Craftsman 81079 Owner's Manual
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Craftsman 81079 Owner's Manual

True rms multimeter with ir thermometer
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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.
© Sears, Roebuck and Co., Hoffman Estates, IL 60179 U.S.A.
www.craftsman.com
• Safety
• Operation
• Maintenance
• Español
062006

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Summary of Contents for Craftsman 81079

  • Page 1 Owner's Manual True RMS Multimeter with IR Thermometer Model No. 81079 • Safety CAUTION: Read, understand and • Operation follow Safety Rules and Operating Instructions in this manual before • Maintenance using this product. • Español © Sears, Roebuck and Co., Hoffman Estates, IL 60179 U.S.A.

  • Page 2: Table Of Contents

    TABLE OF CONTENTS Warranty Page 3 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...

  • Page 3: Warranty

    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.

  • Page 4: Safety Instructions

    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. NEVER apply voltage or current to the meter that exceeds the specified maximum: Input Limits Function Maximum Input...

  • Page 5: Safety Symbols

    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 WARNING hazardous situation, which if not avoided, could result in death or serious injury.

  • Page 6: Control And Jacks

    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.

  • Page 7: Specifications

    SPECIFICATIONS Function Range Resolution Accuracy 400mV 0.1mV ±(0.3% reading + 2 digits) Voltage 0.001V ±(0.5% reading + 2 digits) 0.01V 400V 0.1V 600V ±(0.8% reading + 3 digits) 50 to 400Hz 400Hz to 1kHz Voltage 400mV 0.1mV ±(1.5% reading ±(2.5% reading + 15 digits) + 15digits) 0.001V...
  • Page 8 Function Range Resolution Accuracy Resistance ±(0.8% reading + 4 digits) 0.001k ±(0.8% reading + 2 digits) 0.01k ±(1.0% reading + 2 digits) 400k 0.1k 0.001M 0.01M ±(3.0% reading + 5 digits) Capacitance 40nF 0.01nF ±(5.0% reading + 7 digits) 400nF 0.1nF ±(3.0% reading + 5 digits) 4µF...
  • Page 9 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 Requires type K thermocouple IR Spectral response 6 to 16 m IR Emissivity 0.95 fixed IR distance ratio...

  • Page 10: Battery Installation

    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.

  • Page 11: Operating Instructions

    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.

  • Page 12: Ac Voltage Measurements

    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.

  • Page 13: Dc Current Measurements

    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.

  • Page 14: Ac Current Measurements

    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.

  • Page 15: Resistance Measurements

    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...

  • Page 16: Continuity Check

    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.

  • Page 17: Contact Temperature Measurements

    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.

  • Page 18: Non-Contact Temperature Measurements

    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.

  • Page 19: Capacitance Measurements

    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.

  • Page 20: Frequency Measurements

    FREQUENCY MEASUREMENTS Set the function switch to the “FREQ %” position. Insert the black lead banana plug into the negative COM jack and the red test lead banana plug into the positive Hz jack. Touch the test probe tips to the circuit under test.

  • Page 21: Autorange/Manual Range Selection

    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: Press the RANGE key.

  • Page 22: Data Hold

    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.

  • Page 23: Maintenance

    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.

  • Page 24: Battery Replacement

    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.

  • Page 25: Fuse Replacement

    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.

  • Page 26: Troubleshooting

    SERVICE AND PARTS Item Number Description 82376 Fuse kit 93894 9V battery 82378 Set of black and red Test Leads 81079-D Replacement battery cover 81079-C Front Cover 81079-CS Rear cover screws 82377 Thermocouple probe For replacement parts shipped directly to your home Call 9 am –...

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