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Summary of Contents for Morris 57074
- Page 1 3 3/4 Digit Multimeter Model 57074 Users Manual...
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Page 2: Table Of Contents
Table of Content Introduction ………………………………………………………………………………………….. 1 Unpacking and Inspection ………………………………………………………….………….… 2 Safety Precautions …………………………………………………………………….……………. 2 A Quick Tour …………………………………………………………………………….………….… 2 Symbol Explanation …….…………………………………………………………………….… 6 Instrument Layout ……………………………………………………….………….…………… 7 Functions of Keys ……………………………………………………………….…….………… 9 Others …………………………………………………………………………………..……….. 11 Making Measurements ……………………………………………………………………………. 13 Measuring AC or DC Volts …………………………………………………………..……….. - Page 3 Specifications ………………………………………………………..……..…………………… 23 General Specifications ……………………………………………………………...………… 23 Accuracy and Resolution ……………………………………………………………………… 24 Maintenance …………………………………………………………………..…………………… 28 Replacing the battery ………………………………………………………….……………… 28 Replacing the Fuse ……………………………………………………………..…………… 29 Others …………………………………………………………………………………………… 30 RS232C serial data output ……………………………………………….……………………… 30...
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Page 4: Introduction
3 3/4 Digit Multimeter Users Manual Introduction This is a high performance, low power consumption and 3 3/4 digits (4000 Counts) mutimeter. The meter is made with a large integrated circuit. Includes manual and auto range and all functions and ranges are protected for overload. Measures AC/DC voltage, AC/DC current, resistance, diode, continuity, capacitance, frequency, duty and temperature. - Page 5 3 3/4 Digit Multimeter Users Manual Safety Information The meter has been designed according to IEC1010-1 concerning safety requirements for electrical measuring instruments with an over voltage category (1000V CAT.Ⅲ ) & pollution 2. WARNING: READ “SAFETY INFORMATION” AND “WARNING INFORMATION”...
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Page 6: Safety Precautions
3 3/4 Digit Multimeter Users Manual Safety Precautions Injury or death can occur even with low voltages and low current. It is extremely important that you read this safety information before using your multimeter. Follow all safety practices and proper operating procedures for equipment being tested. ... - Page 7 3 3/4 Digit Multimeter Users Manual leads and any input signals before replacing the battery. Do not operate this multimeter in an explosive atmosphere (i.e., in the presence of flammable gases or fumes, vapor or dust.). Measuring voltage that exceeds the limits of the multimeter may damage the meter and expose the operator to a shock hazard.
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Page 8: A Quick Tour
3 3/4 Digit Multimeter Users Manual A Quick Tour 1. Symbol Explanation Attention! Low Battery Dangerous Voltage! Fuse European union Ground directives Double Insulation - 5 -... -
Page 9: Instrument Layout
A Quick Tour Instrument Layout 2. Instrument Layout ①. LCD AUTO RS232 ¡ ã ②. Keys: select measuring function ¡ ã F ③. Function/Range selector rotary switch ④. 10A input terminal: This is positive input terminal SELECT RANGE HOLD for measuring 10A current, which connect with the LIGHT DUTY red test lead. - Page 10 3 3/4 Digit Multimeter Users Manual 3. Keys Function SELECT (Function Switch): Select is the function selecting key that acts with trigger. Use the key as measuring functions select. RANGE (Auto/Manual Range): This key is the auto/manual key. Power on default is auto measurement, and press one time to switch to the manual measurement.
- Page 11 3 3/4 Digit Multimeter Users Manual HOLD/LIGHT (Reading Hold/Back Light): Hold/BL key is the reading bold/back light control key. Press the key, the display value will be locked and unchanged. Press the key again, the locked status will be erased and enter the normal measurement status.
- Page 12 3 3/4 Digit Multimeter Users Manual 4. Other Functions Auto power off: In the process of measuring, using the function key or switch, if there is no any action on them within 30 minutes, the meter will auto power off (standby mode). In auto power off status, press the function key or switch, the meter will be auto power on (operating mode).
