FLUKE_8842A_Instruction 电路图.pdf

8842A Digital Multimeter Instruction Manual PN 879309 Date December 1991 Rev.3 7/96 1999 Fluke Corporation, All rights reserved. Printed in USA All product names are trademarks of their respective companies. RadioFans.CN 收音机爱 好者资料库 RadioFans.CN 收音机爱 好者资料库 i Table of Contents ChapterTitlePage 1Introduction and Specifications. 1-1 1-1.INTRODUCTION. 1-2 1-2.THE 8842A DIGITAL MULTIMETER. 1-2 1-3.OPTIONS AND ACCESSORIES. 1-2 1-4.SPECIFICATIONS . 1-3 2Operating Instructions. 2-1 2-1.INTRODUCTION. 2-2 2-2.INSTALLATION. 2-2 2-3.Installing the Power-Line Fuse . 2-2 2-4.Connecting to Line Power. 2-2 2-5.Adjusting the Handle. 2-3 2-6.Rack Mounting Kits. 2-3 2-7.OPERATING FEATURES. 2-4 2-8.Power-Up Features. 2-4 2-9.Front and Rear Panel Features . 2-4 2-10.Display Features. 2-8 2-11.Error Messages. 2-8 2-12.Overrange Indication. 2-10 2-13.Diagnostic Self-Tests. 2-10 2-14.Ranging. 2-10 2-15.AUTORANGE. 2-10 2-16.MANUAL RANGE. 2-11 2-17.Triggering. 2-11 2-18.CONTINUOUS TRIGGER MODE . 2-11 2-19.EXTERNAL TRIGGER MODE. 2-11 2-20.Reading Rates and Noise Rejection. 2-11 2-21.Automatic Settling Time Delay. 2-12 2-22.External Trigger Input (Option -05 Only). 2-12 2-23.Sample Complete Output (Option -05 Only). 2-12 2-24.MAKING MEASUREMENTS. 2-13 2-25.Input Overload Protection Limits. 2-13 2-26.Measuring Voltage and Resistance. 2-13 2-27.Measuring Current . 2-13 RadioFans.CN 收音机爱 好者资料库 8842A Instruction Manual ii 2-28.Current Fuse Protection. 2-13 2-29.Offset Measurements . 2-14 2-30.EXTERNAL CLEANING. 2-15 3Remote Programming. 3-1 3-1.INTRODUCTION. 3-3 3-2.CAPABILITIES. 3-3 3-3.BUS SET-UP PROCEDURE. 3-3 3-4.AN OVERVIEW OF REMOTE OPERATION. 3-4 3-5.A NOTE ABOUT EXAMPLES. 3-6 3-6.DEVICE-DEPENDENT COMMAND SET. 3-6 3-7.Bn (Offset Commands). 3-9 3-8.Cn (Calibration Commands). 3-9 3-9.Dn (Display Commands). 3-9 3-10.Fn (Function Commands) . 3-10 3-11.Get Commands. 3-10 3-12.G0 (Get Instrument Configuration). 3-12 3-13.G1 (Get SRQ Mask). 3-12 3-14.G2 (Get Calibration Prompt). 3-12 3-15.G3 (Get User-Defined Message). 3-13 3-16.G4 (Get Calibration Status). 3-13 3-17.G5 (Get IAB Status). 3-14 3-18.G6 (Get YW Status). 3-14 3-19.G7 (Get Error Status). 3-14 3-20.G8 (Get Instrument Identification). 3-14 3-21.N (Numeric Entry Command). 3-15 3-22.Put Commands. 3-15 3-23.P0 (Put Instrument Configuration). 3-15 3-24.P1 (Put SRQ Mask). 3-16 3-25.P2 (Put Calibration Value). 3-16 3-26.P3 (Put User-Defined Message). 3-17 3-27.Rn (Range Commands). 3-17 3-28.Sn (Reading Rate Commands). 3-17 3-29.Tn (Trigger Mode Commands). 3-17 3-30.Wn (Terminator Commands). 3-19 3-31.X0 (Clear Error Register Command). 