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Fluke 2620A, 2625A Ohms Inputs, Appendices, Wire Accuracy, Input Protection, Cross-Talk Rejection

Models: 2625A 2620A

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Appendices

Specifications A

Ohms Inputs

	Range	Resolution

		Slow	Fast

	300 Ω	10 mΩ	0.1 Ω
	3 kΩ	0.1 Ω	1 Ω

	30 kΩ	1 Ω	10 Ω

	300 kΩ	10 Ω	100 Ω

	3 MΩ	100 Ω	1 kΩ

	10 MΩ	1 kΩ	10 kΩ

Typical Full

Scale Voltage

0.22V 0.25V

0.29V

0.68V

2.25V

2.72V

Maximum

Current

Through

Unknown

1mA 110 μA 13 μA 3.2 .μA 3.2 μA 3.2 μA

Maximum Open

Circuit Voltage

3.2V

1.5V

1.5V

3.2V

3.2V

3.2V

Range

	4-Wire Accuracy ±(%±Ω)

	18°C to 28°C		0°C to 60°C

90 Days, Slow	1 Year, Slow	1 Year, Fast	1 Year, Slow	1 Year, Fast

300Ω

3 kΩ

30 kΩ

300 kΩ

3 MΩ

10 MΩ

0.013% + 20 mΩ

0.015% + 0.2 Ω

0.013% + 2 Ω

0.020% + 20 Ω

0.059% + 200 Ω

0.168% + 2 kΩ

0.014% + 20 mΩ

0.016% + 0.2 Ω

0.014% + 2 Ω

0.021% + 20 Ω

0.063% + 200 Ω

0.169% + 2 kΩ

0.014% + 0.2 Ω

0.016% + 2 Ω

0.014% + 20 Ω

0.021% + 200 Ω

0.063% + 2 kΩ

0.709% + 20 kΩ

0.031% + 20 mΩ

0.039% + 0.2 Ω

0.039% + 2 Ω

0.050% + 20 Ω

0.231% + 200 Ω

0.573% + 2 kΩ

0.031% + 0.2 Ω

0.039% + 2 Ω

0.039% + 20 Ω

0.050% + 200 Ω

0.231% + 2 kΩ

0.923% + 20 kΩ

2-Wire Accuracy

Add 4.0Ω to accuracy specifications for channels 1 to 20, and add 20 mΩ for channel 0. Lead wire resistances are not included.

Input Protection

300V dc or ac rms on all ranges

Cross-Talk Rejection

Refer to Appendix D.

A-9

Image 161

Fluke 2620A, 2625A user manual Ohms Inputs, Appendices, Wire Accuracy, Input Protection, Cross-Talk Rejection

