Datasheet 1.17 MB
Contents
1. Overload protection 250V DC or AC RMS Diode Function Measuring range Resolution Test Environment Diode Test gt t Forward DC current about 1mA Reverse DC voltage 2V 0 001V about 2 5V Display approximation of diode forward voltage drop Overload protection 250V DC or AC RMS Continuity measurement be tested is less th about 60Q Function Description Test Environment on When built in buzzer Open circuit sounds the resistance to voltage about an 2 5V Overload protection 250V DC or AC RMS Direct Current ME Resolution Accuracy range 20mA 0 01mA f 200mA 0 1mA 1 0 of reading 5 digits 10A 10mA 2 0 of reading 10 digits Overload protection grade mA Fuse F200mA 600V protection grade 10A Fuse F10A 500V protection 14 Maximum input current grade mA 200mA DC or AC RMS grade 10A 10A DC or AC RMS When measured current is greater than 2A the continuous measurement time cannot be not more than 2 minutes Disconnect the current and wait 10 minutes before making another measurement Battery test Measuring Resolution Built in load resistance range 12V 0 01V 3000 9V 0 01V 1 8kQ 1 5V 0 001V 360 Overload protection Fuse F200mA 500V protection Maintenance This section provides basic maintenance information including instructions for the replacement of2. Battery low voltage indicator Data hold indicator Numerical value display Numerical value polarity indicator negative sign Measuring operation Data hold The data hold function can keep the current readings on the display To enter and exit reading maintenance mode Press HOLD key the reading will be stored and symbol will display on the LCD display Press the HOLD key again to return the meter to the normal measurement state AC DC voltage measurement Rotate the function selection switch to appropriate AC or DC voltage measurement position 2 Connect the black and red test probes to the COM input jack and VOmA input jack respectively 3 Measure the voltage of circuit to be tested with other ends of test probes connected with the circuit to be tested in parallel 0 Read the measured value from the LCD display When measuring the DC voltage the display will simultaneously show the voltage polarity which is connected with the red test probe Warning Don t measure any RMS voltage higher than 600V DC or AC to prevent injury or damage to meter and equipment DC current measurement 0 Turn off the power to the circuit to be tested Discharge all the high voltage capacitors on the circuit to be tested Rotate the function selection switch to the appropriate DC current position 3 Depending on the size of the current to be measured connect the red test
3. the battery cover with screwdriver 16 39096 Remove the battery cover Remove old batteries Replace with two new AAA batteries placing the positive and negative ends in their correct positions Replace the battery cover and tighten the screws Replace fuse A Warning To avoid electric shock or personal injury before opening back cover to replace fuse turn off the meter and disconnect the test probe from the measurement circuit To replace fuse 3506066080 Turn off the power to the meter Remove all test probes from the input jacks Loosen screws on the back cover with screwdriver Remove the back cover Remove the blown fuse Replace with new fuse with the same type Put the back cover and tighten the screws 17 Dongguan Huayi Mastech Co Ltd Shenzhen Huayi Mastech Co Ltd Address West Floor 9 Block 3 SEG Science amp Technology Industrial Park Huaqiang North Road Shenzhen Sales Tel 0755 83766670 After sale service 0755 83766634 Fax 0755 83766510 E mail infoOmastech cn Website http www mastech cn Post Code 518028
4. fuse and battery Do not try to repair the meter unless you are an experienced maintenance person with the relevant calibration performance testing and maintenance data General maintenance Warning To avoid injury or damage to the meter don t wet the inner parts of the meter Before opening the case or battery cover remove the connecting cable between the test probe and the input signal 15 Regularly clean the meter case with damp cloth and a small amount of detergent Do not use abrasives or chemical solvents If the input jack becomes dirty or wet it may affect the measurement readings To clean input socket Turn off the meter and pull out all the test probes from the input jack 2 Remove all dirt from the jacks 3 Apply detergent or lubricant to a new cotton ball such as WD 40 0 Clean each jack with a cotton ball and lubricant to prevent contamination by moisture in the socket Replace battery Warning To avoid incorrect readings and possible electric shock or personal injury when E appears on the meter display replace the battery immediately To avoid electric shock or personal injury before opening the battery cover to replace battery turn off the meter and make sure that the test probe is disconnected from the measurement circuit Please follow these steps to replace battery Turn off the power to the meter 2 Remove all test probes from the input jacks 3 Loosen screws
