Mastech MAS345 Operator's Instruction Manual
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Mastech MAS345 Operator's Instruction Manual

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OPERATOR'S
•
AUTO-RANGE
•
DUAL DISPLAY
•
CONFORMED IEC1010
DIGITAL MULTIMETER
INSTRUCTION MANUAL

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Summary of Contents for Mastech MAS345

  • Page 1 OPERATOR’S INSTRUCTION MANUAL • AUTO-RANGE • DUAL DISPLAY • CONFORMED IEC1010 DIGITAL MULTIMETER...

  • Page 2: Table Of Contents

    CONTENTS PAGE SAFETY INFORMATION ….……………….…………………………………………... DESCRIPTION …….………….………………………………………………………… OPERATING INSTRUCTION ..………………………………………………………… SPECIFICATIONS ………….…...……………………………………………………… ACCESSORIES ………….……………………………………………………………… BATTERY AND FUSE REPLACEMENT ……………...………………………………...

  • Page 3: Safety Information

    1. SAFETY INFORMATION The meter has been designed according to IEC-1010 concerning electronic measuring instruments with an overvoltage category (CAT II) and pollution 2. Follow all safety and operating instructions to ensure that the meter is used safely and is kept in good operating condition.
  • Page 4 electric ratings. Measuring leads must be in good condition. 1.2 DURING USE · Never exceed the protection limit values indicated in specifications for each range of measurement. · When the meter is linked to a measurement circuit, do not touch unused terminals. ·...
  • Page 5 can damage the meter. · Never perform resistance measurements on live circuits. · Always is careful when working with voltages above 60V dc or 30V ac rms. Keep fingers behind the probe barriers while measuring. 1.3 SYMBOLS Important safety information, refer to the operating manual. Dangerous voltage may be present.
  • Page 6 1.4 MAINTENANCE · Before opening the meter, always disconnect test leads from all sources of electric current. · For continue protection against fire, replace fuse only with the specified voltage and current ratings: F 15A/250V · If any faults or abnormalities are observed, the meter can not be used any more and it has to be checked out.

  • Page 7: Description

    2. DESCRIPTION This meter is an autoranging professional measuring instrument. Digit reading is 3999 counts and the bar graph consists of 38 segments for LCD, capable of performing functions: -DC voltage measuring (Auto Ranging) -AC voltage measuring (Auto Ranging) -DC current measuring -AC current measuring -Temperature measuring -Resistance measuring (Auto Ranging)

  • Page 8: R-H Button

    -Diode testing -Transistor testing -Audible continuity testing 2.1 ON/OFF SWITCH A push − push switch is used to turn the meter on or off. When the switch is push the beeper will sound. 2.2 DC/AC OR Ω / BUTTON This button is used to select DCV or ACV on voltage range, DCA or ACA on current range, Ω...
  • Page 9 the LCD. Press the button again for more than 1 second will come back the auto-range mode. When the R-H button is pushed, voltage ranges will change as: 4V → 40V → 400V → 1000V Or resistance ranges change as: 40MΩ...
  • Page 10 2.5 INPUT JACKS This meter has four input jacks that are protected against overload to the limits. During use, connect the black test lead to the COM jack and the red test lead as shown below: FUNCTION RED LEAD CONNECTION INPUT LIMITS DCV/ACV V/Ω...
  • Page 11 2.6 FRONT PANEL DISPLAY ON/OFF SWITCH .TRANSISTOR TESTING SOCKET FUNCTION SWITCH CAPACITANCE OR TEMPERATURE TESTING SOCKET INPUT JACKS RS232C SOCKET B/L BUTTON R-H BUTTON DC/AC OR Ω / BUTTON...

  • Page 12: Operating Instruction

    3. OPERATING INSTRUCTION 3.1 VOLTAGE MEASURING Connect the black test lead to the COM jack and the red test lead to the V/Ωjack. Set the function switch at V range and connect test leads across the source or load under measurement. Push the DC/AC button to select DCV or ACV measuring mode.
  • Page 13 1. Connect the black test lead to the COM jack and the red test lead to the mA jack -10- for a maximum of 400mA. For a maximum of 10A, move the red lead to the 10A jack. Set the function switch at mA or 10A range and push the DC/AC button to select DCA or ACA measuring mode.
  • Page 14 Ω 2. Set the function switch at range to be used and connect test leads across the resistance under measurement. -11- NOTE: For resistance above 1MΩ, the meter may take a few seconds to stabilize reading. This is normal for high resistance measuring. When the input is not connected, i.e.
  • Page 15 Set the function switch at nF range. Before inserting capacitor under measurement into capacitance testing socket, -12- be sure that the capacitor has been discharged fully. WARNING: Before attempting to insert capacitor for testing, always be sure that test leads have been disconnected from any measurement circuits.
  • Page 16 2. Insert “K” type thermocouple into the temperature measuring socket on front panel and contact the object to be measured with the thermocouple probe. -13- WARNING: To avoid electric shock, be sure the thermocouple has been removed before changing to another function measurement. Before attempting to insert thermocouple for testing, always be sure that test leads have been disconnected from any measurement circuits.
  • Page 17 Connect the black test lead to the COM jack and the red test lead to the V/Ω jack. (NOTE: The polarity of red test lead connection is positive “+”) position and push the Ω/ Set the function switch at button. Connect test leads to two points of the circuit under measurement.
  • Page 18 4. Read LCD display to get the forward voltage drop of the diode under testing. 3.8 TRANSISTOR TESTING Set the function switch at hFE position. Determine whether the transistor is NPN or PNP type and locate emitter, base, and collector lead Insert leads of the transistor into proper holes of the transistor testing socket on the front panel.

