FLUKE 10_11_12 电路图.pdf

10,11,12 Multimeters Service PN 900824 March 1992 Rev.1, 7/93 1992-1993 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 WARRANTY Fluke warrants to the original product purchaser that each product it manufactures will be free from defects in material and workmanship under normal use and service. The warranty period is controlled by the warranty document furnished with each product and begins on the date of shipment. Flukes warranty does not apply to fuses, batteries, CRTs or any product which, in Flukes opinion, has been misused, altered, neglected, or damaged by accident or abnormal conditions of operation or handling. To obtain warranty service in the USA, call 1-888-99-FLUKE (1-888-993-5853). Outside the USA, contact your nearest Fluke sales or service representative. Fluke assumes no risk for damage in transit. Fluke will, at its option, repair or replace the defective product free of charge or refund the purchase price. However, if Fluke determines that the failure was caused by misuse, alteration, accident, or abnormal condition of operation or handling, you will be billed for the repair and the repaired product will be returned to you transportation prepaid. THIS WARRANTY IS EXCLUSIVE AND IS IN LIEU OF ALL OTHER WARRANTIES, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO ANY IMPLIED WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE OR USE. FLUKE WILL NOT BE LIABLE FOR ANY SPECIAL, INDIRECT, INCIDENTAL, OR CONSEQUENTIAL DAMAGES OR LOSS OF DATA, WHETHER IN CONTRACT, TORT, OR OTHERWISE. Some states do not allow the exclusion or limitation of incidental or consequential damages, or implied warranty periods, so the above limitations may not apply to you. Other rights may vary from state to state. Fluke CorporationFluke Europe B.V P.O. Box 9090P.O. Box 1186 Everett, WA 98206-90905602 BD Eindhoven U.S.A.The Netherlands RadioFans.CN 收音机爱 好者资料库 MULTIMETER SAFETY The Fluke 10, 11, 12 Multimeters have been designed and tested according to IEC Publication 348, Safety Requirements for Electronic Measuring Apparatus. This manual contains information and warnings which must be followed to ensure safe operation and retain the meter in safe condition. Use of this equipment in a manner not specified herein may impair the protection provided by the equipment. These mutimeters comply with part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) these multimeters may not cause harmful interference, and (2) these multimeters must accept any interference received, including interference that may cause undesired operation. Some common international electrical symbols used in this manual are shown below. ? AC - ALTERNATING CURRENT ? DANGEROUS VOLTAGE ? DC - DIRECT CURRENT ? EARTH GROUND ? EITHER AC OR DC CURRENT ? SEE EXPLANATION IN MANUAL ?FUSE? DOUBLE INSULATION FOR PROTECTION AGAINST ELECTRIC SHOCK Before using the meter, read the following safety information carefully. In this manual, WARNING, is reserved for conditions and actions that pose hazard(s) to the user; CAUTION, is reserved for conditions and actions that may damage your meter. Avoid working alone Follow all safety procedures for equipment being tested. Inspect the test leads for damaged insulation or exposed metal. Check test lead continuity. Damaged leads should be replaced. Be sure the meter is in good operating condition. Select the proper function for your measurement. To avoid electrical shock, use caution when working above 60V dc or 30V ac RMS. Disconnect the live test lead before disconnecting the common test lead. Disconnect the power and discharge high-voltage capacitors before testing in and ?. When making a current measurement, turn the circuit power off before connecting the meter in the circuit. Check meter fuses before measuring transformer secondary or motor winding current. An open fuse may allow high voltage build-up, which is potentially hazardous. Use clamp-on probes when measuring circuits exceeding 10 amps. When servicing the meter, use only the replacement parts specified. Do not allow meter to be used if it is damaged or if its safety is impaired. i Table of Contents ChapterTitlePage 1Introduction and Specifications . 