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Fluke 2620A, 2625A Additional Considerations, Chapter, Title, Computer Interface Trigger Control

Models: 2625A 2620A

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Page 117

Chapter 5

Additional Considerations

Title	Page
Introduction	5-3
Measurement Rate	5-3
Advanced Trigger Mechanisms	5-3
Front Panel Trigger Control	5-3
Computer Interface Trigger Control	5-3
Both External and Monitor Alarms Disabled (Type 0)	5-4
External Trigger Enabled (Type 1)	5-4
Monitor Alarm Enabled (Type 2)	5-6
Thermal Voltages	5-6
When Measuring Resistance or Temperature (RTD)	5-6
True RMS Measurements	5-8
Effects of Internal Noise in AC Measurements	5-8
Waveform Comparison (True RMS vs Average Responding)	5-8
Making Mixed Measurements	5-9
Using Shielded Wiring	5-11
General Rule	5-11
Alternate Suggestions	5-11
Non-Isolated Sensor Configuration	5-11
Isolated and Shielded Sensor Configuration	5-11
In More Detail	5-12

5-1

Page 117

Image 117

Fluke 2620A Additional Considerations, Chapter, Title, Computer Interface Trigger Control, External Trigger Enabled Type

Contents

2620A/2625A Users ManualHydra Series II Data Acquisition Unit Hydra Series II Data Logger 5/94 LIMITED WARRANTY & LIMITATION OF LIABILITYTitle Table of ContentsIntroduction OverviewUsing the Computer Interface 2620A/2625AOperating the Instrument from the Front Panel Computer Interface Command Set Using the IEEE-488 InterfaceUsing Shielded Wiring Additional Considerations2620A/2625A MaintenanceAppendices IndexTitle List of Tables2620A/2625A Performance Tests for RTD Temperature Function DIN/IEC 751 AmendmentPerformance Tests Voltage, Resistance, and Frequency Amendment 1 IPTS-68Title List of Figures4-Terminal Connections to Decade Resistance Box Hydra DB-9 to PC DB-9 RS-232 Connection GenericDeclaration of the Manufacturer or Importer Interference InformationBescheinigung des Herstellers/Importeurs viiiSymbols Marked on Equipment Safety Terms in this ManualTo avoid electric shock ∙ Remove inputs from live voltages before opening the input moduleDC Power Source AC Power SourceUse the Proper Power Cord 2620A/2625ASetting Up a Channel Getting StartedIntroduction The BasicsSelecting the Scan Data Destination 2620A/2625AGetting Started continued Taking Measurements2620A/2625A Press Mto activate the Monitor functionViewing Minimum, Maximum, and Last Data Values oo24f.eps LAST MIN MAX LAST MIN MAXUsers Manual 2620A/2625AChapter IntroductionTitle PageUsers Manual 2620A, 2625AThe Hydra Series II Data Acquisition Unit Options and AccessoriesThe Hydra Series II Data Logger IEEE-488 Interface Assembly2620A, 2625A Table 1-1. Hydra FeaturesAccessories Where to go From HereWhere to go From Here IntroductionChapter 6 Maintenance Chapter 4 Using the Computer InterfaceGetting Started Chapter 1 IntroductionOverview ChapterTitle Users Manual 2620A, 2625AIntroduction Setting Up the InstrumentAdjusting the Handle Unpacking and Inspecting the InstrumentFront/Rear Panel Features Line PowerSetting Up the Instrument OverviewFigure 2-2. Front Panel Figure 2-3. Left Display Figure 2-4. Right DisplayFigure 2-5. Annunciators Setting Up the Instrument OverviewTable 2-1. Display Annunciators 2620A, 2625A Table 2-1. Display Annunciators contFigure 2-6. Rear View Operating Modes Turning the Instrument OnInput Channels Reading the Display Front Panel DisplayLeft Display Right DisplayFront Panel Buttons Using the ButtonsSelecting a Channel N O L K Setting up a ChannelSetting up a Channel Alarm Limits Setting Alarm Limits and Mx+B Scaling ValuesMx+B Scaling Setting the Scan IntervalUsing the Monitor Function Using the Scan FunctionReviewing Channel Data Viewing the Totalizer Count Using External DC