Owner’s Manual
Mini Multimeter
with Non-Contact
Voltage Detector
(NCV)
Model No.
82312
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
071006
TABLE OF CONTENTS
Warranty............................................................................................ 3
Safety Instructions ............................................................................ 4
Safety Symbols ................................................................................. 5
Controls And Jacks........................................................................... 6
Symbols ............................................................................................ 7
Specifications .................................................................................... 8
Battery Installation .......................................................................... 11
Operating Instructions .................................................................... 12
Non-Contact AC Voltage Detector ............................................. 13
AC Voltage Measurements......................................................... 14
DC Voltage Measurements......................................................... 15
Battery Voltage Test ................................................................... 16
AC / DC Current Measurements................................................. 17
Resistance Measurements ......................................................... 18
Continuity Check ......................................................................... 19
Diode Test ................................................................................... 20
Maintenance ................................................................................... 21
Low Battery Indication .................................................................... 21
Battery Replacement ...................................................................... 22
Replacing The Fuses...................................................................... 22
Troubleshooting .............................................................................. 24
Service And Parts ........................................................................... 24
2
ONE YEAR FULL WARRANTY
ONE YEAR FULL WARRANTY ON CRAFTSMAN MULTIMETER
If this CRAFTSMAN Multimeter fails to give complete satisfaction within
one year from the date of purchase, RETURN IT TO THE NEAREST
SEARS STORE OR OTHER CRAFTSMAN OUTLET IN THE UNITED
STATES, and Sears will replace it, free of charge.
This warranty gives you specific legal rights, and you may also have
other rights which vary from state to state.
Sears, Roebuck and Co., Dept. 817WA, 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 Protection Limits
Function
Maximum Input
V DC or V AC
600V AC and DC
mA AC/DC
200mA DC/AC
A AC/DC
10A DC/AC (for 30 seconds max.
every 15 minutes)
Resistance, Diode Test,
Continuity
250V DC/AC
2.
3.
4.
5.
6.
7.
8.
USE EXTREME CAUTION when working with high voltages.
DO NOT measure voltage if the voltage on the "COM" input jack exceeds
600V above earth ground.
NEVER connect the meter leads across a voltage source while the function
switch is in the current, resistance, or diode mode. Doing so can damage
the meter.
ALWAYS discharge filter capacitors in power supplies and disconnect the
power when making resistance or diode tests.
ALWAYS turn off power and disconnect test leads before opening the
covers to replace the fuse or battery.
NEVER operate the meter unless the back cover and the battery and fuse
covers are in place and fastened securely.
If the equipment is used in a manner not specified by the manufacturer, the
protection provided by the equipment may be impaired.
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
600V
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 600V.
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. AC Voltage Detector Sensor
2. AC Voltage Detector
indicator light
3. LCD display
4. Non-contact AC Voltage
Detector test button
5. Rotary function dial
6. 10 ampere test lead jack
7. COM test lead jack
8. Test lead jack for voltage,
milliamp,
resistance/continuity, and
diode functions
9. Protective rubber holster
(must be removed to access the rear battery compartment)
6
SYMBOLS
•)))
Continuity
Diode
Battery status
AC
DC
-3
m
k
V
A
!
milli (10 ) (volts, amps)
3
kilo (10 ) (ohms)
Volts
Amps
Ohms
AC
DC
Alternating current
Direct current
7
SPECIFICATIONS
Function
Range Resolution Accuracy
Non100 to Resolution & accuracy do not apply since
contact AC 600V
the meter does not display the voltage in
Voltage
this mode. The lamp at the top of the
detector
meter’s display flashes when voltage is
sensed and an audible warning will sound.
