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Fluke 2620A/2625A, Input Impedance, Maximum Crest Factor, Crest Factor Error, Maximum AC Input

Models: 2625A 2620A

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2620A/2625A

Users Manual

Frequency

20 Hz - 50 Hz

50 Hz - 100 Hz

100 Hz - 10 kHz

10 kHz - 20 kHz

20 kHz - 50 kHz

50 kHz - 100 kHz

Maximum Input at Upper Frequency

300 V rms

300 V rms

200 V rms

100 V rms

40 V rms

20 V rms

Input Impedance

1 MΩ in parallel with 100 pF maximum Maximum

Maximum Crest Factor

3.0

2.0 for rated accuracy

Crest Factor Error

Non-sinusoidal input signals with crest factors between 2 and 3 and pulse widths 100 µs and longer add 0.2% to the accuracy specifications.

Common Mode Rejection

80 dB minimum at 50 or 60 Hz ± 0.1%, 1 kΩ imbalance, slow rate

Maximum AC Input

300V rms or 424V peak on channels 0, 1, and 11

150V rms or 212V peak on channels 2 to 10 and 12 to 20 Voltage ratings between channels must not be exceeded

2 x 106 Volt-Hertz product on any range, normal mode input

1 x 10 6 Volt-Hertz product on any range, common mode input

DC Component Error

SCAN and first MONitor measurements will be incorrect if the dc signal component exceeds 60 counts in slow rate or 10 counts in fast rate. To measure ac with a dc component present, MONitor the input and wait 5 seconds before recording the measurement.

Cross-Talk Rejection

Refer to Appendix D.

A-8

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Fluke 2620A/2625A, Input Impedance, Maximum Crest Factor, Crest Factor Error, Common Mode Rejection, Maximum AC Input