Power2620A, 2625A Using the Rack Mount KitUsing the Digital I/O Lines Operating the Instrument from the Front PanelChanging the Temperature Unit Setting Date and Time of DayFront Panel Review Only Function 2620A, 2625AFront Panel Monitor Only Function Computer Interface-Initiated LockoutsFigure 3-1. Configuration Mode Configuration ModeIntroduction Operating ModesChannel Configuration What is the Present Configuration?Other Displayed Data If Power is InterruptedTable 3-1. Configuration Reset Settings Channels 4-20 assigned to digital I/O lines 4-7, as followscleared for all channels Page Operating the Instrument from the Front Panel Channel Configuration2620A, 2625A Alarm Limits Setting AlarmsChannel Configuration Operating the Instrument from the Front PanelGAGE Alarm IndicationsUsing the Digital I/O Lines Resetting Alarm ConditionsTable 3-8. Initial Alarm Assignments, Digital I/O Lines 4 Through Mx+B ScalingB to define the scaling values Page Entering and Changing Numeric Values Instrument ConfigurationSelecting the Measurement Rate Selecting Scan IntervalTriggering Changing the Temperature UnitExternal Triggering Table 3-11. Measurement Rate SelectionSetting Date and Time of Day Measurement ConnectionsTo avoid electric shock ∙ Remove inputs from live voltages before opening the input moduleDC Volts, AC Volts, Frequency, and Thermocouples Measurement Connections Operating the Instrument from the Front PanelSTRAIN RELIEF Figure 3-2. Input Module ConnectionsResistance and RTD Operating the Instrument from the Front Panel Measurement ConnectionsUSE H AND L TERMINALS FOR ANY CHANNEL CHANNEL 0 ON FRONT PANEL Review Array TotalizingGeneral ConnectionsList Button Functions Note1 Table 3-16. List Button OperationMemory Storage AutoprintFront Panel Lock out Conditions Front Panel Review Only FunctionFront Panel Monitor Only Function REM Annunciator CalibrationComputer Interface-Initiated Lockouts Users Manual 2620A, 2625AInstalling the IEEE-488 Interface Using the Computer InterfaceChapter TitleComputer Interface Command Set Service Request Enable RegisterStatus Byte Register 4-19To determine which computer interface is enabled, select COMM K Using the RS-232 Computer InterfaceL. If IEEE appears on the display, the IEEE-488 interface is enabled Otherwise, if a baud rate appears, the RS-232 interface is enabledSetting Communication Parameters RS-232 Autoprint and Memory Storage RS-232 Autoprint Computer Interface ControlAutoprint Output Format Memory Retrieval Memory Storage Computer Interface Control07420102/09/91 5 -3.2345 mMX+B H/R12123.87 kOHMS/L1731.268VAC ALM15DIO204TOTAL0Memory Full Operation Clearing MemoryCabling the Instrument to a Host or Printer RS-232 Device Clear Using Ctrl C Installation TestRS-232 Information Character EchoingSample Program Using the RS-232 Computer Interface Using the IEEE-488 InterfaceInstalling the IEEE-488 Interface RS-232 PromptsFigure 4-2. Sample Program 2620A, 2625AUsing the Computer Interface Using the IEEE-488 InterfaceFigure 4-2. Sample Program cont Enabling the IEEE-488 Interface Table 4-3. IEEE-488 Setup BaudAddressCapability Table 4-2. IEEE-488.1 Capabilities DescriptionGeneral Information RS-232 and IEEE-488 Installation TestHow the Instrument Processes Input The instrument stores received input in a 350-byte input buffer Input StringsInput Terminators Typical Input StringsGeneral Information RS-232 and IEEE-488 Using the Computer InterfaceFUNC 1, OHMS, 3 FUNC 12, TEMP, KSending Numeric Values to the Instrument RS-232 and IEEE-488 Sending Input Strings to the InstrumentHow the Instrument Processes Output Service Requests IEEE-488 only and Status Registers 7 6 ESB Output Queue2620A, 2625A Status Byte Register Event Status and Event