Pro'sKit MT-1860 Professional Digital Multimeter User Manual

General

The MT-1860 is a new type of 3 5/6 digital multimeter featuring touch-sensitive function keys instead of traditional mechanical knobs. It is equipped with an LCD display showing text at 33mm height, offering visual clarity, easy operation, stable performance, and high reliability. It can measure DC voltage, AC voltage, DC current, AC current, resistance, capacitance, frequency, temperature, diode, and perform continuity tests. Features include unit symbol display, data retention, maximum/minimum value measurement, automatic/manual range switching, automatic power-off, and alarm functions. The unit utilizes a switching integrated circuit to directly drive an LCD microprocessor and a double-integrating A/D converter with a digital display drive, ensuring high resolution and precision. Its comprehensive functions, high accuracy, and convenient operation make it an ideal tool for laboratories, factories, radio enthusiasts, and home use.

Open-package Inspection

Open the package box and carefully inspect the meter and accessories for any absence or damage. If any issues are found, contact the distributor immediately.

• Digital Multimeter: 1 PC
• Instruction Manual: 1 copy
• Test Leads: 1 pair
• Temperature Probe (K-Thermocouple): 1 PC
• PC Interface Cable: 1 PC
• Software Disk: 1 PC
• Holster: 1 PC

Safety Note

In accordance with IEC1010 clause (safety standard issued by the International Electrotechnical Commission), the MT-1860 is designed and produced according to the safety requirements for pollution level II.

⚠️ Warning:

To avoid endangering operator safety, read this instruction manual carefully before operating the instrument and strictly adhere to the safety warnings and operating instructions.

1. When measuring voltages above 30V, currents above 10mA, AC power lines with inductive loads, or during power line fluctuations, be aware of electric shock hazards.
2. Before measurement, verify that the measurement function displayed on the LCD matches the selected function. Check if the push button switch is in the trigger position, if the meter pens are reliably contacted, correctly connected, and well-grounded to prevent electric shock.
3. The meter meets safety standards only when used with its matched meter pens. If a meter pen cable is damaged, it must be replaced with one of the same model or electrical specification.
4. Do not use unconfirmed or disapproved protector tubes to replace internal meter pen protector tubes. Only tubes of the same model or specification are permitted. Before replacement, remove the meter pen from the measuring point and ensure there is no signal at the input terminal.
5. Do not use unconfirmed or disapproved batteries to replace the internal battery. Only batteries of the same model or electrical specification are permitted. Before replacement, remove the meter pen from the measuring point and ensure there is no signal at the input terminal.
6. During electrical measurements, avoid direct contact with the ground. Do not touch uncovered metal terminals, output ports, or lead clamps where earth potential may exist. Use dry clothing, rubber shoes, rubber cushions, and other insulating materials to insulate yourself from the ground.
7. Do not store or use the instrument in environments with high temperature, high humidity, flammable materials, or strong magnetic fields.
8. Measuring voltages beyond the permitted ultimate voltage value can damage the meter and endanger operator safety. The instrument panel indicates the maximum permitted voltage; never exceed this standard. Do not input values outside the regulation to avoid electric shock and meter damage.
9. When the meter pen is inserted into a current socket, do not measure any voltage to prevent meter damage and operator endangerment.
10. Do not attempt to calibrate or repair the meter yourself. If necessary, only qualified professional personnel with special training or approval should perform these tasks.
11. During measurement, ensure the measurement function matches the LCD display. Always disconnect the meter pen from the measured object first and ensure there is no input signal. Switching the function/range selection switch during measurement is forbidden.
12. When the LCD displays "?⬇️" (low battery symbol), replace the battery immediately to ensure measurement accuracy.
13. It is not allowed to insert the meter pen into the current terminal to measure voltage.
14. Do not arbitrarily change the meter's circuits, as this may damage the meter and endanger safety.