5. MASTECHo MS8239A Digital Multimeter User s Manual Table of Contents 1 Safety 18 1 Safe working 18 1 Electric 5 2 2 4 Meter instructions is nase ae 5 Meter appearance i ic s cei sie 5 Displa rara ea 6 Measuring 2 7 Data hold ia 7 DC AC voltage 7 DC current 8 Resistance 9 Continuity 10 Diode testar rca 10 Battery testimonial tinas 11 General 2 12 Accuracy 2 2 13 DC Volta Qe ii iia 13 AC VONAGE 13 Resistance 14 DIS ae 14 DC CUIT dui 15 Battery testi ir sde 15 Maintenance 16 General 16 Replace battery 17 Replace fuse ia dido 17 Overview Warning To avoid electric shock or personal injury plea
6. c parts Please pay special attention to the joint insulating layer O Check to see if the test wire has insulation damage or bare metal Check test wire continuity If the wire is damaged please replace it with a new one before using the meter Measure known voltage with the meter to verify that the meter is working properly If the meter is working abnormally stop using it immediately A protective device may be damaged If there is any doubt please have the meter inspected by a qualified technician Do not test voltage exceeding rated voltage marked on the meter When testing voltage exceeding 30v AC voltage RMS 42v AC peak or 60v DC be particularly careful to avoid electric shock e When measuring use correct jack and select the proper function and measuring range Do not use the meter in explosive gas vapor or dusty environments When using the probe fingers should be behind the probe protection device When connecting circuits connect the common test line first then connect the charged test line When disconnecting circuits disconnect the charged test line first then disconnect the common test line Before measuring resistance continuity and diodes first turn off power and discharge all high voltage capacitors 2 If the meter is not used in accordance with the instructions the meter s safety protective function may become invalid For all DC measurements to avoid the risk of electric shock pl
7. ease use AC function to verify the existence of any AC voltage Then select DC voltage measuring range equal to or greater than the AC measuring range Before measuring current please check the meter fuse shut off power to the circuit to be tested then connect the meter and energize the circuit When opening the case or part of the case turn the meter off When the battery low voltage indicator becomes lit replace the battery at once Alow battery will cause meter reading errors and may result in electric shock or personal injury Before opening the case or the battery cover remove the test wire from the meter When maintaining the meter use replacement parts specified by the factory Electric symbols A Sea Important safety information AC Alternating Current DC Direct Current AC or DC Ground wire Double insulation protection Fuse Accord with the related EU laws and regulations Meter instructions Meter appearance 990 9 LCD display Data hold key Function selection rotary switch Positive input jack of 10A connected with the red test probe All the common input jacks for measuring connected with the black test probe Positive input jack of voltage resistance mA current diode continuity and battery test connected with the red test probe Display 9090 000 4
8. ed on a circuit is usually different from the rated value of resistance This is because the test current of the meter will flow through all the possible channels between the test probes When measuring low resistance to ensure the accuracy of the measurement make a short circuit between the test probes and read the resistance value of the short circuit This resistance value should be subtracted after measuring the resistance to be tested When there is no input for example open circuit the display will show 1 which means that the measured value is out of range Warning When measuring resistance or circuit continuity to avoid injury or meter damage turn off the power to the circuit and discharge all capacitors Continuity measurement Rotate the function selection switch to continuity measurement position and turn off the power to the circuit to be tested Connect the black and red test probe to COM input jack and VOmA input jack respectively Measure the circuit to be tested with other two ends of the test probes If the measured circuit resistance is less than about 500 the buzzer will sound continuously Warning When measuring resistance or circuit continuity to avoid injury or meter damage turn off the power to the circuit and discharge all capacitors Diode Test Rotate the function selection switch to diode position and turn off the power to t
