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JT2003

Professional Multimeter
User Manual

6. Frequency/Duty Ratio Measurement

Range

Resolution power

Accuracy

100.00Hz ~ 40.00MHz

0.01Hz(0.1H) ~ 0.01mHz

(0.1%+4)

0.1% ~ 99.9%

0.1%

±(2%+5)

Overload protection: 1000V

Input amplitude (a): (DC level is zero)

≤ 100 kHz: 200mVrms ≤ a ≤ 30Vrms

> 100kHz ~ 1MHz: 600mVrms ≤ a ≤ 30Vrms

> 1MHz ~ 10MHz: 1Vrms ≤ a ≤ 30Vrms

> 10MHz: 1.8Vrms ≤ a ≤ 30Vrms

Duty ratio%: Only suitable for measurement less than 10kHz,

Input sensitivity is >2Vpp @ duty cycle= 10.0% & 95.0%)

Frequency ≤1 kHz Duty cycle 10.0%-95.0%

Frequency >1 kHz Duty cycle 30.0%-70.0%

Содержание Jaltest 50002003

Страница 1: ...JT2003 Professional Multimeter User Manual ...

Страница 2: ...no circumstances shall the Seller be responsible for the repairing carried out by staff not belonging to its organization If warranty service is required within warranty period please contact your nearest service center authorized by Cojali S L to obtain authorized information on return of the product then send the product together with the description of problems to that service center This warra...

Страница 3: ...4 III Accessories 5 IV Safe operation rules 6 V Electrical Symbols 9 VI Comprehensive Specifications 12 VII Overall Configuration 13 VIII Function Selection Button Definition and Double Mode Display 14 IX Measurement Operating Instruction 19 X Technical specifications 31 XI Maintenance and Repair 38 ...

Страница 4: ...meter is German GS certified 1 Completely sealed protection level is IP65 2 Withstand 2 meters fall 3 Dustproof complying with IEC60529 IP65 4 Waterproof complying with IEC60529 IP65 and IEC over voltage electrical safety standard 61010 1 2001 5 Large LCD dual mode display 6 000 counts dual slope analog to digital converter for conversion rate 5 times second 6 Full function measurement error prote...

Страница 5: ...13 LoZ voltage measurement which provides a low impedance to the conductor circuit to get more accurate measurement and detect ghost voltage 14 Capacitance range is 60 00mF 15 Capture MAX MIN mean and peak values and automatically record the transients and changes 16 Relative REL mode which eliminates the interference of test conductor in resistance measurement 17 Manual and auto select range that...

Страница 6: ... this manual with the instrument to all subsequent users 3 Safety Instructions and Precautions This instrument can be operated and maintained only by trained professionals To prevent electric shock when the operating voltage is more than 30Vrms DC or AC preventive measures should be taken The measuring instrument can only be used in line circuit of 20A its nominal voltage is 1000V CAT Ill For the ...

Страница 7: ...his instrument in a explosive environment Prior to use always inspect whether the instrument is in peak operating sequence or not Carry out measuring by connecting the instrument with a given power supply It is forbidden to use this instrument if the battery compartment is open Inspect the batteries before use or replacement The storage space should be kept dry In case of battery leakage do not us...

Страница 8: ...d in outdoor three phase utility power supply equipment that is initially connected such as power distribution system of power station over current protection device before the power instruments instruments of equipment connected with outdoor building The rated voltage for probe assembly used in main line measurement should comply with measurement category Ill and IV of IEC 61010 31 and the rated ...

Страница 9: ...f alcohol drugs and medicines It is not allowed to use this instrument in following conditions 1 Potential explosive environment This instrument is not explosion proof 2 In case of raining or other rainfall Risk of electric shock Double Insulation Grounding Warning Hint AC DC Symbol High Voltage Warning Symbol In compliance with the directive of European Union Tested and approved by TUV Product Se...

Страница 10: ...ion Nº Symbol Description 1 True RMS Function Measurement 5 PEAK Value Measurement 2 Data Hold 6 MAX MIN Measurement 3 High Voltage Warning 7 Diode Measurement and Circuit Continuity Measurement 4 Voltage measured by low pass filter intercept the voltage higher than 1 kHz 8 AC DC Measurement ...

Страница 11: ...quency Units Hertz Kilo Hertz Mega Hertz 13 Auto Range 24 Duty Ratio Measurement Unit 14 Relative Measurement 25 Auto Off 15 Positive Direction of Phase Sequence Rotary Measurement 26 8 8 8 8 8 Main Display Measurement Value 16 Reverse Direction of Phase Sequence Rotary Measurement 27 8 8 8 8 Secondary Sub Display Measurement Value 17 Phase Sequence Measurement Enabling State Identification symbol...