Description of Safety Symbols

Description of Instrument Panel and Push button Functions

1. Instrument model.
2. LCD display area.
3. Function button: Used to select various measurement functions.
   • 3-1 "[HOLD]" backlight switch and reading-keeping switch. Pressing the switch for over 2 seconds turns on the backlight. Pressing again for over 2 seconds turns off the backlight or it turns off automatically after 10 seconds. Pressing the switch within 2 seconds locks or unlocks data retention. Press once to lock, press again to unlock.
   • 3-2 [Hz/DUTY]: Press this key in the frequency gear to switch between frequency and Duty Cycle. In AC Voltage or AC Current gear, press this key to switch among voltage, current, frequency, and duty cycle.
   • 3-3 [MAX/MIN]: Displays maximum and minimum values. Press the function button to enter MAX mode (holds maximum value), then press again to enter MIN mode (holds minimum value). The display shows the MAX/MIN value. No analog bar display or auto power-off function in this mode. Press and hold the [MAX/MIN] button for 2 seconds to exit MAX or MIN test.
   • 3-4 [RANGE]: Automatic/Manual Range Switch. The device defaults to automatic range on startup. Press to switch to manual range. In manual range mode, pressing "[RANGE]" once cycles through ranges. When the highest range is reached, it cycles back to the lowest. Pressing "[RANGE]" for over 2 seconds exits manual range and returns to automatic range measurement.
   • 3-5 [REL/RS232]: Relative Value Measurement. Press to show relative value, press again to cancel. Pressing this key for over 2 seconds switches to RS232, indicated by an RS232 symbol on the LCD, enabling data transmission. Pressing again for over 2 seconds hides the RS232 symbol, terminating data transmission.
4. "[POWER]" is the power switch.
5. Function Selection Button.
6. [VΩHz] Input Port: Measure voltage, frequency, resistance, capacitance, diode, and continuity test. Connect the red meter pen here.
7. [10A] current input jack: Measure AC/DC current up to 10A. Connect the red meter pen here.
8. [mA] input port: Measure AC/DC current. Connect the red meter pen here.
9. [COM] input port: Measure the negative input terminal. Connect the black meter pen here.

Diagram Description: The instrument panel features an LCD display area and various function buttons ([POWER], [HOLD], [RANGE], [Hz/DUTY], [MAX/MIN], [REL/RS232], [DC/AC], [Hz/C/F]). Input ports include [10A], [mA], [VΩHz], [COM], and [TEMP+]. Probe connection diagrams illustrate connecting the red probe to the positive input terminal (e.g., VΩHz, 10A, mA) and the black probe to the [COM] terminal for various measurements.

Other Functions

1. Automatic power off: The meter powers off automatically after 15 minutes of inactivity, entering a dormant state. A built-in buzzer sounds one minute before power-off. To restart, press the power switch. To cancel automatic power-off, press and hold the "[REL]" key for over 2 seconds until the RS232 symbol appears; the "APO" symbol will also turn off.

Property

General features

• Display mode: LCD.
• Maximum display: 5999 (3 5/6 digit) with automatic polarity and unit display.
• Analog bar: 30 times/sec, displaying 61 analog bars.
• Measurement mode: Dual integration A/D conversion.
• Sampling rate: Approximately 3 times/sec.
• Over range: Displays "OL".
• Low voltage display: Approximately 2.4V, indicated by a specific symbol.
• Working temperature: 0~40°C.
• Storage temperature: -10~50°C, relative humidity <80%.
• Power: Two 1.5V batteries ("AAA" batteries).
• Dimensions: 185mm×91mm×49mm (Length x width x height).
• Weight: Approximately 410g (including battery).

Technical features

• Accuracy: ±(a% reading + d digits), with guaranteed accuracy at an ambient temperature of 23±5°C and relative humidity <75%.
• Calibration warranty period: One year from the ex-factory date.

DC Voltage (DCV)

1. Press the "[AC/DC]" button to select automatic DC voltage measurement. Connect the red and black meter pens to the "[VΩHz]" and "[COM]" terminals, respectively.

2. The meter defaults to DC voltage automatic measurement mode, displaying "DC", "AUTO", "APO". Press "[RANGE]" to select manual range mode. Press "[MAX/MIN]" once to display the maximum measurement value, and again to display the minimum value. Press and hold "[MAX/MIN]" for over 2 seconds to cancel MAX/MIN measurement.

3. Touch the measuring point with the meter probes and connect them in parallel to the circuit being tested. The polarity of the red meter pen and the tested voltage value will be displayed spontaneously.

⚠️ Caution:

• Voltages over DC1000V or AC750V cannot be tested.
• When measuring high voltages, take special precautions to avoid electric shock. After measurement is completed, immediately disconnect the meter pen and the measured circuit.
• If "OL" is displayed in manual range mode, it indicates the range has been exceeded, and a higher range mode is necessary to complete the measurement.

Input impedance: 600mV range > 60MΩ, others are 10MΩ. Overload protection: 1000VDC or 750V alternative peak.

