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MASTECH

®

MS8239B

DIGITAL MULTIMETER

USER’S MANUAL

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Summary of Contents for MS8239B

Page 1: ...MASTECH MS8239B DIGITAL MULTIMETER USER S MANUAL ...

Page 2: ...ssories 4 Certification 7 INTRODUCTION 7 Overview 7 Figures and Components 7 Buttons and Components 8 Display Description 10 USING THE METER 11 Preparation 11 DC AC Voltage Measurement 12 AC DC Current Measurement 13 Resistance Measurement 15 Diode 16 Continuity 16 1 5V 9V and 12V Battery Test 17 ...

Page 3: ...2 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: ...nditions of operation or handling Resellers are not authorized to extend any other warranty on MASTECH s behalf To obtain service during the warranty period contact your nearest MASTECH authorized service center to obtain return authorization information and then send the product to that Service Center with a description of the problem Out of the Box Check the Meter and accessories thoroughly befo...

Page 5: ...ECTRICAL 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 WARNING TO ENSURE SAFE OPERATION AND LIFE OF THE METER DO NOT PLACE THE METER IN ANY ENVIRONMENT WITH HIGH PRESSURE HIGH TEMPERATURE DUST EXPLOSIVE GAS OR VAPOR ...

Page 6: ...direct exposure to sunlight to ensure extended life of the Meter Do not place Meter in a strong magnetic field this may cause false readings Use only the batteries indicated in the Technical Spec Avoid exposing batteries to humidity Replace batteries as soon as the low battery indicator appears Please keep the original packing for future shipping purposes ex Calibration After opening the box check...

Page 7: ...ety Information Never use the Meter to measure voltages that might exceed 600V DC AC above earth ground Always be careful when working with voltages above 60V DC or 30V AC RMS Keep fingers behind the probe barriers while measuring Never connect the Meter leads across a voltage source while the rotary switch is in the resistance diode or continuity mode Doing so can damage the Meter Do not perform ...

Page 8: ...EC61010 1 standard with an overvoltage category 600V CAT III and pollution degree 2 The Meter is compiled to EMC requirements 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 entr...

Page 9: ...8 Figures and Components Buttons and Components 1 LCD liquid crystal display 2 HOLD Button 3 Rotary Switch 4 10A Input Jack 5 COM Input Jack 6 mA V Ω Input Jack ...

Page 10: ...9 Front Panel 6 5 4 3 2 1 ...

Page 11: ...10 Display Description 1 Low Battery Indicator 2 Hold 3 Reading Display 4 Polarity ...

Page 12: ...d shows that the input voltage or current should not exceed the specified value in order to protect the internal circuit from damage Turn the rotary switch to the required function and range to be measured Choose the highest range when the value to be measured is unknown When making connection connect the common test lead first and then the powered test lead Removed the charged test lead first whe...

Page 13: ... TO AVOID ELECTRICAL SHOCK AND INJURY DO NOT TEST VOLTAGES HIGHER THAN DC AC 600V Plug the black test lead into COM jack and the red test lead into V jack Set the rotary switch to V AC or V DC position in the corresponding range Connect the test leads to the voltage source or load for measurement Read the result on the LCD The polarity symbol denotes the polarity of the end connected by the red te...

Page 14: ...ding will be shown o Under any range mode when 1 is shown on the LCD it means the measurement has exceeded the allowable range A higher range should be selected o When the value to be measured is unknown select the highest range first and lower the range accordingly AC DC Current Measurement WARNING USE CAUTION WHEN MEASUREING HIGH VOLTAGE CIRCUITS TO AVOID ELECTRICAL SHOCK AND INJURY DO NOT TEST ...

Page 15: ...10A jack and turn the switch to 10A Connect the test leads to the circuit Read the result on the display The polarity symbol denotes the polarity of the red test lead NOTE o Under any range mode when 1 is shown on the LCD it means the measurement has exceeded the allowable range a higher range should be selected o When the value to be measured is unknown select the highest range first and then low...

