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Cojali 50002002, User Manual

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JT2002

Auto Range Multimeter
User Manual

4

This Operating Manual covers information on safety and cautions. Please read the 

relevant information carefully and observe all the Warnings and Notes strictly.

⚠

 

Warning

To avoid electric shock or personal injury, read the “Safety Information” and 

“Rules for Safety Operation” carefully before using the Meter.”

Digital Multimeter (hereafter referred to as “the Meter”) is an auto ranging 

multimeter. The enclosure structure design adopted advanced 

“co-injection” technique in order to provide sufficient insulation.

The Meter can measure AC/DC Voltage and Current, Resistance, Diode, Continuity, 

Buzzer, Capacitance, Frequency, Temperature (°C or °F ). 

In addition to the conventional measuring functions, there is data hold, relative 

mode, peak measurement, low battery display, display backlight and sleep mode.

Overview

Summary of Contents for 50002002

Page 1: ...JT2002 Auto Range Multimeter User Manual ...

Page 2: ...9 The Meter Structure 10 Rotary Switch 11 Functional Buttons 12 Display Symbols 13 Measurement Operation 15 A DC AC Voltage Measurement 15 B DC AC Current Measurement 18 C Measuring Resistance 21 D Testing for Continuity 24 E Testing Diodes 26 F Capacitance Measurement 29 G Frequency Measurement 32 H Temperature Measurement 34 Operation of Hold Mode 36 RANGE Button 36 MAX MIN Button 36 ...

Page 3: ...acklight 38 Sleep Mode 38 General Specifications 39 Accuracy Specifications 40 A DC Voltage 41 B AC Voltage 42 C DC Current 43 D AC Current 44 E Resistance 45 F Capacitance 46 G Frequency 47 H Diode Test 48 I Continuity Test 48 J Temperature 49 Maintenance 50 A General Service 50 B Replacing the Battery 51 C Replacing the Fuses 53 ...

Page 4: ...refully before using the Meter Digital Multimeter hereafter referred to as the Meter is an auto ranging multimeter The enclosure structure design adopted advanced co injection technique in order to provide sufficient insulation The Meter can measure AC DC Voltage and Current Resistance Diode Continuity Buzzer Capacitance Frequency Temperature C or F In addition to the conventional measuring functi...

Page 5: ... damaged part In the event you find any of them missing or damaged please contact your supplier immediately Unpacking Inspection Item Description Qty 1 Operating Manual 1 piece 2 Test Lead 1 pair 3 Point Contact K type Temperature Probe 1 piece 4 Multi Purpose Socket 1 piece 5 9V Battery NEDA1604 6F22 or 0006P installed inside the Meter 1 piece ...

Page 6: ...imary supply level overhead lines cable systems etc Use the Meter only as specified in this operating manual otherwise the protection provided by the Meter may be impaired In this manual a Warning identifies conditions and actions that pose hazards to the user or may damage the Meter or the equipment under test A Note identifies the information that user should pay attention on International elect...

Page 7: ...for damaged insulation or exposed metal Check the test leads for continuity Replace damaged test leads with identical model number or electrical specifications before using the Meter Do not apply more than the rated voltage as marked on the Meter between the terminals or between any terminal and grounding The rotary switch should be placed in the right position and no changeover of range shall be ...

Page 8: ... diodes Before measuring current check the Meterís fuses and turn off the current to be tested before connecting the Meter to the circuit After connecting the circuit reliably turn the current to be tested on Replace the battery as soon as the battery indicator appears With a low battery the Meter might produce false readings that can lead to electric shock and personal injury When servicing the M...

Page 9: ...ble for indoor use Turn the Meter off when it is not in use and take out the battery when not using it for a long time Constantly check the battery as it may leak when it has not been used for some time replace the battery as soon as leaking appears A leaking battery will damage the Meter International Electrical Symbols AC or DC Grounding Double Insulated Deficiency of Built In Battery Warning Re...

Page 10: ...JT2002 Auto Range Multimeter User Manual 10 LCD Display Functional Buttons Blue button Rotary Switch Input Terminal The Meter Structure see figure 1 figure 1 1 2 4 5 3 ...

Page 11: ...positions Rotary Switch AC and DC Voltage Measurement Resistance Measurement Diode Test Continuity test Capacitance Test Hz Frequency and Duty Cycle Test ºC Temperature in Celsius ºF Temperature in Fahrenheit µA DCA and ACA Measurement mA DCmA and ACmA Measurement 10A 10A DC and AC Measurement OFF Power off ...

