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Fluke 2620A, 2625A, 3. Comparison of Common Waveforms, To Display Rms For Sine Waves

Models: 2625A 2620A

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2620A, 2625A

Users Manual

		PEAK VOLTAGES		MEASURED VOLTAGES			DC AND AC
AC-COUPLED				AC COMPONENT ONLY		DC	TOTAL RMS
INPUT						DC	TRUE RMS =
INPUT		PK-PK	0-PK			COMPONENT
WAVEFORM		PK-PK	0-PK	RMS CAL*	HYDRA	COMPONENT
WAVEFORM						ONLY	ac	2	+ dc	2
						ONLY		2		2

SINE		2.828
		2.828	1.414
PK			1.414
PK				1.000
	PK-PK			1.000
0	PK-PK				1.000
						0.000
							1.000
RECTIFIED SINE		1.414
(FULL WAVE)		1.414
(FULL WAVE)			1.414
			1.414
PK				0.421	0.436
PK	PK-PK				0.436	0.900
0	PK-PK					0.900
0							1.000
							1.000
RECTIFIED SINE		2.000
(HALF WAVE)			2.000
			2.000
				0.779
PK	PK-PK				0.771	0.636
0	PK-PK					0.636
0							1.000
							1.000
SQUARE		2.000
		2.000
PK			1.000	1.111
PK
					1.000
0	PK-PK				1.000
0	PK-PK					0.000
						0.000
							1.000
RECTIFIED		1.414
SQUARE		1.414	1.414
SQUARE
				0.785
PK-PK				0.785	0.707
PK-PK
PK
PK						0.707
						0.707	1.000
0							1.000
RECTANGULAR		2.000
PULSE		2.000
PULSE			2.000
PK			2.000
PK				4.442 K2
0 X	PK-PK			4.442 K2	2K
0 X					2K
Y						2D
D = X/Y						2D
D = X/Y								2	D
K = D-D2
TRIANGLE		3.464
SAWTOOTH			1.732
PK			1.732	0.962
PK
					1.000
0	PK-PK				1.000	0.000
0	PK-PK
							1.000
							1.000
* RMS CAL IS THE DISPLAYED VALUE FOR AVERAGE RESPONDING INSTRUMENTS THAT ARE CALIBRATED

TO DISPLAY RMS FOR SINE WAVES

oo17f.eps

Figure 5-3. Comparison of Common Waveforms

5-10

Page 126

Image 126

Fluke user manual 2620A, 2625A, 3. Comparison of Common Waveforms, To Display Rms For Sine Waves