DC Voltage 200mV 0.1mV
(V DC)
!(0.5% reading + 2 digits)
2000m 1mV
V
20V
0.01V
200V
0.1V
600V
AC Voltage 200V
(VAC)
600V
50/60Hz
!(1.0% reading + 2 digits)
1V
!(1.5% reading + 2 digits)
0.1V
!(1.5% reading + 3 digits)
1V
!(2.0% reading + 4 digits
DC Current 200mA 0.1mA
!(1.5% reading + 2 digits)
(A DC)
0.01A
!(2.5% reading + 5 digits)
AC Current 200mA 0.1mA
!(1.8% reading + 5 digits)
(AAC)
50/60Hz
0.01A
!(3.0% reading + 7 digits)
0.1!
!(1.2% reading + 4 digits)
10A
10A
Resistance 200!
2000!
1!
20k!
0.01k!
200k!
0.1k!
!(1.2% reading + 2 digits)
2000k! 1k!
8
Notes:
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.
o
o
o
o
Accuracy is stated at 65 F to 83 F (18 C to 28 C) and less than
75% RH.
Diode Test
Bias voltage: 2.3VDC
Continuity Check
Audible signal will sound if the
resistance is less than 100!
Input Impedance
10M! (VDC & VAC)
AC Bandwidth
50 / 60Hz
Display
2000 count (0 to 1999) LCD
Overrange indication
“1___” is displayed
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 (1) 9V battery
Fuses
mA range; 200mA/250V fast blow
A range; 10A/250V fast blow,
ceramic
Operating Temperature
32ºF to 122ºF (0ºC to 50ºC)
o
o
o
o
Storage Temperature
-4 F to 140 F (-20 C to 60 C)
Operating Humidity
Max 70% up to 87ºF (31ºC)
decreasing linearly to 50% at 122ºF
(50ºC)
Storage Humidity
< 80% RH
Operating Altitude
7000 ft. (2000 meters) maximum.
Weight
9.17 oz (260g) includes holster
Size
5.8” x 2.9” x 1.6” (147 x 76 x 42mm)
includes holster
Approvals
CE, UL
9
Safety
UL LISTED
This meter is intended for indoor use
and protected, against the users, by
double insulation per EN61010-1
and IEC61010-1 2nd Edition (2001)
to CAT II 1000V & CAT III 600V;
Pollution Degree 2. The meter also
meets UL 61010-1, Second Edition
(2004), CAN/CSA C22.2 No. 610101, Second Edition (2004), and UL
61010B-2-031, First Edition (2003)
The UL mark does not indicate that
this product has been evaluated for
the accuracy of its readings.
PER IEC1010 OVERVOLTAGE INSTALLATION CATEGORY
OVERVOLTAGE CATEGORY I
Equipment of OVERVOLTAGE CATEGORY I is equipment for
connection to circuits in which measures are taken to limit the
transient overvoltages to an appropriate low level. Note –
Examples include protected electronic circuits.
OVERVOLTAGE CATEGORY II
Equipment of OVERVOLTAGE CATEGORY II is energyconsuming equipment to be supplied from the fixed installation.
Note – Examples include household, office, and laboratory
appliances.
OVERVOLTAGE CATEGORY III
Equipment of OVERVOLTAGE CATEGORY III is equipment in
fixed installations.
Note – Examples include switches in the fixed installation and
some equipment for industrial use with permanent connection to
the fixed installation.
OVERVOLTAGE CATEGORY IV
Equipment of OVERVOLTAGE CATEGORY IV is for use at the
origin of the installation.
Note – Examples include electricity meters and primary overcurrent protection equipment
10
BATTERY INSTALLATION
WARNING: To avoid electric shock, disconnect the test leads
from any source of voltage before removing the battery cover.
1. Disconnect the test leads from the meter.
2. Remove the rear battery cover by removing the two screws
using a Phillips head screwdriver.
3. Insert the battery into battery clips, observing the correct
polarity.
4. Put the battery cover back in place and secure with the two
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.
11
OPERATING INSTRUCTIONS
WARNING: Risk of electrocution. High-voltage circuits, both AC
and DC, are very dangerous and should be measured with great
care.