Contents

Hydra Series II Data Acquisition Unit Hydra Series II Data Logger 2620A/2625AUsers Manual 5/94 LIMITED WARRANTY & LIMITATION OF LIABILITYTitle Table of ContentsIntroduction OverviewOperating the Instrument from the Front Panel Using the Computer Interface2620A/2625A 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 MeasurementsViewing Minimum, Maximum, and Last Data Values 2620A/2625APress Mto activate the Monitor function 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 IntroductionTitle OverviewChapter Users Manual 2620A, 2625AIntroduction Setting Up the InstrumentAdjusting the Handle Unpacking and Inspecting the InstrumentFront/Rear Panel Features Line PowerFigure 2-2. Front Panel Setting Up the InstrumentOverview Figure 2-5. Annunciators Figure 2-3. Left DisplayFigure 2-4. Right Display Table 2-1. Display Annunciators Setting Up the InstrumentOverview Figure 2-6. Rear View 2620A, 2625ATable 2-1. Display Annunciators cont Input Channels Operating ModesTurning the Instrument On Reading the Display Front Panel DisplayLeft Display Right DisplaySelecting a Channel Front Panel ButtonsUsing the Buttons 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 IntervalReviewing Channel Data Using the Monitor FunctionUsing the Scan Function 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 Interruptedcleared for all channels Table 3-1. Configuration Reset SettingsChannels 4-20 assigned to digital I/O lines 4-7, as follows 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 ConditionsB to define the scaling values Table 3-8. Initial Alarm Assignments, Digital I/O Lines 4 ThroughMx+B Scaling 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 USE H AND L TERMINALS FOR ANY CHANNEL CHANNEL 0 ON FRONT PANEL Operating the Instrument from the Front PanelMeasurement Connections Review Array TotalizingGeneral ConnectionsList Button Functions Note1 Table 3-16. List Button OperationMemory Storage AutoprintFront Panel Monitor Only Function Front Panel Lock out ConditionsFront Panel Review Only Function Computer Interface-Initiated Lockouts REM AnnunciatorCalibration 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 Output Format Autoprint and Memory Storage RS-232Autoprint Computer Interface Control Memory Retrieval Memory Storage Computer Interface Control07420102/09/91 5 -3.2345 mMX+B H/R12123.87 kOHMS/L1731.268VAC ALM15DIO204TOTAL0Cabling the Instrument to a Host or Printer RS-232 Memory Full OperationClearing Memory 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, 2625AFigure 4-2. Sample Program cont Using the Computer InterfaceUsing the IEEE-488 Interface Enabling the IEEE-488 Interface Table 4-3. IEEE-488 Setup BaudAddressCapability Table 4-2. IEEE-488.1 Capabilities DescriptionHow the Instrument Processes Input General Information RS-232 and IEEE-488Installation Test 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, KHow the Instrument Processes Output Sending Numeric Values to the Instrument RS-232 and IEEE-488Sending Input Strings to the Instrument Service Requests IEEE-488 only and Status Registers 2620A, 2625A 7 6 ESBOutput Queue 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 Table 4-7. Command and Query Summary Using the Computer InterfaceComputer Interface Command Set 2620A, 2625A Table 4-7. Command and Query Summary contTable 4-7. Command and Query Summary cont Using the Computer InterfaceComputer Interface Command Set 2620A, 2625A Table 4-8. Command and Query ReferenceTable 4-8. Command and Query Reference cont Using the Computer InterfaceComputer Interface Command Set 2620A, 2625A Computer Interface Command Set Using the Computer Interfacelimitnum = DOstateSet instrument calendar values Return alarm limit data for specified channel and limit2620A, 2625A Computer Interface Command Set Using the Computer Interface2620A, 2625A Table 4-8. Command and Query Reference contIf 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 Using the Computer InterfaceComputer Interface Command Set 2620A, 2625A Table 4-8. Command and Query Reference contLOCK LOCK? LOCS LOG? Using the Computer InterfaceComputer Interface Command Set LOGGED? LOGBIN? LOGCLR LOGCOUNT? 2620A, 2625ATable 4-8. Command and Query Reference cont Using the Computer InterfaceComputer Interface Command Set 2620A, 2625A Table 4-8. Command and Query Reference contEnables monitoring of given channel if monitoring Next Scan’s Values Using the Computer InterfaceComputer Interface Command Set 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 contTOTAL TOTAL? TOTALDBNC TOTALDBNC? TRIGGER Using the Computer InterfaceComputer Interface Command Set 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 exclusiveREMS, a *TRG can be generated from the front panel by pressing Q Both External and Monitor Alarms Disabled TypeExternal Trigger Enabled Type Advanced Trigger Mechanisms Additional ConsiderationsMonitor Alarm Enabled Type When Measuring Resistance or Temperature RTDThermal Voltages oo16f.eps When Measuring Resistance or Temperature RtdAdditional Considerations Waveform Comparison True RMS vs Average Responding True RMS MeasurementsEffects of Internal Noise in AC Measurements Making Mixed Measurements Making Mixed MeasurementsTO DISPLAY RMS FOR SINE WAVES 2620A, 2625AFigure 5-3. Comparison of Common Waveforms 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 Input Test Digital Output TestDOLEVEL 0,0 CR Assure output 0 measures a LOW state. DOLEVEL 1,0 CR 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 CalibrationExternal Trigger Input Test Variations in the Display ServiceTitle AppendicesAppendix 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 SensitivityA-11 Typical Scanning RateAppendices 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