Page 12: ...off Hold Press to enter or exit data hold mode BLUE Button Press to select the alternate feature RANGE Press RANGE to enter the manual ranging mode the Meter beeps Press RANGE to step through the ranges available for the selected function the Meter beeps Press and hold RANGE for 2 seconds to return to autoranging the Meter beeps MAX MIN Press to select the maximum and minimum value REL Press to en...

Page 13: ... in which the Meter automatically selects the range with the best resolution 7 Indicator for manual ranging mode 8 The input value is too large for the selected range 9 Test of diode 10 The continuity buzzer is on 11 Maximum and Minimum reading 12 Data output is in progress 13 The battery is low Warning To avoid false readings which could lead to possible electric shock or personal injury replace ...

Page 14: ... x 10 3 or 0 001 volts μA mA A A Amperes amps The unit of current mA Milliamp 1 x 10 3 or 0 001 amperes μA Microamp 1x 10 6 or 0 000001 amperes nF μF mF F Farad The unit of capacitance μF Microfarad 1 x 10 6 or 0 000001 farads nF Nanofarad 1 x 10 9 or 0 000000001 farads ºC ºF ºC Centigrade The unit of temperature ºF Fahrenheit The unit of temperature Hz kHz MHz Hz Hertz The unit of frequency in cy...

Page 15: ...JT2002 Auto Range Multimeter User Manual 15 A DC AC Voltage Measurement See figure 2 Measurement Operation figure 2 Select ...

Page 16: ...Insert the red test lead into the V terminal and the black test lead into the COM terminal 2 Set the rotary switch to V DC measurement is set by default or press BLUE button to switch between DC and AC measurement mode 3 Connect the test leads across two points of the object being measured The measured value is shown on the display Display effective value of sine wave mean value response Input Amp...

Page 17: ... loading effect can cause measurement errors in high impedance circuits If the circuit impedance is less than or equal to 10kΩ the error is negligible 0 1 or less When voltage measurement has been completed disconnect the connection between the testing leads and the circuit under test and remove the testing leads away from the input terminals of the Meter ...

Page 18: ...JT2002 Auto Range Multimeter User Manual 18 B DC AC Current Measurement See figure 3 figure 3 Select ...

Page 19: ...ted to the current terminals they should not be in parallel across the circuit To measure current do the following 1 Insert the red test lead into the mA or A input terminal and the black test lead into the COM terminal 2 Set the rotary switch to μA mA or A 3 The Meter defaults to DC current measurement mode To toggle between DC and AC current measurement function press BLUE button 4 Connect the t...

Page 20: ...ximum measurement position and reduce the range step by step until a satisfactory reading is obtained For safety sake each measurement time for 5A current should be less than 10 seconds and the interval time between 2 measurements should be greater than 15 minutes When current measurement has been completed disconnect the connection between the testing leads and the circuit under test and remove t...

Page 21: ...JT2002 Auto Range Multimeter User Manual 21 C Measuring Resistance See figure 4 figure 4 Select ...

Page 22: ...ance connect the Meter as follows 1 Insert the red test lead into the mA or A input terminal and the black test lead into the COM terminal 2 Set the rotary switch to Ω resistance measurement Ω is set by default or press BLUE button to select Ω measurement mode 3 Connect the test leads across two points of the object being measured If there is lead on the resistor or SMT resistor it is more conveni...

Page 23: ...ot 0 5Ω check for loose test leads or other reasons For high resistance measurement 1 MΩ it is normal to take several seconds to obtain a stable reading To obtain stable reading use a test lead as short as possible or use the included multi purpose socket to carry out measurement The LCD displays OL indicating open circuit for the tested resistor or that the resistor value is higher than the maxim...

Page 24: ...JT2002 Auto Range Multimeter User Manual 24 D Testing for Continuity See figure 5 figure 5 Select ...

Page 25: ...ow 1 Insert the red test lead into the Ω terminal and the black test lead into the COM terminal 2 Set the rotary switch to and press BLUE button to select measurement mode 3 The buzzer sounds continuously if the resistor to be tested is 10Ω The buzzer does not sound if the resistor to be tested is 35Ω Note Open circuit voltage is around 0 45V When continuity testing has been completed disconnect t...

Page 26: ...JT2002 Auto Range Multimeter User Manual 26 E Testing Diodes See figure 6 Select figure 6 ...

Page 27: ...f do not input higher than DC 60V or AC 30V voltages 1 Insert the red test lead into the Ω terminal and the black test lead into the COM terminal 2 Set the rotary switch to and press BLUE button to select measurement mode 3 For forward voltage drop readings on any semiconductor component place the red test lead on the component s anode and place the black test lead on the component s cathode The m...

