OPERATOR’S INSTRUCTION MANUAL M-1750 3 3/4 COUNT DIGITAL MULTIMETER Elenco Electronics, Inc. TM 150 W. Carpenter Avenue Wheeling, IL 60090 (847) 541-3800 http://www.elenco.com e-mail: elenco@elenco.com Copyright © 2003 Elenco Electronics, Inc.
Contents 1. Safety Information 3 2. Introduction 4 3. Features 5 4. Specifications 4-1 General Specifications 4-2 Measurement Specifications 5 5 6 5. Operation 5-1 Check the Batteries 5-2 Front Panel Description 5-3 How to Make a Measurement 8 8 8 10 6.
1. Safety Information To ensure that the meter is used safely, follow all of the safety and operation instructions in this manual. If the meter is not used as described in the manual, the safety features of the meter might be impaired. • Do not use the meter if the meter or the test leads look damaged, or if you suspect that the meter is not operating properly. • Turn off the power to the circuit under test before cutting, unsoldering, or breaking the circuit. Small amounts of current can be dangerous.
Safety Symbols ! This marking adjacent to another marking, terminal, or operating device indicates that the operator must refer to the explanation in the operating instructions to avoid damage to the equipment and/or to avoid personal injury. WARNING This WARNING sign denotes a hazard. It calls attention to a procedure, practice or the like, which if not correctly performed or adhered to, could result in personal injury. CAUTION 500V max. This CAUTION sign denotes a hazard.
6. Care and Maintenance 6-1. Caring for Your Multimeter Your digital multimeter is an example of superior design and craftsmanship. The following suggestions will help you care for the multimeter so you can enjoy it for years. 1. Keep the multimeter dry. If it gets wet, wipe it dry immediately. Liquids can contain minerals that can corrode electronic circuits. 2. Use and store the multimeter only in normal temperature environments.
4-2. Measurement Specifications (5) Frequency and Duty Cycle Measurement Accuracy is +(% of reading + number in last digit) at 73OF (23OC) +9OF (+5OC), <75% RH. 1. Connect the black test lead to the “COM” socket and the red test lead to the “VWHz” socket. 2. Set the selector switch to the “Hz” or “Duty” position. 3. Connect the probes across the source or load under measurement. DC Voltage Range Resolution 400mV 4V 40V 400V 600V 100mV 1mV 10mV 100mV 1V Accuracy +(0.5% +(0.5% +(0.5% +(0.5% +(0.
5-3. How to Make a Measurement (1) DC/AC Voltage Measurement 1. Connect the black test lead to the “COM” socket and the red test lead to the “VWHz” socket. 2. Set the selector switch to the desired “V” position, and press the “DC/AC” button to choose the function. If the magnitude of the voltage is not known, set the selector switch to the highest range and reduce until a satisfactory reading is obtained. 3. Connect the probes across the source or load under measurement. (2) DC/AC Current Measurement 1.
5. Operation WARNING 1. When measuring voltage, be sure that the instrument is not connected or switched to the resistance range. Always ensure that the correct terminals are used for the type of measurement to be made. 2. Use extra care when measuring voltage above 50V, especially from sources where high voltage is present. 3. Avoid making connections to live circuits whenever possible. 4. When making current measurements, be sure that the circuit is not live before opening it to connect the test leads. 5.