1-1 1-1.Introduction. 1-1 1-2.Specifications. 1-1 2Theory of Operation . 2-1 2-1.Introduction. 2-3 2-2.Theory of Operation. 2-3 2-3.Analog Measurement IC (U1). 2-3 2-4.Microcomputer IC (U2). 2-3 2-5.VCHEK Input Resistance. 2-3 3Maintenance. 3-1 3-1.Introduction. 3-3 3-2.Disassembly and Reassembly. 3-3 3-3.Cleaning. 3-7 3-4.Performance Tests. 3-7 3-5.Calibration . 3-8 4Replaceable Parts and Schematics. 4-1 4-1.Introduction. 4-3 4-2.How To Obtain Parts . 4-3 4-3.Schematics. 4-3 4-4.Warranty and Service Centers . 4-4 iii List of Tables TableTitlePage 1-1.Specifications. 1-2 2-1.Electrical Components on Main PCA. 2-4 2-2.U1 Pinout Table . 2-5 3-1.Required Equipment. 3-7 3-2.Performance Tests for Fluke 10. 3-9 3-3.Performance Tests for Fluke 11 and 12. 3-10 4-1.Final Assembly. 4-5 4-2.A1 Main PCA. 4-7 v List of Figures Figure TitlePage 2-1.Typical VCHEK Input Resistance with DC Volts Function Selected . 2-7 3-1.Disassembled Unit. 3-4 3-2.Removing and Reinserting the Printed Circuit Assembly. 3-5 3-3.Calibration Adjustment. 3-10 4-1.Final Assembly Drawing. 4-6 4-2.A1 Main PCA Components. 4-9 4-3.Fluke 10 Schematic. 4-10 4-4.Fluke 11 Schematic. 4-12 4-5.Fluke 12 Schematic. 4-14 1-1 Chapter 1 Introduction and Specifications TitlePage 1-1.Introduction. 1-3 1-2.Specifications. 1-3 Introduction and Specifications Introduction1 1-3 1-1. Introduction WARNING SERVICE PROCEDURES DESCRIBED HEREIN SHOULD BE PERFORMED BY QUALIFIED PERSONNEL ONLY. TO AVOID ELECTRIC SHOCK, PERFORM ONLY THOSE SERVICE PROCEDURES IN THIS INSTRUCTION SHEET. The 10 Series Service Manual provides the information necessary to service the Fluke Model 10, Model 11, and Model 12 Multimeters. The following information is provided in this publication: Specifications (Section 1) Basic theory of operation (Section 2) Disassembly and reassembly (Section 3) Performance tests (Section 3) Calibration (Section 3) Illustrated parts lists and schematic diagram (Section 4) Refer to the Users Manual for operating instructions. 1-2. Specifications Specifications are in Table 1-1. Accuracy is specified for a period of one year after calibration, at 18C to 28C (64F to 82F) with relative humidity to 90%. AC conversions are ac-coupled, average responding, and calibrated to the rms value of a sine wave input. Accuracy specifications are given as: (% of reading + number of least significant digits) 10, 11, 12 Multimeters Service Manual 1-4 Table 1-1. Specifications Maximum Voltage Between any Terminal and Earth Ground 600V ms Display3 3/4-digits, 4000 counts, updates 4/sec Operating Temperature-10C to 50C Storage Temperature-30C to 60C indefinitly (to -40C for 100 hrs) Temperature Coefficient0.1 x (specified accuracy)/C (28C) Relative Humidity0% to 90% (-10C to 35C) 0% to 70% (35C to 50C) Battery Type9V, NEDA 1604 or IEC 6F22 Battery Life650 continious hours with alkaline 450 continious hours with carbon-zinc Shock, Vibration1 meter shock. Per MIL-T-28800D for a Class 3 Instrument Size (HxWxL)1.35 in x 2.75 in x 5.55 in (3.46 cm x 7.05 cm x 14.23 cm) Weight10 oz (286 g) SafetyDesigned to Protection Class II requirement of UL1244, ANSI/ISA-S82, CSA C22.2 No 231, and VDE 0411, and IEC 1010 overvoltage category III. EMI RegulationsComplies with FCC Part 15, Class B, and VDE 0871B. Accuracy (50 to 400 Hz)FunctionRangeResolution Model 10Models 11/12 Volts AC4000 mV*1 