Contents

2620A/2625A Users ManualHydra Series II Data Acquisition Unit Hydra Series II Data Logger LIMITED WARRANTY & LIMITATION OF LIABILITY 5/94Introduction Table of ContentsTitle OverviewUsing the Computer Interface 2620A/2625AOperating the Instrument from the Front Panel Using Shielded Wiring Using the IEEE-488 InterfaceComputer Interface Command Set Additional ConsiderationsAppendices Maintenance2620A/2625A IndexList of Tables TitlePerformance Tests for RTD Temperature Function DIN/IEC 751 Amendment 2620A/2625APerformance Tests Voltage, Resistance, and Frequency Amendment 1 IPTS-684-Terminal Connections to Decade Resistance Box List of FiguresTitle Hydra DB-9 to PC DB-9 RS-232 Connection GenericBescheinigung des Herstellers/Importeurs Interference InformationDeclaration of the Manufacturer or Importer viiiTo avoid electric shock Safety Terms in this ManualSymbols Marked on Equipment ∙ Remove inputs from live voltages before opening the input moduleUse the Proper Power Cord AC Power SourceDC Power Source 2620A/2625AIntroduction Getting StartedSetting Up a Channel The Basics2620A/2625A Selecting the Scan Data DestinationTaking Measurements Getting Started continued2620A/2625A Press Mto activate the Monitor functionViewing Minimum, Maximum, and Last Data Values LAST MIN MAX LAST MIN MAX oo24f.eps2620A/2625A Users ManualTitle IntroductionChapter Page2620A, 2625A Users ManualThe Hydra Series II Data Logger Options and AccessoriesThe Hydra Series II Data Acquisition Unit IEEE-488 Interface AssemblyTable 1-1. Hydra Features 2620A, 2625AWhere to go From Here Where to go From HereAccessories IntroductionGetting Started Chapter 4 Using the Computer InterfaceChapter 6 Maintenance Chapter 1 IntroductionOverview ChapterTitle 2620A, 2625A Users ManualAdjusting the Handle Setting Up the InstrumentIntroduction Unpacking and Inspecting the InstrumentLine Power Front/Rear Panel FeaturesSetting 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 Left Display Front Panel DisplayReading the Display Right DisplayFront Panel Buttons Using the 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 Monitor Function Using the Scan FunctionReviewing Channel Data Using External DC Power Viewing the Totalizer CountUsing the Rack Mount Kit 2620A, 2625ASetting Date and Time of Day Operating the Instrument from the Front PanelUsing the Digital I/O Lines ChapterFront Panel Monitor Only Function 2620A, 2625AFront Panel Review Only Function Computer Interface-Initiated LockoutsIntroduction Configuration ModeFigure 3-1. Configuration Mode Operating ModesOther Displayed Data What is the Present Configuration?Channel Configuration 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 Channel Configuration Operating the Instrument from the Front Panel2620A, 2625A Channel Configuration Setting AlarmsAlarm Limits Operating the Instrument from the Front PanelAlarm Indications GAGEResetting Alarm Conditions Using the Digital I/O LinesTable 3-8. Initial Alarm Assignments, Digital I/O Lines 4 Through Mx+B ScalingB 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 SelectionTo avoid electric shock Measurement ConnectionsSetting Date and Time of Day ∙ Remove inputs from live voltages before opening the input moduleDC Volts, AC Volts, Frequency, and Thermocouples STRAIN RELIEF Operating the Instrument from the Front PanelMeasurement Connections 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 General TotalizingReview Array ConnectionsList Button Functions Table 3-16. List Button Operation Note1Autoprint Memory StorageFront Panel Lock out Conditions Front Panel Review Only FunctionFront Panel Monitor Only Function REM Annunciator CalibrationComputer Interface-Initiated Lockouts 2620A, 2625A Users ManualChapter Using the Computer InterfaceInstalling the IEEE-488 Interface TitleStatus Byte Register Service Request Enable RegisterComputer Interface Command Set 4-19L. If IEEE appears on the display, the IEEE-488 interface is enabled Using the RS-232 Computer InterfaceTo determine which computer interface is enabled, select COMM K 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 07420102/09/91 Memory Storage Computer Interface ControlMemory Retrieval 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 RS-232 Information Installation TestDevice Clear Using Ctrl C Character EchoingInstalling the IEEE-488 Interface Using the IEEE-488 InterfaceSample Program Using the RS-232 Computer Interface RS-232 Prompts2620A, 2625A Figure 4-2. Sample ProgramUsing the Computer Interface Using the IEEE-488 InterfaceFigure 4-2. Sample Program cont Capability Table 4-3. IEEE-488 Setup BaudAddressEnabling the IEEE-488 Interface Table 4-2. IEEE-488.1 Capabilities DescriptionGeneral Information RS-232 and IEEE-488 Installation TestHow the Instrument Processes Input Input Terminators Input StringsThe instrument stores received input in a 350-byte input buffer Typical Input StringsFUNC 1, OHMS, 3 Using the Computer InterfaceGeneral Information RS-232 and IEEE-488 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 Name Event Status and Event Status Enable RegistersStatus Byte Register Table 4-4. Status Byte Register DescriptionReading the Status Byte Register Service Request Enable Register Instrument Event RegisterComputer Interface Command Set Using the Computer Interface Computer Interface Command SetTable 4-7. Command and Query Summary Table 4-7. Command and Query Summary cont 2620A, 2625AUsing the Computer Interface