Страница 12: ...AUTO Polarity Automatic Operation Temperature 0ºC 40ºC 32 ºF 104ºF Storage Temperature 10ºC 50ºC 14ºF 122ºF Relative Humidity 0ºC 30ºC below is 75 30ºC 40ºC 50 7 Operation Altitude 0 2 000m 8 Batteries in the unit 6F22 9V 9 Low Battery LED displays or symbol 10 Overall Dimension About 195x95x58 mm 11 Weight About 473g including batteries 12 Electromagnetic Compatibility Under 1V m radio frequency ...

Страница 13: ...backlight sensing window 2 LCD display 3 Function button 4 Function selection switch 5 Measurement input terminals 6 Strap hook 7 Flashlight window 8 Multimeter probe locating stand 9 Battery cabinet fixing screw 10 Case support VII Overall Configuration ...

Страница 14: ... Voltage Measurement Circuit Continuity Measurement Capacitance Measurement Hz Frequency Measurement Duty Ratio Measurement AC DC Current Measurement LPF AC voltage Low Pass Filter Measurement LoZ On line AC Voltage Low Impedance Measurement MOTOR Three phase Motor Rotary Phase Sequence Voltage Phase Sequence Identification Measurement AC DC AC DC Measurement OFF Turn off the power 1 Feature Selec...

Страница 15: ...d mode Only suitable for REL Button Press to enter MANUAL range mode Take the current displayed value as reference the different value between measurement value and reference value will be displayed Press it again to exit relative measurement Only suitable for HOLD Button suitable for full range Press this button displayed value is locked and held LCD will display indicator Press it again the lock...

Страница 16: ...sine wave signal the recording function of the peak can measure the surge of the power supply much more accurately the transient value of surge SELECT Button Press to select function only suitable for combined range Long press SELECT button when powering on the meter Auto OFF function can be cancelled AC DC measurement In DCV mode short press SELECT button to enable AC DC mode Main display shows A...

Страница 17: ...ows frequency In ACV voltage mode long press SELECT button for more than 2 seconds to enable motor rotation direction function Main display shows the current voltage value and the secondary display shows operation frequency When resting Motor function short press SELECT button once to enable phase sequence measurement Long press SELECT button more than 2 seconds to exit Motor function Steps Phase ...

Страница 18: ... 2 3 or 3 2 1 if not move the probe to change input signal it will time out in 5 seconds Press SELECT button for at least 2 seconds to automatically exit phase sequence mode Press SELECT button for at least 2 seconds to exit Motor function a b c 5 PEAK Value Measurement Press PEAK button in ACV mode to enter peak measurement mode main display shows ACV value the secondary display shows P MAX Short...

Страница 19: ...less than 10kΩ the error can be ignored 0 1 or less 1 2 1 AC DC Voltage Measurement See Figure 1 Check the internal 6F22 9V batteries first if or symbol appear on the screen replace the batteries in time In addition attention should be paid to the symbol beside the probe sockets this is to warn you of not exceeding the indicated number for the measured voltage or current so as to guarantee the mea...

Страница 20: ...r measurement In ACV mode press SELECT button to enter LOW PASS FILTER this filter can intercept voltage higher than 1 kHz As shown in the following figure the low pass filter can measure the combined sine wave signal generated by the inverter and variable frequency motor 3 1 2 Figure 1 2 Low Pass Filter LPF Measurement ...

Страница 21: ...obe at L3 the red probe will measure L1 for the first time Wait until the on the LCD is locked change the red probe to L2 within 5 seconds now the 1 2 3 symbol will be displayed on LCD indicating forward rotation phase sequence Set the first voltage source for COM terminal fix the black probe at L3 the red probe will measure L2 for the first time Wait till the on the LCD is locked change the red p...

Страница 22: ...cy interference signal will be filtrated by a special filter circuit built in the chip this will be suitable for the measurement in variable frequency voltage fields Measurement phase sequence lock time is about 10s more or less When measuring JT2003 products in variable frequency condition due to the impact of multiple harmonic PWM measurement phase sequence lock time is much slower about 30s mor...

Страница 23: ...en measuring high voltage special attention should be paid to avoid electric shock In low pass filter measurement mode meter will automatically change to manual mode Press RANGE button to select corresponding range Measure the known voltage before using the meter to confirm whether the function of the product is correct or not If open circuit or resistance value of measured resistance exceeds the ...

Страница 24: ...ance measurement Use resistance measurement function can self check the built in fuses see Figure 3b for more detail Do not input higher than 30V of DC or AC voltage Circuit continuity measurement If the resistance between two measured ends is more than 50Ω the circuit will be considered as open the buzzer will not sound if the resistance between two measured ends is no more than 10Ω the circuit i...

Страница 25: ...JT2003 Professional Multimeter User Manual 25 Figure 3a Figure 3b ...

Страница 26: ...unction it is a normal value of about 500 800mV 7 Diode Measurement see Figure 4 When measuring on line diode turn off all power supplies in measured circuit and discharge all residual charges on all capacitors before measurement Diode test voltage range is about 3 0V Do not input voltage higher than DC or AC 30V to avoid personal injury Note Figure 4 ...

