Owner's Manual True RMS Multimeter with IR Thermometer Model No. 81079 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.
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 Contact Temperature Measurements Non-Contact Temperature Measurements Capacitance Measurements Frequency Measurements % Duty Cycle Measurements Autorange/Manual Range Selection Relative Mode Display B
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.
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.
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.
CONTROLS AND JACKS 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. IR Thermometer and laser pointer 4000 count LCD display HOLD and Backlite button SELECT button Function switch mA, uA and A input jacks COM input jack Positive input jack RANGE hold button RELATIVE button Laser pointer button Note: Tilt stand and battery compartment are on rear of unit.
SPECIFICATIONS Function Range DC 400mV Voltage 4V 40V 400V 600V AC Voltage DC Current AC Current Resolution Accuracy 0.1mV ±(0.3% reading + 2 digits) 0.001V 0.01V 0.1V 1V 400mV 0.1mV 4V 40V 400V 600V 0.001V 0.01V 0.1V 1V 400µA 0.1µA 4000µA 1µA 40mA 400mA 4A 20A 0.01mA 0.1mA 0.001A 0.01A 400µA 0.1µA 4000µA 1µA 40mA 400mA 4A 20A 0.01mA 0.1mA 0.001A 0.01A ±(0.5% reading + 2 digits) ±(0.8% reading + 3 digits) 50 to 400Hz 400Hz to 1kHz ±(1.5% reading ±(2.
Function Range Resistance 400! 4k! 0.001k! 40k! 0.01k! 400k! 0.1k! 4M! 0.001M! 40M! ±(0.8% reading + 2 digits) ±(1.0% reading + 2 digits) 0.01M! ±(3.0% reading + 5 digits) 0.01nF ±(5.0% reading + 7 digits) 400nF 0.1nF ±(3.0% reading + 5 digits) 4µF 0.001µF 40µF 0.01µF 100µF 0.1µF Capacitance 40nF Frequency Resolution Accuracy 0.1! ±(0.8% reading + 4 digits) ±(3.5% reading + 5 digits) ±(5.0% reading + 5 digits) Duty Cycle 5.000Hz 0.001Hz ±(1.5% reading + 5 digits) 50.00Hz 0.
Diode Test Continuity Check Temperature Sensor IR Spectral response IR Emissivity IR distance ratio Input Impedance AC Response ACV Bandwidth Display Overrange indication Auto Power Off Polarity Measurement Rate Low Battery Indication Battery Fuses Operating Temperature Storage Temperature Relative Humidity Operating Altitude Weight Size Safety Test current of 0.3mA maximum, open circuit voltage 1.5V DC typical Audible signal will sound if the resistance is less than 150! (approx.), test current <0.
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.
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.
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.
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 4000!A DC, set the function switch to the !A position and insert the red test lead banana plug into the (!A/mA) jack. 3.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
FUSE REPLACEMENT WARNING: To avoid electric shock, disconnect the test leads from any source of voltage before removing the battery cover. 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. Disconnect the test leads from the meter. Remove the protective rubber holster. Remove the battery cover (two “B” screws). Disconnect and remove the battery. Remove the four “A” screws securing the rear cover. Remove the rear cover. Lift the center circuit board straight up from the connectors to gain access to the fuse holders.
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.