Page 28: ...be tips Connect the test leads to the proper terminals as said above to avoid an error on display The LCD will display OL indicating diode being tested is open or polarity is reversed The unit of diode is Volt V displaying the forward voltage drop readings When diode testing has been completed disconnect the connection between the testing leads and the circuit under test and remove the testing lea...

Page 29: ...JT2002 Auto Range Multimeter User Manual 29 F Capacitance Measurement See figure 7 figure 7 Select ...

Page 30: ...t nF measurement mode At that time the Meter will display a fixed value as below which is the Meter internal fixed distributed capacitance value To ensure accuracy when measuring a small value of capacitance the tested value must subtract this value REL mode can help on that Around 10nF For more convenience use the included multi purpose socket for measuring capacitor with leads or SMT capacitor I...

Page 31: ...e when the tested capacitor is more than 100uF The LCD displays OL indicating the tested capacitor is shorted or it exceeds the maximum range When capacitance measurement has been completed disconnect all the connection between multi purpose socket capacitor and the Meter ...

Page 32: ...JT2002 Auto Range Multimeter User Manual 32 G Frequency Measurement See figure 8 figure 8 Select ...

Page 33: ...nt Hz is set by default or press Hz button to select Hz measurement mode 3 Connect the test leads across two points of the object being measured The measured value shows on the display 4 If you need to measure duty cycle press Hz button to select measurement mode Note Input Amplitude DC electric level is zero When 10Hz 10MHz 200mV a 30Vrms When frequency measurement has been completed disconnect t...

Page 34: ...T2002 Auto Range Multimeter User Manual 34 H Temperature Measurement See figure 9 The included K type point contact temperature probe can only be used in the measurement below 230 C figure 9 Select ºC ºF ...

Page 35: ... temperature probe to the object being measured After a few seconds the measured value will be shown on the display 4 Press BLUE button to toggle between ºC and ºF temperature Note To avoid measurement error especially low temperature measurement the operating temperature must not exceed 18 28 ºC When temperature measurement has been completed disconnect the connection between the temperature prob...

Page 36: ...isplayed RANGE button Press RANGE to enter the manual ranging mode the Meter beeps Press RANGE to step through the ranges available for the selected function the Meter beeps Press and hold RANGE for over 2 seconds to return to autoranging the Meter beeps MAX MIN button Press MAX MIN to start recording of maximum and minimum values Steps the display through high MAX and low MIN readings The Meter e...

Page 37: ...value is 22 0V the reading would be 2 0V If a new measurement value is equal to the stored value then it will display 0 0V To enter or exit REL mode Press REL to enter REL mode and the present measurement range is locked and displays 0 as the stored value Press REL again to reset the stored value and exit REL mode It uses for selecting the required measurement function when there is more than one ...

Page 38: ...urn the Display Backlight on The display backlight will automatically off around after 10 seconds To preserve battery life the Meter automatically turns off if you do not turn the rotary switch or press any button for around 15 minutes The Meter can be activated by turning the rotary switch or pressing any button To disable the Sleep Mode function press BLUE button while turning on the Meter Turni...

Page 39: ...n voltage Fused Protection for µAmA Input Terminal 600mA H 1000V φ6 35 x 31 8mm Fused Protection for 10A Input Terminal 10A H 1000V φ10 3 x 38 1mm Display Maximum reading 6000 frequency 9999 analogue bar graph 61 segments Measurement Speed Updates 2 3 times second Range Auto or Manual Polarity Display Auto Overload indication Display OL Battery Deficiency Display ...

Page 40: ...Frequency electromagnetic Field phenomenon the captioned model have a measurement error it will be back to normal when the interference is removed Dimensions HxWxL 180x87x47mm Weight Approximate 370g battery included Safety Compliances EN 61010 1 EN 61010 2 030 CAT III 1000V CAT IV 6000V overvoltage and double insulation standard Certifications Accuracy a reading b digits guarantee for 1 year Oper...

Page 41: ...ltimeter User Manual 41 A DC Voltage Range Resolution Accuracy Imput Impedance Fixed Value Imput 60mV 0 01mV 0 8 3 Around 3000MΩ 1000V dc ac 600mV 0 1mV 0 8 3 6V 0 001V 0 5 1 Around 10MΩ 60V 0 01V 600V 0 1V 1000V 1V 1 0 3 ...