Contents

Users Manual 2620A/2625AHydra Series II Data Acquisition Unit Hydra Series II Data Logger LIMITED WARRANTY & LIMITATION OF LIABILITY 5/94Table of Contents TitleIntroduction Overview2620A/2625A Using the Computer InterfaceOperating the Instrument from the Front Panel Using the IEEE-488 Interface Computer Interface Command SetUsing Shielded Wiring Additional ConsiderationsMaintenance 2620A/2625AAppendices IndexList of Tables TitlePerformance Tests for RTD Temperature Function DIN/IEC 751 Amendment 2620A/2625APerformance Tests Voltage, Resistance, and Frequency Amendment 1 IPTS-68List of Figures Title4-Terminal Connections to Decade Resistance Box Hydra DB-9 to PC DB-9 RS-232 Connection GenericInterference Information Declaration of the Manufacturer or ImporterBescheinigung des Herstellers/Importeurs viiiSafety Terms in this Manual Symbols Marked on EquipmentTo avoid electric shock ∙ Remove inputs from live voltages before opening the input moduleAC Power Source DC Power SourceUse the Proper Power Cord 2620A/2625AGetting Started Setting Up a ChannelIntroduction The Basics2620A/2625A Selecting the Scan Data DestinationTaking Measurements Getting Started continuedPress Mto activate the Monitor function 2620A/2625AViewing Minimum, Maximum, and Last Data Values LAST MIN MAX LAST MIN MAX oo24f.eps2620A/2625A Users ManualIntroduction ChapterTitle Page2620A, 2625A Users ManualOptions and Accessories The Hydra Series II Data Acquisition UnitThe Hydra Series II Data Logger IEEE-488 Interface AssemblyTable 1-1. Hydra Features 2620A, 2625AWhere to go From Here AccessoriesWhere to go From Here IntroductionChapter 4 Using the Computer Interface Chapter 6 MaintenanceGetting Started Chapter 1 IntroductionChapter OverviewTitle 2620A, 2625A Users ManualSetting Up the Instrument IntroductionAdjusting the Handle Unpacking and Inspecting the InstrumentLine Power Front/Rear Panel FeaturesOverview Setting Up the InstrumentFigure 2-2. Front Panel Figure 2-4. Right Display Figure 2-3. Left DisplayFigure 2-5. Annunciators Overview Setting Up the InstrumentTable 2-1. Display Annunciators Table 2-1. Display Annunciators cont 2620A, 2625AFigure 2-6. Rear View Turning the Instrument On Operating ModesInput Channels Front Panel Display Reading the DisplayLeft Display Right DisplayUsing the Buttons Front Panel ButtonsSelecting a Channel Setting up a Channel N O L KSetting up a Channel Setting Alarm Limits and Mx+B Scaling Values Alarm LimitsSetting the Scan Interval Mx+B ScalingUsing the Scan Function Using the Monitor FunctionReviewing Channel Data Using External DC Power Viewing the Totalizer CountUsing the Rack Mount Kit 2620A, 2625AOperating the Instrument from the Front Panel Using the Digital I/O LinesChanging the Temperature Unit Setting Date and Time of Day2620A, 2625A Front Panel Review Only FunctionFront Panel Monitor Only Function Computer Interface-Initiated LockoutsConfiguration Mode Figure 3-1. Configuration ModeIntroduction Operating ModesWhat is the Present Configuration? Channel ConfigurationOther Displayed Data If Power is InterruptedChannels 4-20 assigned to digital I/O lines 4-7, as follows Table 3-1. Configuration Reset Settingscleared for all channels Page Channel Configuration Operating the Instrument from the Front Panel2620A, 2625A Setting Alarms Alarm LimitsChannel Configuration Operating the Instrument from the Front PanelAlarm Indications GAGEResetting Alarm Conditions Using the Digital I/O LinesMx+B Scaling Table 3-8. Initial Alarm Assignments, Digital I/O Lines 4 ThroughB to define the scaling values Page Instrument Configuration Entering and Changing Numeric ValuesSelecting Scan Interval Selecting the Measurement RateChanging the Temperature Unit TriggeringExternal Triggering Table 3-11. Measurement Rate SelectionMeasurement Connections Setting Date and Time of DayTo avoid electric shock ∙ Remove inputs from live voltages before opening the input moduleDC Volts, AC Volts, Frequency, and Thermocouples Operating the Instrument from the Front Panel Measurement ConnectionsSTRAIN RELIEF Figure 3-2. Input Module ConnectionsResistance and RTD Measurement Connections Operating the Instrument from the Front PanelUSE H AND L TERMINALS FOR ANY CHANNEL CHANNEL 0 ON FRONT PANEL Totalizing Review ArrayGeneral ConnectionsList Button Functions Table 3-16. List Button Operation Note1Autoprint Memory StorageFront Panel Review Only Function Front Panel Lock out ConditionsFront Panel Monitor Only Function Calibration REM AnnunciatorComputer Interface-Initiated Lockouts 2620A, 2625A Users ManualUsing the Computer Interface Installing the IEEE-488 InterfaceChapter TitleService Request Enable Register Computer Interface Command SetStatus Byte Register 4-19Using the RS-232 Computer Interface To determine which computer interface is enabled, select COMM KL. 