Agilent Technologies U2741A Uživatelská příručka

Agilent TechnologiesAgilent U2741A USB Modular 5.5 Digits Digital MultimeterUser’s GuideUser's Guide.book Page I Friday, August 8, 2008 9:11 A

X U2741A User’s GuideProduct Regulations Performance Criteria IEC 61326-1:2002 / EN 61326-1:1997+A1:1998+A2:2001+A3:2003CISPR 11:1

U2741A User’s Guide XIContents1 Getting Started 1Introduction 2Product at a Glance 3Product Outlook 3Product Dimensions 5Dimensions without Bumpers 5D

XII U2741A User’s GuideContents2 Operation and Features 27Powering Up 28Making Measurements 29Measuring DC Voltage 29Measuring AC Voltage 31Measuring

ContentsU2741A User’s Guide XIII4 Characteristics and Specifications 63Product Characteristics 65Product Specifications 67Frequency specifications 70T

XIV U2741A User’s GuideContentsUser's Guide.book Page XIV Friday, August 8, 2008 9:11 AM

U2741A User’s Guide XVList of FiguresFigure 1-1 55-pin backplane connector pin configuration 25Figure 3-1 Common mode source error 49Figure 3-2 Ground

XVI U2741A User’s GuideContentsUser's Guide.book Page XVI Friday, August 8, 2008 9:11 AM

U2741A User’s Guide XVIIList of TablesTab le 1 -1 SSI connector pin description 25Tab le 2 -1 Default settings summary 43Tab le 3 -1 Thermoelectric

XVIII U2741A User’s GuideContentsUser's Guide.book Page XVIII Friday, August 8, 2008 9:11 AM

1Agilent TechnologiesU2741A USB Modular 5.5 Digits Digital Multimeter User’s Guide1Getting StartedIntroduction 2Product at a Glance 3 Product Out

II U2741A User’s GuideNotices® Agilent Technologies, Inc. , 2008No part of this manual may be reproduced in any form or by any means (including elec-t

2 U2741A User’s Guide1Getting StartedIntroductionThe Agilent U2741A is a 5.5 digits digital multimeter that can operate as standalone or as a modular

Getting Started 1U2741A User’s Guide 3Product at a GlanceProduct Outlook Top v ie wBumpersUser's Guide.book Page 3 Friday, August 8, 2008 9:1

4 U2741A User’s Guide1Getting StartedFront viewRear viewUSB IndicatorPower IndicatorFuse holder4-wire Ω Lo Sense4-wire Ω Hi SenseVOLT HIVOLT LO55-pin

Getting Started 1U2741A User’s Guide 5Product DimensionsDimensions without BumpersTop v ie wFront view105.00 mm175.00 mm11.50 mm25.00 mmUser's G

6 U2741A User’s Guide1Getting StartedDimensions with BumpersTop v ie wFront view180.00 mm8.60 mm41.00 mm117.00 mmUser's Guide.book Page 6 Frid

Getting Started 1U2741A User’s Guide 7Standard Purchase ItemsVerify that you have received the following items with your unit. If anything is missing

8 U2741A User’s Guide1Getting StartedInspection and MaintenanceInitial InspectionWhen you receive your U2741A, inspect the unit for any obvious damage

Getting Started 1U2741A User’s Guide 9General MaintenanceGeneral maintenance1 Power off your module and remove the power cord and I/O cable from your

10 U2741A User’s Guide1Getting StartedInstallation and ConfigurationInstallationFollow the step-by-step instructions shown in the following flowchart

Getting Started 1U2741A User’s Guide 11A. Check Your SystemPrior to any installation or configuration, please ensure that your PC meets the following

U2741A User’s Guide IIISafety SymbolsThe following symbols on the instrument and in the documentation indicate precautions which must be taken to main

12 U2741A User’s Guide1Getting StartedB. Install the IO Libraries Suite The IO Libraries Suite 14.2 or higher is available on the Agilent Automation-R

Getting Started 1U2741A User’s Guide 13C. Install the Module Driver1 Verify that your PC meets the minimum system requirements as stated in “A. Check

14 U2741A User’s Guide1Getting Started4 If the menu does not launch automatically, go to Start > Run (on the Windows Start menu) and type <drive

Getting Started 1U2741A User’s Guide 153 If the installation menu does not appear after a few seconds, go to Start > Run and type <drive>:\Ap

16 U2741A User’s Guide1Getting StartedE. Connect the Module to Your PC1 After the installations have completed, connect the power cord to the AC/DC po

Getting Started 1U2741A User’s Guide 175 Select Install the software automatically (Recommended) and click Next.6 A warning message will appear on th

