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27 Multimeter Service Manual For IEC 61010 CAT III Meters Only PN 690206 November 1998 Rev.1, 9/03 1998,2003 Fluke Corporation, All rights reserved. Printed in U.S.A. All product names are trademarks of their respective companies. RadioFans.CN 收音机爱 好者资料库 i Table of Contents ChapterTitlePage 1Introduction and Specifications. 1-1 1-1.Using the Meter Safely. 1-3 1-2.Operating Instructions . 1-4 1-3.Specifications. 1-5 2Theory of Operation. 2-1 2-1.Introduction. 2-3 2-2.Functional Description . 2-3 2-3.Block Diagram Description. 2-3 2-4.Input Overload Protection. 2-4 2-5.Function Switching Circuits. 2-4 2-6.Signal Conditioning Circuits. 2-4 2-7.Custom Analog IC (U1) . 2-4 2-8.Peripherals to U1. 2-6 2-9.Microcomputer Control. 2-6 2-10.Display. 2-7 3Maintenance. 3-1 3-1.Introduction. 3-3 3-2.Service Information . 3-4 3-3.Operator Maintenance . 3-4 3-4.Battery Replacement . 3-5 3-5.Fuse Test. 3-6 3-6.Fuse Replacement. 3-6 3-7.General Maintenance Information. 3-7 3-8.Handling Precautions for Static-Sensitive Devices. 3-7 3-9.Disassembly. 3-7 3-10.Reassembly. 3-10 3-11.Cleaning. 3-12 3-12.Performance Tests . 3-12 3-13.Display Test. 3-12 3-14.Voltage Functions Performance Verification. 3-13 3-15.AC and DC Current Performance Verification. 3-13 3-16.Ohms Function Performance Verification . 3-14 RadioFans.CN 收音机爱 好者资料库 27 Service Manual ii 3-17.Diode Test Performance Verification . 3-15 3-18.Calibration Adjustment. 3-15 3-19.Calibration Preparation . 3-15 3-20.DC Voltage Connection . 3-16 3-21.AC Voltage Calibration. 3-16 3-22.Troubleshooting. 3-17 3-23.Power-Up Self Test. 3-17 3-24.Overall System Check. 3-17 3-25.DC Voltage Signal Tracing. 3-18 3-26.Fault Diagnosis Guide. 3-19 4List of Replaceable Parts. 4-1 4-1.Introduction. 4-3 4-2.How to Obtain Parts. 4-3 4-3.Manual Status Information. 4-3 4-4.Newer Instruments. 4-4 4-5.Service Centers. 4-4 4-6.Parts Lists. 4-5 5Schematic Diagrams. 5-1 RadioFans.CN 收音机爱 好者资料库 iii List of Tables TableTitlePage 1-1.Specifications. 1-5 3-1.Recommended Test Equipment . 3-3 3-2.Replacement Fuses. 3-6 3-3.Ohm Function Performance Test. 3-15 3-4.Fault Diagnosis Guide. 3-19 4-1.Final Assembly. 4-6 4-2.A1 Main PCA. 4-8 4-3.A2 Digital PCA. 4-11 4-4.A4 Digital PCA. 4-12 27 Service Manual iv v List of Figures FigureTitlePage 3-1.Battery and Fuse Replacement. 3-5 3-2.Disassembly . 3-8 3-3.Calibration Adjustment Locations. 3-16 4-1.Final Assembly. 4-7 4-2.A1 Main PCA. 4-10 4-3.A2 Digital PCA. 4-11 4-4.A4 Digital PCA. 4-12 5-1.A1 Main PCA. 5-3 5-2.A2 Digital PCA. 5-7 5-3.A4 Digital PCA. 5-7 27 Service Manual vi 1-1 Chapter 1 Introduction and Specifications TitlePage 1-1.Using the Meter Safely. 1-3 1-2.Operating Instructions . 1-4 1-3.Specifications. 1-5 27 Service Manual 1-2 Introduction and Specifications Using the Meter Safely1 1-3 1-1. Using the Meter Safely Use the meter as described in this manual. Otherwise the safety features provided by the meter might be impaired. A Warning identifies conditions and actions that pose hazards to the user; a Caution identifies conditions and actions that might damage the meter. Read First: Safety Information. Read First: Safety Information This meter complies with EN 61010-1:1993, ANSI/ISA S82.01- 1994 and CAN/CSA C22.2 No. 1010.1-92 Overvoltage Category III. Use the meter only as specified in the Users Manual, otherwise the protection provided by the meter may be impaired. ? ? Warning To avoid possible electric shock or personal injury: Do not use the meter if it is damaged. Before use, inspect the case for cracks or missing plastic. Pay particular attention to the insulation surrounding the connectors. Inspect the test leads for damaged insulation or exposed metal. Check test lead continuity. Replace damaged leads. Do not use the meter if it operates abnormally. Protection may be impaired. When in doubt, have the meter serviced. Do not operate the meter around explosive gas, vapor or dust. Do not apply more than the rated voltage, as marked on the meter, between terminals or between any terminal and earth ground. Before each use, verify the meters operation by measuring a known voltage. When servicing the meter, use only specified replacement parts. Use caution when working above 30 V ac rms, 42 V ac peak, or 60 V dc. Such voltages pose a shock hazard. Keep your fingers behind the finger guards on the probe when making measurements. Connect the common test lead before connecting the live test lead. Disconnect the live test lead first. Remove test leads from the meter before opening the battery door. Make sure the battery door is closed and latched before operating the meter. Use only a single 9 V battery, properly installed in the meter case, to power the meter. 