Status Enable RegistersName Table 4-4. Status Byte Register DescriptionReading the Status Byte Register Instrument Event Register Service Request Enable RegisterComputer Interface Command Set Using the Computer Interface Computer Interface Command SetTable 4-7. Command and Query Summary 2620A, 2625A Table 4-7. Command and Query Summary contUsing the Computer Interface Computer Interface Command SetTable 4-7. Command and Query Summary cont 2620A, 2625A Table 4-8. Command and Query ReferenceUsing the Computer Interface Computer Interface Command SetTable 4-8. Command and Query Reference cont 2620A, 2625A Computer Interface Command Set Using the Computer Interfacelimitnum = DOstateReturn alarm limit data for specified channel and limit 2620A, 2625ASet instrument calendar values Computer Interface Command Set Using the Computer Interface2620A, 2625A Table 4-8. Command and Query Reference contUsing the Computer Interface Computer Interface Command SetIf the channel indicated is invalid, an Execution Error is generated. For valid channels, two or three comma-separated data fields are returned. One of the following function definitions is returned in the first data field 2620A, 2625A Table 4-8. Command and Query Reference contUsing the Computer Interface Computer Interface Command SetLOCK LOCK? LOCS LOG? LOGGED? LOGBIN? LOGCLR LOGCOUNT? 2620A, 2625AUsing the Computer Interface Computer Interface Command SetTable 4-8. Command and Query Reference cont Table 4-8. Command and Query Reference cont Enables monitoring of given channel if monitoring2620A, 2625A Using the Computer Interface Computer Interface Command SetNext Scan’s Values 2620A, 2625A Computer Interface Command Set Using the Computer Interface2620A, 2625A Table 4-8. Command and Query Reference contComputer Interface Command Set Using the Computer Interface2620A, 2625A Table 4-8. Command and Query Reference contUsing the Computer Interface Computer Interface Command SetTOTAL TOTAL? TOTALDBNC TOTALDBNC? TRIGGER 2620A, 2625A alarmTRIGGER? Trigger Type QueryExternal Trigger Enabled Type Additional ConsiderationsMonitor Alarm Enabled Type When Measuring Resistance or Temperature RTDUsers Manual 2620A, 2625AAdvanced Trigger Mechanisms Measurement RateIntroduction These two additional trigger mechanisms are mutually exclusiveBoth External and Monitor Alarms Disabled Type External Trigger Enabled TypeREMS, a *TRG can be generated from the front panel by pressing Q Advanced Trigger Mechanisms Additional ConsiderationsWhen Measuring Resistance or Temperature RTD Thermal VoltagesMonitor Alarm Enabled Type When Measuring Resistance or Temperature Rtd Additional Considerationsoo16f.eps True RMS Measurements Effects of Internal Noise in AC MeasurementsWaveform Comparison True RMS vs Average Responding Making Mixed Measurements Making Mixed Measurements2620A, 2625A Figure 5-3. Comparison of Common WaveformsTO DISPLAY RMS FOR SINE WAVES Non-Isolated Sensor Configuration Using Shielded WiringIsolated and Shielded Sensor Configuration WWarningIn More Detail Thermocouple Temperature Accuracy Test MaintenanceDedicated Alarm Output Test ChapterUsers Manual 2620A, 2625ASelf-Test Diagnostics and Error Codes CleaningLine Fuse When the instrument is powered up, the entire display lightsPerformance Tests Error MaintenanceTable 6-1. Power-Up Error Codes Description Performance Tests2620A, 2625A Table 6-2. Recommended Test Equipment Minimum SpecificationInstrument Type Recommended ModelChannel Integrity Test Accuracy Verification Test20 mV 2620A, 2625ATable 6-3. Performance Tests Voltage, Resistance, and Frequency cont Thermocouple Measurement Range Accuracy Test4-Terminal Resistance Test Thermocouple Temperature Accuracy Test EX SNS 2620A, 2625AEX