mV(2.9%+3)(1.9%+3) 4.000V0.001V(2.9%+3)(1.9%+3) 40.00V0.01V(2.9%+3)(1.9%+3) 400.0V0.1V(2.9%+3)(1.9%+3) 600V1V(2.9%+3)(1.9%+3) Volts DC4000 mV1 mV(1.5%+2)(0.9%+2) 4.000V0.001V(1.5%+2)(0.9%+2) 40.00V0.01V(1.5%+1)(0.9%+1) 400.0V0.1V(1.5%+1)(0.9%+1) 600V1V(1.5%+1)(0.9%+1) Resistance400.00.1(1.5%+2)(0.9%+2) 4.000 k0.001 k(1.5%+1)(0.9%+1) 40.00 k0.01 k(1.5%+1)(0.9%+1) 400.0 k0.1 k(1.5%+1)(0.9%+1) 4.000 M0.001 M(1.5%+1)(0.9%+1) 40.00 M0.01 M(1.9%+3)(1.5%+3) Capacitance1.000 F0.001 FNA(1.9%+2) 10.00 F0.01 FNA(1.9%+2) 100.0 F0.1 FNA(1.9%+2) 1000 F1 FNA(1.9%+2) 10000 F10 FNA(10%+90) Typical Continuity/Diode Test 2.000V0.001V(1.5%+2)(0.9%+2) * The 4000 mV range can only be entered in the manual range mode. Use the 4000 mV range with accessories. * The beeper is guaranteed to come on at 250. The meter detects opens or shorts of 250 s or longer. Introduction and Specifications Specifications1 1-5 Table 1-1. Specifications (cont) FunctionOverload Protection* Input Impedance (Nominal) Common Mode Rejection Ratio (1 k Unbalance) Normal Mode Rejection Volts DC600V rms10 M 2 k 100 dB at dc, 50 Hz, or 60 Hz 50 dB at 50 Hz or 60 Hz Volts AC600V rms5 M 2 k 60 db, dc to 60 Hz ResistanceOpen Circuit Test Voltage Full Scale Voltage To 4.0 M 40 M Short Circuit Current 600V rms<1.5V dc dc <450 mV 1.5V dc200 ms in duration (40 digits in ac). Typical 100 ms response to 80%. Elapsed TimeResolutionAccuracy 0 to 100 hours1 minute0.3% typical (99:59) Continuity Capture (Model 12 Only) Detects opens or shorts of 250 s or longer. 2-1 Chapter 2 Theory of Operation TitlePage 2-1.Introduction. 2-3 2-2.Theory of Operation . 2-3 2-3.Analog Measurement IC (U1). 2-3 2-4.Microcomputer IC (U2). 2-3 2-5.VCHEK Input Resistance. 2-3 10, 11, 12 Multimeters Service Manual 2-2 Theory of Operation Introduction2 2-3 2-1. Introduction Section 2 provides a basic theory of operation for the Series 10 Multimeters. Electrical components on the printed circuit assembly (A1 Main PCA) are listed in Table 2-1. Refer to Figure 4-2 for the location of these components and Figures 4-3 through 4-5 for the schematic diagrams. 2-2. Theory of Operation The analog/digital IC (U1) implements the electrical measurement functions. See Table 2-2 for pin names and descriptions. The microcomputer (U2) controls U1, the LCD (U3), and the user interface. Discrete components support U1 and U2, provide reference standards for measurements, and provide input overload protection. 2-3. Analog Measurement IC (U1) U1 implements the following analog functions: a/d converter, ac to dc converter, VCHEK circuitry (Models 11 and 12 only), active filter, passive filter, power supply, range configuration circuitry, signal routing circuitry, beeper driver, digital control circuitry, and digital U2 interface circuitry. The a/d converter is a patented dual-rate, dual-slope converter. The dual-rate conversion allows for MIN MAX (Model 12 only) and fast autoranging functions. The ac to dc converter is full-wave rectified and average-responding. The active and passive filters are two-pole and one-pole low-pass filters (respectively) that are used for signal filtering prior to a/d conversion. The internal power supply generates a ground voltage nominally +3V relative to VSS. Range configuration circuitry connects the Z1 resistor network as needed for different ranges. Routing circuitry connects the various signal conditioning circuits as needed. The a/d converter and a counter are controlled by a state machine. Finally, digital circuitry interfaces with U2 via a parallel address and bidirectional data bus. Voltage is measured using a ratio comparison of the unknown voltage to the reference voltage (REFI pin). Resistance is calculated using a ratio comparison of the voltage across the unknown resistor to the voltage across