Craftsman Thermometer 81079 User Manual

Owner's Manual  
True RMS Multimeter  
with IR Thermometer  
Model No.  
81079  
Safety  
CAUTION: Read, understand and  
follow Safety Rules and Operating  
Instructions in this manual before  
using this product.  
Operation  
Maintenance  
Español  
© Sears, Roebuck and Co., Hoffman Estates, IL 60179 U.S.A.  
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ONE YEAR FULL WARRANTY  
ONE YEAR FULL WARRANTY ON CRAFTSMAN PROFESSIONAL  
TRUE RMS MULTIMETER  
If this CRAFTSMAN Professional True RMS 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.  
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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  
Maximum Input  
600V DC/AC, 200Vrms on 400mV  
range  
mA AC/DC  
A AC/DC  
500mA 250V fast acting fuse  
20A 250V fast acting fuse(30  
seconds max every 15 minutes)  
250Vrms for 15sec max  
Frequency, Resistance,  
Capacitance, Duty Cycle,  
Diode Test, Continuity  
Temperature  
60V DC/24V AC  
2. USE EXTREME CAUTION when working with high voltages  
3. DO NOT measure voltage if the voltage on the "COM" input  
jack exceeds 600V above earth ground  
4. DO NOT measure current of circuits whose voltage is greater  
than 500V 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  
6. ALWAYS turn off the power and disconnect the test leads  
before opening the cover to replace the fuse or battery  
7. NEVER operate the meter unless the back cover is in place  
and fastened securely  
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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.  
This WARNING symbol indicates a potentially  
hazardous situation, which if not avoided,  
could result in death or serious injury.  
WARNING  
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 (in this case)  
600 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.  
This symbol indicates there is a potential  
hazard from a laser light source.  
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CONTROLS AND JACKS  
1. IR Thermometer and laser pointer  
2. 4000 count LCD display  
3. HOLD and Backlite button  
4. SELECT button  
5. Function switch  
6. mA, uA and A input jacks  
7. COM input jack  
8. Positive input jack  
9. RANGE hold button  
10. RELATIVE button  
11. Laser pointer button  
Note: Tilt stand and battery compartment are on rear of unit.  
SYMBOLS AND ANNUNCIATORS  
•)))  
Continuity  
Diode test  
Laser pointer  
Battery status  
Test lead connection  
error  
n
nano (10-9)  
(capacitance)  
!
m
k
micro (10-6) (amps, cap)  
milli (10-3) (volts, amps)  
kilo (103) (ohms)  
A
F
Amps  
Farads (capacitance)  
M
mega (106) (ohms)  
!
Ohms  
Volts  
Hz  
%
AC  
DC  
ºF  
Hertz (frequency)  
Percent (duty ratio)  
Alternating current  
Direct current  
V
REL Relative  
AUTO Autoranging  
HOLD Data hold  
Degrees Fahrenheit  
ºC  
Degrees Centigrade  
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SPECIFICATIONS  
Function Range  
Resolution  
Accuracy  
DC  
400mV 0.1mV  
±(0.3% reading + 2 digits)  
Voltage  
4V  
0.001V  
0.01V  
0.1V  
1V  
±(0.5% reading + 2 digits)  
40V  
400V  
600V  
±(0.8% reading + 3 digits)  
AC  
Voltage  
50 to 400Hz 400Hz to 1kHz  
±(1.5% reading ±(2.5% reading  
400mV 0.1mV  
+ 15 digits)  
+ 15digits)  
4V  
0.001V  
0.01V  
0.1V  
1V  
±(1.5% reading ±(2.5% reading  
+ 6 digits) + 8 digits)  
40V  
400V  
600V  
±(1.8% reading ±(3% reading +  
+ 6 digits) 8 digits)  
DC  
400µA  
0.1µA  
Current  
4000µA 1µA  
±(1.5% reading + 3 digits)  
40mA  
0.01mA  
400mA 0.1mA  
4A  
0.001A  
0.01A  
±(2.5% reading + 5 digits)  
20A  
AC  
50 to 400Hz 400Hz to 1KHz  
Current  
400µA  
0.1µA  
4000µA 1µA  
±(1.8% reading ±(3.0% reading  
+ 8 digits)  
+ 7 digits)  
40mA  
0.01mA  
400mA 0.1mA  
4A  
20A  
0.001A  
0.01A  
±(3.0% reading ±(3.5% reading  
+ 8 digits) + 10 digits)  
NOTE: Accuracy is stated at 65oF to 83oF (18oC to 28oC) and less  
than 75% RH.  
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Function  
Range  
Resolution  
0.1!  
Accuracy  
Resistance 400!  
±(0.8% reading + 4 digits)  
±(0.8% reading + 2 digits)  
4k!  
40k!  
0.001k!  