Computer Interface Command SetTable 4-7. Command and Query Summary cont Table 4-8. Command and Query Reference 2620A, 2625AUsing the Computer Interface Computer Interface Command SetTable 4-8. Command and Query Reference cont 2620A, 2625A limitnum = Using the Computer InterfaceComputer Interface Command Set DOstateReturn alarm limit data for specified channel and limit 2620A, 2625ASet instrument calendar values Using the Computer Interface Computer Interface Command SetTable 4-8. Command and Query Reference cont 2620A, 2625AUsing 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 Table 4-8. Command and Query Reference cont 2620A, 2625AUsing the Computer Interface Computer Interface Command SetLOCK LOCK? LOCS LOG? 2620A, 2625A LOGGED? LOGBIN? LOGCLR LOGCOUNT?Using 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 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, 2625AUsing the Computer Interface Computer Interface Command SetTOTAL TOTAL? TOTALDBNC TOTALDBNC? TRIGGER TRIGGER? alarm2620A, 2625A Trigger Type QueryMonitor Alarm Enabled Type Additional ConsiderationsExternal Trigger Enabled Type When Measuring Resistance or Temperature RTD2620A, 2625A Users ManualIntroduction Measurement RateAdvanced Trigger Mechanisms 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 Additional Considerations Advanced Trigger MechanismsWhen 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 Isolated and Shielded Sensor Configuration Using Shielded WiringNon-Isolated Sensor Configuration WWarningIn More Detail Chapter MaintenanceDedicated Alarm Output Test Title2620A, 2625A Users ManualLine Fuse CleaningSelf-Test Diagnostics and Error Codes When the instrument is powered up, the entire display lightsPerformance Tests Table 6-1. Power-Up Error Codes Description MaintenanceError Performance TestsInstrument Type Table 6-2. Recommended Test Equipment Minimum Specification2620A, 2625A 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 EX GRD 2620A, 2625AEX SNS OUTPUTHYDRA INPUT MODULE Open Thermocouple Response TestDECADE RESISTANCE BOX J K N E TRTD Temperature Accuracy Test Using Decade Resistance Source RTD Temperature Accuracy TestRTD Temperature Accuracy Test Using DIN/IEC Digital Input/Output Verification TestsDigital Output Test DOLEVEL 0,0 CR Assure output 0 measures a LOW state. DOLEVEL 1,0 CRDigital Input Test Table 6-7. Digital Input Values STATE OF DIGITAL INPUTS Totalizer TestTERMINAL GROUNDED DECIMAL VALUETotalizer Sensitivity Test Dedicated Alarm Output Test 2620A, 2625A V ΩACalibration External Trigger Input TestCalibration Service Variations in the DisplayAppendices AppendixTitle Page Introduction SpecificationsAppendix A Accuracies at Ambient Temperatures Other Than SpecifiedInput Impedance DC Voltage Inputs2620A/2625A Normal Mode RejectionThermocouple Inputs Appendices2620A/2625A Input Impedance RTD InputsAppendices Common Mode and Normal Mode Rejection2620A/2625A AC Voltage Inputs2-Wire Accuracy Maximum Current Through SensorAppendices 2620A/2625A Crest Factor ErrorDC Component Error Input ImpedanceAppendices Ohms Inputs2-Wire Accuracy Input ProtectionFrequency Range Frequency Inputs2620A/2625A SensitivityTypical Scanning Rate AppendicesA-11 Digital Inputs Maximum Autoranging TimeTotalizing Input 2620A/2625AIsolation Trigger InputAppendices ThresholdEnvironmental Digital and Alarm OutputsReal-Time Clock and Calendar Battery LifeAppendices GeneralWeight AltitudePower 2625A Data Storage2620A Options 2620A/2625AASCII & IEEE-488 Bus Codes Appendix BASCII & BUS CODES Implementation of IEEE Standard IEEE-488.2 Devise Documentation RequirementsAppendix C The initial power-up device setting is Channels 0 - 20OFFDigital I/O lines high non-alarm Totalizer 0, with debounce disabled Alarm parameters Limit-1 and Limit-2 OFF. All limit valuesAlarm assignments Channels 0-3 assigned to outputs 0-3,respectively Open Thermocouple Detection OTC enabledAppendices COMMAND MESSAGE UNIT QUERY MESSAGE UNIT COMMAND PROGRAM HEADERThe following queries return data in two formats ALARMLIMIT? PROGRAM MESSAGE UNIT PROGRAM MESSAGE UNIT SEPARATOR2620A/2625A The *CAL? command not implemented an optional commandThe *RDT and *RDT? commands are not implemented There are no device-to-device messagesOperation complete is generated when the command is parsed Appendices2620A/2625A Appendix D Signal Cross Talk in a DC Voltage ChannelMaking Mixed Measurements IntroductionAC Signal Cross Talk Into a Frequency Channel AC Signal Cross Talk Into an AC Voltage ChannelAC Signal Cross Talk Into an Ohms Channel Ratio worst case5.0 × AC Signal Crosstalk Into a Temperature ChannelTEMPERATURE Error Ratio = ⎢ 2.0 ×2620A/2625A Decoding the ASCII String Binary Upload of Logged Data LOGBIN? 2625A onlyAppendix E Introduction2620A/2625A Figure E-1. ASCII String DecodingFloating Point Conversion AppendicesExample 2620A/2625AAppendices Figure E-2. Floating Point Conversion2620A/2625A Figure E-3. ExampleConnections RS-232 CablingAppendix F CablesPRINTER 2620A/2625ARS43 PRINTERRS43 CABLE NULL MODEM RTS - REQUEST TO SEND CTS - CLEAR TO SEND RI - RING INDICATORAppendices DCD Rx Tx DTR GND DSR RTS CTS RIRS40 CABLE OR EQUAL 2620A/2625ARx Tx DTR GND DSR RTS CTS Tx Rx RTS CTS DSR GND DCDAppendices Figure F-4. Hydra DB-9 to Modem DB-25 RS-232 ConnectionRS42 CABLE OR EQUAL 2620A/2625ARx Tx DTR GND DSR RTS CTS Tx Rx RTS CTS DSR GND DCDFigure F-6. RS-232 DB9 and DB-25 Connectors Appendices2620A/2625A Hydra Configuration Record Index