GRD OUTPUTDECADE RESISTANCE BOX Open Thermocouple Response TestHYDRA INPUT MODULE J K N E TRTD Temperature Accuracy Test Using Decade Resistance Source RTD Temperature Accuracy TestDigital Input/Output Verification Tests RTD Temperature Accuracy Test Using DIN/IECDigital Output Test DOLEVEL 0,0 CR Assure output 0 measures a LOW state. DOLEVEL 1,0 CRDigital Input Test TERMINAL GROUNDED Totalizer TestTable 6-7. Digital Input Values STATE OF DIGITAL INPUTS DECIMAL VALUETotalizer Sensitivity Test Dedicated Alarm Output Test V ΩA 2620A, 2625ACalibration External Trigger Input TestCalibration Variations in the Display ServiceAppendices AppendixTitle Page Appendix A SpecificationsAccuracies at Ambient Temperatures Other Than Specified IntroductionNormal Mode Rejection DC Voltage InputsCommon Mode Rejection 2620A/2625AAppendices Thermocouple Inputs2620A/2625A Common Mode and Normal Mode Rejection RTD InputsAppendices Input Impedance2-Wire Accuracy AC Voltage InputsMaximum Sensor Temperature 2620A/2625AAppendices Common Mode Rejection Crest Factor ErrorDC Component Error 2620A/2625A2-Wire Accuracy Ohms InputsAppendices Input Protection2620A/2625A Frequency InputsFrequency Range SensitivityTypical Scanning Rate AppendicesA-11 Totalizing Input Maximum Autoranging TimeDigital Inputs 2620A/2625AAppendices Trigger InputIsolation ThresholdReal-Time Clock and Calendar Digital and Alarm OutputsEnvironmental Battery LifeCommon Mode Voltage GeneralWeight Appendices2620A Options 2625A Data StoragePower 2620A/2625AAppendix B ASCII & IEEE-488 Bus CodesASCII & BUS CODES Appendix C IEEE-488.2 Devise Documentation RequirementsImplementation of IEEE Standard The initial power-up device setting is Channels 0 - 20OFFAlarm assignments Channels 0-3 assigned to outputs 0-3,respectively Alarm parameters Limit-1 and Limit-2 OFF. All limit valuesDigital I/O lines high non-alarm Totalizer 0, with debounce disabled Open Thermocouple Detection OTC enabledThe following queries return data in two formats ALARMLIMIT? COMMAND MESSAGE UNIT QUERY MESSAGE UNIT COMMAND PROGRAM HEADERAppendices PROGRAM MESSAGE UNIT PROGRAM MESSAGE UNIT SEPARATORThe *RDT and *RDT? commands are not implemented The *CAL? command not implemented an optional command2620A/2625A There are no device-to-device messagesAppendices Operation complete is generated when the command is parsed2620A/2625A Making Mixed Measurements Signal Cross Talk in a DC Voltage ChannelAppendix D IntroductionAC Signal Cross Talk Into an Ohms Channel AC Signal Cross Talk Into an AC Voltage ChannelAC Signal Cross Talk Into a Frequency Channel Ratio worst caseTEMPERATURE Error Ratio = ⎢ AC Signal Crosstalk Into a Temperature Channel5.0 × 2.0 ×2620A/2625A Appendix E Binary Upload of Logged Data LOGBIN? 2625A onlyDecoding the ASCII String IntroductionFigure E-1. ASCII String Decoding 2620A/2625AAppendices Floating Point Conversion2620A/2625A ExampleFigure E-2. Floating Point Conversion AppendicesFigure E-3. Example 2620A/2625AAppendix F RS-232 CablingConnections CablesRS43 2620A/2625APRINTER PRINTERAppendices RTS - REQUEST TO SEND CTS - CLEAR TO SEND RI - RING INDICATORRS43 CABLE NULL MODEM DCD Rx Tx DTR GND DSR RTS CTS RIRx Tx DTR GND DSR RTS CTS 2620A/2625ARS40 CABLE OR EQUAL Tx Rx RTS CTS DSR GND DCDFigure F-4. Hydra DB-9 to Modem DB-25 RS-232 Connection AppendicesRx Tx DTR GND DSR RTS CTS 2620A/2625ARS42 CABLE OR EQUAL Tx Rx RTS CTS DSR GND DCDAppendices Figure F-6. RS-232 DB9 and DB-25 Connectors2620A/2625A Hydra Configuration Record Index

Additional Considerations

Computer Interface Trigger Control

External Trigger Enabled (Type 1)

Monitor Alarm Enabled (Type 2)

When Measuring Resistance or Temperature (RTD)

Effects of Internal Noise in AC Measurements