27 Service Manual 1-4 Follow all equipment safety procedures. Before measuring current, check the meters fuses (see “How to Test the Fuse”). Never touch the probe to a voltage source when the test leads are plugged into the 10 A or 40 mA input jacks. To avoid false readings, which could lead to possible electric shock or personal injury, replace the meters battery as soon as the low battery indicator (?) appears. Avoid working alone. Remove all surface water from the product including water around, within and under the rotary knob, input receptacles and buttons prior to connecting to any voltages. ?Caution To avoid possible damage to the meter or to equipment under test: Disconnect the power to the circuit under test and discharge all high voltage capacitors before testing resistance, continuity or diodes. Use the proper function and range for your measurement applications. When measuring current, turn off circuit power before connecting the meter in the circuit. Remember to place the meter in series with the current. This manual presents service information for the Fluke 27 Multimeters. Included are a theory of operation, general maintenance procedures, performance tests, calibration procedures, troubleshooting information, a list of replaceable parts, and a schematic diagram. 1-2. Operating Instructions For operating instructions, refer to the Users Manual provided with the instrument at time of purchase. Introduction and Specifications Specifications1 1-5 1-3. Specifications Instrument specifications are presented in Table 1-1. Table 1-1. Specifications FunctionRangeResolutionAccuracy ? 3.200 V 32.00 V 320.0 V 1000 V 0.001 V 0.01 V 0.1 V 1 V (0.1%+1) (0.1%+1) (0.1%+1) (0.1%+1) ?320.0 mV0.1 mV(0.1%+1) 320.00 ?0.1 ?(0.3%+3)* 3.200 k?0.001 k?(0.2%+1) ? 32.00 k?0.01 k?(0.2%+1) (nS) 320.0 k?0.1 k?(0.2%+1) 3.200 M?0.001 M?(0.2%+1) 32.00 M? 32.00 nS 0.01 M? 0.01 nS (1%+1) (0.2%+10) ? 2.080 V0.001 V(1%+1) typical ? 40 Hz-2 kHz2 kHz -10 kHz10 kHz -30 kHz 3.200 V0.001 V(0.5%+3)(2%+3)(4%+ 10) 32.00 V0.01 V(0.5%+3)(2%+3)(4%+ 10) 320.0 V0.1 V(0.5%+3)(2%+3)(4%+ 10) 1000 V1 V(1%+3)(3%+3)Not Specified ? 320.0 mV0.1 mV(0.5% +3)(2%+3)(4%+10) * When using the REL function to compensate for offsets. FunctionRangeResolutionAccuracyTypical Burden Voltage m?/A 32.00 mA 320.0 mA 10.00 A 0.01 mA 0.1 mA 0.01 A (0.75%+2) (0.75%+2) (0.75%+2) 5.6 mV/mA 5.6 mV/mA 50 mV/A ? A 320.0 A 3200 A 0.1 A 1 A (0.75%+2) (0.75%+2) 0.5 mV/A 0.5 mV/A ? mA/A 40-1000 Hz 32.00 mA 320.0 mA 10.00 A 0.01 mA 0.1 mA 0.01 A (1.5%+2) (1.5%+2) (1.5%+2) 5.6 mV/mA 5.6 mV/mA 50 mV/A ? A 40-1000 Hz 320.0 A 3200 A 0.1 A 1 A (1.5%+2) (1.5%+2) 0.5 mV/A 0.5 mV/A 27 Service Manual 1-6 Table 1-1. Specifications (cont) FunctionOverload Protection* Input Impedance (nominal) Common Mode Rejection Ratio (1 k? unbalance) Normal Mode Rejection ?1000 V rms10 M? in / with 120 dB at dc, 50 Hz, or 60 Hz60 dB at 50 Hz or 60 Hz ?1000 V rms10 M? in / with 120 dB at dc, 50 Hz, or 60 Hz60 dB at 50 Hz or 60 Hz ?1000 V rms 10 M? in / with 60 dB, dc to 60 Hz ?1000 V rms 10 M? in / with 60 dB, dc to 60 Hz ?1000 V rmsOpen Circuit Test Voltage Full Scale Voltage Up to 3.2 M?32 M? or nS <2.8 V dc<420 mV dc28C) Relative Humidity0% to 95% (0C to 35C) 0% to 70% (35C to 55C) Altitude2000 meters Battery Type9 V, NEDA 1604 or 6F22 or 006P Battery Life1000 hrs typical Shock, Vibration and Water Resistance Per MIL-T-28800 for a Style A, Class 2 Instrument Size (HxWxL)2.2 in x 3.75 in x 8 in (5.6 cm x 9.5 cm x 20.3 cm) Weight1.6 pounds (0.75 kg) Waterproof1 meter SafetyComplies with ANSI/ISA S82.01-1994, CAN/CSA 22.2 NO. 1010.1:1992 to 1000 V Overvoltage Category III. UL License pending to UL3111-1. TUV License pending to EN61010-1. 2-1 Chapter 2 Theory of Operation TitlePage 2-1.Introduction. 2-3 2-2.Functional Description . 2-3 2-3.Block Diagram Description. 2-3 2-4.Input Overload Protection. 2-4 2-5.Function Switching Circuits. 2-4 2-6.Signal Conditioning Circuits. 2-4 2-7.Custom Analog IC (U1) . 2-4 2-8.Peripherals to U1. 2-6 2-9.Microcomputer Control.