Page 16: ...rotary switch to the Ω position with corresponding range Connect the test leads to the ends of the resistor or circuit Read the numbers on the LCD NOTE Under any range mode when only 1 is shown on the LCD it means the measurement has exceeded the range and a higher range should be selected When the input is open 1 is displayed on the LCD to indicate overload For measuring resistance above 1MΩ it m...

Page 17: ... the cathode of the diode for testing Read the result on the LCD NOTE o The Meter will show approximate forward voltage drop of the diode o When the test leads are reversed or opened 1 will appear on the LCD Continuity WARNING TO AVOID ELECTRICAL SHOCK AND INJURY POWER OFF THE CIRCUIT AND DISCHARGE THE CAPACITANCE BEFORE MEASURING CONTINUITY Plug the black test lead into the COM jack and the red t...

Page 18: ...is less than 50Ωthe built in buzzer will sound 1 5V 9V and 12V Battery Test To check if the battery is in good or bad condition switch the rotary switch to BATT and choose the voltage according to the battery type Connect the red lead to the side of battery and black lead to the side Read off the result from the display ...

Page 19: ...olarity indication automatic for negative polarity Overload indication 1 Sampling time approx 3 times second Function and Unit display Fuse protection 1 F200mA 250V Fuse protection 2 FF10A 600V Power Supply 1 5V 2 AAA batteries Battery low indication on LCD Operating Temperature 0 C to 40 C 32 F to 104 F Storage Temperature 10 C to 60 C 10 F to 140 F Dimension 147 76 2 41mm 5 8 x 3 x 1 6 in ...

Page 20: ... 1mV 20V 10mV 200V 100mV 600V 1V 0 8 of reading 3 digits Input Impedance 1MΩ Maximum input voltage 600V DC or AC RMS NOTE o At small voltages range unsteady readings will appear before the test leads make contact with the circuit This is normal since the meter is highly sensitive When the test leads connect to the circuit the true reading will be shown ...

Page 21: ...ponse 40Hz 400Hz sine wave RMS Average response NOTE o At small voltage ranges unsteady readings will appear before the test leads make contact with the circuit This is normal since the meter is highly sensitive When the test leads connect to the circuit the true reading will be shown AC Current Range Resolution Accuracy 200mA 0 1mA 1 2 of reading 5 digits ...

Page 22: ... 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 Disconnect the current and wait 10 minutes before making another measurement DC Current Range Resolution Accuracy 200mA 100μA 1 0 of reading 5 digits 10A 10mA 2 0 of reading 10 digits Overload protection ...

Page 23: ...er than 2A continuous measurement time cannot be more than2 minutes Disconnect the current and wait 10 minutes before making another measurement Resistance Range Resolution Accuracy 200Ω 0 1Ω 0 8 of reading 5 digits 2kΩ 1Ω 20kΩ 10Ω 200kΩ 100Ω 2MΩ 1kΩ Open circuit voltage 0 25V Overload protection 250V DC or RMS AC Diode Test Max V Resolution Function ...

Page 24: ...tion Built in buzzer will sound if resistance is lower than 60Ω Overload Protection 250V DC or RMS AC Battery Test Measuring Range Resolution Built in Load Resistance 12V 0 01V 300Ω 9V 0 01V 1 8kΩ 1 5V 0 001V 36Ω Maintenance and Repair Repair Please follow these steps closely if the Meter is not functioning properly ...

Page 25: ...ncountered Remove batteries and pack Meter well to avoid damage in delivery Dawson does not cover damage due to delivery Repair or service not covered in this manual should be performed only by the authorized service center or qualified personnel Test Leads Replacement WARNING REPLACE THE TEST LEADS WITH IDENTICAL OR COMPATIBLE LEADS LEAD SPEC 1000V 10A Replace new leads if the current leads are w...

Page 26: ...or to the case bottom and tighten the screw Replacing Fuse Fuses rarely need replacement Almost all blows are the result of operation error Loosen the battery compartment door screws like in the Replace Batteries Remove the red rubber cover Remove the screws located in the back Replace the blown fuse with one at the specified rating Replace and tighten the screws located in the back Put back on th...

Page 27: ...26 Do not recycle ...

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