Fluke 12 Service Manual Download Page 1

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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.

Summary of Contents for 12

Page 1: ... 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 ...

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Page 3: ...uct 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...

Page 4: ...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 repl...

Page 5: ...peration 2 3 2 3 Analog Measurement IC U1 2 3 2 4 Microcomputer IC U2 2 3 2 5 VCHEK Input Resistance 2 3 3 Maintenance 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 4 Replaceable 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 ...

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Page 7: ... 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 ...

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Page 9: ...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 ...

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Page 12: ...1 1 Chapter 1 Introduction and Specifications Title Page 1 1 Introduction 1 3 1 2 Specifications 1 3 ...

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Page 14: ...blication 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 18 C to 28 C 6...

Page 15: ...oltage category III EMI Regulations Complies with FCC Part 15 Class B and VDE 0871B Accuracy 50 to 400 Hz Function Range Resolution Model 10 Models 11 12 Volts AC 4000 mV 1 mV 2 9 3 1 9 3 4 000V 0 001V 2 9 3 1 9 3 40 00V 0 01V 2 9 3 1 9 3 400 0V 0 1V 2 9 3 1 9 3 600V 1V 2 9 3 1 9 3 Volts DC 4000 mV 1 mV 1 5 2 0 9 2 4 000V 0 001V 1 5 2 0 9 2 40 00V 0 01V 1 5 1 0 9 1 400 0V 0 1V 1 5 1 0 9 1 600V 1V ...

Page 16: ...c to 60 Hz Resistance Open Circuit Test Voltage Full Scale Voltage To 4 0 MΩ 40 MΩ Short Circuit Current 600V rms 1 5V dc dc 450 mV 1 5V dc 500 uA Diode 600V rms 2 4 3 0V dc 2 400V dc 0 95 mA typical 3 x 106 V Hz Maximum Models 11 and 12 only MIN MAX Recording with Elapsed Time Model 12 Only Specified accuracy of the measurement function 12 digits for changes 200 ms in duration 40 digits in ac Typ...

Page 17: ...2 1 Chapter 2 Theory of Operation Title Page 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 ...

Page 18: ...10 11 12 Multimeters Service Manual 2 2 ...

Page 19: ...he 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 bidirecti...

Page 20: ...ive Filter Components R7 R8 C5 C6 Passive Filter Components R9 C7 AC to DC Converter Gain Resistors R11 R12 R13 AC to DC Converter AC Coupling Capacitor C8 Bias Current Setting Resistor R2 DGND VSS Voltage Setting Resistors R10 R24 Power Supply Bypass Capacitors C3 C15 Reverse Battery Protection CR1 System Clock Y1 VCHEK Input Current Limiters R16 R18 R29 VCHEK input Positive Temp Coef Thermistor ...

Page 21: ...eference voltage for de integrate signal in volts 16 BIAS Pin for analog bias current generator reference resistor 17 REFH Connects 1 235V reference voltage to on chip circuits 18 BGND Not used 19 AFO Active filter high output pin 2 pole low pass filter 20 FAO Internal active filter node 21 FAI Internal active filter node 22 AFI Active filter high input pin 23 VSS Negative power supply voltage 3V ...

Page 22: ...3 1000 to 1 voltage divider and 10 kΩ reference resistor input 45 APV4 10 000 to 1 voltage divider and 1 kΩ reference resistor input 46 DGND Ground power supply pin connected to common digital ground 47 DATA3 Most significant bidirectional data bus line 48 DATA2 Bit 2 of parallel data bus 49 DATA1 Bit 1 of parallel data bus 50 DATA0 Least significant bidirectional data bus line 51 N C No connectio...

Page 23: ...Resistance 2 2 7 500 100 50 10 5 1 0 1 0 5 1 0 5 0 10 0 5 0 500 0 SMALL SIGNAL INPUT RESISTANCE kΩ Vin Vdc POSITIVE DCV INPUT NEGATIVE DCV INPUT ana01f eps Figure 2 1 Typical VCHEK Input Resistance with DC Volts Function Selectedcance ...

Page 24: ...3 1 Chapter 3 Maintenance Title Page 3 1 Introduction 3 3 3 2 Disassembly and Reassembly 3 3 3 3 Cleaning 3 6 3 4 Performance Tests 3 6 3 5 Calibration 3 7 ...

