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87 V/AN

Digital Multimeter

Service Manual

PN 2153596
July 2004

© 2004 Fluke Corporation, All rights reserved. Printed in USA
All product names are trademarks of their respective companies.

Limited permission for the U.S. Government to reproduce Fluke
Item #2153596 is provided pursuant to FAR 52.227.14 Alt. II.

Summary of Contents for 87 V/AN

Page 1: ...6 July 2004 2004 Fluke Corporation All rights reserved Printed in USA All product names are trademarks of their respective companies Limited permission for the U S Government to reproduce Fluke Item 2...

Page 2: ...vice center to obtain return authorization information then send the product to that service center with a description of the difficulty postage and insurance prepaid FOB Destination Fluke assumes no...

Page 3: ...r Supply and Voltage Reference 10 Function Selection and Overload Protection 11 Analog Signal Conditioning 13 VAC 13 VDC 14 mVDC 14 Temperature 14 Ohms Below the 6 M Range 14 Ohms in the 6 M 50 M Rang...

Page 4: ...Circuitry 22 Replacing the Fuses 23 Required Equipment 24 Performance Tests 24 Basic Operability Tests 25 Testing the Fuses 25 Testing the Display 25 Testing the Pushbuttons 27 Testing Meter Accuracy...

Page 5: ...nce and Diode Function Specifications 7 7 Frequency Counter Specifications 7 8 Frequency Counter Sensitivity and Trigger Levels 8 9 Electrical Characteristics of the Terminals 8 10 MIN MAX Recording S...

Page 6: ...87 V AN Service Manual iv...

Page 7: ...Block Diagram 10 2 Opening the Meter Battery and Fuse Replacement 20 3 Removing LCD Mask to Access LCD 21 4 Testing the Current Input Fuses 23 5 Display Features 25 6 Restoring the Default Password 3...

Page 8: ...87 V AN Service Manual vi...

Page 9: ...g static sensitive devices The 87 V AN Service Manual provides the following information Safety information Specifications Theory of operation Basic maintenance cleaning replacing the battery and fuse...

Page 10: ...ter read all associated safety information Make sure you have complete understanding of all safety issues Precautions and Safety Information In this manual a Warning identifies conditions and actions...

Page 11: ...disconnecting the common test lead 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...

Page 12: ...Double insulated R Continuity test or continuity beeper tone E Capacitance t Underwriters Laboratories G Diode CAT III IEC overvoltage category III CAT III equipment is designed to protect against tra...

Page 13: ...light off Vibration Per MIL PRF 28800 for a Class 2 instrument Shock 1 Meter drop per IEC 61010 1 2001 Size HxWxL 1 25 in x 3 41 in x 7 35 in 3 1 cm x 8 6 cm x 18 6 cm Size with Holster and Flex Stand...

Page 14: ...5 kHz 4 A residual reading of up to 13 digits with leads shorted will not affect stated accuracy above 3 of range 5 Specification increases from 1 at 200 Hz to 6 at 440 Hz when filter is in use Table...

Page 15: ...the ac functions the Meter may display a residual reading between 1 and 30 counts A 30 count residual reading will cause only a 2 digit change for readings over 3 of range Using REL to offset this re...

Page 16: ...100 pF 120 dB at dc 50 Hz or 60 Hz 60 dB at 50 Hz or 60 Hz F mV 1000 V rms 10 M 100 pF 120 dB at dc 50 Hz or 60 Hz 60 dB at 50 Hz or 60 Hz K 1000 V rms 10 M 100 pF ac coupled 60 dB dc to 60 Hz Full Sc...

Page 17: ...s selected that puts the signal to be measured within the dynamic range of the analog to digital converter ADC or other signal conditioning circuits like the RMS to DC converter discussed in RMS to DC...

Page 18: ...e battery to the power supply regulators when the Meter is turned on When S1 is in the OFF position Q14 is off to allow the battery voltage to turn off Q13 via R73 When the Meter is turned on S1 makes...

Page 19: ...the signal conditioning circuit as required for the respective Meter functions The Meter schematic symbols for each of the sections of S1 have the functions that correspond to the closed positions li...

