Fluke 8024B User manual

NOTE
This manual documents the Model 8024B and its assemblies at the revision levels
shown in Appendix A. If your instrument contains assemblies with different revision
letters, it will be necessary for you to either update or backdate this manual. Refer to
the supplemental change/errata sheet for newer assemblies, or the backdating sheet
in Appendix Afor older assemblies.
Digital
Multimeter
Instruction Manua
P/N 616052
July 1981
Rev. 15/82
©1982, John Fluke Mfg. Co., all rights reserved. Litho in U.^.A.

Dear Customer:
Congratulations! We at Fluke are proud to presentyou with theModel8024B
Multimeter. This instrument represents the very latest in integrated circuit and
display technology. As aresult, the end product is arugged and reliable
instrument whose performance and design exhibit the qualities of afinely
engineered lab instrument. SECTION TITLE PAGE
To fully appreciate and protect your investment, we suggest you take afew
moments to read the manual. As always, Fluke stands behindyour 8024B with a
full 2-year warranty and aworldwide sendee organization. If the need arises,
please don ’t hesitate to call on us.
Thank you for your trust and confidence.
John Fluke Mfg. Co., Inc.
i
2
INTRODUCTION AND SPECIFICATIONS .. . 1-1
1-1. INTRODUCTION !-!
1-3. SPECIFICATIONS 1-1
OPERATING INSTRUCTIONS 2-1
2-1. INTRODUCTION 2-1
2-3. PREPARING FOR OPERATION 2-1
2-4. Unpacking 2-1
2-7. Battery or Fuse Installation/ Replacement 2-i
2-9. PHYSICAL FEATURES 2-3
2-1 1. OPERATING NOTES 2-6
2-13. Input Overload Protection 2-6
2-15. Input Connection to COMMON 2-6
2-17. Fuse Check 2-7
2-19. Fuse Replacement 2-7
2-21. The Display 2-8
2-26. OPERATION 2-9
2-28. AC/DC Volts (V) Operation 2-9
2-30. AC/ DC Current (mA) Operation 2-9
2-32. Resistance (£2) Operation 2-9
2-34. Continuity Testing 2-13
2-36. Diode Testing 2-13
2-38. Conductance (S) Operation 2-13
2-40. Temperature (°C) Operation 2-13
2-43. Level Detector Operation .i2-16
2-45. Peak Hold Operation 2-17
2-47. INITIAL CHECK-OUT PROCEDURE 2-19
2-49. MEASUREMENT TECHNIQUES 2-21
2-51. Temperature Conversion 2-21
2-53. Conductance-to-Resistance Conversion 2-24
2-55. AC Measurements 2-24
2-57. AC/ DC/ Voltage Measurements 2-24
2-60. AC/ DC Current Measurements ^2-24
i(continued on page ii)

8024
B
8024 B
TABLE OF CONTENTS, continued
SECTION TITLE PAGE
2-64. Resistance Measurements 2-27
2-67. APPLICATIONS 2-29
2-69. THERMOCOUPLES 2-29
2-70. Introduction 2-29
2-73. Monitoring More Than One Thermocouple 2-3!
2-
75. Leakage Tester 2-31
3THEORY OF OPERATION 4-1
3-
1. INTRODUCTION 3-1
3-3. OVERALL FUNCTIONAL DESCRIPTION 3-1
3-5. A/D Converter 3-1
3-14. Voltage Measurement Function 3-6
3-16. Current Measurement Function 3-6
3-18. Temperature (°C) Measurement Function 3-6
3-20. Resistance Measurement Function 3-6
3-23. Conductance Measurement Function 3-3 1
3-25. Peak Hold Circuit Level ;3-11
3-
27. Level Detector Circuit 3-11
4MAINTENANCE., 3-1
4-
1. INTRODUCTION.... .....' 4-1
4-3. SERVICE INFORMATION 4-1
4-7. GENERAL INFORMATION 4-3
4-8. Access Information 4-3
4-17. Cleaning 4-5
4-19. Battery/ Backup Fuse Replacement 4-6
4-21. PERFORMANCE TEST 4-6
4-23. Initial Procedure 4-6
4-25. Display Test 4-7
4-27. Voltage Test 4-8
4-29. Current Test 4-8
4-3 1.Resistance/ Conductance Test 4-8
4-33. Peak Hold Test 4-1
1
4-35. Continuity Test 4-11
4-37. Level Detector Test 4-12
4-39. BT Test 4-12
4-41, Temperature Test 4-14
4-43. CALIBRATION ADJUSTMENTS 4-14
4-
46. TROUBLESHOOTING 4-15
5LIST OF REPLACEABLE PARTS 5-1
5-
1. INTRODUCTION 5-1
5-4. HOW TO OBTAIN PARTS 5-2
TABLE OF CONTENTS, continued
SECTION TITLE PAGE
6ACCESSORIES INFORMATION 6-1
|6-1. INTRODUCTION 6-1
J; 6-3. DELUXE CARRYING CASE (C90) 6-1 '
l6-5. RUGGED CARRYING CASE (Y8I05) ....! \6-1.
