Fluke 77 Uživatelský manuál

®77 Series IIIMultimeterService ManualPN 800604November 1998 Rev.1, 11/99© 1998,1999 Fluke Corporation. All rights reserved. Printed in U.S.A.All prod

1-1Chapter 1Introduction andSpecificationsContents Page1-1. Introduction... 1-31-2. Org

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Introduction and SpecificationsIntroduction11-31-1. IntroductionThis manual presents service information for the Fluke 77 Series IIIMultimeter. The ma

77 Series IIIService Manual1-41-3. ConventionsThrough the manual, certain notational conventions are used. A summary ofthese conventions follow:• Ins

Introduction and SpecificationsSpecifications11-5Table 1-1. SpecificationsMaximum Voltage Between anyTerminal and Earth GroundRated voltageDisplay Dig

77 Series IIIService Manual1-6Table 1-1. Specifications (cont)Function Range AccuracyL3.200 V32.00 V320.0 V1000 V±(0.3%+1)±(0.3%+1)±(0.3%+1)±(0.4%+1)m

Introduction and SpecificationsSpecifications11-7Overload protection for all functions and ranges: Rated voltage.Function Input Impedance (Nominal)L,

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2-1Chapter 2Theory of OperationContents Page2-1. Introduction... 2-32-2. Functional Blo

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iTable of ContentsChapter Title Page1 Introduction and Specifications... 1-11-1. Introduction ...

Theory of OperationIntroduction22-32-1. IntroductionThis chapter contains a brief overview of the 77 Series III Multimeter,followed by a more detailed

77 Series IIIService Manual2-4The pins of Z1 are used as follows:Z1-PIN NUMBER FUNCTION1 input3 3.2V range tap4 32V range tap5 320V range tap6 1000V d

Theory of OperationDetailed Description22-52-9. Active FilterAn active filter that includes R9, R10, C5, and C6 is located in U1.Conditioned input si

77 Series IIIService Manual2-6Conditioned input signals are routed to the a/d converter in U1, where they areintegrated. The reference voltage develop

Theory of OperationDetailed Description22-7ACACACACACFILTERFILTERR10C11 C5 C6C8C7C9++R18R19R17R916 17 28 26 39 40 27 44 4510 9 8 46 47INPUTDIGITALSE

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3-1Chapter 3MaintenanceContents Page3-1. Introduction... 3-33-2. PCA Access and Gene

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MaintenanceIntroduction33-3 WarningThese service instructions are for use by qualifiedpersonnel only. To avoid electric shock, do notperform any servi

77 Series IIIService Manual3-41. Set the function switch to OFF, and disconnect test leads if they areinstalled.2. Remove the four Phillips screws f

77 Series IIIService Manualii3-10. Diode Test ... 3-93-11. DC mA Test ...

MaintenanceCleaning33-5Clean the instrument case with a mild detergent and water.The pca may be washed with isopropyl alcohol or deionized water and a

77 Series IIIService Manual3-6Decal WindowCase Top LCD WindowMask BracketLCDElastomeric ConnectorInternal CoverShaft AdapterAC ShieldMain PCAScre

MaintenancePerformance Test33-73-5. Performance TestPerformance tests are recommended for incoming inspection, periodicmaintenance, and for verifying

77 Series IIIService Manual3-8Table 3-2. DC Voltage TestStep DC Input Voltage Display Reading1 +2.7V 2.691 to 2.709V DC2 +27V 26.91 to 27.09V DC3 +270

MaintenanceAC Voltage Test33-9Referring to Table 3-4, set the Ohms Calibrator or Decade Resistor to theresistance value indicated in steps 1 through 6

77 Series IIIService Manual3-10Table 3-4. Resistance TestStep Input Resistance Display Reading1 short 0.0 to 0.3ΩDecades of 1:2 100Ω 99.2 to 100.8Ω (p

MaintenanceTroubleshooting33-11Table 3-5. DC mA TestStep Input Current Display Reading1 +27 mA 26.57 to 27.43 DC2 +200 mA 196.8 TO 203.2 DC3-12. DC A

77 Series IIIService Manual3-12Turn meter onDoes meter power up?1.ONYESCheck:a. Power supplies TP1 = 3.1V dc +/-0.1V TP3 = 1.5V dc U1 pin

MaintenanceTroubleshooting33-133-15. Supplemental Troubleshooting Procedures3-16. Checking the Crystal OscillatorConnect an oscilloscope or counter

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iiiList of TablesTable Title Page1-1. Specifications ... 1-52-1. S1 Function Codes..

