MT-1820

MT-1820 3 5/6 Dual Display DMM w/USB Connector User’s Manual 1st Edition, 2013 ©2013 Copyright by Prokit’s Industries Co., Ltd. Index General…………………………………………………………………. 2 Open Package Inspection…………………………………..……. 2 Safety Note………………………………………………………… 3 Safety Symbol Description…………………………………...4 Fr on t Pa nel Des c ri pti on …… …… … … …… …… … … ….. .5 Property………………………………………………………………….7 DC Voltage (DCV) …………………………………………………7 AC Voltage (ACV) …………………………………………………8 DC Current (DCA) …………………………………………………9 AC Current (ACA) …………………………………………………11 Resistance …………………………………………………12 Diode and Continuity Test ……………………………………...14 Capacitance (C) …………………………………………………15 Frequency (Hz) ………………………………………………… 16 Transistor Test …………………………………………………18 Temperature Test …………………………………………………19 Other Function & Instrument Maintenance …………………… 20 Software Operation……………………………………………………22 Fault Elimination……………………………………………………… 23 1 General The instrument is a high performance, high accuracy, 3 5/6 dual display DMM w/usb connector multimeter, it uses the LCD with 24mm high figure to make the reading clear, the display simple and the operation convenient. The instrument can measure DC and AC voltage, DC and AC current, Resistance, Capacitance, Frequency, Duty Circle, Transistor, Diode and Continuity test; And it also has the features of Bar Graph, Unit Indication, Data Hold, Relative Value Measurement (REL), USB Interface, AUTO/MANUAL range selection, Auto Power Off and Alarm Buzzer. The instrument adopts the directly driven 4 digits microprocessor and dual-integral A/D converter, which provide the high solution and high accuracy digital displaying driver. Because of its outstanding features, it is an excellent tool and most suitable for lab, factory, maintenance and repair users. Open-package Inspection Open the package box and take out the instrument, check the following accessories carefully. If any accessory was lost or damaged, please contact the manufactory at once. • Digital Multimeter 1pc • Operation Manual 1pc • Test Lead 1set • Temperature Cable 1pc • USB Cable 1pc • Software disc 1pc • Transistor test accessory 1pc 2 Safety Note The instrument meets the standard of IEC1010 (safety standard promulgated by the International Electrician Committee). Design and manufacture complied with the standard of Pollution Degree Warning To avoid endangering the users safety, should read the operation manual carefully before operation, and strictly obey the safety warning information and operation description when use the instrument. 1. Caution to avoid the electric shock when measuring the voltage higher than 30V, the current higher than 10mA, AC Power Lines with Inductive Load and the AC Power Lines during the period of Electric Power Fluctuation. 2. Before measuring, should check if the function knob is set in the correct range, make sure the test lead connects reliably, links up correctly, and insulates properly to avoid the electric shock 3. It meets the requirements of the safety standard only to use the instrument with the equipped test lead. If the test lead is broken, should replace it by the same type and same electric specification test lead. 4. Do not replace the inside fuse by the unconfirmed one. Only replace it by the same type and specification fuse. Before replacement, should keep the test lead off the tested point to make sure there is no any signal at the input terminal. 5. Do not replace the inside battery by the unconfirmed one. Only replace it by the same type and electric specification battery. Before replacement, should keep the test lead off the tested point to make sure there is no any signal at the input terminal. 6. When measuring electricity, do not connect the body with the ground directly, and do not touch the possible exposed metal terminal, output socket or lead clamp with ground potential. Usually use the dry cloth, rubber overshoes, rubber cushion and other insulated materials to keep the body isolated with the ground. 3 7. Do not store and use the instrument in high humility, high temperature, combustible, explosive and strong magnetic places. 8. It is possible to damage the instrument and endanger the safety of the users when measuring the voltage over the range limit. The allowed maximum voltage is printed on the front panel of the instrument, do not input the range limit specified to avoid the electric shock and instrument damage 9. Do not measure any voltage when connecting the test lead with the current terminal to avoid damaging the instrument and endangering the safety of the users. 10. Do not try to calibrate or repair the instrument, should operate it by the specially trained or qualified professional people. 11. The function/range selection knob should be set in the correct range when measuring. When switching the function/range selection knob, keep the test lead off the tested object to make sure there is no any signal at the input terminal. Do not switch the function/range selection knob when measuring. ”, please replace the battery in time to 12. When LCD displays “ make sure the measuring accuracy. 13. Do not allow to measure the voltage when connecting the test lead with the current terminal! 14. Do not try to modify the inner circuit at will to avoid damaging the instrument and endangering the safety of the users. Safety Symbol Description Warning DCA High Voltage! Dangerous! ACA GND DCA & ACA Dual Insulation Meets the direction of European IEC Low Battery Fuse 4 Front Panel Description 1. Instrument Model Number 2. LCD Display 3. RANGE: Auto Range/ Manual Range switch, the default is set as Auto Range mode when turning on, press the button and switch to Manual Range. At the Manual Range mode, press the button once, the range is switched to the higher one, press the button again to switch the range to the lowest one when measuring the highest range, the cycle is in proper order from low to high. Keep pressing the button for 2 sec, return to Auto Range mode. There is no Manual Range mode at Frequency, hFE and Capacitance range. 4. HOLD: Date Hold button, press the button, the value is held on LCD; Press the button again, exit the hold mode and get into the normal measuring status. Press the button more than 2 seconds, the back light will be light up, press again the backlight turns off or automatically turns off after 10 seconds. 5. HZ/DUTY: Frequency/Duty Circle selection button, press the button to switch between the Frequency and Duty Circle mode at Frequency Range; Press the button to switch to Voltage or Current/Frequency/Duty Circle model at AC Voltage or AC Current Range. 5 6. MAX/MIN: Maximum, Minimum, press the button, the instrument gets into the MAX mode, the measuring maximum value will be held at this mode; Press the button again to get into the MIN mode, the measuring minimum value will be held at this mode. At the MAX/MIN mode, the maximum or minimum value will be held on LCD. Under this circumstance, there are no Bar Graph and Auto Power Off function, hold pressing MAX/MIN button for 2 seconds, exit the MAX/MIN mode. 7. SELECT: function switch, press the button to switch the measuring function. 8. RS232/REL: Relative Value Measurement, press the button to the mode of Relative Value Measurement, press again to cancel the Relative Value Measurement. Keep pressing the button more than 2 seconds to switch to RS232 symbol appears on LCD, it indicates the instrument is getting into the status of data transmission. Keeping pressing the button more than 2 seconds, RS232 symbol disappears, the data transmission is stopped. 9. Function/range selection knob: select the measuring function and range. 10. 10A current input terminal: Measuring AC/DC 10A positive input terminal, insert red test lead. 11. mA input terminal: Measuring AC/DC uA/mA and Temperature positive input terminal. The hFE input terminal. 12. COM input terminal: Temperature negative input terminal,and hFE input terminal, insert the black test lead. input terminal: measure Voltage, Frequency/Duty Circle, 13. Resistance, Capacitance, Diode and Continuity positive input terminal, insert the red test lead 6 Property General Feature 1-1 Display: LCD 1-2 Max Display: 5999 (3 5/6) counts automatic polarity display and unit display. 1-3 Measuring method: dual-integral A/D converter 1-4 Sampling rage: 3 times/second 1-5 Over range indication: display “OL” 1-6 Low battery indication: “ ” appearance 1-7 Operation environment: 0~40˚C relative humidity