1-18 DDS200 Digi
Page 41 and 42: Manual OperationSample SettingThis
Page 43 and 44: Manual OperationFigure 2-3: MODE me
Page 45 and 46: Manual OperationPress the RECEIVER
Page 47 and 48: Manual OperationBasic OperationThe
Page 49 and 50: Manual OperationFigure 2-7: MEASURE
Page 51 and 52: Manual OperationSoft KeysThe soft k
Page 53 and 54: Manual OperationNumeric KeypadSelec
Page 55 and 56: Manual OperationPresetting the Unit
Page 57 and 58: Manual OperationFigure 2-14: RECALL
Page 59 and 60: 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: Manual OperationFigure 2-26: STO: E
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 and 112: Manual OperationFrom the standard d
Page 113 and 114: Manual OperationTable 2-5: Theoreti
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
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Manual Operationare taken into acco
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Manual OperationIt should be noted
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Manual OperationThe key characteris
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Manual OperationThe key characteris
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Remote Control
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Remote ControlIEC/IEEE-Bus Messages
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Remote ControlCommon commands. Comm
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Remote ControlNumeric suffix:If an
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Remote ControlExample: Special n
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Remote ControlParameter:In the para
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Remote Control*CLS*ESE 0 to 255*ESR
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Remote ControlInstrument Model and
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Remote ControlOutput UnitThe output
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Remote ControlCONDition register. T
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Remote ControlOverview of StatusReg
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Remote ControlTable 3-2: Definition
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Remote ControlTable 3-5: Definition
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Remote ControlResetting the StatusR
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Maintenance and TroubleshootingRepl
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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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