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Digital Multimeter

Schematic Diagrams

P5.5/R13

P5.6/R23

P5.7/R33

R03

VEREF

VeREF-

VREF-/

VREF

XOUT/TCLK

P4.2/STE1/S39

DVCC2

XT2IN

RST*/NMI

DVCC

URXD1/P4.1

P4.3/SIMO1/S38

UTXD1/P4.0

AVCC

XT2OUT

P1.2/TA1

P1.3/TBOUTH/SVSOUT

P1.4/TBCLK/SMCLK

TCK

TDI

TMS

XIN

S10

S9
S8
S7
S6
S5
S4
S3
S2

S11

S17
S16
S15
S14
S13
S12

S18

S19

S20

S21

S23
S22

S33
S32

P3.0/STE0

P3.1/SIMO0

P3.3/UCLK0

P3.4/TB3

P3.5/TB4

P3.6/TB5

P3.7/TB6

P2.0/TA2

P2.1/TB0

P2.2/TB1

P2.3/TB2

P2.4/UTXD0

P2.5/URXD0

P2.6/CAOUT

P2.7/ADC12CLK

P1.0/TA0

P1.1/TA0/MCLK

P1.5/TACLK/ACLK

P1.6/CA0

P1.7/CA1

P6.0/A0

P6.1/A1

P6.2/A2

P6.3/A3

P6.4/A4

P6.5/A5

P6.6/A6

TDO/TDI

P4.7/S34

P4.6/S35

P4.5/UCLK/S36

P4.4/SOMI1/S37

S24

S25

S26

S27

S28

S29

S30

S31

P6.7/A7/SUSIN

P5.0/S1
P5.1/S0

COM1/P5.2

COM3/P5.4

COM2/P5.3

COM0

AVSS

DVSS1

DVSS2

P3.2/SOMI0

VIN

GND

VIN

REF

VCC

SCK

SDO

B32
B30
B25

B10

---
X34
___

B27

B22

B18

B17
BT2
B15
B8

H4
5D
---

B11

B12

AUTO

B20

S35
S34
S33
S32
S31

S29

S30

S28

S10
S9
S8
S7

S11

S13
S12

S15
S14

S16

S19
S18
S17

S20

S21

S25
S24
S23
S22

S26

S27

S4
S3
S2
S1

X19
X18

X21

DEG_F

X13

X12

DEG_C

---
---
X10
X20
MV

MIN

BT0
X32
X1

BT1

BT3

X22

BT4
B31
B24

AC
---
X9

MAX

2G
2B
3G
3B
4G
4B
5G

X36

B16
B14

X37

B23

X23

X17

X7
X5
---
X14

X15

AVG

---

2E
2C
3E
3C
4E
4C

5C
---

1B,C

B19
X28
B13

B6
B3
X30
X33
X35

X29

B21

X26

X24

X11

B29
B26

B28

MAN

X25

X16

LOCATE C18, C19 NEAR PIN 100, TRACE TO 98

BACKLIGHT

PUSHBUTTON SWITCHES

BKLT

TP36 PB3/BTXD

TP35 BRXD

TP32,33 RST*
TP34,38 +0.8

RSOB POSITION

IR COMMUNICATION

4.5 DIGIT LCD

TEST POINTS

REF DES NAME

TP12 GND

TP37 MODEL

BEEP

CAL

TP25 TDO

TP14 BACKLIGHT BOOTLOAD

DEVELOPMENT ONLY

TP24 TXD

TP5 S1-1
TP6 S1-6

TP18 LCD_R23

TP20 SWPOS

Ohms

CONVERTER

TP2 S1-14

TP10 S1-5

TP9 S1-8

TP4 S1-3

TP1 S1-9

TP7 S1-7
TP8 S1-8

OFF

COMPARE TO 1.2 V

REL

BEEPER

Diode Test

uAmps

mVDC

mA/Amps

TP21 VRSOB

TP17 +2.5

TP15 BTP
TP16 POWER

RANGE

MINMX

SHIFT

A/D

HOLD

VAC

VDC

MOMENTARY ON

C21,22 NEAR U3

TP19 LCD_R13

TP11 S1-4

TP3 S1-10

MODEL

SERIAL COMM

FLASH / BOOT

LCD COMPENSATION

TP13 Vbe

LOCATE C25, C29 NEAR PIN 1 AND 60, TRACE TO 99

MICROPROCESSOR

LOCATE C17, C27 NEAR PIN 10, TRACE TO 98

TP23 RXD

JTAG

TP22 LOWBATT

MODEL SELECTION

TP31 TCK

TP29,30 TMS

TP28 -2.5

TP26,27 TDI

REF DES NAME

POWER SUPPLY

LCD_R23

-2.5

NSCW100

DS3

TPS71533

3.3V

GND

OUT

R16

C28

BTP

C57

R110

R109

TP38

R108

TP37

11
10

9
8
7
6

39
38
37
36
35
34

33
32
31
30
29
28
27
26
25
24

23
22
19
18
17
16
15
14
13
12

3
2

U11

C51

C50

C17

R98

R97

R99