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 Computer Interface Control Autoprint and Memory Storage RS-232Autoprint Output Format Memory Storage Computer Interface Control Memory Retrieval07420102/09/91 5 -3.2345 mMX+B H/R12123.87 kOHMS/L1731.268VAC ALM15DIO204TOTAL0Clearing Memory Memory Full OperationCabling the Instrument to a Host or Printer RS-232 Installation Test Device Clear Using Ctrl CRS-232 Information Character EchoingUsing the IEEE-488 Interface Sample Program Using the RS-232 Computer InterfaceInstalling the IEEE-488 Interface RS-232 Prompts2620A, 2625A Figure 4-2. Sample ProgramUsing the IEEE-488 Interface Using the Computer InterfaceFigure 4-2. Sample Program cont Table 4-3. IEEE-488 Setup BaudAddress Enabling the IEEE-488 InterfaceCapability Table 4-2. IEEE-488.1 Capabilities DescriptionInstallation Test General Information RS-232 and IEEE-488How the Instrument Processes Input Input Strings The instrument stores received input in a 350-byte input bufferInput Terminators Typical Input StringsUsing the Computer Interface General Information RS-232 and IEEE-488FUNC 1, OHMS, 3 FUNC 12, TEMP, KSending Input Strings to the Instrument Sending Numeric Values to the Instrument RS-232 and IEEE-488How the Instrument Processes Output Service Requests IEEE-488 only and Status Registers Output Queue 7 6 ESB2620A, 2625A Event Status and Event Status Enable Registers Status Byte RegisterName Table 4-4. Status Byte Register DescriptionReading the Status Byte Register Service Request Enable Register Instrument Event RegisterComputer Interface Command Set Computer Interface Command Set Using the Computer InterfaceTable 4-7. Command and Query Summary Table 4-7. Command and Query Summary cont 2620A, 2625AComputer Interface Command Set Using the Computer InterfaceTable 4-7. Command and Query Summary cont Table 4-8. Command and Query Reference 2620A, 2625AComputer Interface Command Set Using the Computer InterfaceTable 4-8. Command and Query Reference cont 2620A, 2625A Using the Computer Interface Computer Interface Command Setlimitnum = DOstate2620A, 2625A Return alarm limit data for specified channel and limitSet instrument calendar values Using the Computer Interface Computer Interface Command SetTable 4-8. Command and Query Reference cont 2620A, 2625AComputer Interface Command Set Using the Computer InterfaceIf 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 Table 4-8. Command and Query Reference cont 2620A, 2625AComputer Interface Command Set Using the Computer InterfaceLOCK LOCK? LOCS LOG? 2620A, 2625A LOGGED? LOGBIN? LOGCLR LOGCOUNT?Computer Interface Command Set Using the Computer InterfaceTable 4-8. Command and Query Reference cont Enables monitoring of given channel if monitoring Table 4-8. Command and Query Reference cont2620A, 2625A Computer Interface Command Set Using the Computer InterfaceNext Scan’s Values 2620A, 2625A Using the Computer Interface Computer Interface Command SetTable 4-8. Command and Query Reference cont 2620A, 2625AUsing the Computer Interface Computer Interface Command SetTable 4-8. Command and Query Reference cont 2620A, 2625AComputer Interface Command Set Using the Computer InterfaceTOTAL TOTAL? TOTALDBNC TOTALDBNC? TRIGGER alarm 2620A, 2625ATRIGGER? Trigger Type QueryAdditional Considerations External Trigger Enabled TypeMonitor Alarm Enabled Type When Measuring Resistance or Temperature RTD2620A, 2625A Users ManualMeasurement Rate Advanced Trigger MechanismsIntroduction These two additional trigger mechanisms are mutually exclusiveExternal Trigger Enabled Type Both External and Monitor Alarms Disabled TypeREMS, a *TRG can be generated from the front panel by pressing Q Additional Considerations Advanced Trigger MechanismsThermal Voltages When Measuring Resistance or Temperature RTDMonitor Alarm Enabled Type Additional Considerations When Measuring Resistance or Temperature Rtdoo16f.eps Effects of Internal Noise in AC Measurements True RMS MeasurementsWaveform Comparison True RMS vs Average Responding Making Mixed Measurements