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Page 13: Making Measurements
Making Measurements Measuring AC or DC Voltage Making Measurements 1. Measuring AC or DC Voltage Turn the rotary switch to ACV or DCV or DCmV range. Insert the black and red test leads into the COM and VΩ Hz input terminal. Connect the test lead tips in parallel with the circuit to be measured. -
Page 14: Measuring Dc Or Ac Current
3 3/4 Digit Multimeter Users Manual 2. Measuring AC or DC Current μ Turn the rotary switch to A, mA or A range. Power on default is DC measurement, press one time SELECT key to switch to AC measurement. μ Insert the red and black test leads into the AmA or A and COM input terminal. -
Page 15: Measuring Resistance
Making Measurements Measuring Resistance 3. Measuring Resistance Ω a) Turn the rotary switch to the range. Ω b) Insert the black and red test leads into the COM and V Hz input terminal. c) Connect the test lead tips in parallel with the circuit to be measured. And don’t touch any electrical conductors. -
Page 16: Measuring Capacitance
Making Measurements Test Diode 4. Measuring capacitance a) Turn the rotary switch to the capacitance range. Ω b) Insert the black and red test leads into the COM and V Hz input terminal. c) Connect the test lead tips in parallel with the circuit to be measured. And don’t touch any electrical conductors. -
Page 17: Measuring Frequency And Duty
Making Measurements Test Diode 5. Measuring Frequency and Duty a) Turn the rotary switch to the Hz range. Ω b) Insert the black and red test leads into the COM and V Hz input terminal. c) Connect the test lead tips in parallel with the circuit to be measured. And don’t touch any electrical conductors. -
Page 18: Measuring Temperature
Making Measurements Test Diode 6. Measuring temperature a) Turn the rotary switch to the temperature range. b) Insert the Thermocouple into the COM and μ AmA input terminal. c) Put the Thermocouple’s other side on the object to be measured. d) Read the result directly from LCD. - Page 19 Making Measurements Test Diode 7. Test Diode Ω a) Turn the rotary switch to the range. Ω b) Insert the black and red test leads into the COM and V Hz input terminal, and press SELECT key to select diode status. c) Connect the test leads tip in parallel with the diode to be measured.
- Page 20 3 3/4 Digit Multimeter Users Manual 8. Test Continuity Ω a) Turn the rotary switch to the range. Ω b) Insert the black and red test leads into the COM and V Hz input terminal; and press SELECT key to select continuity status. c) Connect the test lead tips in parallel tow point at the circuit, if the resistance is less Ω...
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Page 21: Specifications
3 3/4 Digit Multimeter Users Manual Specifications 1. General specifications Maximum voltage between terminals and earth ground: 1000V DC or 700V AC. Display: 3999 counts, fully annunciates automatic polarity. Over range: “OL” will be displayed. Low battery: “ ” will be displayed Updates: approx. -
Page 22: Accuracy And Resolution
3 3/4 Digit Multimeter Users Manual Accuracy and Resolution Accuracy is given as ± (%reading +digits) at 18~28°C, relative humidity up to 80% All specifications assume less than 1 year a) DC voltage Range Resolution Accuracy(%rdg +digits) 400mV 0.1mV 0.001V ±（0.5%+3）... - Page 23 3 3/4 Digit Multimeter Users Manual b) AC voltage Range Resolution Accuracy(%rdg +digits) 0.001V ±（0.8%+3） 0.01V 400V 0.1V ±（1.2%+3） 700V Ω Input impedance: 10M Overload protection: 1000V DC or 700V AC Frequency range: 40~400Hz. c) DC current Range Resolution Accuracy(%rdg +digits) 400μ...
- Page 24 3 3/4 Digit Multimeter Users Manual d) AC current Range Resolution Accuracy(%rdg +digits) 400μ A 0.1μ A ±（1.5%+3） 4000μ A 1μ A 40mA 0.01mA 400mA 0.1mA ±（3.0%+3） 0.01A μ Overload protection: A/mA ----- F0.5A/250V A ----- F10A/250V Frequency range: 40~400Hz. e) Resistance Range Resolution...
- Page 25 3 3/4 Digit Multimeter Users Manual 4MΩ 1kΩ ±（2.0%+3） 40MΩ 10kΩ Overload protection: 1000Vp Open circuit voltage: 0.45V - 21 -...
- Page 26 Specifications Accuracy and Resolution f) Capacitance Range Resolution Accuracy(%rdg +digits) ±（5%+10） 50nF 10PF <10nF: ±（5%+50） 500nF 100PF 5μ F ±（3%+3） 10nF 50μ F 100nF 100μ F Overload protection: 1000Vp g) Frequency and Duty Range Resolution Accuracy(%rdg +digits) ±（0.2%+3） 5Hz~ 50kHz 50kHz~ 5MHz reference 0.1~ 99.9%...
- Page 27 3 3/4 Digit Multimeter Users Manual h) Temperature Range Resolution Accuracy(%rdg +digits) -20~ 400°C 0.1°C ±（3%+2°C） 400~ 1000°C 1°C Overload protection: F0.5A/250V i) Diode and Continuity Range Resolution Note diode 0.5~0.8V ≤ 50Ω continuity 0.1Ω Overload protection: 1000Vp - 23 -...
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Page 28: Maintenance
Maintenance Replacing battery Maintenance 1. Replacing battery If the meter display “ ” on LCD, the battery must be replaced to maintain proper operation. Following procedure to replacing the battery: a) Press POWER key to off. Disconnect text leads from any live source and remove the test leads from the input terminals. -
Page 29: Replacing The Fuse
3 3/4 Digit Multimeter Users Manual 2. Replacing fuse Following procedure to replace the fuse: a) Press POWER key to off. And disconnect test leads from any live source and remove the test leads from the input terminals. b) Remove the two screws on the battery cover and open the cover. c) Remove the blown fuse and replace with fuse of the same size and rating. -
Page 31: Rs232C Serial Data Output
RS232C Serial data output The meter has the serial data output function. When the meter is connected with a computer that has installed interface (RS232) software, it can output the measuring data for recording, analyzing, processing and printing the measuring results.
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