AC Voltage (ACV)

1. Press the "[AC/DC]" key until AC Voltage automatic measurement mode is selected. The LCD will display "AC", "AUTO", "APO". Connect the red and black meter pens to the "[VΩHz]" and "[COM]" terminals.

2. The meter defaults to automatic range (shows "AUTO"). Press "[RANGE]" to switch to manual range mode. In AC mode, pressing "[Hz/DUTY]" allows measurement of frequency/duty cycle. The frequency response in this mode is low, suitable for high voltage and low frequency measurements in environments with magnetic field interference, such as 220V/50Hz-400Hz, 380V/50Hz-400Hz.

⚠️ Caution:

• Voltages over DC1000V or AC750V cannot be tested. If "OL" is displayed in manual range mode, it indicates the range has been exceeded, and a higher range mode is necessary to complete the measurement.

Input impedance: 10MΩ. Overload protection: 1000VDC or 750V alternating peak. Display: Mean value response (calibrated with sine wave). Frequency response: (40-400)Hz. Duty Cycle Display: (0.1%-99.9%).

DC Current (DCA)

1. Press the "[mA]" button or "[A]" button. Plug the black meter pen into the "[COM]" terminal and the red meter pen into the "[mA]" or "[10A]" terminal.

2. Press the "[mA]" or "[A]" button to select automatic DC 600mA and 10A current measurement. The LCD will display "DC", "AUTO", "APO".

3. If "OL" is displayed, the measured current has exceeded the current range; select higher ranges for measurement.

⚠️ Caution:

• In 10A mode, current greater than 10A cannot be measured. In mA mode, current greater than 600mA cannot be measured. Otherwise, this will lead to fuse blowing or instrument damage.
• When the meter pen is plugged into the current input terminal, it is strictly prohibited to connect the meter pen in parallel on any circuits.

Maximum input current: 10A (not exceeding 15s). Overload protection: 0.6A/250V fuse; 10A/250V fuse.

AC Current (ACA)

1. Press the "[mA]" button or "[A]" button. Plug the black meter pen into the "[COM]" terminal and the red meter pen into the "[mA]" or "[10A]" terminal.

2. Press the "[mA]" or "[A]" button to select automatic AC 600mA and 10A current measurement. The LCD will display "AC", "AUTO", "APO".

3. If "OL" is displayed, the measured current has exceeded the current range; select higher ranges for measurement.

⚠️ Caution:

• In 10A mode, current greater than 10A cannot be measured. In mA mode, current greater than 600mA cannot be measured. Otherwise, this will lead to fuse blowing or instrument damage.
• When the meter pen is plugged into the current input terminal, it is strictly prohibited to connect the meter pen in parallel on any circuits.

Maximum input current: 10A (not exceeding 15s). Overload protection: 0.6A/250V fuse; 10A/250V fuse. Frequency response: 40-400Hz. Duty Cycle Display: (0.1%-99.9%).

Resistance (Ω)

1. Press the "[Ω]" button. Connect the red and black meter pens to the "[VΩHz]" and "[COM]" terminals.

2. Press the "[Ω]" button to select resistance measurement. The corresponding symbol will appear on the LCD. In automatic resistance measurement mode, you can select manual measurement by pressing "[RANGE]".

⚠️ Caution:

• When measuring capacitance, all power sources within the tested circuits must be disconnected, and the capacitance must be sufficiently discharged.
• When measuring resistance, any occurrence of voltage may lead to inaccurate readings. If the 250V protection voltage is exceeded, it may damage the meter or endanger the user's safety.
• When using the 600Ω range, first short-circuit the meter pens and measure the resistance of the lead wires, then deduct it from the actual measurement.

Open circuit voltage: 600mV. Overload protection: 250V DC or AC peak values.

Diode and On-and-Off Test

1. Press the "[Ω]" button. Connect the red and black probes to the "[VΩHz]" and "[COM]" terminals.

2. Press the "[Ω]" button to select the diode or buzzer measurement. In Diode mode, the LCD displays "V" and a voltage symbol, along with the buzzer symbol " ".

3. Connect the red meter pen to the positive of the diode and the black meter pen to the negative of the diode.

⚠️ Caution:

• If the diode is open circuit or the polarities are connected reversely, "OL" will be displayed on the screen.
• When checking the diode, all power within the tested circuits must be disconnected, and the capacitance shall be sufficiently discharged.
• When the measurement is completed, immediately disconnect the meter and the measured circuit.

