Specifications:204/204689-m1740.pdf file (21 Oct 2023)
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Elenco Electronics M-1740 Multimeter PDF Operating Instructions (Updated: Saturday 21st of October 2023 07:16:48 PM)
Rating: 4.9 (rated by 21 users)
Compatible devices: M-2795, M-1005K, M-3900, M-1750, M-1008K, M-2625, M-1700, M-1150K.
Recommended Documentation:
OPERATING INSTRUCTIONS ELENCO M-1740 DIGITAL MULTIMETER OPERATION Before taking any measurements, read the Safety Information Section. Always examine the instrument for damage, contamination (excessive dirt, grease, etc.) and defects. Examine the test leads for cracked or frayed insulation. If any abnormal conditions exist, do not attempt to make any measurements. Voltage Measurements 1. Connect the red test lead to the “VΩA” jack and the black test lead to the “COM” jack. 2. Set the Function/Range switch to the desired current range and slide the “AC/DC” selector switch to the desired voltage type. If magnitude of voltage is not known, set switch to the highest range and reduce until a satisfactory reading is obtained. 3. Connect the test leads to the device or circuit being measured. 4. For DC, a (-) sign is displayed for negative polarity; positive polarity is implied. Current Measurements 1. Set the Function/Range switch to the desired current range and slide the “AC/DC” selector switch to the desired current type. 2. For current measurements less than 200mA, connect the red test lead to the “VΩA” jack and the black test lead to the COM jack. 3. For current measurements over 200mA or greater, connect the red test lead to the 10A jack and the black test lead to the COM jack. SAFETY INFORMATION The following safety information must be observed to insure maximum personal safety during the operation of this meter: 1. Do not use the meter if the meter or test leads look damaged, or if you suspect that the meter is not operating properly. 2. This meter is not recommended for high voltage industrial use; for example, not for measurements of 440VAC or 600VAC industrial power mains. The unit is intended for use with low energy circuits to 600V AC/DC or high energy circuits to 250VAC or DC. Accidental misuse by connection across a high voltage, high energy power source when the meter is set up for mA measurement may be very hazardous. 3. Turn off power to the circuit under test before cutting, unsoldering, or breaking the circuit. Small amounts of current can be dangerous. 4. Use caution when working above 60VDC or 30VAC rms. Such voltages pose a shock hazard. 5. When using the probes, keep your fingers behind the finger guards on the probes. 6. Measuring voltage which exceeds the limits of the multimeter may damage the meter and expose the operator to a shock hazard. Always recognize the meter voltage limits as stated on the front of the meter. 7. If the equipment is used in a manner not specified by the manufacturer, the protection provided by the equipment may be impaired. 4. Remove power from the circuit under test and open the normal circuit path where the measurement is to be taken. Connect the meter in series with the circuit. 5. Do not continually measure 10A as the shunt wire will heat up. Allow 60 seconds max. At 5A or less, continuous use is OK. Resistance and Continuity Measurements 1. Set the Function/Range switch to the desired resistance range or continuity position. 2. Remove power from the equipment under test. 3. Connect the red test lead to the “VΩA” jack and the black test lead to the “COM” jack. 4. Touch the probes to the test points. In ohms, the value indicated in the display is the measured value of resistance. In continuity test, the beeper sounds continuously, if the resistance is less than 40Ω +/-20Ω. WARNING The accuracy of the functions might be slightly affected when exposed to a radiated electromagnetic field environment, e.g. radio, telephone or similar. Diode Tests 1. Connect the red test lead to the “VΩA” jack and the black test lead to the “COM” jack. 2. Set the Function/Range switch to the “ ” position. 3. Turn off power to the circuit under test. 4. Touch probes to the diode. A forward-voltage drop is about 0.6V (typical for a silicon diode). 