3-19 3-32.Yn (Suffix Commands). 3-19 3-33.Z0 (Self-Test Command) . 3-19 3-34.(Device-Clear Command). 3-20 3-35.? (Single-Trigger Command). 3-20 3-36.INPUT SYNTAX. 3-20 3-37.Definitions. 3-20 3-38.Input Processing. 3-21 3-39.Syntax Rules . 3-23 3-40.OUTPUT DATA. 3-24 3-41.Loading Output Data. 3-24 3-42.Types of Output Data. 3-25 3-43.Numeric Data and Error Messages. 3-25 3-44.MEASUREMENT DATA. 3-25 3-45.OVERRANGE INDICATION. 3-26 3-46.ERROR MESSAGES. 3-26 3-47.Status Data . 3-26 3-48.Output Priority . 3-26 3-49.SERVICE REQUESTS. 3-27 Contents (continued) iii 3-50.The Serial Poll Register . 3-27 3-51.The SRQ Mask. 3-28 3-52.INTERFACE MESSAGES. 3-29 3-53.Address Messages. 3-29 3-54.Universal Commands. 3-29 3-55.Addressed Commands. 3-30 3-56.TALK-ONLY MODE. 3-30 3-57.REMOTE CALIBRATION. 3-31 3-58.TIMING CONSIDERATIONS. 3-31 3-59.IMMEDIATE MODE COMMANDS. 3-31 3-60.EXAMPLE PROGRAMS. 3-32 4Measurement Tutorial. 4-1 4-1.INTRODUCTION. 4-2 4-2.DC VOLTAGE MEASUREMENT. 4-2 4-3.Circuit Loading Error. 4-2 4-4.Input Bias Current Error. 4-3 4-5.RESISTANCE MEASUREMENT . 4-4 4-6.2-Wire Ohms. 4-4 4-7.Correcting for Test Lead Resistance in 2-Wire Ohms. 4-5 4-8.4-Wire Ohms. 4-5 4-9.Applications of the Ohms Functions. 4-7 4-10.TESTING DIODES. 4-7 4-11.TESTING ELECTROLYTIC CAPACITORS. 4-7 4-12.A PRECISION CURRENT SOURCE. 4-8 4-13.DC CURRENT MEASUREMENT . 4-8 4-14.REDUCING THERMAL VOLTAGES. 4-9 4-15.AC VOLTAGE AND CURRENT MEASUREMENT. 4-10 4-16.True RMS Measurement. 4-10 4-17.Waveform Comparison. 4-10 4-18.Crest Factor. 4-12 4-19.AC-Coupled AC Measurements . 4-12 4-20.Combined AC and DC Measurements. 4-13 4-21.Bandwidth. 4-13 4-22.Zero-Input VAC Error. 4-13 4-23.MAKING ACCURATE MEASUREMENTS ON THE 20 mV AND 20 RANGES . 4-14 4-24.MAKING ACCURATE HIGH-RESISTANCE MEASUREMENTS. 4-15 5Theory of Operation. 5-1 5-1.INTRODUCTION. 5-3 5-2.OVERALL FUNCTIONAL DESCRIPTION. 5-3 5-3.DETAILED CIRCUIT DESCRIPTION . 5-4 5-4.DC SCALING. 5-4 5-5.VDC Scaling. 5-6 5-6.VDC Protection. 5-7 5-7.mA DC Scaling. 5-7 5-8.Analog Filter. 5-7 5-9.TRACK/HOLD CIRCUIT . 5-8 5-10.Track Configuration. 5-10 5-11.Settling Configuration. 5-11 5-12.Hold Configuration. 5-11 5-13.Pre-Charge Configuration. 5-11 5-14.PRECISION VOLTAGE REFERENCE. 5-11 8842A Instruction Manual iv 5-15.OHMS CURRENT SOURCE. 5-12 5-16.OHMS PROTECTION. 5-13 5-17.OHMS FUNCTIONS. 5-13 5-18.2-Wire Ohms. 5-13 5-19.4-Wire Ohms. 5-15 5-20.A/D CONVERTER. 5-15 5-21.Timing/Data Control. 5-17 5-22.Precision DAC . 5-18 5-23.A/D Amplifier. 5-18 5-24.Bootstrap Supplies . 5-18 5-25.DISPLAY. 5-19 5-26.KEYBOARD. 5-19 5-27.DIGITAL CONTROLLER. 5-19 5-28.In-Guard Microcomputer.