Mastech MS8239B User Manual
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Mastech MS8239B User Manual

Mastech MS8239B User Manual

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MASTECH
®
MS8239B
DIGITAL MULTIMETER
USER'S MANUAL

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  • Page 1 MASTECH ® MS8239B DIGITAL MULTIMETER USER’S MANUAL...

  • Page 2: Table Of Contents

    TABLE OF CONTENT LIMITED WARRANTY AND LIMITATION OF LIABILITY ....錯誤! 尚未定義書籤。 Out of the Box ..........3 Accessories ............. 4 Certification............ 7 INTRODUCTION ........... 7 Overview ............7 Figures and Components........ 7 Buttons and Components......8 Display Description ........10 USING THE METER ........
  • Page 3 SPECIFICATIONS ........18 General Specification ........18 Technical Specifications ....... 19 MAINTENANCE AND REPAIR ..... 23 Repair ............23 Test Leads Replacement ....... 24 Replacing Batteries ........25 Replacing Fuse ..........25...

  • Page 4: Limited Warranty And Limitation Of Liability

    LIMITED WARRANTY AND LIMITATION OF LIABILITY This MS8239B product from MASTECH will be free from defects in material and workmanship for one year from the date of purchase. This warranty does not cover fuses, disposable batteries, or damage from drops, neglect, misuse, alteration, contamination, or abnormal conditions of operation or handling.

  • Page 5: Accessories

    Accessories  Test Leads 1set  1.5V AAA Battery 2pcs  User’s Manual Safety Information WARNING TO REDUCE THE RISK OF FIRE, ELECTRICAL SHOCK, PRODUCT DAMAGE OR PERSONAL INJURY, PLEASE FOLLOW THE SAFETY INSTRUCTIONS DESCRIBED IN THE USER’S MANUAL. READ THE USER’S MANUAL BEFORE USING THE METER.
  • Page 6  Avoid shaking, dropping or any kind of impacts when using or transporting the Meter.  To avoid electric shock or personal injury, repairs or servicing not covered in this manual should be performed only by qualified personnel.  Avoid direct exposure to sunlight to ensure extended life of the Meter.
  • Page 7 Safety Symbols on the Meter Important safety information, please refers to the user manual Earth ground Indicates compliance with requirements for double insulation Possible of high voltage Fuse must be replaced with ratings specified in the manual. Important Safety Information ...

  • Page 8: Certification

    Introduction Overview The MS8239B is a compact and portable multifunction digital multimeter featuring an easy-to-read LCD screen. Basic functions include: AC/DC voltage, AC/DC current, resistance, diode, continuity measurements and battery test. This MS8239B is ideal for any entry level use.

  • Page 9: Figures And Components

    Figures and Components Buttons and Components LCD (liquid-crystal display) HOLD Button Rotary Switch 10A Input Jack COM Input Jack mA/V/Ω/ Input Jack...
  • Page 10 Front Panel...

  • Page 11: Display Description

    Display Description Low Battery Indicator Hold Reading Display Polarity...

  • Page 12: Using The Meter

    Using the Meter Preparation  Switch on the power by turning the rotary switch. If the battery voltage is lower than 2.8V, the“ ”symbol will appear and the batteries should be replaced.  The “ ” symbol next to the input lead shows that the input voltage or current should not exceed the specified value in order to protect the internal circuit from damage.

  • Page 13: Dc/Ac Voltage Measurement

    Readings Hold  Press “HOLD” button to hold the readings of current measurement.  Press “HOLD” button again to release the hold. DC/AC Voltage Measurement WARNING USE CAUTION WHEN MEASUREING HIGH VOLTAGE CIRCUITS TO AVOID ELECTRICAL SHOCK AND INJURY. DO NOT TEST VOLTAGES HIGHER THAN DC/AC 600V.

  • Page 14: Ac/Dc Current Measurement

    NOTE: At a small voltage range, unsteady readings will appear before the test leads makes contact with the circuit. This is normal since the Meter is highly sensitive. When the test leads are connected to the circuit, the true reading will be shown. Under any range mode, when ‘1.’...
  • Page 15  Plug the black test lead into the “COM” jack.  Set the rotary switch to “A~” (AC) or “A ” (DC) position in the corresponding range. For example, when the current to be measured is under 200mA, plug the red test lead into “mA” jack and turn the switch to “200mA”;...

