Owner's Manual
True RMS
Multimeter
Model No.
82003
CAUTION: Read, understand and
follow Safety Rules and Operating
Instructions in this manual before
using this product.
 Safety
 Operation
 Maintenance
 Español
© Sears, Roebuck and Co., Hoffman Estates, IL 60179 U.S.A.
www.craftsman.com
042508
TABLE OF CONTENTS
Warranty
Safety Instructions
Safety Symbols
Control and Jacks
Symbols and Annunciators
Specifications
Battery Installation
Operating Instructions
DC Voltage Measurements
AC Voltage Measurements
DC Current Measurements
AC Current Measurements
Resistance Measurements
Continuity Check
Diode Test
Capacitance Measurements
Frequency (Duty Cycle) Measurements
Temperature Measurements
Autoranging/Manual range selection
Relative Mode
Display Backlight
Hold
Auto Power Off
Low Battery Indication
Maintenance
Battery Replacement
Fuse Replacement
Troubleshooting
Service and Parts
2
Page 3
4
5
6
6
7
11
12
12
13
14
15
16
17
17
18
18
19
20
20
21
21
21
21
22
23
24
25
25
ONE YEAR FULL WARRANTY
CRAFTSMAN PROFESSIONAL ONE YEAR FULL
WARRANTY. If this product fails due to a defect in materials or
workmanship within one year from the date of purchase,
RETURN IT TO ANY SEARS STORE OR OTHER
CRAFTSMAN OUTLET IN THE UNITED STATES for free
replacement. This warranty gives you specific legal rights, and
you may also have other rights which vary from state to state.
Sears, Roebuck and Co., Hoffman Estates, IL 60179
For Customer Assistance Call 9am - 5pm (ET)
Monday through Friday 1-888-326-1006
WARNING: USE EXTREME CAUTION IN THE USE OF THIS
DEVICE. Improper use of this device can result in injury or
death. Follow all safeguards suggested in this manual in addition
to the normal safety precautions used in working with electrical
circuits. DO NOT service this device if you are not qualified to do
so.
3
SAFETY INSTRUCTIONS
This meter has been designed for safe use, but must be operated
with caution. The rules listed below must be carefully followed for
safe operation.
1.
NEVER apply voltage or current to the meter that exceeds the
specified maximum:
Input Limits
Function
V DC or V AC
mA AC/DC
A AC/DC
Maximum Input
1000VDC/AC rms
400mA AC/DC
10A AC/DC (20A for 30 seconds
max every 15 minutes)
Resistance, Diode Test,
Continuity, Capacitance,
Frequency, Temperature
1000VDC/AC rms
2.
USE EXTREME CAUTION when working with high voltages
3.
DO NOT measure voltage if the voltage on the "COM" input
jack exceeds 1000V above earth ground
4.
DO NOT measure current of circuits whose voltage is greater
than 600V above earth ground
5.
NEVER connect the meter leads across a voltage source
while the function switch is in the resistance or diode mode.
Doing so can damage the meter
ALWAYS turn off the power and disconnect the test leads
before opening the cover to replace the fuse or battery
6.
7.
NEVER operate the meter unless the back cover is in place
and fastened securely
4
SAFETY SYMBOLS
This symbol adjacent to another symbol,
terminal or operating device indicates that the
operator must refer to an explanation in the
Operating Instructions to avoid personal injury
or damage to the meter.
WARNING
This WARNING symbol indicates a potentially
hazardous situation, which if not avoided,
could result in death or serious injury.
CAUTION
This CAUTION symbol indicates a potentially
hazardous situation, which if not avoided, may
result damage to the product.
MAX
1000V
This symbol advises the user that the
terminal(s) so marked must not be connected
to a circuit point at which the voltage with
respect to earth ground exceeds (in this case)
1000 VAC or VDC.
This symbol adjacent to one or more terminals
identifies them as being associated with
ranges that may, in normal use, be subjected
to particularly hazardous voltages. For
maximum safety, the meter and its test leads
should not be handled when these terminals
are energized.
This symbol indicates that a device is
protected throughout by double insulation or
reinforced insulation.