|6-7. TYPE KSHEATHED THERMOCOUPLE (Y8102) ... 6-1
6-8. Introduction 6-i
6-10. Specifications 6-4
|6-11. TYPE KBEAD THERMOCOUPLE (Y8103) 6-4
6-12. Introduction 6-4
6-14. Specifications 6-4
6-15. THERMOCOUPLE TERMINATION (Y8I04) 6-4
l6-17. TEMPERATURE PROBES (80T-150C and 80T-150F) .6-5
f; 6-18. Introduction 6-5
i6-20. Specifications 6-5
6-21. HIGH VOLTAGE PROBE (80K-6) 6-5
f- 6-22, Introduction -6-5
6-24. Specifications _6-5
6-25. HIGH VOLTAGE PROBE (80K-40) 6-5
6-26. Introduction 6-5
6-28. Specifications 6-6
6-29. HIGH FREQUENCY PROBE (83RF) 6-6
6-30. Introduction -6-6
6-32. Specifications 6-6
6-33. HIGH FREQUENCY PROBE (85RF) 6-6
j6-34. Introduction 6-6
6-36. Specifications •6-7
6-37. CURRENT TRANSFORMER (801-600) 6-7
h: 6-38. Introduction 6-7
6-40. Specifications 6-7
6-41. CURRENT SHUNT (80J-IO) •6-7
6-42. Introduction 6-7
6-44. Specifications 6-7
6-45. BATTERY ELIMINATOR (A8I) 6-8
6-47. AC/ DC CURRENT PROBE (YRI0O) 6-8
i6-48. introduction 6-8
;6-50. Specifications 6-8
|6-51. AC CURRENT TRANSFORMER (Y8 101) 6-9
6-52. Introduction 6-9
|6-54. Specifications 6-9
j6-55. SAFETY DESIGNED TEST LEAD SET (Y8I32) 6-9
6-57. DELUXE TEST LEAD SET (Y8I34) 6-10
:6-59. SUM FLEX TEST LEAD SET <Y8 140) 6-10
7SCHEMATIC DIAGRAMS -7-1
AMANUAL CHANGE AND BACKDATING INFORMATION A-1
(continued on page Hi)

8024B
8024B
List of Tables
TABLE TITLE PAGE
1-2
1-3
2-1. 2-4
2-7
2-2.
2-3.
2-4.
4-1.