Page 20: ...9 997 M U1 3 clamps U1 pin 1 RT1 R1 CR10 VR1 CR8 CR9 R85 U1 1 clamps mL d mV dc Temperature S1 4 5 Z2 RV3 RV2 RT1 R1 CR10 VR1 CR8 CR9 U1 pin 36 RT1 R1 CR10 VR1 CR8 CR9 R3 U1 36 clamps U1 pin 3 RT1 R1...

Page 21: ...t shunts R4 R5 R6 and the closed contacts of S1 are protected by F1 opening CR1 CR2 limit the voltage at the mA A input to approximately 2 1 V regardless of the Meter function selected thereby protect...

Page 22: ...as in mVDC to FE_O U1 pin 19 with the exception that U1 provides a gain of 10 to the signal Another measurement of the temperature of the input terminals where the thermocouple wire transitions to cop...

Page 23: ...capacitor is discharged to below a value set on the comparator via ISRC U1 pin 36 which is connected to COMMON or the negative voltage rail depending on how much voltage is on the capacitor being meas...

Page 24: ...e 1 M 800 Hz Low Pass Filter R86 R87 R88 C36 C37 C38 U4 form an 800 Hz low pass filter three pole Butterworth that can be selected in the VAC function This filter is used to stop high frequency noise...

Page 25: ...sses high frequency noise Diode CR5 provides protection in case F1 is open R10 R11 C26 CR6 provide the same function for the A input with the COMMON connection via R6 R97 R98 allow the Meter model and...

Page 26: ...inations of segments and back planes are used R20 R25 R26 R27 R41 RT2 form a temperature compensated voltage divider used to generate the four voltage levels used by the display multiplexer internal t...

Page 27: ...e battery or fuses Repairs or servicing covered in this manual should be performed only by qualified personnel Cleaning the Meter XWWarning To avoid possible electric shock personal injury or damage t...

Page 28: ...n counterclockwise 3 The case bottom is secured to the case top by three screws and two internal snaps at the LCD end Using a Phillips head screwdriver remove the three screws WCaution To avoid damagi...

Page 29: ...ween the LCD and the PCA These connectors usually stick to the LCD when it is removed If the connectors are to be reused do not handle them as the electrical contact points might become contaminated U...

Page 30: ...place the battery as follows refer to Figure 2 1 Turn the rotary knob to OFF and remove the test leads from the terminals 2 Remove the battery door by using a standard blade screwdriver to turn the ba...

Page 31: ...le 17 MIN MAX RANGE REL Hz AutoHOLD Peak MIN MAX 4 DIGITS 1 Second C F OFF mA A mV V V A A mA COM V 400mA FUSED 10A MAX FUSED A TRUE RMS MULTIMETER 87 V LO LO MIN MAX RANGE REL Hz AutoHOLD Peak MIN MA...

Page 32: ...mV to 6V rms Accuracy 5 Fluke 5500A Multi Product Calibrator or equivalent Range 1 100 M Accuracy 0 065 TC Adapter Accessory K type Fluke 80 AK K type Thermocouple K type mini plug on both ends Perfo...

Page 33: ...or for the analog bar graph A TrigY Positive or negative slope indicator for Hz duty cycle triggering B X The continuity beeper is on C W Relative REL mode is active D g Smoothing is active E Indicate...

Page 34: ...resolution Q Manual The Meter is in manual range mode R The number of segments is relative to the full scale value of the selected range In normal operation 0 zero is on the left The polarity indicat...

Page 35: ...0 V 2 5 kHz 323 0 to 337 0 9 1000 V 500 V 60 Hz 494 to 506 10 K AC Volts 1000 V 1000 V 1 kHz 986 to 1014 11 600 mV 150 mV 99 95 kHz 99 93 to 99 97 12 K Hz AC Volts Frequency 600 mV 150 mV 199 50 kHz 1...

Page 36: ...1000 V 400 V 800 Hz 4 226 to 340 4 47 Max 5 896 to 6 104 48 L Peak Min Max 6 V 8 Vpp 2 kHz Sq Wave DC offset 2 V Min 1 898 to 2 102 49 0 C 1 0 to 1 0 50 mL Temperature 3 100 C 98 0 to 102 0 51 Press b...

