User Manual DDS200 Digital Demodulation System 070-9952-00

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Manual OperationBER of 1E-11 is obtained after the decoder, which corresponds to a practicallyerror-free transmission. For demonstration purposes, the error protection can beswitched off. In this case, the uncorrected data are available at the MPEG output.ERROR BIT IN MPEG FRAME: With this key, a selection can be made whetherthis software indication for a whole MPEG frame should be set or not in theevent of uncorrectable data errors. In practice, this function is not very important,since a connected decoder must evaluate the received data.PARALLEL MPEG DATA PLL: Here the integrated phase-lock loop (PLL)eliminating the jitter in the data and clock lines can be switched on and off. Withcertain symbol rates, switching the PLL off may be advantageous.NOTE. The PLL configuration also affects the serial output for external BERmeasurements (X6 and X5). If the serial MPEG data interface (X7) is mainlyused, the PLL should be switched off. If it is on, incorrect BER measurements orloss of synchronization may occur at low temperatures or immediately after theinstrument has been powered up.SER / PAR MPEG DATA FRAME SIZE: With the aid of this key a selection canbe made whether the serial and parallel MPEG outputs should use the wholeinformation (including the 16 error-protection bytes per frame) for datatransmission or whether only the 188 relevant data bytes should be transmitted.This makes no difference for the error protection function. However, some of theMPEG decoders accept only one data format. The MTD200 MPEG Test Decodercan handle both formats, and switch over is automatic. The 188-byte mode ispreferred for the MTD200 MPEG Test Decoder. For more detailed information,refer to Assignment and Functions of Parallel and Serial MPEG-2 Outputs onpage 2–85.I/Q INVERSION: The DDS200 continuously monitors the transmitted datastream for MPEG-2 sync words. If a synchronization is not possible, theinstrument inverts the I and Q data streams and restarts the procedure (providedAUTO has been selected). With NORMAL and INVERTED, this automaticswitch over can be disabled and the signal decoded in the normal or the invertedmode.NOTE. Switching off the automatic function is particularly important when theinstrument is to receive signals that are not coded to MPEG-2 standard.DDS200 Digital Demodulation System User Manual 2–37
Manual OperationALARM MenuThis subsection comprises the following topics:Configuring the Alarm Register page 2–38Alarm Register page 2–39Setting Limit Values page 2–41Statistics page 2–41Printing the Register page 2–43Clearing the Register page 2–45When lighted, the LED next to the ALARM key signals that at least one newalarm message has been registered since the register was called up last. The LEDturns off when the alarm register is called up with the ALARM key.Configuring the Alarm Register. Any of the alarm messages can be disabled sothat it is not entered into the alarm register. To do so, press the ALARM key inthe MAIN FUNCTION block and then the ALARM CONFIG soft key. Themenu shown in Figure 2–31 is displayed.Figure 2–31: ALARM: CONFIG menuBy pressing the respective key, each one of the alarm modes can be individuallyconfigured. If an alarm should not be signalled, select DISABLED. Anotherkeystroke switches back to ENABLED. Any change of the configuration isstored in the alarm register. If an alarm is disabled, the DDS200 enters “* * ” inthe respective column. An enabled alarm is indicated by “ – – ”.2–38 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
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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
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 and 70: Manual OperationFigure 2-26: STO: E
Page 71 and 72: Manual Operation84QAM16QAM32QAM64QA
Page 73 and 74: Manual OperationSPECIAL FUNCTION Me
Page 75: Manual OperationA wide loop bandwid
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
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
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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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