2-22
.2-29
Test Equipment Required 4-2
4-7
4-9
4-10
4-11
4-17
5-3
5-6
5-8
5-12
5-5. Federal Supply Codes for Manufacturers. -5-15
IV
List of Illustrations
FIGURE TITLE PAGE
2-1. Removing the Battery Cover 2-2
2-2. Battery Removal 2-3
2-3. Controls, Indicators, and Connectors 2-4
2-4. Display... -2-8
2-5. Abnormal Status Indicators 2-9
2-6. Volts Operation 2-10
2-7. Current Operation 2-11
2-8. Resistance Operation 2-12
2-9. Conductance Operation 2-14
2-10. Temperature Operation 2-15
2-11. Level Detector Operation •2-17
2-12. Peak Hold Operation 2-18
2-13. Temperature Correction Factor For K-Type
Thermocouples 2-21
2-14. Conductance-to-Rcsistancc Conversion 2-25
2-15. Waveform Conversion —2-26
2-16. Voltage Measurement Error Calculations 2-27
2-17. Current Measurement Calculations 2-28
2-18. Thermocouples. 2-30
2-19. Thermocouple Termination Unit 2-32
2-
20. Multipoint Selection 2-32
3-
1.8024BBlock Diagram -3-2
3-2. A/ DConverter Functional Diagram 3-4
3-3. Integrate Capacitor Waveform •3-5
3-4. Voltage Measurement 3-7
3-5. Current Measurement 3-8
3-6. Temperature Measurement 3-9
3-7. Resistance/ Conductance Measurement 3-10
3-8. Simplified Peak Hold Circuit 3-12
3-
9. Simplified Level Detector Circuit 3-13
4-
1. Calibration Adjustments Location 4-3
4-2. LCD Display Assembly 4-5
v-(continued on page viii)

8024B
LIST OF ILLUSTRATIONS, continued
FIGURE TITLE PAGE
4-3. General Equipment Connection 4-7
4-4. General Equipment Connection —Current 4-10
4-5. BT Test 4-13
4-
6. Lag Bath 4-16
5-
1. 8024B Final Assembly 5-4
5-2. A1 Case Assembly 5-7
5-3. A2 Main PCB Assembly ..5-1
1
5-
4. A3 Switch PCB Assembly 5-12
6-
1. 8024B Accessories 6-2
vt
8024B
Section 1
1-1. INTRODUCTION
ft 1-2. Your John Fluke Model 8024B is apocket-size digital multimeter that is ideally
|i suited for application in the field, laboratory, shop, or home. Some of the features of your
instrument are:
ft FUNCTIONS: All standard VOM measurement functions -- ac/dc voltage, ac/dc
/current, resistance —plus:
§•' Conductance: Anew multimeter function that allows fast, accurate, noise-free
M- resistance measurements up to 10.000 Mil.
HTemperature: Used with aK-type thermocouple, this function provides direct
|| display in degrees Celsius for K-type thermocouples.
|£ Peak-Hold: Provides short-term memory for capturing the peak value of
ft transient ac or dc signals such as motor starting current.
|| Continuity: Provides an immediate visual and audible indication when
§i continuity is detected (use for passive circuit testing).
Level Detector: Senses logic levels and other active signals less than 250V dc or ac
rms. Visual and audible indications of the results are provided.
it RANGE for each function has: )
fFull autopolarity
Overrange indication
fEffective protection from overloads
vDual slope integration measurement technique to ensure noise-free measurements
1-1

8024B 802.4B
OPERATOR CONVENIENCE:
3I/2-digit liquid crystal display: Ahigh contrast display that can be easily read
from across the room. No more worries about bent needles, parallax, etc.
Long term calibration stability: 2years. Easy calibration -few adjustments.
Lightweight: .482 kg(!7 ounces).
Safety Designed Test Leads: Finger guards on the probe and shrouded contacts on
connectors reduce the chance of accidental contact with circuit voltages.
POWER:
Up to 100 hours of continuous operation can be expected from asingle,
inexpensive, 9-volt, alkaline battery (transistor radio/calculator type).
Low battery voltage is automatically detected and displayed. The low battery-
indication, BT, appears in the display when about 10 hours of operation remain.
Line operation is possible using aModel A81 Battery Eliminator. (See Section 6.)
ACCESSORIES:
Afull line of accessories are available to extend the range and scope of your
instrument. They are listed in Table 1-1 and described in detail in Section 6.
1-3. SPECIFICATIONS
1-4. Table 1-2 lists the specifications of your 8024B.
Table 1-1. 8024B Accessories
MODEL NO. DESCRIPTION
C90 Deluxe Carrying Case (Soft Vinyl)
Y8105 Rugged Carrying Case (Molded Plastic)
Y8102 Type KSheathed Thermocouple
Y8103 Type K Beaded Wire Thermocouple
Y8104 Thermocouple Termination Kit
80T-150C Temperature Probe °C
80T-150F Temperature Probe °F
80K-6 High Voltage Probe
80K-40 High Voltage Probe
83RF High Frequency Probe
85RF High Frequency Probe
Table 1-1. 8024B Accessories (cont)
MODEL NO. DESCRIPTION
801-600 Current Transformer, 2" jaw opening
80J-10 Current Shunt
A81 Battery Eliminator
Y8100 AC/DC Current Probe
Y8101 Current Transformer 7/16” jaw opening
Y8132 Safety Designed Test Lead Set
Y8134 Deluxe Test Lead Set
Y8140 Slim Flex Test Lead Set
Table 1-2. 8024B Specifications
The following electrical specifications assume a2-year calibration cycle and
an operating temperature of 18° Cto 28° C(64° Fto 82° F) at relative humidity
up to 90% unless otherwise noted.