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.
12
NON-CONTACT AC VOLTAGE DETECTOR
The EX310 can detect the presence of AC voltage (from 100 to
600VAC) simply by being held very near to a voltage source.
WARNING: Test the AC voltage detector on a known live circuit
before each use.
WARNING: Before using the meter in the AC Voltage Detector
mode, verify that the battery is fresh by confirming characters
appear on the LCD when the function dial is turned to any
position. Do not attempt to use the meter as an AC Voltage
Detector if the battery is weak or bad.
NON-CONTACT VOLTAGE (NCV)
The NCV function works on any rotary
switch position.
1. Test the detector on a known live circuit
before use.
2. Press and hold the NCV button for the
duration of the test. The meter will beep
once when the button is pushed.
3. Hold the top of the meter very close to
the voltage source as shown.
4. If voltage is present, the rim of the LCD
display will flash a bright orange and an
audible warning will sound.
13
AC VOLTAGE MEASUREMENTS
WARNING: Risk of Electrocution. 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. Make sure the probe tips are
touching the metal contacts inside the outlet before assuming
that 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.
2.
3.
4.
5.
Set the function switch to
the 600 VAC position.
Insert the black test lead
banana plug into the
negative COM jack. Insert
red test lead banana plug
into the positive V jack.
Touch the black test probe
tip to the neutral side of the
circuit.
Touch the red test probe tip
to the “hot” side of circuit.
Read the voltage in the
display.
14
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.
2.
3.
4.
Set the function switch to the
highest VDC position.
Insert the black test lead
banana plug into the negative
COM jack.
Insert the red test lead
banana plug into the positive
V jack.
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.
Read the voltage in the
display. Move the function
switch to successively lower
VDC positions to obtain a
higher resolution reading.
15
BATTERY VOLTAGE TEST
CAUTION: Do not measure batteries while they are installed
in the devices they are powering. The batteries must be
removed from installations before tests can be made.
1.
2.
3.
4.
Set the function switch to the
1.5V or 9V BAT switch position.
Use the 1.5V position for ‘AAA’,
‘AA’, ‘C’, ‘D’, and other 1.5V
batteries. Use the 9V position
for square 9V transistor
batteries.
Insert the black test lead
banana plug into the negative
COM jack.
Insert the red test lead banana
plug into the positive V jack.
Touch the black test probe tip
to the negative side of the
battery. Touch the red test
probe tip to the positive side of
the battery.
Read the voltage in the display.
16
AC / DC CURRENT MEASUREMENTS
CAUTION: Do not make current measurements at 10 Amps
for longer than 30 seconds. Exceeding 30 seconds may cause
damage to the meter and/or the test leads.
1.
2.
3.
4.
5.
6.
7.
Insert the black test lead banana plug into the negative COM
jack.
For current measurements up to 200mA AC or DC, set the
function switch to the 200m AAC or ADC position and insert
the red test lead banana plug into the mA jack.
For current measurements up to 10A AC or DC, set the
function switch to the 10A AAC or 10A ADC position and
insert the red test lead banana plug into the 10A jack.
Remove power from the circuit under test, then open up the
circuit at the point where you wish to measure current.
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.
Apply power to the circuit.
Read the current in the display.
17
RESISTANCE MEASUREMENTS
WARNING: To avoid electric shock, disconnect power to the
unit under test and discharge all capacitors before taking any
resistance measurements.
1.
Set the function switch to
the highest !! 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.
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.
Read the resistance in the
display. Move the function
switch to successively
lower ! positions to obtain a higher resolution reading.
3.
4.
5.
18
CONTINUITY CHECK
WARNING: To avoid electric shock, never measure continuity
on circuits that have a voltage potential.
1.
2.
3.
4.
5.
Set the function switch
to the
position.
Insert the black lead
banana plug into the
negative COM jack.
Insert the red test lead
banana plug into the
positive ! jack.