5
CONTROLS AND JACKS
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
4,000 count LCD display
RANGE button
Hz and % button
Mode button
Function switch
mA, µA and 10A input jacks
COM input jack
Positive input jack
Backlight button
REL button
HOLD button
Note: Tilt stand and battery compartment are on rear of unit.
SYMBOLS AND ANNUNCIATORS
•)))
n
µ
m
A
k
F
M

Hz
%
AC
DC
ºF
Continuity
Diode test
Battery status
-9
nano (10 ) (capacitance)
-6
micro (10 ) (amps)
-3
milli (10 ) (volts, amps)
Amps
3
kilo (10 ) (ohms)
Farads (capacitance)
6
mega (10 ) (ohms)
Ohms
Hertz (frequency)
Percent (duty ratio)
Alternating current
Direct current
Degrees Fahrenheit
6
V
REL
Auto
HOLD
ºC
Volts
Relative
Autoranging
Display hold
Degrees Centigrade
SPECIFICATIONS
Function
Range
DC Voltage 400mV
Resolution
0.1mV
4V
40V
400V
1000V
0.001V
0.01V
0.1V
1V
AC Voltage 400mV
0.1mV
4V
40V
400V
1000V
0.001V
0.01V
0.1V
1V
DC Current 400A
4000A
40mA
400mA
10A
AC Current 400A
4000A
40mA
400mA
10A
Accuracy
(0.5% reading + 2 digits)
(1.2% reading + 2 digits)
(1.5% reading + 2 digits)
(2.0% reading + 10 digits)
(2.0% reading + 5 digits)
(2.5% reading + 5 digits)
(1.0% reading + 3 digits)
0.1A
1A
0.01mA
0.1mA
0.01A
(1.5% reading + 3 digits)
(2.5% reading + 5 digits)
(2.5% reading + 10 digits)
0.1A
1A
0.01mA
0.1mA
0.01A
(2.5% reading + 5 digits)
(3.0% reading + 7 digits)
0.1
(1.2% reading + 4 digits)
4k
0.001k
(1.0% reading + 2 digits)
40k
0.01k
400k
0.1k
4M
0.001M
40M
0.01M
Resistance 400
(1.2% reading + 2 digits)
7
(2.0% reading + 3 digits)
Function
Range
Capacitance 40nF
400nF
Frequency
Duty Cycle
Temp
(type-K)
Resolution
0.01nF
Accuracy
(5.0% reading + 7 digits)
0.1nF
4F
0.001F
40F
0.01F
(3.0% reading + 5 digits)
100F
0.1F
5.999Hz 0.001Hz
59.99Hz 0.01Hz
599.9Hz 0.1Hz
5.999kHz 0.001kHz
59.99kHz 0.01kHz
599.9kHz 0.1kHz
5.999MHz 0.001MHz
9.999MHz 0.001MHz
Sensitivity: 0.5V rms <500kHz;
0.1 to 99.9%
0.1%
(5% reading + 5 digits)
(1.5% reading + 1 digits)
(1.2% reading + 3 digits)
(1.5% reading + 4 digits)
3V rms >500kHz
(1.2% reading + 2 digits)
Pulse width: 100µs - 100ms, Frequency: 5Hz to 150kHz
-4 to 1382F 0.1<400 (3.0% reading + 5C /9F )
(probe accuracy not included)
-20 to 750C 1 ≥ 400
Supplied Probe range: -58.0 to 482oF (-50.0 to 250oC)
Note: An optional probe that is rated to the full range of the meter
is available from the www.craftsman.com website.
o
o
o
o
Note: Accuracy is stated at 65 F to 83 F (18 C to 28 C) and less
than 75% RH.
Note: Accuracy specifications consist of two elements:
 (% reading) – This is the accuracy of the measurement circuit.
 (+ digits) – This is the accuracy of the analog to digital converter.