FUNCTIONS: DC Volts, AC Volts, DC Current, AC Current, Resistance, Diode
Test, Conductance, Temperature, Peak-Hold, Continuity, and Level Detection.
DC VOLTS
RANGE RESOLUTION ACCURACY FOR 2YEARS
+200 mV 100 MV
±2V 1mV
±20V 10 mV .. +(0.1% of reading +1digit)
±200V 100 mV
±1 ooov IV
Response Time Less than 1sec.
Overvoltage Protection 1000V dc or peak ac on all ranges, except
200 mv (15 sec max above 300V dc or rms)
Input impedance 10 MO, all ranges
Normal Mode Rejection Ratio >-60 dB at 50 Hz and 60 Hz
Common Mode Rejection
Ratio (1 kO unbalance) >100 dB at dc, 50Hz and 60 Hz
1-2 1-3

8024B
Table 1-2. 8024B Specifications (cont)
AC VOLTS {Average Sensing, RMS Calibrated Sinewave):
RANGE RESOLUTION
200 mV 100 MV
2V1mV
20V 10 mV
200V 0.1V
750V IV
ACCURACY
45 Hz to 1kHz 1kHz to 2kHz 2kHz to 5kHz
±(0.75%
of reading
+2 digits)
±{1.5% of
reading +3
digits)
+(5% of
reading
+5 digits)
Not
Specified
+{1%of '
reading +2
digits)
No?
Specified
Response Time Less than 2seconds
Overload Protection 750V rms or 1000V peak continuous, except
200 mV ac ranges {15 seconds maximum
above 300V rms).
Common Mode Rejection
Ratio {1 kSl unbalance) >60 dB at 50 Hz and 60 Hz
Volt-Hz Product 107max (200V at 50 kHz)
Input Impedance 10 M£2 in parallel with <100 pF
DC CURRENT
RANGE RESOLUTION ACCURACY
FOR 2YEARS BURDEN
VOLTAGE
2mA 1MA
+(0.75% of
reading +1
digit)
0.3V max
IIP 10 fi A
M100 /U A
2000 mA 1mA 0.9V max
Response Time Less than.-l second
Overload Protection 2A/250V fuse in series with 3A/600V fuse.
Response Time Less than.-l second
Overload Protection 2A/250V fuse in series with 3A/600V fuse.
1-4
8024B
Table 1-2. 8024B Specifications (cont)
AC CURRENT
RANGE RESOLUTION
ACCURACY for 2Years BURDEN
VOLTAGE
45 Hz to
450 Hz 450 Hz to
1kHz
2mA 1jXA ±(3% of
reading
±2 digits)
Not
Specified
0.3V rms
20 mA 10 JUA.
+(1.5% of reading +2 ,
digits)
200 mA 100 flA 0.9V rms
max
2000 mA 1mA
Response Time Less than 2seconds
Overload Protection 2A/250V fuse in series with 3A/600V fuse.
Response Time Less than 2seconds
Overload Protection 2A/250V fuse in series with 3A/600V fuse.
RESISTANCERESISTANCE
RANGE RESOLUTION ACCURACY
FOR 2YEARS FULL-SCALE
VOLTAGE
MAXIMUM
TEST
CURRENT
200£2 o.i£2 ±(0.2% Of
reading +3 digits) <0.25V .35 mA
2k!2-H- i£2 ±(0.1% of 1.1 mA
20 k£2 io£2 reading +1
digit) 13 jUA
200 k£2 ioo£2 13 /lA
2000 k£2 1k£2 0.13 /i A
20 M£2 io k£2 +(2% of
reading +1 digit) >.7V 0.13 ft A
Overload Protection 500V dc/ac rms on all ranges (15 sec max
above 300V dc or rms ac)
Overload Protection 500V dc/ac rms on all ranges (15 sec max
above 300V dc or rms ac)
Open Circuit Voltage Less than ,1.5V on ail ranges except 2k£2
range is less than 3.5V.