Страница 27: ...REL function of the meter can be used to subtract it automatically so as to measure reading conveniently If measured capacitance is short circuit or capacitance value exceeds the maximum range of meter the OL will be displayed For large capacitance measurement it will take several seconds to measure and this is normal Fully discharge the residual charges of the capacitance before measurement this ...

Страница 28: ...JT2003 Professional Multimeter User Manual 28 Figure 6 9 Frequency Duty Ratio Measurement See Figure 6 Do not input voltage higher than DC or AC 30V to avoid personal injury Note ...

Страница 29: ...surement If current cannot be estimated start the measurement from a higher range Fuses are set in 20A and mA μ A input sockets Do not put in parallel the probe to any circuit especially power terminal for it will damage the meter and endanger personal safety It is available to continuously measure the current up to 10A When measuring current of 10A 20A it should not take more than 30 seconds It i...

Страница 30: ...tion will be turned off in 30 seconds In addition the auto backlight function will be turned off after pressing OFF button while the backlight is on if it is necessary to restart the backlight function just turn off the unit and turn it on again Press and hold SELECT button in power off state and power on the meter auto off function will be cancelled Recover auto off function to restart Buzzer The...

Страница 31: ...on range of ambient temperature is stable in 1 C If the temperature is 18 C or 28 C the additional temperature coefficient error is 0 1 x specified accuracy C Input Impedance mV range is 1000MΩ other ranges are 10MΩ mV range short circuit allows numbers more than 5 and other ranges will be reset to zero Maximum Input Voltage 1000V Note Range Resolution power Accuracy Description 600 0mV 0 1mV 0 7 ...

Страница 32: ... then divided by and obtain the reading range AC LoZ 600 0V 0 1V 2 0 3 Input resistance 300KΩ PEAK HOLD V peak capture time is 250μs 2 0 100 Input value x 2 2 100 MOTOR 600 0V 0 1V 1 5 5 2 AC Voltage Measurement Input impedance is about 10 MΩ Display true RMS Frequency Response 45 5 kHz Under the condition of variable frequency power supply the measured voltage value is only for reference When the...

Страница 33: ...000V range this range is 1 5 in full value Non sine waveform Wave peak factor is 1 0 to 2 0 accuracy should be added 1 0 Wave peak factor is 2 0 to 2 5 accuracy should be added 2 5 Wave peak factor is 2 5 to 2 0 accuracy should be added 4 0 Maximum input voltage 750Vrms Range Measured value Displayed value Probe short circuit value Overload protection 1000V 3 Resistance measurement Range Resolutio...

Страница 34: ...ly 1mV Open circuit voltage is about 3 0V The normal voltage value of silicon PN junction is about 0 5 to 0 8V 4 Circuit Continuity Diode Measuring 5 Capacitance measuring Overload protection 1000V Overload protection 1000V It is suggested that measured capacitance no more than 1μF should be measured in REL measurement mode to ensure measurement accuracy Range Resolution Accuracy In REL mode 6 000...

Страница 35: ... 1 99 9 0 1 2 5 Overload protection 1000V Input amplitude a DC level is zero 100 kHz 200mVrms a 30Vrms 100kHz 1MHz 600mVrms a 30Vrms 1MHz 10MHz 1Vrms a 30Vrms 10MHz 1 8Vrms a 30Vrms Duty ratio Only suitable for measurement less than 10kHz Input sensitivity is 2Vpp duty cycle 10 0 95 0 Frequency 1 kHz Duty cycle 10 0 95 0 Frequency 1 kHz Duty cycle 30 0 70 0 ...

Страница 36: ...10 mA 1 2 5 Overload protection µA mA range F1 fuse Φ6x32 mm FF 600mA H 1000V CE 20A range F2 fuse Φ10x38 mm FF 11A H 1000V CE Available to continuously measure the current up to 10A When measuring the current of 10A 20A it should not take more than 30 seconds we suggest to wait for 15 minutes before measuring the low current continuously with the instrument after measuring the current of more tha...

Страница 37: ...waveform Wave peak factor is 1 0 to 2 0 accuracy should be added 1 0 Wave peak factor is 2 0 to 2 5 accuracy should be added 2 5 Wave peak factor is 2 5 to 2 0 accuracy should be added 4 0 Overload protection Overload protection for similar DC current measurement Available to continuously measure the current up to 10A When measuring the current of 10A 20A it should not take more than 30 seconds we...

Страница 38: ...curacy will be influenced Battery specification is 6F22 9V Set the power switch to OFF remove the probes from the input sockets and take away the protective case Use a screwdriver to unscrew 3 fixed screws in the battery back cover remove the battery back cover and replace Undervoltage old batteries and blown fuse F1 fuse Φ6x32 mm FF 600mA H 1000V CE F2 fuse Φ10x38 mm FF 11A H 1000V CE 1 2 1 Gener...

Страница 39: ...JT2003 Professional Multimeter User Manual 39 Figure 9 ...

Страница 40: ...JT2003 Professional Multimeter User Manual 40 ...

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