8
Enclosure
Shock (Drop Test)
Diode Test
Double molded, waterproof (IP67)
6.5 feet (2 meters)
Test current of 0.3mA typical, open
circuit voltage 1.5V DC typical
Continuity Check
Audible signal will sound if the
resistance is less than 100 (approx.),
test current <0.3mA
Temperature Sensor
Requires type K thermocouple
Input Impedance
7.8MΩ
AC Response
True rms
ACV Bandwidth
50Hz to 400Hz
Crest Factor
≤3 at full scale up to 500V, decreasing
linearly to ≤1.5 at 1000V
Display
4,000 count backlit liquid crystal
Overrange indication
“OL” is displayed
Auto Power Off
30 minutes (approximately)
Polarity
Automatic (no indication for positive);
Minus (-) sign for negative
Measurement Rate
2 times per second, nominal
Low Battery Indication “ ” is displayed if battery voltage
drops below operating voltage
Battery
One 9 volt (NEDA 1604) battery
Fuses
mA, µA ranges; 0.5A/1000V ceramic
fast blow
A range; 10A/1000V ceramic fast blow
Operating Temperature 41F to 104F (5C to 40C)
Storage Temperature
-4F to 140F (-20C to 60C)
Operating Humidity
Max 80% up to 87F (31C) decreasing
linearly to 50% at 104F (40C)
Storage Humidity
<80%
Operating Altitude
7000ft. (2000meters) maximum.
Weight
0.908lb (412g) (includes holster).
Size
7.2” x 3.2” x 2.2” (182 x 82 x 55mm)
9
Safety
Approvals
UL Listed
This meter is intended for origin of installation use
and protected, against the users, by double
nd
insulation per EN61010-1 and IEC61010-1 2
Edition (2001) to Category IV 600V and Category III
1000V; Pollution Degree 2. The meter also meets
nd
UL 61010-1, 2 Edition (2004), CAN/CSA C22.2
nd
No. 61010-1 2 Edition (2004), and UL 61010B-2st
031, 1 Edition (2003)
UL CE
The UL mark does not indicate that this product has
been evaluated for the accuracy of its readings.
10
BATTERY INSTALLATION
WARNING: To avoid electric shock, disconnect the test leads
from any source of voltage before removing the battery cover.
1. Turn power off and disconnect the test leads from the meter.
2. Open the rear battery cover by removing two screws (B) using
a Phillips head screwdriver.
3. Insert the battery into battery holder, observing the correct
polarity.
4. Put the battery cover back in place. Secure with the screws.
WARNING: To avoid electric shock, do not operate the meter
until the battery cover is in place and fastened securely.
NOTE: If your meter does not work properly, check the fuses and
batteries to make sure that they are still good and that they
are properly inserted.
A
B
A
B
F1 F2
11
A
OPERATING INSTRUCTIONS
WARNING: Risk of electrocution. High-voltage circuits, both AC
and DC, are very dangerous and should be measured with great
care.
1. ALWAYS turn the function switch to the OFF position when the
meter is not in use.
2. If “OL” appears in the display during a measurement, the value
exceeds the range you have selected. Change to a higher range.
NOTE: On some low AC and DC voltage ranges, with the test
leads not connected to a device, the display may show a
random, changing reading. This is normal and is caused by
the high-input sensitivity. The reading will stabilize and give
a proper measurement when connected to a circuit.
DC VOLTAGE MEASUREMENTS
CAUTION: Do not measure DC voltages if a motor on the
circuit is being switched ON or OFF. Large voltage surges may
occur that can damage the meter.
1. Set the function switch to the V position.
2. Press the MODE button to select DC (if
necessary).
3. Insert the black test lead banana plug into
the negative COM jack.
Insert the red test lead banana plug into the
positive V jack.
4. Touch the black test probe tip to the negative
side of the circuit.
Touch the red test probe tip to the positive
side of the circuit.
5. Read the voltage in the display.
12
AC VOLTAGE (Frequency, Duty Cycle) MEASUREMENTS
AC VOLTAGE: The probe tips may not be long enough to
contact the live parts inside some 240V outlets for appliances
because the contacts are recessed deep in the outlets. As a
result, the reading may show 0 volts when the outlet actually
has voltage on it.