18 U2741A User’s Guide1Getting Started7 Click Finish to complete the installation.8 The Assign USB device alias window will appear. Each time the U2

Getting Started 1U2741A User’s Guide 199 The system will perform a firmware version check on your connected module. a If the module firmware version i

20 U2741A User’s Guide1Getting Startedc Click Yes to begin the firmware download. The following message box will appear indicating the download in pr

Getting Started 1U2741A User’s Guide 21F. Verify Your Module ConnectionThe Agilent Connection Expert is one of the utilities in the IO Libraries. The

IV U2741A User’s GuideGeneral Safety InformationWARNING• Do not use the device if it is damaged. Before you use the device, inspect the casing. Look f

22 U2741A User’s Guide1Getting Started5 A successful communication between the Connection Expert and the U2741A will indicate that the instrument is i

Getting Started 1U2741A User’s Guide 23G. Launch Your Agilent Measurement Manager1 Double-click the Measurement Manager software icon on your desktop

24 U2741A User’s Guide1Getting StartedNOTEFor more information on how to use the Measurement Manager, refer to the Agilent Measurement Manager help fi

Getting Started 1U2741A User’s Guide 25Instrument Configuration55-Pin Backplane Connector Pin ConfigurationThe 55- pin backplane connector is used whe

26 U2741A User’s Guide1Getting StartedChassis InstallationThe L-Mount kit is to be installed to your U2741A module.The following instructions describe

27Agilent TechnologiesU2741A USB Modular 5.5 Digits Digital MultimeterUser’s Guide2Operation and FeaturesPowering Up 28Making Measurements 29 Mea

28 U2741A User’s Guide2 Operation and FeaturesPowering UpTake note of the following when you power up the U2741A.• The U2741A can only be operated via

Operation and Features 2U2741A User’s Guide 29Making MeasurementsThe following pages show how to make measurement connections and how to select measur

30 U2741A User’s Guide2 Operation and FeaturesAgilent Measurement Manager operationSelect the DCV function and desired range. A suitable range should

Operation and Features 2U2741A User’s Guide 31Measuring AC VoltageThe AC voltage measurement function has the following features:• Five ranges to sele

U2741A User’s Guide VEnvironmental ConditionsThis instrument is designed for indoor use and in an area with low condensation. The table below shows th

32 U2741A User’s Guide2 Operation and FeaturesSCPI commandsThe following example shows how to make an AC voltage measurement using SCPI commands.MEASu

Operation and Features 2U2741A User’s Guide 33SCPI commandsThe following example shows how to make a DC current measurement using SCPI commands.MEASur

34 U2741A User’s Guide2 Operation and FeaturesSCPI commandsThe following example shows how to make an AC current measurement using SCPI commands.MEASu

Operation and Features 2U2741A User’s Guide 35The following figure shows a four- wire resistance measurement connection.Agilent Measurement Manager op

36 U2741A User’s Guide2 Operation and FeaturesMeasuring FrequencyThe frequency measurement function has the following features:• Range is based on the

Operation and Features 2U2741A User’s Guide 37Testing ContinuityThe continuity testing function has the following features:• Uses a 1 mA ± 0.2% consta

38 U2741A User’s Guide2 Operation and FeaturesTesting D iodesThe diode testing function has the following features:• Uses a 1 mA ± 0.2% constant curr

Operation and Features 2U2741A User’s Guide 39Measuring TemperatureThe temperature measurement function has the following features:• The measurement r

40 U2741A User’s Guide2 Operation and FeaturesSCPI commandsThe following example shows how to make a temperature measurement using SCPI commands.MEASu

Operation and Features 2U2741A User’s Guide 41Restoring Instrument StateThe U2741A automatically saves the last configuration whenever a power- down e

VI U2741A User’s GuideRegulatory MarkingsThe CE mark is a registered trademarkof the European Community. This CEmark shows that the product complieswi

42 U2741A User’s Guide2 Operation and FeaturesRangingYou can let the digital multimeter automatically select the range using auto range or you can sel

Operation and Features 2U2741A User’s Guide 43Default Settings The table below summarizes the U2741A's settings as received from the factory, at

44 U2741A User’s Guide2 Operation and FeaturesTriggering the U2741AAt power- up, the default trigger source is immediate. To make a measurement, the f

Operation and Features 2U2741A User’s Guide 45The INITiate command changes the state of the triggering to wait- for-trigger state. Measurements will

46 U2741A User’s Guide2 Operation and FeaturesSystem-Related OperationThis section provides information on system- related topics such as performing a

47Agilent TechnologiesU2741A USB Modular 5.5 Digits Digital MultimeterUser’s Guide3Measurement TutorialDC Measurement Considerations 48Noise Rejection