Q17

R96

TP19

TP22

TP18

TP21

TP20

TP14

TP17

TP16

TP15

TP3

TP2

TP1

Q12

TP24

TP23

TP33

TP30

TP27

TP36

TP35

TP34

TP32

TP31

TP29

TP28

TP26

TP25

U14

R84

R62

R73

R74

C18

11 10

21
20
19
18
17
16

51
50
49
48
47
46
45
44
43
42

41
40
39

37
36
35
34
33
32

31
30
29
28
27
26
25
24
23
22

13
12

59
58
57
56

6
5
4
3
2

97
96
95

62
63

65
66
67
68
69
70
71

72
73
74
75
76
77
78
79

80
81
82
83
84
85
86
87

100

C29

R68

C27

R80

Q13

Q14

R47

R44

C11

R53

R54

R55

R58

R59

R60

R61

C20

R22

R50

R46

R43

R40

S10

R64

C24

R63

R65

R66

DS1

DS2

Q11

Q10

R41

RT2

R27

R20

R25

R26

U10

C21

C22

R15

R31

S11

C16

C13

C12

C15

C14

R19

LS1

CR3

R14

C25

R21

C19

10U

NOLOAD

LCD40P

GF1B

1.00M

BTM

+0.8

VIN

IRLML6302

TCK

TDO

+0.8

RST*

TMS

TDI

-2.5

PB6

PB1

7S08

SEG25

0.1U

SEG16
SEG15

SEG10

SEG23

1.00K

MAJACK

4.7U

RXD

MMBT5089

LPSW

LOWBATT

SWPOS

AJACK

FASTADIN

MODEL

10V

-2.5

0.1U

10U

0.1U

GND

OUT

VOUT

1.00M

40.2K

BPR

LTC2435-1

1.00M

100K

12.1

MMBT5089

ADIN

100K

226K

0.1U

GND

845K

-2.5

10V

0.1U

100K

SWPWR

PB4

PB6

+0.8

-2.5

200K

BKLT

32.4

5.62K

HIBEAM

0.1U

1.00M

-2.5

SWPOS

100K

MMBT5089

CD4069

BTP

100K

-2.5

BTM

100K

50.0K
5%

100K

21.0K

100K

4.32K

LCD_R33

LCD_R23

LCD_R13

LCD_R03

-2.5

0.1U

49.9K

+2.5

-2.5

BTP

DOUT

ADCS*

ADSCK

MMBT3906

4.7K

100

SFH426

10.0K

MMBT5089

SFH325FA

MMBT5089

0.0082U

+0.8

TXD

-2.5

RXEN

COM2

COM3

COM1

-2.5

LCD_R13

LCD_R03

ACS*

SEG29

SEG30

SEG28

SEG27

SEG26

SEG24

SEG22

SEG21

SEG20

SEG19

SEG17

SEG18

SEG16

SEG15

SEG14

SEG12

SEG13

SEG11

SEG10

SEG9

SEG7

SEG8

SEG6

SEG5

SEG4

SEG3

TDI

TMS

TDO

PB2

RST*

ASCK

10U
10V

10V

SEG31

SEG32

SEG33

-2.5

DCMP

10.0K

+0.8

NOLOAD

SEG4
SEG3
SEG2
SEG1
SEG0

SEG27

SEG24

SEG25

SEG26

SEG23
SEG22

SEG19

SEG20

SEG21

SEG18
SEG17

SEG14

SEG11

SEG9

SEG7

SEG8

SEG6
SEG5

SEG28

SEG30
SEG29

COM1

SEG31

SEG13
SEG12

SEG2

SEG1

SEG0

MODEL

475K

CD4069

0.0

ADSCK

LCD_R33

COM0

SEG33
SEG32

ADCS*

COM0

APOR*

DIN

0.1U

-2.5

475K

MMBT5089

RXEN

+0.8

COM3

COM2

NOLOAD

+0.8

-2.5

32.768KHZ

TPS77050

5.0V

100K

NOLOAD

100P

NOLOAD

10.0

NOLOAD

470P

CD4069

PB5

V5*

DOUT

ICNTL

TCK

SMCLK

MSP430F448

5.62K

1.00K

BPR

AC*

BKLT

TXD

RXD

PB5

PB4

BRXD

PB3/BTXD

MUXSW2

HIBEAM

PB3/BTXD

BRXD

SWPWR

LOWPASS

+0.8

PB2

PB1

PB3/BTXD

ODCMP

1.00K

4.7U

+2.5

100P

10.0

-2.5

16V

10U

47U

-2.5

LOWBATT

V5*

0.01U

LT1790

2.5V

MMBT3904

8X-5-1001

(2 of 2)

Figure 8. A1 LED PCA (cont)

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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