0.01k!  
0.1k!  
±(1.0% reading + 2 digits)  
400k!  
4M!  
0.001M!  
0.01M!  
0.01nF  
0.1nF  
40M!  
±(3.0% reading + 5 digits)  
±(5.0% reading + 7 digits)  
±(3.0% reading + 5 digits)  
Capacitance 40nF  
400nF  
4µF  
0.001µF  
0.01µF  
0.1µF  
±(3.5% reading + 5 digits)  
40µF  
100µF  
±(5.0% reading + 5 digits)  
±(1.5% reading + 5 digits)  
Frequency 5.000Hz 0.001Hz  
50.00Hz 0.01Hz  
500.0Hz 0.1Hz  
5.000kHz 0.001kHz  
50.00kHz 0.01kHz  
500.0kHz 0.1kHz  
±(1.2% reading + 2 digits)  
±(1.5% reading + 4 digits)  
5.000MHz 0.001MHz  
10.00MHz 0.01MHz  
Sensitivity: 0.8V rms min. <100kHz; 5Vrms min > 100kHz.  
Duty Cycle 0.1 to 99.9% 0.1% ±(1.2% reading + 2 digits)  
Pulse width: 100!s - 100ms, Frequency: 5Hz to 150kHz  
Temp  
-4 to 1382°F 1°F  
-20 to 750°C 1°C  
-4 to 518°F 1°F  
-20 to270°C 1°C  
±(3.0% reading + 3 digits)  
(type-K)  
(probe accuracy not included)  
Temp  
(IR)  
±2.0% reading or ±2°C, ± 4 °F  
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.  
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Diode Test  
Test current of 0.3mA maximum,  
open circuit voltage 1.5V DC typical  
Continuity Check  
Audible signal will sound if the  
resistance is less than 150  
(approx.), test current <0.7mA  
Temperature Sensor  
IR Spectral response  
IR Emissivity  
Requires type K thermocouple  
6 to 16!m  
0.95 fixed  
IR distance ratio  
Input Impedance  
AC Response  
8:1  
>7.5M" (VDC & VAC)  
True rms  
ACV Bandwidth  
Display  
Overrange indication  
Auto Power Off  
Polarity  
50Hz to 1kHz  
4000 count backlit liquid crystal  
“OL” is displayed  
15 minutes (approximately)  
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  
one 9 volt (NEDA 1604) battery  
mA, !A ranges; 0.5A/250V fast blow  
A range; 20A/250V ceramic fast  
blow  
Battery  
Fuses  
Operating Temperature  
Storage Temperature  
Relative Humidity  
Operating Altitude  
Weight  
32oF to 122oF (0oC to 50oC)  
-4oF to 140oF (-20oC to 60oC)  
<70% operating, <80% storage  
7000ft. (2000) meters maximum.  
0.753lb (342g) (includes holster).  
Size  
7.36” x 3.2” x 2.0” (187 x 81 x  
50mm) (includes holster)  
Safety  
For indoor use and in accordance  
with the requirements for double  
insulation to IEC1010-1 (1995):  
EN61010-1 (1995) Overvoltage  
Category III, Pollution Degree 2.  
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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.  
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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. 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. 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.  
4. Read the voltage in the display.  
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AC VOLTAGE 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 SELECT button to  
indicate “AC” on the display.  
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  
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.  
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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 4000A DC, set the  
function switch to the !A  
position and insert the red test  
lead banana plug into the  
(A/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 (A/mA)  
jack.  
4. For current measurements up  
to 20A DC, set the function  
switch to the A range and  
insert the red test lead  
banana plug into the (20A)  
jack.  
5. Remove power from the circuit under test, then open up the  
circuit at the point where you wish to measure current.  
6. 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.  
7. Apply power to the circuit.  
8. Read the current in the display.  
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AC CURRENT MEASUREMENTS  
WARNING: To avoid electric shock, do not attempt to  
measure AC A in circuits that have voltages which exceed  
250V AC.  
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 4000A AC, set the function  
switch to the A position and  
insert the red test lead banana  
plug into the (A/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 (A/mA) jack.  
4. For current measurements up  
to 20A AC, set the function  
switch to the A range and  
insert the red test lead banana  
plug into the (20A) jack.  
5. Press the SELECT 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 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.  
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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  
!
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. 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.  
4. Read the resistance in the display.  
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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  
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 SELECT button to  
indicate ꢀꢀꢀꢀ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 150, the audible  
signal will sound. If the circuit is  
open, the display will indicate “OL”.  
DIODE TEST  
1. Set the function switch to the  
position  
2. Insert the black test lead banana  
plug into the negative COM jack  
and the red test lead banana plug  
into the positive diode jack.  
3. Press the SELECT button to  
indicate ꢀꢀꢀꢀꢀꢀon the display.  