Page 37: ...should display Z CAL 2 Press D once to see the calibration counter For example n001 3 Turn the rotary knob to OFF Calibration Adjustment Password To start the Calibration Adjustment Procedure the cor...

Page 38: ...ttom case See Opening the Meter Case XWWarning To avoid electrical shock or personal injury remove the test leads and any input signal before removing the Meter s top case 3 Through an access hole pro...

Page 39: ...again to start the password entry The Meter displays 4 Press 4 buttons to enter the password 5 Press D to go to the first calibration step The Meter displays C 01 if the password is correct If the pa...

Page 40: ...V 20 kHz C 03 6 000 V 60 Hz C 04 6 000 V 20 kHz C 05 60 00 V 60 Hz C 06 60 00 V 20 kHz C 07 600 0 V 60 Hz K AC Volts C 08 600 0 V 10 kHz C 09 6 000 V 0 Hz C 10 60 00 V 0 Hz L DC Volts C 11 600 0 V 0 H...

Page 41: ...XFER with Window 2073992 89536 2073992 1 MP6 Case Bottom 2073871 89536 2073871 1 MP8 Knob Switch PAD XFER 2100482 89536 2100482 1 MP9 Detent Knob 822643 89536 822643 1 MP10 11 Foot Non Skid 824466 89...

Page 42: ...AN Service Manual 34 F2 F1 MP8 H1 4 BT1 H5 6 MP5 MP6 Holster MP15 AC72 Option Alligator Clips S2 MP22 TL75 Test Lead Set MP1 W Tilt Stand MP2 U5 MP31 MP4 MP8 CR6 axp015 eps Figure 7 87 V AN Final Asse...

Page 43: ...APACITOR SMR CAP CER 0 01UF 10 50V X7R 1206 747261 04222 12061C103KAT1A 2 C32 35 CAPACITOR SMR CAP CER 1000PF 10 50V X7R 0603 605342 04222 06035C102KAT2A 4 C36 CAPACITOR CERAMIC 2700PF 5 50V C0G 1206...

Page 44: ...STOR CERMET 10M 1 0 1W 400PPM 0805 TAPE 943659 18612 CRCW 0805 1005F RT2 2 R12 RESISTOR CERMET 3 01K 1 0 125W 100PPM 0805 TAPE 1591278 18612 CRCW08053011FRT1 1 R14 R99 RESISTOR SMR RES CERM 5 62K 1 0...

Page 45: ...CERM 32 4 1 0 1W 100PPM 0805 641974 18612 CRCW 0805 32R4F RT1 1 R100 101 RESISTOR SMR RES CERM 499K 1 0 1W 100PPM 0805 944285 18612 CRCW 0805 4993F RT1 2 R105 RESISTOR SMR RES CERM 2 8K 1 063W 100PPM...

Page 46: ...4HCT4053 5V 140 OHMS TRIPPLE SPDT TSSOP16 TAPE 2064876 01295 CD74HCT4053PWR 1 U14 IC LOGIC 7S08 2 0V 6 0V SINGLE AND GATE SC70 5 TAPE 2075176 07263 NC7S08P5X 1 VR1 ZENER UNCOMP MMSZ5237B 8 2V 5 20MA 5...

Page 47: ...39 Digital Multimeter Schematic Diagrams Figure 8 A1 LED PCA 8X 5 4001...

Page 48: ...Amps 2 1W 010 R6 TP4 MUXSW2 R30 C6 6 NOLOAD 100P NOLOAD C47 0 001U 220 OHM TP7 1000V AC LPSW LOWPASS C1 C0 C R1 1K 5 0 5 10MM Z2 2 5MM 2 910V 1 5MM 0 001U C33 2 5 R94 499K R52 249K 100P C56 100K 8 8MM...

Page 49: ...13 12 3 2 1 20 21 40 U11 C51 C50 20 19 22 16 15 18 S1 28 23 26 25 24 23 14 9 S1 10 9 S1 C17 R98 R97 R99 Q17 R96 6 5 2 12 13 4 3 16 15 10 9 8 7 1 14 11 U3 TP19 TP22 TP18 TP21 TP20 TP14 TP17 TP16 TP15 T...

Page 50: ...87V AN Service Manual 42...

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