Page 25: ...10 11 12 Multimeters Service Manual 3 2 ...

Page 26: ...Lift the battery from the case bottom and insert a new 9V battery NEDA 1604 6F22 or 006P Be sure the positive and negative battery posts are oriented correctly 5 TO REMOVE THE PCA A1 Insert a small flat blade screwdriver between the edge of the case top and the pca where shown in Figure Gently unsnap a side of the case top from the pca Repeat on the other side of the pca Unsnap the case from the t...

Page 27: ...OMERIC CONTACT STRIP SWITCH MP9 TOP SHIELD MP7 SWITCH SUPPORT MP6 MAIN PRINTED CIRCUIT ASSEMBLY A1 SHOCK ABSORBER MP10 9V BATTERY BT1 CASE BOTTOM MP8 4 PHILLIPS HEAD SCREWS H1 4 NON SKID FOOT MP11 BOTTOM SHIELD MP9 SIDE SWITCH ACTUATOR MP5 SWITCH ASSEMBLY S2 CASE TOP DECAL MP4 ana02F eps Figure 3 1 Disassembled Unit ...

Page 28: ...Maintenance Disassembly and Reassembly 3 3 5 1 2 3 SNAP SNAP SNAPS ana03f eps Figure 3 2 Removing and Reinserting the Printed Circuit Assembly ...

Page 29: ...tions will react with the plastics used in the instruments Do not get the LCD wet To clean the case wipe it with a cloth lightly dampened with water and a mild detergent Wash the pca with isopropyl alcohol or hot deionized water and a soft brush Do not use detergent of any kind for cleaning the pca The pca must be completely dry before the meter is reassembled Dry the pca with clean dry air at low...

Page 30: ... 000V dc range 2 Connect the calibrator to the and COM jacks on the Meter 3 Apply an input of 4 000V dc 0 25 The meter display should read between 3 997 4 003V If it does not adjust R4 see Figure 3 3 as follows To adjust R4 1 Remove any input signals to the meter 2 Remove the four screws on the back and separate the case bottom and case top Notice that when you do so the battery remains in the cas...

Page 31: ...8 400 0V AC 350V 80Hz Center 339 5 360 5 9 600V AC 600V 400Hz Center 580 620 10 4 000V DC 0V Center 0 002 0 002 11 40 00V DC 20 mV DC Center 00 01 00 03 12 400 0V DC 200 mV DC Center 000 3 000 1 13 4 000V DC 3 5V Center 3 445 3 555 14 40 00V DC 35V DC Center 35 54 34 46 15 400 0V DC 100V DC Center 98 4 101 6 16 600V DC 600V DC Center 610 590 17 Continuity 2V DC Right 1 968 2 032 18 400 0Ω 0 0Ω Rig...

Page 32: ...ight 0 0 0 2 23 400 0Ω 1 0Ω Right 0 8 1 2 24 400 0Ω 350 0Ω Right 346 6 353 4 25 4 000 kΩ 1 0 kΩ Right 0 990 1 010 26 40 00 kΩ 35 kΩ Right 34 67 35 33 27 400 0 kΩ 100 kΩ Right 99 0 101 0 28 4 000 MΩ 2 9 MΩ Right 2 873 2 927 29 40 00 MΩ 35 MΩ Right 34 44 35 56 30 Ω VCHEK 1 96V DC Right 1 940 1 980 31 1 000µF 0 0µF Right 0 001µF 0 001µF 32 1 000µF 0 95µF Right 0 93µF 0 970µF MIN MAX tests are for Flu...

Page 33: ...10 11 12 Multimeters Service Manual 3 10 _ 9V BATTERY CLIP TO BASE OF CONTACTS ADJUST R4 FOR 3 997 4 003V DC INPUT RECEPTACLES anao4f eps Figure 3 3 Calibration Adjustment ...

Page 34: ...4 1 Chapter 4 Replaceable Parts and Schematics Title Page 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 ...

Page 35: ...10 11 12 Multimeters Service Manual 4 2 ...

Page 36: ...damaged by static discharge 4 2 How To Obtain Parts Electrical components may be ordered directly from the manufacturer by using the manufacturers part number or from the John Fluke Mfg co Inc and its authorized representatives by using the part number under the heading FLUKE STOCK NO In the U S order directly from the Fluke Parts Dept by calling 1 800 526 4731 Parts price information is available...