  • Page 19: Specifications

    Components should not be connected to the transistor socket when making voltage measurements with test leads. 3.9 INTERFACING THE METER WITH A PC (OPTION) Connect the RS232C cable between the meter and computer’s serial ports. Press ON/OFF to turn on the meter. Turn on the computer. WARNING: 1.
  • Page 20 Accuracy is specified for a period of one year after calibration and at 18℃ to 28℃ (64°F to 82°F) with relative humidity to 75%. 4.1 GENERAL Max. Voltage Between Terminals and Earth Ground: 1000V dc or 750V rms ac (sine) Power Supply: 9V NEDA1604 6F22 006P Ranging Method: Auto / Manual Display: LCD, 3999 counts max and bar graph consists of 38 segments...
  • Page 21 Overrange Indication: “OL” displayed Polarity Indication: “-” displayed automatically Low Battery Indication: “ ”displayed Operating Temperature: 5℃to 35℃(41°F to 95°F) Storage Temperature: -10℃ to 60℃(14°F to 140°F) Dimension: 78mm×186mm×35mm Weight: 300g(Including battery) -18-...
  • Page 22 4.2 DC VOLTAGE Range Resolution Accuracy ±0.5% of rdg±3 digits 10mV 400V 0.1V ±0.8% of rdg±3 digits 1000V Input Impedance: 10MΩ. -19-...
  • Page 23 4.3 AC VOLTAGE Range Resolution Accuracy ±1.2% of rdg±5 digits 10mV 400V 0.1V ±1.5% of rdg±5 digits 750V Input Impedance: 10MΩ Frequency Range: 40 to 400Hz Response: Average, calibrated in rms of sine wave. -20-...
  • Page 24 4.4 RESISTANCE Range Resolution Accuracy 400Ω 0.1Ω 4kΩ 1Ω ±1.2% of rdg±3 digits 40kΩ 10Ω 400kΩ 0.1kΩ 4MΩ 1kΩ ±3.0% of rdg±5 digits 40MΩ 10kΩ Maximum Open Circuit Voltage: 3.0V Overload Protection:250V dc or rms.ac for all ranges. -21-...
  • Page 25 4.5 DC CURRENT Range Resolution Accuracy 1μA ±1.2% of rdg±3 digits 400mA 0.1mA ±2.0% of rdg±8 digits 10mA Overload Protection: F 15A/250V fuse for 10A range. -22-...
  • Page 26 4.6 AC CURRENT Range Resolution Accuracy 1μA ±1.5% of rdg±8 digits 400mA 0.1mA ±3.0% of rdg±8 digits 10mA Overload Protection: F 15A/250V fuse for 10A range. Frequency Range: 40 to 400Hz Response: Average, calibrated in rms of sine wave. -23-...
  • Page 27 4.7 CAPACITANCE Range Resolution Accuracy ±4.0% of rdg±5 digits 400nF 0.1nF 4.8 TEMPERATURE Range Resolution Accuracy ±3.0% of rdg±3 digits 0℃ to 400℃ 1℃ ±3.0% of rdg±5 digits 401℃ to 750℃ 1℃ -24-...
  • Page 28 4.9 AUDIBLE CONTINUITY Function Description Built-in buzzer will sound, if resistance is lower than 30Ω. 4.10 DIODE Function Resolution Test Current Open Circuit Voltage 25μA 3.0V 4.11 TRANSISTOR Function Range Base Current 1 to 1000 10μA 3.0V -25-...

  • Page 29: Accessories

    5. ACCESSORIES 5.1 SUPPLIED WITH THE METER • Operating Manual • Set of test leads • 9V battery. NEDA1604 6F22 006P • “K” type thermocouple 5.2 OPTIONAL ACCESSORY • Holster • RS232C Cable • Set of 3.5” 1.44MB disk -26-...

  • Page 30: Battery And Fuse Replacement

    6. BATTERY AND FUSE REPLACEMENT If the sign “ ” appears on the LCD display, it indicates that the battery should be replaced. Remove screws on the back cover and open the case. Replace the exhausted battery with a new one. Fuse rarely need replacement and blow almost always as a result of the operator’s error.
  • Page 31 °F=( ° ×1.8+32 ) HYS004695 A0...

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