Diode Test The three ranges—2k£2, 200 k£2, 20 Mo-
have endugh open circuit voltage to turn on
silicon junctions allowing adiode test. The
2kO range is preferred and is marked with a
diode symbol. The three non-diode test
ranges —200 £2, 20 k£2, and 2000 k£2 ••-•-will
not turn on silicon junctions when making
in-circuit resistance measurements.
T-5

8024B
Table 1-2. 8024B Specifications (cont)
CONDUCTANCE*
Range 200 nS
Equivalent Resistance
Range 5MOto 10,000
Accuracy +(2.0% of reading +10 digits)
Resolution... 0.05% of range (1 0‘10 S)
Overload Protection 500V dc/rms ac (1 5sec max above 300V dc
or rms ac)
Diode Test Will forward bias a typical PN junction
'Conductance is the inverse of ohms (I/O) and is expressed in siemens (S).
Adecrease in conductance is equivalent to an increase in resistance.
PEAK HOLD Use for Measuring Transient Signals
FUNCTIONS, RANGES AC or DC, VOLTS or CURRENT
ALL RANGES
AC
Accuracy
(48 —450 Hz)
3% of reading +10 digits, all ranges
(except 2mA, 6% of reading +10 digits).
Average sensing, calibrated to read
highest rms value of sine wave.
Acquisition Time 150 ms"
DC
Accuracy 3% of reading +10 digits, positive pulses
Acquisition Time 10 ms** square pulse
(3 ms square or 8ms half sine typ.)
Display Decay Rate <1 digit/sec
"Acquisition Time is the minimum duration of peak or surge for rated
accuracy.
Accuracy improves for longer peak duration.
TEMPERATURE (Thermocouple accessory required)
Temperature Sensor K-Tvpe Thermocouple (Chromel-Alume!)
See accessories
Range -20° Cto +1265° C
Resolution
1-6
8024B
Table 1-2. 8024B Specifications (cont)
Accuracy
±3° C±1 digit, -20° to +300° C
3% of reading, +300° Cto +1265°C
(Accuracy includes NBS conformity,
calibration stability, zero, and reference
junction but not thermocouple errors.)
Connection
Dual banana isothermal termination pro-
vided with FLUKE thermocouple acces-
sories. Use Y8104 termination accessory
for any K-Type thermocouple.
Overload Protection 2A/250V fuse in series with 3A/600V fuse.
CONTINUITY Use for Passive Circuit Testing*
Ranges All Resistance and Conductance ranges
indication
Open Circuit: "A”Display
Continuity: “T”Display +2kHz audio
tone (selectable)
Response Time
(2 k£2 range)
50 fiS (Minimum duration of continuity
or open to toggle display or audio tone.
Pulse stretcher holds display and tone
for approx. 100 ms.)
Overload Protection 500V dc or rms ac all ranges (15 sec max
above 300V dc or rms ac)
'See section 2for additional information.
LEVEL DETECTOR Use for Active Circuit Testing
Reference Level
Display
+0.8V dc nominal on 200 kS2 range
•• A”for inputs greater than reference
“T”for inputs less than reference
“A•• for inputs toggling above and
below reference
Audio tone coincident with “W
(switch selectable)

8024B
Pulse Response
{200 k£2 range)
Input Impedance
Overload Protection
ENVIRONMENTAL
Table 1-2, 8024B Specifications (cont)
50 ftS {Minimum width of 0to +3V
pulse required to toggle display. Pulse
stretcher holds display for approx. 100
ms when short pulses are detected.)
>100 k£2 in parallel with <100 pF
500V dc or rms ac (15 sec max above 300V
dc or rms ac) ___
Temperature
OPERATING 0° Cto 50° C(32° Fto 122° F)
STORAGE -35 to +60° C
Relative Humidity 0to 90% from 0° Cto 35° Cexcept 0to 80%
from 0° Cto 35° Con 2MS2; 20M11, and
200 nS ranges; 0to 70% from 35° Cto
50° C
Temperature
Coefficient ’<0.1 times the applicable accuracy speci-
fication per °Cfor 0° Cto 18° Cand 28°Cto
50° C(32° Fto 64.4° Fand 82.4° Fto 122° F),
except temperature {<0.02 Xaccuracy,
per °C)
GENERAL:
Protection Class 2 (Relates solely to insulation or grounding
properties defined in IEC 348)
Maximum Common Mode
Voltage 500V dc or rms
Power Requirements Single 9V battery, NEDA 1604
BATTERY LIFE Alkaline: 100 hours typical
Zinc carbon: 50 hours typical
BATTERY INDICATOR ... “BT” in display illuminates when approxi-
mately 20% of life remains
Display 372 digit LCD (1 ,999 count), autozero, auto-
polarity
LxWxH: 18.0 cm x8.6 cm x4,5 cm
(7.1 in x3.4 in x1.8 in) !