Page 42: ...lution Accuracy Imput Impedance Fixed Value Imput 45 1kHz 60mV 0 01mV 1 2 5 Around 3000MΩ 1000V dc ac 600mV 0 1mV 6V 0 001V 0 5 1 Around 10MΩ 60V 0 01V 600V 0 1V 1000V 1V 1 2 5 Displays effective value of sine wave mV range is applicable from 5 of range to 100 of range ...

Page 43: ... 0 1µA 1 0 3 Fuse1 F600mA H 1000V Φ6 35 x 31 8mm 6000µA 1µA 60mA 0 01mA 600mA 0 1mA 6A 0 001A 1 2 5 Fuse2 F10A H 1000V Φ10 3 x 38 1mm 10A 0 01A Remarks When 5A Continuous measurement is allowed When 5A Continuous measurement of less than 10 seconds with an interval of at least 15 minutes between measurements ...

Page 44: ... F600mA H 1000V Φ6 35 x 31 8mm 6000µA 1µA 60mA 0 01mA 1 5 5 600mA 0 1mA 6A 0 001A 2 0 5 Fuse2 F10A H 1000V Φ10 3 x 38 1mm 10A 0 01A Remarks When 5A Continuous measurement is allowed When 5A Continuous measurement of less than 10 seconds with an interval of at least 15 minutes between measurements Displays effective value of sine wave ...

Page 45: ... 45 Range Resolution Accuracy Overload Protection 600Ω 0 1Ω 1 2 2 1000V dc ac 6kΩ 0 001kΩ 1 0 2 60kΩ 0 01kΩ 600kΩ 0 1kΩ 6MΩ 0 001MΩ 1 2 2 60MΩ 0 01MΩ 1 5 2 Remark When measuring below 2kΩ apply REL to ensure measurement accuracy E Resistance ...

Page 46: ...l 46 Range Resolution Accuracy Overload Protection 40nF 0 01nF 3 0 5 1000V dc ac 400nF 0 1nF 4µF 0 001µF 40µF 0 01µF 400µF 0 1µF 4 0 5 4000µF 1µF unspecified Remark There is around 10nF residual reading when the circuit is open F Capacitance ...

Page 47: ...1000V dc ac G Frequency Input Amplitude DC electric level is zero When 10Hz 10MHz 200mV a 30Vrms When measuring on line frequency or duty cycle under AC Voltage and Current measurement mode the input amplitude and frequency response must satisfy the following requirement Input amplitude range x 30 Frequency response 1 kHz ...

Page 48: ...n circuit voltage around 2 8V 1000V dc ac Resolution Overload Protection 0 1Ω 1000V dc ac H Diode Test I Continuity Test Open circuit voltage is around 0 45V Broken circuit resistance value is around 35Ω the buzzer does not beep Good circuit resistance value is 10Ω the buzzer beeps continuously ...

Page 49: ... ºC 1ºC 40ºC 20ºC 8 5 1000V dc ac 20ºC 0ºC 1 2 4 0ºC 100ºC 1 2 3 100ºC 1000ºC 2 5 2 ºF 1ºF 40ºF 4ºF 8 6 4ºF 32ºF 1 2 5 32ºF 212ºF 1 2 4 212ºF 1832ºF 2 5 3 Thermocouple It is suitable to use K type thermocouple The included point contact K type thermocouple can only be used on less than 230ºC temperature measurement ...

Page 50: ...nformation To avoid electrical shock or damage to the Meter do not get water inside the case Periodically wipe the case with a damp cloth and mild detergent Do not use abrasives or solvents To clean the terminals with cotton bar with detergent as dirt or moisture in the terminals can affect readings Turn off the power of the Meter when it is not in use Take out the battery when it has been used fo...

Page 51: ...JT2002 Auto Range Multimeter User Manual 51 B Replacing the Battery figure 10 ...

Page 52: ...tested before opening the case bottom To replace the battery see figure 10 1 Turn the Meter power off and remove all connections from the terminals 2 Remove the screw from the tilt stand and the battery compartment and separate the battery compartment and the tilt stand from the case bottom 3 Remove the battery from the battery compartment 4 Replace the battery with a new 9V battery 5 Rejoin the t...

Page 53: ...JT2002 Auto Range Multimeter User Manual 53 C Replacing the Fuses figure 11 Select OL OK OK ...

Page 54: ...parate the battery compartment and the tilt stand from the case bottom 3 Remove the two screws from the case bottom and separate the case top from the case bottom 4 Remove the fuse by gently prying one end loose then take out the fuse from its bracket 5 Install ONLY replacement fuses with the identical type and specification as follows and make sure the fuse is fixed firmly in the bracket µA mA ra...

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