Touch the test probe
tips to the circuit or
wire you wish to check.
If the resistance is less
than approximately
100!, the audible
signal will sound. If the
circuit is open, the
display will indicate
“1___”.
19
DIODE TEST
1.
2.
3.
4.
5.
Set the function switch to the
position.
Insert the black test lead
banana plug into the negative
COM jack and the red test
lead banana plug into the
positive
jack.
Touch the test probes to the
diode under test.
A good diode will indicate
approx. 700 ohms for the
forward test and “1___” for the
reverse test.
A shorted diode will indicate
the same value of resistance
in both the reverse and
forward test directions. An
open diode will indicate “1___”
in both test directions.
20
MAINTENANCE
WARNING: To avoid electric shock, disconnect the test leads
from any source of voltage before removing the back cover or
the battery or fuse covers.
WARNING: To avoid electric shock, do not operate your meter
until the battery and fuse covers are in place and fastened
securely.
This MultiMeter is designed to provide years of dependable service,
if the following care instructions are performed:
1.
2.
3.
4.
5.
6.
KEEP THE METER DRY. If it gets wet, wipe it off.
USE AND STORE THE METER IN NORMAL
TEMPERATURES. Temperature extremes can shorten
the life of the electronic parts and distort or melt plastic
parts.
HANDLE THE METER GENTLY AND CAREFULLY.
Dropping it can damage the electronic parts or the case.
KEEP THE METER CLEAN. Wipe the case occasionally
with a damp cloth. DO NOT use chemicals, cleaning
solvents, or detergents.
USE ONLY FRESH BATTERIES OF THE
RECOMMENDED SIZE AND TYPE. Remove old or
weak batteries so they do not leak and damage the unit.
IF THE METER IS TO BE STORED FOR A LONG
PERIOD OF TIME, the battery should be removed to
prevent damage to the unit.
LOW BATTERY INDICATION
WARNING: To avoid electric shock, disconnect the test leads from
any source of voltage before removing the battery cover. Do not
operate meter unless the battery is in place.
LOW BATTERY INDICATION
The
icon will appear in the lower left-hand corner of the
display when the battery voltage becomes low. Replace the
batteries when this appears.
21
BATTERY REPLACEMENT
1. Disconnect the test leads from the meter.
2. Remove the protective rubber holster. See diagram.
3. Remove the Phillips head screw located on the lower
back of the instrument.
4. Remove the fuse/battery compartment cover to access
the battery. See diagram.
5. Replace the 9V battery observing polarity.
6. Secure the fuse/battery compartment cover using the
Phillips head screw.
7. Place the protective rubber holster on the meter.
2
1
5
3
4
6
1. Removable Rubber Holster
2. Meter
3. Battery
4. Fuses
5. Compartment Cover
6. Rubber Holster
22
REPLACING THE FUSES
WARNING: To avoid electric shock, disconnect the test leads
from any source of voltage before removing the fuse cover.
1.
Disconnect the test leads from the meter.
2.
Remove the protective rubber holster.
3.
Remove the Phillips head screw located on the lower
back of the instrument.
4.
Remove the fuse/battery compartment cover to access
the fuses.
5.
Gently remove the fuse(s) and install new fuse(s) into
the holder(s).
6.
Always use fuses of the proper size and value
(200mA/250V fast blow for the mA / !A ranges,
10A/250V fast blow for the A range).
7.
Secure the fuse/battery compartment cover.
8.
Place the protective rubber holster on the meter.
2
1
5
3
4
6
WARNING: To avoid electric shock, do not operate your meter
until the fuse cover is in place and fastened securely.
23
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:
1. Purchase “Multitesters and Their Use for Electrical Testing”,
(Item No. 82303).
2. Call our Customer Service Line 1-888-326-1006.
SERVICE AND PARTS
Item Number
Description
82374
93894
82312-L
82312-D
82312-C
82312-CS
82394
Fuse kit
9V battery
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
24