Static Awareness -1Some semiconductors and custom IC's can bedamaged by electrostatic discharge duringhandling. This notice explains how you canm

Static Awareness-25. USE STATIC SHIELDING CONTAINERS FOR HANDLING AND TRANSPORT.6. DO NOT SLIDE S.S. DEVICES OVER ANY SURFACE.7. AVOID PLASTIC,V

4-1Chapter 4List of Replaceable PartsContents Page4-1. Introduction... 4-34-2. How t

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List of Replaceable PartsIntroduction44-34-1. IntroductionThis section contains an illustrated list of replaceable parts for 77 Series IIIMultimeter.4

77 Series IIIService Manual4-44-5. Manual Status InformationThe following Manual Status Information table defines the assembly revisionlevels that ar

List of Replaceable PartsParts Lists44-5Table 4-1. Final AssemblyRef Des Description Fluke PN Qty NotesA1 MAIN PCA NA 1BT1 BATTERY,9V,0-15MA 696534 1D

77 Series IIIService Manual4-6MP6MP17MP18MP20DS1MP21MP19MP12MP9A1H2MP23MP14H7MP4 MP5 MP11MP16MP10S2H1F1F2BT1MP40LS1FLUKE-77-3aaa05c.epsFigure 4-1. Fin

List of Replaceable PartsParts Lists44-7Table 4-2. A1 Main PCARef Des Description PN Qty. NotesC1 CAP,POLYES,0.0UF, ±10%,1000V 822361 1C2,C3 CAP,CER,0

77 Series IIIService Manual4-8Table 4-2. A1 Main PCA (cont)Ref Des Description PN Qty. NotesXF2 CONTACT, FUSE 707190 2Y1 CRYSTAL,32.768KHZ, ±+-1%,3 X

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List of Replaceable PartsParts Lists44-9FLUKE 77-3-4001aaa06f.epsFigure 4-2. A1 Main PCA

77 Series IIIService Manual4-10FLUKE 77-3-4001aaa07f.epsFigure 4-2. A1 Main PCA (cont.)

5-1Chapter 5Schematic Diagrams

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Schematic Diagrams55-3Table 5-1. AbbreviationsAbbreviation DefinitionACA AC Converter FeedbackACHI AC Converter HighACL All Clear, ResetACLO AC Conver

77 Series IIIService Manual5-4FLUKE 77-3-4001aaa06f.epsFigure 5-1. A1 Main PCA

Schematic Diagrams55-5FLUKE 77-3-4001aaa07f.epsFigure. A1 Main PCA (cont)

77 Series IIIService Manual5-6CWR8100K300MAGUARDGUARDOHSGUARDV0GUARDGUARDGUARDV1V4GUARDV2V3RRSDCSAM0AMIGUARDGUARDGUARDMVCOMLOS11210MZ1734561.0K10K101K

Schematic Diagrams55-70.22C13VDDBT19V1000V,300CODEFUNCTIONINTINTLOWHIGHMA,10AINTK0AZK1AFOFAOCONVERTERFA(-)AFIACLOACHIACAB3B1B2B0+VDDTEST-VSSBPRXTAL2XT

77 Series IIIService Manual5-8TP3HOLDHVBTDCKM+/-AC1D1E1A2D2E2A2B3B3A3E3DMAN4C4AAUTOBG1BG5BG3BG9BG7BG11BG13BG15BG17BG19BG21BG25BG23BG29BG27BG31H0H1LCD-

vList of FiguresFigure Title Page2-1. Overview ... 2-32-2. AC and A/D Convert

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SAFETY-1OPERATOR SAFETYINFORMATIONThis instrument has been designed and tested in accordance with IECPublication 348, Safety Requirements for Electron

SAFETY-2Symbols Marked on Equipment DANGER — High VoltageAttention — refer to the manual. This symbol indicates thatinformation about the usage of a f