WARNING: To avoid electric shock, make sure the probe tips
are touching the metal contacts inside the outlet before
assuming no voltage is present
CAUTION: Do not measure AC voltages if a motor on the
circuit is being switched ON or OFF. Large voltage surges may
occur that can damage the meter.
1. Set the function switch to the V position.
2. Press the MODE button to select AC (if
necessary)
3. Insert the black test lead banana plug into
the negative COM jack.
Insert red test lead banana plug into the
positive V jack.
4. Touch the black test probe tip to the neutral
side of the circuit.
Touch the red test probe tip to the “hot” side
of the circuit.
5. Read the voltage in the display.
6. Press the HZ/% button to indicate “Hz”.
7. Read the frequency in the display.
8. Press the Hz/% button again to indicate “%”.
9. Read the % of duty cycle in the display.
13
DC CURRENT MEASUREMENTS
CAUTION: Do not make current measurements on the 20A
scale for longer than 30 seconds. Exceeding 30 seconds may
cause damage to the meter and/or the test leads.
1. Insert the black test lead banana plug into
the negative COM jack.
2. For current measurements up to 4000µA DC,
set the function switch to the µA position
and insert the red test lead banana plug into
the µA/mA jack.
3. For current measurements up to 400mA DC,
set the function switch to the mA position
and insert the red test lead banana plug into
the µA/mA jack.
4. For current measurements up to 10A DC,
set the function switch to the 10A position
and insert the red test lead banana plug into
the 10A jack.
5. Press the MODE button to indicate “DC” on
the display.
6. Remove power from the circuit under test, then open up the
circuit at the point where you wish to measure current.
7. Touch the black test probe tip to the negative side of the
circuit.
Touch the red test probe tip to the positive side of the circuit.
8. Apply power to the circuit.
9. Read the current in the display.
14
AC CURRENT (Frequency, Duty Cycle) MEASUREMENTS
CAUTION: Do not make current measurements on the 20A
scale for longer than 30 seconds. Exceeding 30 seconds may
cause damage to the meter and/or the test leads.
1. Insert the black test lead banana plug into
the negative COM jack.
2. For current measurements up to 4000µA
AC, set the function switch to the µA
position and insert the red test lead
banana plug into the µA/mA jack.
3. For current measurements up to 400mA
AC, set the function switch to the mA
position and insert the red test lead
banana plug into the µA/mA jack.
4. For current measurements up to 10A AC,
set the function switch to the 10A position
and insert the red test lead banana plug
into the 10A jack.
5. Press the MODE button to indicate “AC”
on the display.
6. Remove power from the circuit under test, then open up the
circuit at the point where you wish to measure current.
7. Touch the black test probe tip to the neutral side of the circuit.
Touch the red test probe tip to the “hot” side of the circuit.
8. Apply power to the circuit.
9. Read the current in the display.
10. Press the Hz/% button to indicate “Hz”.
11. Read the frequency in the display.
12. Press the Hz/% button again to indicate “%”.
13. Read the % duty cycle in the display.
14. Press the Hz/% button to return to current measurement.
15
RESISTANCE MEASUREMENTS
WARNING: To avoid electric shock, disconnect power to the
unit under test and discharge all capacitors before taking any
resistance measurements. Remove the batteries and unplug
the line cords.
1. Set the function switch to the ΩCAP
position.
2. Insert the black test lead banana plug into
the negative COM jack.
Insert the red test lead banana plug into the
positive  jack.
3. Press the MODE button to indicate “"on
the display.
4. Touch the test probe tips across the circuit or
part under test. It is best to disconnect one
side of the part under test so the rest of the
circuit will not interfere with the resistance
reading.
5. Read the resistance in the display.
16
CONTINUITY CHECK
WARNING: To avoid electric shock, never measure continuity
on circuits or wires that have voltage on them.
1. Set the function switch to the Ω CAP
position.
2. Insert the black lead banana plug into the
negative COM jack.
Insert the red test lead banana plug into the
positive  jack.
3. Press the MODE button to indicate” "and
“Ω” on the display
4. Touch the test probe tips to the circuit or wire
you wish to check.