Page 37: ...USA contact a Fluke service center A list of service centers is at the end of Section 4 NOTE w This instrument may contain a Nickel Cadmium battery Do not mix with the solid waste stream Spent batteries should be disposed of by a qualified recycler or hazardous materials handler Contact your authorized Fluke service center for recycling information WARNING THIS INSTRUMENT CONTAINS A FUSIBLE RESIST...

Page 38: ...843 89536 897843 1 S 2 SWITCH ASSEMBLY 89536 1 5 TM 1 USERS MANUAL ENGLISH FLUKE 10 900196 89536 900196 1 TM 2 USERS MANUAL ENG INTL FLUKE 10 900204 89536 900204 1 TM 3 UERSS MANUAL ENGLISH FLUKE 11 12 900191 89536 900191 1 TM 4 USERS MNL GER ITA JPN FL 11 12 900209 89536 900209 1 TM 5 USERS MNL ENG FRN SPN FL 11 12 900212 89536 900212 1 U 3 LCD 3 5 DIGIT MULTIPLEXED 855226 62786 855226 1 Notes Y ...

Page 39: ...10 11 12 Multimeters Service Manual 4 6 MP3 MP2 J3 U3 J4 MP7 MP6 A1 MP10 BT1 MP8 H1 4 MP11 MP7 MP9 MP5 S2 MP4 ana05f eps Figure 4 1 Final Assembly Drawing ...

Page 40: ... 1 J 1 2 RECEPTACLE INPUT 878988 89536 878988 2 LS 1 AF TRANSD PIEZO 20MM 876995 59096 59096 KBS 20DB 2T 5 1 Q 1 Y TRANSISTOR SI NPN SELECT IEBO SOT 23 821637 04713 SMBT1388LT1 1 Q 2 Y TRANSISTOR SI PNP SELECT ICER SOT 23 887179 04713 SMBT1531LT1 1 R 1 Y RES CERM 162K 1 125W 100PPM 1206 876198 91637 CRCW1206 1623FB 1 2 R 2 RES MF 332K 1 0 125W 100PPM 655217 59124 MF50D3323F 1 R 3 RES MF 23 4K 0 1 ...

Page 41: ...7 CRCW1206 104FB 1 RT 1 THERMISTOR POS 1 1K 20 25 C 867192 54583 911P67E112MW07 1 2 S 1 SWITCH SLIDE 3 POSITION 5 PIN 868117 79727 868117 1 U 1 ARTIC ASSEMBLY TESTED 858472 89536 858472 1 U 2 Y IC CMOS 4 BIT MPU LCD CNTRLR 80PN QFP 866913 33297 UPD75304GF XXX 3B9 1 VR 1 Y IC 1 23V 150 PPM T C BANDGAP V REF 634451 12040 LM385Z 1 2D26Z 1 XBT 1 2 CONTACT BATTERY 897777 89536 897777 2 Y 1 RESONATOR CE...

Page 42: ...Replaceable Parts and Schematics Warranty and Service Centers 4 4 9 ana06f eps Figure 4 2 A1 Main PCA Components ...

Page 43: ...10 11 12 Multimeters Service Manual 4 10 ana07f eps Figure 4 3 Fluke 10 Schematic ...

Page 44: ...Replaceable Parts and Schematics Warranty and Service Centers 4 4 11 ana08f eps Figure 4 3 Fluke 10 Schematic cont ...

Page 45: ...10 11 12 Multimeters Service Manual 4 12 ana09f eps Figure 4 4 Fluke 11 Schematic ...

Page 46: ...Replaceable Parts and Schematics Warranty and Service Centers 4 4 13 ana10f eps Figure 4 4 Fluke 11 Schematic cont ...

Page 47: ...10 11 12 Multimeters Service Manual 4 14 ana11f eps Figure 4 5 Fluke 12 Schematic ...

Page 48: ...Replaceable Parts and Schematics Warranty and Service Centers 4 4 15 ana12f eps Figure 4 5 Fluke 12 Schematic cont ...

Page 49: ...10 11 12 Multimeters Service Manual 4 16 FEDERAL SUPPLY CODES FOR MANUFACTURES ...

Page 50: ...Replaceable Parts and Schematics Warranty and Service Centers 4 4 17 SERVICE CENTERS ...

Page 51: ...10 11 12 Multimeters Service Manual 4 18 SERVICE CENTERS CONT ...

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