  • Page 16: Resistance Measurement

    jack, current exceeding the limit will blow the fuse. Resistance Measurement WARNING TO AVOID ELECTRICAL SHOCK AND INJURY POWER OFF THE CIRCUIT AND DISCHARGE THE CAPACITANCE BEFORE MEASURING RESISTANCE.  Plug the black test lead into the “COM” jack and the red test lead into the “Ω” jack. ...

  • Page 17: Diode

    Diode  Plug the black test lead into the COM jack and the red test lead into the jack.  Set the rotary switch to the range position and select a proper range.  Connect the red test lead to the anode and the black test lead to the cathode of the diode for testing.

  • Page 18: 1.5V 9V And 12V Battery Test

     Set the rotary switch to the “ ” position.  Connect the test leads to two ends of the circuit. If resistance of the circuit is less than 50Ωthe built-in buzzer will sound. 1.5V 9V and 12V Battery Test ...

  • Page 19: Specifications

    Specifications General Specification  Maximum voltage between terminals and earth ground: 600V DC/AC  Operating altitude: max. 2000 meters (7000 ft.)  Display: 3.5’’ LCD  Maximum value of display: 1999  Polarity indication: automatic; ‘-‘for negative polarity.  Overload indication: ‘1.’ ...

  • Page 20: Technical Specifications

     Weight: approximate 230g (7.6oz) including batteries Technical Specifications DC Voltage Range Resolution Accuracy 200mV 0.1mV ± (0.5% of reading + 3 digits) 10mV 200V 100mV ± (0.8% of reading + 3 600V digits) Input Impedance: 1MΩ Maximum input voltage: 600V DC or AC RMS. NOTE: At small voltages range, unsteady readings will appear before the test leads make contact...
  • Page 21 AC Voltage Range Resolution Accuracy 200V 0.1V ± (1.2% of reading + 10 digits) 600V Input Impedance: 1MΩ Maximum input voltage: 600V DC or AC RMS. Frequency response: 40Hz~400Hz, sine wave RMS (Average response) NOTE: At small voltage ranges, unsteady readings will appear before the test leads make contact with the circuit.
  • Page 22 ±(2.5% of reading +10 10mA digits) Overload protection: mA: Fuse (F200mA/250V) 10A: Fuse (FF10A/600V) protection. Maximum input current: mA: 200mA DC or AC RMS 10A: 10A DC or AC RMS Frequency response: 40Hz~400Hz, sine wave RMS (Average response) NOTE: When measured current is greater than 2A, continuous measurement time cannot be more than2 minutes.
  • Page 23 mA: Fuse (F200mA/250V) 10A: Fuse (FF10A/600V) Maximum input current: mA: 200mA DC or AC RMS 10A: 10A DC or AC RMS NOTE: When measured current is greater than 2A, continuous measurement time cannot be more than2 minutes. Disconnect the current and wait 10 minutes before making another measurement.

  • Page 24: Maintenance And Repair

    Displaying approximate forward voltage of diode Overload Protection: 250V DC or RMS AC Continuity Test Function Built-in buzzer will sound if resistance is lower than 60Ω. Overload Protection: 250V DC or RMS AC Battery Test Measuring Resolution Built-in Load Range Resistance 0.01V 300Ω...

  • Page 25: Test Leads Replacement

     Check batteries; replace with new batteries if low battery indicator “ ” appears.  Follow User’s Manual to confirm all procedures.  Before sending Meter back for repair, include a description of the problems encountered. Remove batteries and pack Meter well to avoid damage in delivery, Dawson does not cover damage due to delivery.

  • Page 26: Replacing Batteries

    Replacing Batteries Follow these steps to replace batteries:  Turn off the Meter.  Loosen the battery compartment door screw, and remove the door from the case bottom.  Remove the batteries and replace the batteries with new batteries.  Reattach the battery compartment door to the case bottom and tighten the screw.
  • Page 27 Do not recycle...

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