5. If the resistance is less than approximately
100, the audible signal will sound. If the
circuit is open, the display will indicate “OL”.
DIODE TEST
1. Set the function switch to the Ω CAP
position.
2. Insert the black test lead banana plug into
the negative COM jack and the red test lead
banana plug into the positive V jack.
3. Press the MODE button to indicate
and V
on the display.
4. Touch the test probes to the diode under test.
Forward voltage will typically indicate 0.400
to 0.700V. Reverse voltage will indicate “OL”.
Shorted devices will indicate near 0V and an
open device will indicate “OL” in both
polarities.
17
CAPACITANCE MEASUREMENTS
WARNING: To avoid electric shock, disconnect power to the
unit under test and discharge all capacitors before taking any
capacitance measurements. Remove the batteries and unplug
the line cords.
1. Set the rotary function switch to the Ω CAP
position.
2. Insert the black test lead banana plug into
the negative COM jack.
Insert the red test lead banana plug into the
positive V jack.
3. Press the MODE button to indicate “nF” on
the display.
4. Touch the test leads to the capacitor to be
tested.
5. The test may take up to 3 minutes or more
for large capacitors to charge. Wait until the
readings settle before ending the test.
6. Read the capacitance value in the display
FREQUENCY (Duty Cycle) MEASUREMENTS (Electronic)
1. Set the rotary function switch to the “Hz %”
position.
2. Press the Hz/% button to indicate “Hz” in the
display.
3. Insert the black lead banana plug into the
negative COM jack and the red test lead
banana plug into the positive Hz jack.
4. Touch the test probe tips to the circuit under
test.
5. Read the frequency on the display.
6. Press the Hz/% button again to indicate “%”
on the display.
7. Read the % of duty cycle on the display.
18
TEMPERATURE MEASUREMENTS
1. Set the function switch to the ºF or ºC
position.
2. Insert the Temperature Probe into the
input jacks, making sure to observe
the correct polarity.
3. Touch the Temperature Probe head
to the part whose temperature you
wish to measure. Keep the probe
touching the part under test until the
reading stabilizes (about 30 seconds).
4. Read the temperature in the display.
Note: The temperature probe is fitted with a type K mini connector.
A mini connector to banana connector adaptor is supplied
for connection to the input banana jacks.
Note: The supplied thermocouple is rated for 482°F (250°C). For
higher temperatures you can purchase a high temperature
thermocouple from www.craftsman.com.
FREQUENCY SENSITIVITY (ELECTRICAL)
The frequency sensitivity is range dependent when the function
is selected from while in the voltage or current measuring
function. Below are typical sensitivities for the “electrical”
measurement modes.
Range
( DC/AC )
4V
Sensitivity
Frequency width
≥1.5V rms
5Hz~10kHz
40V, 400V
≥10V rms
5Hz~20kHz
1000V/1000V
≥20V rms
≥420V rms
5Hz~200kHz
50Hz~1kHz
400mA
≥45mA rms
5Hz~5kHz
10A
≥4A rms
5Hz~1kHz
19
AUTORANGING/MANUAL RANGE SELECTION
When the meter is first turned on, it automatically goes into
Autoranging. This automatically selects the best range for the
measurements being made and is generally the best mode for
most measurements. For measurement situations requiring that
a range be manually selected, perform the following:
1. Press the RANGE key. The “Auto” display indicator will turn
off.
2. Press the RANGE key to step through the available ranges.
Observe the decimal point and units displayed until the
preferred range is located.
3. To exit the Manual Ranging mode and return to Autoranging,
press and hold the RANGE key for 2 seconds.
Note: Manual ranging does not apply for the Capacitance and
Frequency functions.
RELATIVE MODE
The relative measurement feature allows you to make
measurements relative to a stored zero reference value. A
reference voltage, current, etc. can be stored and
measurements made in comparison to that value. The displayed
value is the difference between the reference value and the
measured value.
1. Perform the measurement as described in the operating
instructions.
2. Press the REL button to store (zero) the reading in the display
and the "REL" indicator will appear on the display.
3. The display will now indicate the difference between the
stored value and the measured value.