5. Reverse probes. If the diode is good, “OL” is displayed. If the diode is shorted, “.000” or another number is displayed. SPECIFICATIONS Display: 3 1/2 digit liquid crystal display (LCD) with a maximum reading of 1999. Polarity: Automatic, positive implied, negative polarity indication. Overrange: (OL) or (-OL) is displayed. Zero: Automatic. Low Battery Indication: The “ ” is displayed when the battery voltage drops below the operating level. Measurement Rate: 2.5 times per second, nominal. Operating Environment: 0 O C to 40 O C at <70% relative humidity. Storage Temperature: -20 O C to 60 O C, 0 to 80% R.H. with battery removed from meter. Accuracy: Stated accuracy at 23 O C +/-5 O C, <75% relative humidity. Safety: According to EN61010-1 protection class II over- voltage category (CAT II 600V) pollution degree 2. Power: Single standard 9-volt battery, NEDA 1604, JIS 006P, IEC 6F22. Battery Life: 150 hours typical with carbon-zinc. Dimensions: 151mm (H) x 70mm (W) x 38mm (D). Weight: Approx. 7 oz. (200g.) including battery. Accessories: One pair test leads, one spare fuse, 9V battery (installed) and operating instructions. 6. If the diode is open, “OL” is displayed in both directions. 7. If the junction is measured in a circuit and a low reading is obtained with both lead connections, the junction may be shunted by a resistance of less than 1kΩ. In this case, the diode must be disconnected from the circuit for accurate testing. Transistor Gain Measurements 1. Set the Function/Range switch to the desired h FE range (PNP or NPN type transistor). 2. Never apply an external voltage to the hFE socket. Damage to the meter may result. 3. Plug the transistor directly into the hFE socket. The sockets are labeled E, B, and C for emitter, base and collector. 4. Read the transistor hFE (DC gain) directly from the display. Frequency Measurements 1. Set the Function/Range switch to the Hz position. 2. Connect the red test lead to the “VΩA” jack and the black test lead to the “COM” jack. 3. Connect the test leads to the point of measurement and read the frequency from the display. Capacitance Measurements 1. Set the Function/Range switch to the desired F (capacitance) range. 2. Never apply an external voltage to the Cx sockets. Damage to the meter may result. 3. Insert the capacitor leads directly into the Cx socket. 4. Read the capacitance directly from the display. + MAINTENANCE Battery Replacement Power is supplied by a 9 volt “transistor” battery (NEDA 1604, IEC 6F22). The “ ” appears on the LCD display when replacement is needed. To replace the battery, remove the two screws from the back of the meter and lift off the front case. Remove the battery from battery contacts. Fuse Replacement If no current measurements are possible, check for a blown overload protection fuse. There are two fuses; F1 for the “VΩA” jack and F2 for the 10A jack. For access to fuses, remove the two screws from the back of the meter and lift off the front case. Replace F1 only with the original type 0.8A/250V, fast acting fuse. Replace F2 only with the original type 10A/600V, fast acting ceramic fuse. Cleaning Periodically wipe the case with a damp cloth and detergent, do not use abrasives or solvents. 753054 WARNING Remove test leads before changing battery or performing any servicing. + DC Accuracy AC Accuracy Input Impedance Maximum Input Voltage +/-(1.9%rdg+4dgts) 500VDC or ACrms (AC 50Hz - 500Hz) +/-(0.5%rdg+1dgt) on 600V range 10MΩ on 200mV range +/-(1.0%rdg+4dgts) 600VDC or ACrms on all other ranges on all other ranges Current A DC Accuracy AC Accuracy Voltage Burden Input Protection mA +/-(1.0%rdg+1dgt) +/-(2.0%rdg+4dgts) 0.7V 0.5A/250V fuse 10A +/-(3.0%rdg+1dgt) +/-(3.5%rdg+4dgts) 1.2V 10A/600V fuse Range Accuracy Test Condition Input Protection 200Ω +/-(0.8%rdg+3dgts) 3.0VDC Ohm 2kΩ - 2,000kΩ +/-(0.8%rdg+1dgt) 0.3VDC 20MΩ +/-(3.0%rdg+3dgts) 0.3VDC 500VDC or ACrms Diode 2V +/-(3.0%rdg+3dgts) 1mA +/-0.6mA Continuity 200Ω <40Ω +/-20Ω Beeper <40Ω 3.0VDC Capacitance 2,000pF - 20µF +/-(2.0%rdg+10dgts) 2.5Hz 3V h FE 0-1,000 N/A lb = 10µA approx. Vce<3.5V Frequency 2kHz - 15MHz +/-(0.1%rdg+1dgt) Sensitivity 500VDC or ACrms (auto-range) (10Hz - 15MHz) 1.5Vrms
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