Making Mixed MeasurementsFigure 5-3. Comparison of Common Waveforms 2620A, 2625ATO DISPLAY RMS FOR SINE WAVES Using Shielded Wiring Non-Isolated Sensor ConfigurationIsolated and Shielded Sensor Configuration WWarningIn More Detail Maintenance Thermocouple Temperature Accuracy TestDedicated Alarm Output Test Chapter2620A, 2625A Users ManualCleaning Self-Test Diagnostics and Error CodesLine Fuse When the instrument is powered up, the entire display lightsPerformance Tests Maintenance ErrorTable 6-1. Power-Up Error Codes Description Performance TestsTable 6-2. Recommended Test Equipment Minimum Specification 2620A, 2625AInstrument Type Recommended ModelAccuracy Verification Test Channel Integrity Test2620A, 2625A 20 mVThermocouple Measurement Range Accuracy Test Table 6-3. Performance Tests Voltage, Resistance, and Frequency cont4-Terminal Resistance Test Thermocouple Temperature Accuracy Test 2620A, 2625A EX SNSEX GRD OUTPUTOpen Thermocouple Response Test DECADE RESISTANCE BOXHYDRA INPUT MODULE J K N E TRTD Temperature Accuracy Test RTD Temperature Accuracy Test Using Decade Resistance SourceRTD Temperature Accuracy Test Using DIN/IEC Digital Input/Output Verification TestsDOLEVEL 0,0 CR Assure output 0 measures a LOW state. DOLEVEL 1,0 CR Digital Output TestDigital Input Test Totalizer Test TERMINAL GROUNDEDTable 6-7. Digital Input Values STATE OF DIGITAL INPUTS DECIMAL VALUETotalizer Sensitivity Test Dedicated Alarm Output Test 2620A, 2625A V ΩAExternal Trigger Input Test CalibrationCalibration Service Variations in the DisplayAppendix AppendicesTitle Page Specifications Appendix AAccuracies at Ambient Temperatures Other Than Specified IntroductionDC Voltage Inputs Normal Mode RejectionCommon Mode Rejection 2620A/2625AThermocouple Inputs Appendices2620A/2625A RTD Inputs Common Mode and Normal Mode RejectionAppendices Input ImpedanceAC Voltage Inputs 2-Wire AccuracyMaximum Sensor Temperature 2620A/2625AAppendices Crest Factor Error Common Mode RejectionDC Component Error 2620A/2625AOhms Inputs 2-Wire AccuracyAppendices Input ProtectionFrequency Inputs 2620A/2625AFrequency Range SensitivityAppendices Typical Scanning RateA-11 Maximum Autoranging Time Totalizing InputDigital Inputs 2620A/2625ATrigger Input AppendicesIsolation ThresholdDigital and Alarm Outputs Real-Time Clock and CalendarEnvironmental Battery LifeGeneral Common Mode VoltageWeight Appendices2625A Data Storage 2620A OptionsPower 2620A/2625AASCII & IEEE-488 Bus Codes Appendix BASCII & BUS CODES IEEE-488.2 Devise Documentation Requirements Appendix CImplementation of IEEE Standard The initial power-up device setting is Channels 0 - 20OFFAlarm parameters Limit-1 and Limit-2 OFF. All limit values Alarm assignments Channels 0-3 assigned to outputs 0-3,respectivelyDigital I/O lines high non-alarm Totalizer 0, with debounce disabled Open Thermocouple Detection OTC enabledCOMMAND MESSAGE UNIT QUERY MESSAGE UNIT COMMAND PROGRAM HEADER The following queries return data in two formats ALARMLIMIT?Appendices PROGRAM MESSAGE UNIT PROGRAM MESSAGE UNIT SEPARATORThe *CAL? command not implemented an optional command The *RDT and *RDT? commands are not implemented2620A/2625A There are no device-to-device messagesOperation complete is generated when the command is parsed Appendices2620A/2625A Signal Cross Talk in a DC Voltage Channel Making Mixed MeasurementsAppendix D IntroductionAC Signal Cross Talk Into an AC Voltage Channel AC Signal Cross Talk Into an Ohms ChannelAC Signal Cross Talk Into a Frequency Channel Ratio worst caseAC Signal Crosstalk Into a Temperature Channel TEMPERATURE Error Ratio = ⎢5.0 × 2.0 ×2620A/2625A Binary Upload of Logged Data LOGBIN? 2625A only Appendix EDecoding the ASCII String Introduction2620A/2625A Figure E-1. ASCII String DecodingFloating Point Conversion AppendicesExample 2620A/2625AAppendices Figure E-2. Floating Point Conversion2620A/2625A Figure E-3. ExampleRS-232 Cabling Appendix FConnections Cables2620A/2625A RS43PRINTER PRINTERRTS - REQUEST TO SEND CTS - CLEAR TO SEND RI - RING INDICATOR AppendicesRS43 CABLE NULL MODEM DCD Rx Tx DTR GND DSR RTS CTS RI2620A/2625A Rx Tx DTR GND DSR RTS CTSRS40 CABLE OR EQUAL Tx Rx RTS CTS DSR GND DCDAppendices Figure F-4. Hydra DB-9 to Modem DB-25 RS-232 Connection2620A/2625A Rx Tx DTR GND DSR RTS CTSRS42 CABLE OR EQUAL Tx Rx RTS CTS DSR GND DCDFigure F-6. RS-232 DB9 and DB-25 Connectors Appendices2620A/2625A Hydra Configuration Record Index