48 U2741A User’s Guide3 Measurement TutorialDC Measurement ConsiderationsThermal EMF errorsThermoelectric voltages are the most common source oferror

Measurement Tutorial 3U2741A User’s Guide 49Noise RejectionRejecting power-line noise voltagesAn important property of integrating analog- to- digital

50 U2741A User’s Guide3 Measurement TutorialNoise caused by magnetic loopsIf you are making measurements near magnetic fields, it is a good practice t

Measurement Tutorial 3U2741A User’s Guide 51Figure 3-2 Ground loop induced errorThe best way to eliminate ground loops is to isolate the digital multi

U2741A User’s Guide VIIWaste Electrical and Electronic Equipment (WEEE) Directive 2002/96/ECThis instrument complies with the WEEE Directive (2002/96/

52 U2741A User’s Guide3 Measurement TutorialResistance Measurement ConsiderationsWhen measuring resistance, the test current flows from the input HI t

Measurement Tutorial 3U2741A User’s Guide 53Removing test lead resistance errorsTo eliminate offset errors associated with the test lead resistance in

54 U2741A User’s Guide3 Measurement TutorialIf power dissipation is a problem, you should select the digital multimeter's next higher measurement

Measurement Tutorial 3U2741A User’s Guide 55AC MeasurementsTrue RMS AC measurementsTrue RMS responding digital multimeter, like the U2741A, measure th

56 U2741A User’s Guide3 Measurement TutorialThe digital multimeter's AC voltage and AC current functions measure the AC- coupled true RMS value,

Measurement Tutorial 3U2741A User’s Guide 57For the best AC noise rejection, you should perform the DC measurement at 20 NPLC.True RMS accuracy and hi

58 U2741A User’s Guide3 Measurement TutorialOther Primary Measurement FunctionsFrequency Measurement ErrorsThe U2741A uses a reciprocal counting techn

Measurement Tutorial 3U2741A User’s Guide 59Figure 3-3 Burden voltage in current measurement VbRs LOIRIdealMeterVs Error(%) = –100% x VbVsVs = Source

60 U2741A User’s Guide3 Measurement TutorialOther Sources of Measurement ErrorLoading errors (AC volts)In the AC voltage function, the input of the di

Measurement Tutorial 3U2741A User’s Guide 61High-voltage self-heating errorsIf you apply more than 300 Vrms, self-heating occurs in the digital multim

VIII U2741A User’s GuideIn This Guide…1 Getting StartedThis chapter provides an overview of the U2741A USB modular digital multimeter, the product out

62 U2741A User’s Guide3 Measurement TutorialMake sure the digital multimeter and the AC source are connected to the same electrical outlet whenever po

63Agilent TechnologiesU2741A USB Modular 5.5 Digits Digital MultimeterUser’s Guide4Characteristics and SpecificationsProduct Characteristics 65Product

64 U2741A User’s Guide4 Characteristics and SpecificationsWhen using the multimeter in an environment where electromagnetic interference or significan

Characteristics and Specifications 4U2741A User’s Guide 65Product CharacteristicsREMOTE INTERFACE • Hi-Speed USB 2.0• USBTMC 488.2 Class devicePOWER

66 U2741A User’s Guide4 Characteristics and Specifications[1] Applicable for NPLC >1[2] Applicable for NPLC 0.2 and 0.02Measurement Category The U2

Characteristics and Specifications 4U2741A User’s Guide 67Product SpecificationsDC specifications [1]Ta bl e 4 - 1 DC accuracy Function Range Input im

68 U2741A User’s Guide4 Characteristics and Specifications[1] Specifications are based on 30 minutes warm-up time, NPLC 20 resolution, and calibration

Characteristics and Specifications 4U2741A User’s Guide 69300 VDC. [3] Additional error to be added as frequency more than 30 kHz and signal input les

70 U2741A User’s Guide4 Characteristics and SpecificationsFrequency specifications [1][1] Frequency measurement can only be done in auto range mode. S

Characteristics and Specifications 4U2741A User’s Guide 71Temperature specificationsTa bl e 4 - 8 Temperature accuracyFunction Thermistor type Range

U2741A User’s Guide IXDECLARATION OF CONFORMITY According to EN ISO/IEC 17050-1:2004Generic example Manufacturer’s Name: Agilent Technologies Microwav

72 U2741A User’s Guide4 Characteristics and SpecificationsUser's Guide.book Page 72 Friday, August 8, 2008 9:11 AM

® Agilent Technologies, Inc. , 2008First Edition, July 31, 2008U2741-90001www.agilent.comAgilent TechnologiesContact usTo obtain service, warranty or