Overload protection: 250V DC or AC peak value.

Capacitance (C)

1. Press the "[Ω]" button. Connect the red and black meter pens to the "[VΩHz]" and "[COM]" terminals.

2. Press the "[Ω]" button to select automatic capacitance measurement. The corresponding symbol will appear on the LCD. Manual measurement range and analog bar are not displayed in Capacity mode.

⚠️ Caution:

• When measuring capacitance, all power sources within the tested circuits must be disconnected, and the capacitance shall be sufficiently discharged.
• When measuring large capacitors, it takes a longer time, approximately 100uF per 15 seconds.
• When the measurement is completed, immediately disconnect the meter and the measured circuit.

Overload protection: 250V DC or AC peak value.

Frequency (Hz)

1. Press the "[Hz/°C/°F]" button for frequency measurement. Connect the meter pens to "[VΩHz]" and "[COM]".

2. Connect the probe tips in parallel with the signal source to be measured and read the results from the display. (Note: No analog bar will be displayed in this mode).

3. During frequency measurement, press the "[Hz/DUTY]" key once to conduct duty cycle measurement, and press again to enter the frequency status.

4. Read the current results from the display.

⚠️ Caution:

• Do not input signals higher than 60V, otherwise it may damage the instrument and pose dangers to human safety.
• After all measurements are completed, it is necessary to disconnect the meter pens and the tested circuit.

Input sensitivity: 1.5V effective value. Overload protection: 250V DC or AC peak value.

Temperature Measurement

1. Press and hold the "[Hz/°C/°F]" button for over 2 seconds to select temperature mode for Celsius measurement. The temperature symbol will be displayed. Press again for Fahrenheit display. The procedure repeats. To exit temperature measurement, press and hold "[Hz/°C/°F]" for over 2 seconds.

2. Connect the positive input end and negative insertion end of the temperature probe into the "[VΩHz]" and "[COM]" terminals, respectively.

3. Place the sensing end of the temperature probe on the surface of the tested object.

4. Read the current testing results from the display.

⚠️ Caution:

• When the input end is open circuit, it indicates normal temperature.
• Do not change the temperature sensor at random, otherwise the accuracy of measurement cannot be guaranteed.
• Do not input voltage in temperature mode, otherwise the meter may be damaged.

K-Thermocouple (Nickel-chromium - nickel silicon) banana probe.

Communication Connection

1. Select setup to conduct installation according to the corresponding instrument models indicated by the disk in the package.

2. Connect the instrument to the computer by USB cable.

3. Press and hold "[RS232/REL]" for over 2 seconds; the "RS232/REL" symbol will be displayed on the screen.

4. Once the testing data is transmitted to the computer, you can start recording, analyzing, processing, and printing the data. For more details, please refer to the instructions in the software.

Instrument Maintenance

This instrument is a sophisticated instrument, and the user shall not modify the electric circuit at will.

1. Cautions should be taken for water prevention, dust prevention, and fall prevention.
2. It shall not be stored in environments with high temperature, high humidity, and strong electromagnetic fields.
3. Please use a damp cloth and mild detergent to clean the exterior of the instrument; do not use strong solvents such as abrasives and alcohol.
4. If the instrument is not used for a prolonged period, the battery shall be removed to avoid battery leakage from corroding the instrument.
5. Pay attention to the battery status. When the LCD displays a flashing "?⬇️" symbol, the battery shall be replaced.

The steps for battery replacement are as follows:

1. Loosen the screw on the back cover that secures the battery door and remove the battery door.
2. Remove the 3V batteries and replace them with two new ones. Although any standard 3V battery can be used, alkaline batteries are recommended for longer service life.
3. Mount the battery door and tighten the screw.
4. Fuse replacement: The steps are as above. When replacing the fuse, please use a fuse of the same size and type.

⚠️ Caution:

• Do not connect DC or AC peak voltages higher than 1000V.
• Do not measure voltage in current mode, resistance mode, diode mode, or buzzer mode.
• Do not use the meter if the battery is not mounted properly or the back cover is not tightened.
• Prior to the replacement of battery or fuse, please remove the measuring pen from the measuring point and switch off the meter.

This Instruction is subject to change without any further notice. The content of this Instruction is considered correct; if readers find any errors or missing parts, please contact the manufacturer. The Company shall not be held liable for any accidents and hazards resulting from user mal-operations. The functions elaborated by this Instruction shall not be taken as reasons for using the product for special purposes.