4. Touch the test probes to the  
diode under test. Forward voltage  
will typically indicate 0.400 to  
0.700mV. Reverse voltage will  
indicate “OL”. Shorted devices  
will indicate near 0mV. Shorted  
devices will indicate near 0mV  
and an open device will indicate  
OL” in both polarities.  
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CONTACT TEMPERATURE MEASUREMENTS  
1. Set the function switch to the (K) 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.  
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NON-CONTACT TEMPERATURE MEASUREMENTS  
1. Set the function switch to the Non-Contact (IR) ºF or ºC position.  
2. Point the meter at the surface to be measured.  
3. If needed, press the red IR Laser Pointer button to locate the  
exact spot being measured.  
4. The area of the surface to be measured must be larger than the  
spot size as determined by the distance to spot size  
specification.  
5. Read the temperature in the display.  
WARNING: Do not directly view or direct the laser pointer  
at an eye. Low power visible lasers do not normally present a  
hazard, but may present some potential for hazard if viewed  
directly for extended periods of time.  
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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 function switch to the  
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 (CAP) jack.  
3. Touch the test leads to the  
capacitor to be tested.  
4. Read the capacitance value in  
the display  
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FREQUENCY MEASUREMENTS  
1. Set the function switch to the  
“FREQ %” position.  
2. Insert the black lead banana  
plug into the negative COM  
jack and the red test lead  
banana plug into the positive  
Hz jack.  
3. Touch the test probe tips to the  
circuit under test.  
4. Read the frequency on the  
display.  
% DUTY CYCLE  
1. Set the function switch to the  
“FREQ %” position.  
2. Insert the black lead banana  
plug into the negative COM  
jack and the red test lead  
banana plug into the positive Hz jack.  
3. Press the SELECT key momentarily  
to select % in the display.  
4. Touch the test probe tips to the circuit  
under test.  
5. Read the % duty cycle on the display.  
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AUTORANGE/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  
until you select the range you want.  
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,  
Frequency and Temperature functions.  
RELATIVE MODE  
The relative measurement feature allows you to make  
measurements relative to a stored 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 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 and hold the HOLD key for >1 second to turn on or off the  
display backlight function.  
Note: The HOLD feature will activate when the Backlight is  
turned on. Press the HOLD key again to exit Data Hold.  
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DATA HOLD  
The hold function freezes the reading in the display. Press the  
HOLD key momentarily to activate or to exit the hold function.  
Note: In the Frequency mode, Data Hold will function only while  
a frequency is applied.  
AUTO POWER OFF  
The auto off feature will turn the meter off after 20 minutes.  
LOW BATTERY INDICATION  
The  
icon will appear in the lower left corner of the display  
when the battery voltage becomes low. Replace the battery  
when this appears.  
WRONG CONNECTION INDICATION  
The  
icon will appear in the upper right corner of the display  
and the buzzer will sound whenever the positive test lead is  
inserted into the 20A or uA/mA input jack and a non-current  
function is selected. If this occurs, turn the meter off and reinsert  
the test lead into the proper input jack for the function selected.  
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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.  
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BATTERY REPLACEMENT  
WARNING: To avoid electric shock, disconnect the test leads  
from any source of voltage before removing the battery cover.  
1. When the battery becomes exhausted or drops below the  
operating voltage, “ ” will appear in the left-hand side of the  
LCD display. The battery should be replaced.  
2. Follow instructions for installing batteries. See the Battery  
Installation section of this manual.  
3. Dispose of the old batteries properly.  
WARNING: To avoid electric shock, do not operate your 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.  
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FUSE REPLACEMENT  
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 protective rubber holster.  
3. Remove the battery cover (two “B” screws).  
4. Disconnect and remove the battery.  
5. Remove the four “A” screws securing the rear cover.  
6. Remove the rear cover.  
7. Lift the center circuit board straight up from the connectors to  
gain access to the fuse holders.  
8. Gently remove the old fuse and install the new fuse into the  
holder.  
9. Always use a fuse of the proper size and value (0.5A/250V fast  
blow for the 400mA range, 20A/250V fast blow for the 20A  
range).  
10. Align the center board with the connectors and gently press  
into place.  
11. Replace and secure the rear cover, battery, battery cover and  
screws.  
WARNING: To avoid electric shock, do not operate your meter  
until the battery cover is in place and fastened securely.  
25  
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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  
82376  
Description  
Fuse kit  
93894  
9V battery  
82378  
Set of black and red Test Leads  
Replacement battery cover  
Front Cover  
Rear cover screws  
Thermocouple probe  
81079-D  
81079-C  
81079-CS  
82377  
For replacement parts shipped directly to your home  
Call 9 am – 5 pm Eastern Time, M - F  
1-888-326-1006  
26  
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