Weight 48 Kg, (17 oz)
8024B
2-1. INTRODUCTION
2-2. Tofully utilize the measurement capabilities of your 8024B, abasic understanding of
its measurement techniques and limitations is required. This section of the manual
provides that information.
2-3. PREPARING FOR OPERATION
2-4. Unpacking
2-5,Your 8024B, this manual, one 9V battery, and two test leads (one red and one black)
were shipped to you in aspecially designed container. Check the shipment carefully and
contact the place of purchase immediately if anything is wrong. If the place of purchase
fails to satisfy you, contact the nearest John Fluke Service Center. Alist of these service
centers is located at the end of this manual.
2-6. If reshipment is necessary, please use the original shipping container. If the original
container is not available, anew one can be obtained from the John Fluke Mfg. Co., Inc.
Please state the instrument model number when requesting anew shipping container.
2-7. Battery or Fuse Installation/Replacement
2-8. Your 8024B is designed to operate on asingle, inexpensive, 9V battery of the
transistor radio/ calculator variety (NEDA 1604). When you receive your 8024B, the
battery will not be installed in the DMM. Once the battery is installed, you can expect a
typical operating life of up to 100 hours with an alkaline battery or 50 hours with acarbon-
zinc battery. Wrhen the battery has exhausted about 80% of its useful life the BT indicator
will appear in the upper left corner of the display. Your 8024B will operate properly for at
least 10 hours on an alkaline battery after BT appears in the display. Use the following
procedure to install or replace the battery or fuse:
CAUTION
To ensure operation within the accuracy specifications, the battery should be
replaced when the voltage measured at the center of the battery eliminator
connector falls below -3.00 volts (with respect to the COMMON input). If the
2-1

8024B 8024B
battery voltage falls to apoint where the ‘BT1is displayed and the digital display
is inactive or no longer responds to asignal input, the battery should be
replaced immediately to prevent damage to the LCD.
WARNING
TO AVOID ELECTRICAL SHOCK, BATTERY OR FUSE REPLACEMENT
SHOULD ONLY BE PERFORMED AFTER THE INPUT SIGNAL AND TEST
LEADS HAVE BEEN REMOVED FROM THE INPUT TERMINALS AND THE
POWER SWITCH HAS BEEN SET TO OFF.
1.Set the 8024 BPOWER switch to OFF.
2. Remove test leads from external circuit connections and from the 8024B input
terminals.
3. Open the batten' compartment on the bottom of the 8024B as shown in
Figure 2-1.
Figure 2-1. Removing the Battery Cover
4. Tilt the battery out as shown in Figure 2-2.
5. If fuse FI is to be replaced, use apointed tool, such as aprobe tip or small
screwdriver to pry FI from its holder. Replace the defective fuse with type AGX2.
(Instruments that accommodate metric fuses use type 171100-2.)
6. Carefully pull the battery clip free from the battery terminals as shown in
Figure 2-2.
7. Press the battery clip onto the replacement battery and return both to the
battery compartment.
8. Make sure the battery leads are routed to the side of the battery and are
completely within the confines of the battery compartment before sliding the cover
into place.
WARNING
DO NOT OPERATE THE 8024B UNTIL THE BATTERY COVER IS IN PLACE
AND FULLY CLOSED.
LI
Figure 2-2. Battery Removal
2-9. PHYSICAL FEATURES
2-10. Before you try to use your 8024B, we suggest you take afew minutes to get
acquainted with your instrument. All of the externally accessible physical features of your
8024B are shown in Figure 2-3 and described in Table 2-1. Locate each feature on your
8024B as you read the description.
2-2 2-3