User`s Guide
Contents
1. Extech products For periodic calibration NIST certification or repair of any Extech product call customer service for details on services available Extech recommends that calibration be performed on an annual basis to insure calibration integrity Copyright 2006 Extech Instruments Corporation All rights reserved including the right of reproduction in whole or in part in any form 38070 V3 0 01 072. Weight 3 880z 110g Size 3 82x3 34x1 3 97x65x33mm Safety For indoor use and in accordance with the requirements for double insulation to IEC1010 1 1995 EN61010 1 1995 Overvoltage Category II 500V Pollution Degree 2 UL CE Approved Battery Installation WARNING To avoid electric shock always turn off the power and disconnect the test leads before opening the back to replace the fuse or battery 1 Remove the screws securing the rear cover using a Phillips head screwdriver 2 Lift the cover off and replace the battery observing the correct polarity 3 Insert the new battery into the battery holder Replace the rear cover and 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 battery to make sure that they are still good and that they are properly inserted Operating Instructions 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 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 highest V DC position 2 Insert the black test lead banana plug into the negative COM ja
3. 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 Warranty EXTECH INSTRUMENTS CORPORATION warrants this instrument to be free of defects in parts and workmanship for one year from date of shipment a six month limited warranty applies on sensors and cables If it should become necessary to return the instrument for service during or beyond the warranty period contact the Customer Service Department at 781 890 7440 ext 210 for authorization A Return Authorization RA number must be issued before any product is returned to Extech The sender is responsible for shipping charges freight insurance and proper packaging to prevent damage in transit This warranty does not apply to defects resulting from action of the user such as misuse improper wiring operation outside of specification improper maintenance or repair or unauthorized modification Extech specifically disclaims any implied warranties or merchantability or fitness for a specific purpose and will not be liable for any direct indirect incidental or consequential damages Extech s total liability is limited to repair or replacement of the product The warranty set forth above is inclusive and no other warranty whether written or oral is expressed or implied Repair and Calibration Services Extech offers complete repair and calibration services for all
4. User s Guide EXTECH INSTRUMENTS Analog Multimeter Model 38070 Introduction Safety Instructions Controls and Jacks 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 VAC 500V AC and DC mA DC 500mA DC Resistance 50V DC AC N USE EXTREME CAUTION when working with high voltages 3 DO NOT measure voltage if the voltage on the COM input jack exceeds 500V above earth ground 4 NEVER connect the meter leads across a voltage source while the function switch is in the current or resistance mode Doing so can damage the meter 5 ALWAYS discharge filter capacitors in power supplies and disconnect the power when making resistance tests 6 ALWAYS turn off power and disconnect test leads before opening the covers to replace the fuse or battery 7 NEVER operate the meter unless the back cover and the battery and fuse covers are in place and fastened securely 8 If the equipment is used in a manner not specified by the manufacturer the protection provided by the equipment may be impaired Safety Symbols Congratulations on your purch
5. ase of the Extech model 38070 Analog Multimeter This device measures AC DC Voltage DC Current Resistance and dB displaying measurements in analog format Properly used this meter will provide many years of reliable service ry Support line 781 890 7440 Technical support Extension 200 E mail support extech com Repair amp Returns Extension 210 E mail repair extech com Product specifications subject to change without notice For the latest version of this User s Guide Software updates and other up to the minute product information visit our website www extech com Extech Instruments Corporation 285 Bear Hill Rd Waltham MA 02451 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 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 This CAUTION symbol indicates a potentially hazardous situation which if not avoided may result damage to the product This symbol advises
6. ck 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 Reset the function switch to successively lower V DC positions to obtain a higher scale reading DC CURRENT MEASUREMENTS 1 Insert the black test lead banana plug into the negative COM jack 2 Set the function switch to the 250mA DC position and insert the red test lead banana plug into the mA jack 3 Remove power from the circuit under test then open up the circuit at the point where you wish to measure current 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 Apply power to the circuit 6 Read the current in the display Reset the function switch to successively lower mA positions to obtain a higher scale reading AC VOLTAGE MEASUREMENT 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
7. 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 highest V AC position 2 Insert the black test lead banana plug into the negative COM jack Insert 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 Reset the function switch to successively lower V AC positions to obtain a higher scale reading 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 X10 or X1K position 2 Insert the black test lead banana plug into the negative COM jack Insert the red test lead banana plug into the positive Q jack 3 Touch the test probe tips together and adjust the OHM Zero Adjust knob for a 0 reading F 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 on the scale dB MEASUREMENTS The dB scale can be used to measure the milliwatt power dissipation on a 6000
8. load by measuring the voltage across a 600 Q load An AC voltage of 0 775Vrms across 6000 is equal to 1mW or 0 dB When converting an AC Voltage measurement to dB take the dB reading from the lowest arc on the scale plate and then add the appropriate dB correction found in the table below ACV ADD dB 10 0 10 22 50 14 4 36 250 28 18 50 500 34 24 56 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 KEEP THE METER DRY If it gets wet dry it immediately 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
9. 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 500V 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 1 Scale 2 Pointer 3 Scale zero adjust 4 Ohms zero adjust 5 Rotary function switch 6 Positive V mA and Q input jack 7 COM input jack w as Oi Qg anaiai Specifications Function Range Accuracy DC Voltage 500V 250V 4 of full scale 50V 10V AC Voltage 500V 50 60H 2 zeal 5 of full scale 50V 10V DC Current 250mA 50Ma 4 of full scale 0 5mA Resistance PRO 10 0090 5 of full scale Rx1k 1 000 000Q Decibels 10 to 56 dB 4 ranges OdB 1mW in 6000 Max input voltage 500V AC DC Input Sensitivity 2kQ V Frequency Range 50 60Hz Battery One 1 1 5V AA battery Fuse 500mA 250 fast blow 5mmx20mm Operating Temperature 41 F to 104 F 5 C to 40 C Storage Temperature 14 F to 122 F 10 C to 50 C Operating Humidity Max 80 up to 87 F 31 C decreasing linearly to 50 at 104 F 40 C Storage Humidity lt 80 Operating Altitude 7000ft 2000meters maximum
Download Pdf Manuals
Related Search