4. Press the REL button to exit the relative mode.
Note: The Relative function does not operate in the Frequency
function.
DISPLAY BACKLIGHT
Press the backlight
button to turn on. The light will slowly
fade to off after approxamately 10 to 15 seconds.
HOLD
The hold function freezes the reading in the display. Press the
HOLD key momentarily to activate or to exit the HOLD function.
20
AUTO POWER OFF
The auto off feature will turn the meter off after 30 minutes. To
disable the auto power off feature, hold down the MODE button
and turn the meter on.
LOW BATTERY INDICATION
The icon will appear in the display when the battery voltage
becomes low. Replace the battery when this appears.
21
MAINTENANCE
WARNING: To avoid electric shock, disconnect the test leads
from any source of voltage before removing the back cover or
the battery cover.
WARNING: To avoid electric shock, do not operate your meter
until the battery cover is in place and fastened securely.
This multimeter is designed to provide years of dependable service,
if the following care instructions are performed:
1. KEEP THE METER DRY. If it gets wet, wipe it off.
2. USE AND STORE THE METER IN NORMAL
TEMPERATURES. Temperature extremes can shorten the life
of the electronic parts and distort or melt plastic parts.
3. HANDLE THE METER GENTLY AND CAREFULLY. Dropping
it can damage the electronic parts or the case.
4. KEEP THE METER CLEAN. Wipe the case occasionally with a
damp cloth. DO NOT use chemicals, cleaning solvents, or
detergents.
5. USE ONLY FRESH BATTERIES OF THE RECOMMENDED
SIZE AND TYPE. Remove old or weak batteries so they do not
leak and damage the unit.
6. IF THE METER IS TO BE STORED FOR A LONG PERIOD
OF TIME, the batteries should be removed to prevent damage
to the unit.
UL LISTED
The UL mark does not indicate that this product has been
evaluated for the accuracy of its readings.
22
BATTERY INSTALLATION
WARNING: To avoid electric shock, disconnect the test leads
from any source of voltage before removing the battery cover.
1. Turn power off and disconnect the test leads from the meter.
2. Open the rear battery cover by removing two screws (B)
using a Phillips head screwdriver.
3. Insert the battery into battery holder, observing the correct
polarity.
4. Put the battery cover back in place. Secure with the screws.
WARNING: To avoid electric shock, do not operate the meter
until the battery cover is in place and fastened securely.
NOTE: If your meter does not work properly, check the fuses and
batteries to make sure that they are still good and that they
are properly inserted.
REPLACING THE FUSES
WARNING: To avoid electric shock, disconnect the test leads
from any source of voltage before removing the fuse cover.
1. Disconnect
A
A
B
the test
B
A
leads from
the meter.
2. Remove the
battery cover
(two “B”
screws) and
F1 F2
the battery.
3. Remove the
six “A”
screws
securing the
rear cover.
4. Gently remove the old fuse and install the new fuse into the
holder.
23
5. Always use a fuse of the proper size and value (0.5A/1000V
fast blow for the 400mA range [SIBA 70-172-40], 10A/1000V
fast blow for the 20A range [SIBA 50-199-06]).
6. Replace and secure the rear cover, battery and battery cover.
WARNING: To avoid electric shock, do not operate your meter
until the fuse cover is in place and fastened securely.
24
TROUBLESHOOTING
There may be times when your meter does not operate properly.
Here are some common problems that you may have and some
easy solutions to them.
Meter Does Not Operate:
1. Always read all the instructions in this manual before use.
2. Check to be sure the battery is properly installed.
3. Check to be sure the battery is good.
4. If the battery is good and the meter still doesn’t operate, check
to be sure that both ends of the fuse are properly installed.
If You Do Not Understand How the Meter Works:
Call our Customer Service Line 1-888-326-1006.
SERVICE AND PARTS
Item Number
Description
82378
82003-D
82003-C
82003-CS
82377
Set of black and red Test Leads
Replacement battery cover
Front cover
Rear cover screws
Thermocouple probe
For replacement parts shipped directly to your home
Call 9 am – 5 pm Eastern Time, M - F
1-888-326-1006
25