9. end and ground 600V DC or 600V AC RMS Fuse protection grade mA fuse F200mA S00V grade 10 fuse 104 500 Sampling rate about 3 times s Display 3 5 digital LCD display Over range indication LCD will show 1 Low battery indication When the battery voltage is lower than the normal operating voltage will display on the LCD display Input polarity indication automatically display Power supply AAA 1 5V batteries C Accuracy indicators Accuracy of reading digits with one year of warranty Reference conditions environmental temperature is from 18 C 28 C relative humidity is not more than 80 12 DC voltage Measuring Resolution Accuracy range 200mV 0 1mV ow oy 0 5 of reading 3 digits 200V 0 1V 600V 1V 0 8 of reading 3 digits Input impedance Maximum input voltage 600V DC or AC RMS 250V DC or AC RMS with the measuring range of 200mV AC voltage Measuring Resolution Accuracy range 200V 0 1V 1 2 of reading 10 600V 1V digits Input impedance 1MQ Maximum input voltage 600V DC or AC RMS 250V DC or AC RMS with the measuring range of 200mV Frequency response 40Hz 400Hz sine wave RMS average response Resistance Measuring Resolution Accuracy range 2000 0 10 2kQ 0 001kQ 20kQ 0 01kQ 0 8 of reading 5 digits 200kQ 0 1kQ 2MQ 0 001MQ 13
10. he circuit to be tested 2 Connect the black and red test probe to COM input jack and VOmA input jack respectively 3 Connect the black and red test probe to cathode and anode of the diode to be tested respectively The meter will display the diode s forward bias voltage value If the test probe polarity is reversed the meter will display 1 which distinguishes the diode s cathode and anode 10 Warning When measuring diodes to avoid injury or meter damage turn off the power to the circuit and discharge all capacitors Battery test Place the function measuring range switch to the battery testing position 9 Insert the red probe to VOmA input jack Insert the black probe to COM input jack 3 Connect free end of the red probe to positive and the free end of the black probe to negative end of the battery to be tested Read the result from the LCD display Warning Don t input voltage higher than 60V DC or 30V AC to prevent electric shock or meter damage General specifications Operating environment and condition 600V CAT pollution grade Elevation lt 2000 m 11 Environmental temperature and humidity 0 40 C lt 80 RH do not use meter when temperature lt 10 C Storage temperature and humidity 10 60 C and lt 70 RH remove the battery Temperature coefficient 0 1x Accuracy C lt 18 C or gt 28 C The maximum allowable voltage between measurement
11. probe to 10A or mA input jack connect the black test probe to COM input jack 7 Turn off the circuit to be tested Connect the black test probe to one end of the disconnected circuit low voltage relatively and the red test probe is connected to the other end of disconnected circuit high voltage relatively Reversing test probes would make reading become negative but the meter won t be damaged Connect the power supply to the circuit then read the display reading If the display shows only 1 the input is out of the selected input range In this case rotate the switch to a higher measuring range Warning To prevent injury or damage to meter and equipment do not make current measurements if voltage exceeds 250V Note Before measuring current first check the meter s fuse When measuring use correct input end and function When the test probe is inserted to the current input end don t connect the other end of the test probe with any circuit in parallel 8 Resistance measurement 0 Rotate the function selection switch to an appropriate resistance position and turn off the power to the circuit to be tested 2 Connect the black and red test probe to COM input jack and VOmA input jack respectively 9 Measure the resistance of the circuit with other ends of test probes Read the resistance value from the LCD display Here are some tips for measuring resistance The resistance measur
12. se read safety information and warning and related notes carefully before using the meter The MS8239A is a small hand held safe and reliable 3 5 digital multimeter with stable performance and novel structure It can be used to measure DC voltage DC current resistance diode forward voltage drop circuit continuity and to test batteries It is an ideal maintenance tool easily carried by a large number of users Safety instructions The MS8239A digital multimeter has been designed according to International Electro Safety Standard 1010 61010 1 IEC 2001 concerning safety requirements for electronic measuring instruments and hand held digital multimeters It meets the requirements for CAT M 600V of IEC1010 and grade 2 for pollution e Users should use the meter strictly according to the provisions of this manual Otherwise the warranty for the meter may become invalid e The warnings in the user manual are used to remind users of possible dangers or dangerous actions The notes in the user manual are to remind users of conditions or actions that may cause damage to the measured object Safe working habits To avoid possible electric shock or personal injury as well as damage to the meter or measured objects please use the meter according to the following procedures 1 O Check the case before using the meter Don t use the meter with damaged case Check to see if the case is cracked or lacks plasti
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