The multimeter has data measurement functions such as DC voltage, AC voltage, DC current, AC current, resistance, diode, on-off, capacitance, temperature, NCV, LIVE, frequency, duty cycle, etc. It can switch between automatic and manual gear measurement (default automatic gear) and HOLD data saving function. It also has powerful data waveform recording function, and can achieve data waveform reproduction function with the help of upper computer software. The function setting for the multimeter interface screen to stay on for a long time. Voltage/current gear intelligent switching: When measuring voltage, the multimeter probe is connected to the current measurement port, and the instrument can automatically switch to the current measurement interface.
（Note: To avoid electric shock, please remove the probe before connecting the USB device. The multimeter function will be disabled during charging）
1. Gear switching
According to the desired measurement method, short press the button on the right side of the device to switch the multimeter range, which is the multimeter high range switch; After selecting a certain gear, press this function button 
to switch，It is a small gear switch, and the current measured gear icon and measurement unit will be displayed on the screen.
2. AC/DC voltage measurement
Insert the red probe into the “V Ω” socket and the black probe into the “COM” socket;
When short pressing the button on the right side of the device switches to the DC voltage measurement interface, the measurement unit changes to “V”, Short press this function button ， Can switch back and forth between the DC voltage measurement interface and the AC voltage measurement interface;
Read the measurement results from the display interface. The secondary display shows the ambient temperature in DC voltage mode and the frequency in AC voltage mode.
（Note: Do not input voltage higher than AC 600V as there is a risk of damaging the instrument.
When measuring high voltage, special attention should be paid to avoiding electric shoc.
When the measured voltage is ≥ 30V safe voltage, the LCD of this instrument displays a high voltage warning prompt “”。）
3. AC/DC current measurement
Insert the red probe into the “A” socket and the black probe into the “COM” socket;
Short press the button on the right side of the device to switch to the current measurement interface, and the measurement unit will change to “A”, Short press the function button to switch back and forth between the DC current measurement interface and the AC current measurement interface;
Disconnect the circuit path to be tested. Connect the disconnect point with a test wire and then turn on the power.
Read the measurement results from the display interface. The secondary display shows the ambient temperature in DC current mode and the frequency in AC current mode.
Voltage/current gear intelligent switching function: When measuring voltage, insert the multimeter probe into the “A” socket, and the instrument can automatically switch to the current measurement interface.
（Note：To prevent damage to the circuit and possible current fuse burnout, please do not cross (parallel) the probe with the energized circuit when inserting the test wire into the current terminal, as this can cause a short circuit. The maximum current value measured by this instrument is 10A.）
4. Resistance measurement
Insert the red probe into the “V Ω” socket and the black probe into the “COM” socket;
Short press the button on the right side of the device to switch to the resistance measurement interface, and the measurement unit will change to “Ω”;
Connect the probe in parallel to both ends of the measured resistor;
Read the measurement results from the display interface, and the secondary display shows the ambient temperature.
（Note：If the measured resistance is open or exceeds the maximum range of the instrument, the display will show “0L”.
When measuring online resistance, all power sources in the tested circuit must be turned off and all capacitors must be discharged with residual charges before measurement. To ensure accurate measurement.
Do not input voltages higher than 30V DC or AC to avoid endangering personal safety.）
5. Capacitance measurement
Insert the red probe into the “V Ω” socket and the black probe into the “COM” socket;
Short press the button on the right side of the device to switch to the capacitance measurement interface, and the measurement unit will change to “nF”;
Connect the probe in parallel to the two terminals of the measured capacitor;
Read the measurement results from the display interface, and the secondary display shows the ambient temperature.
（Note：If the measured capacitance is short circuited or exceeds the maximum range of the instrument, the display will show “OL”.
For measurements of capacitors greater than 400uF, a certain reading stabilization time is required for accurate readings.
To ensure measurement accuracy, it is recommended to discharge all residual charges from the capacitor before inputting it into the instrument for measurement. For capacitors with high voltage, it is more important to avoid damaging the instrument and endangering personal safety.）
6. Continuity detection
Insert the red probe into the “V Ω” socket and the black probe into the “COM” socket;
Short press the button on the right side of the device to switch to the “ ”measurement interface, At this point, the measurement unit changes to “Ω”, Short press the function button , It can switch back and forth between the buzzer measurement interface and the diode measurement interface. Under the diode measurement interface, the measurement changes to “V”;
When measuring the buzzer gear, connect the probes in parallel to both ends of the tested circuit load. If the resistance between the two terminals being tested is less than 30 Ω, it is considered that the circuit is conductive, and the buzzer sounds continuously. If the resistance is greater than 50 Ω, the buzzer does not sound, and the secondary display shows the ambient temperature when the buzzer is in gear;
（Note：When checking the continuity of online circuits, all power sources in the tested circuit must be turned off and all capacitors must be discharged with residual charges before measurement. Do not input voltages higher than 30V DC or AC to avoid endangering personal safety.）
When switching to the “
”measurement mode, Read the approximate forward PN junction voltage of the tested diode directly from the display interface. For silicon PN junctions, a normal value of about 500-800mV is generally confirmed, and the secondary display shows the ambient temperature.
（Note：If the tested diode is open or has reverse polarity, it will display “0L”.
When measuring online diodes, all power sources in the tested circuit must be turned off and all capacitors must be discharged with residual charges before measurement.
Do not input voltages higher than 30V DC or AC to avoid endangering personal safety.）
7. Frequency and duty cycle measurement
Insert the red probe into the “V Ω” socket and the black probe into the “COM” socket;
Short press the button on the right side of the device to switch to the frequency measurement interface. At this point, the measurement unit changes to “Hz”, and “0.0%” is displayed in front of the frequency unit as the duty cycle unit;
Connect the probes in parallel to both ends of the tested object and read the test results from the display interface. The main display shows the frequency and the auxiliary display shows the duty cycle.
（Note：Do not input voltages above 60V DC or 30V AC to avoid damaging instruments and endangering personal safety.）
8. Temperature measurement
1) Automatic detection of ambient temperature
The product is equipped with automatic environmental temperature detection (secondary display), and the accuracy is for reference only (please restart the device to refresh the current temperature when the product is in different environments).
2) When the HVAC water temperature detection is open circuit, it displays “current ambient temperature”, and the secondary display shows the ambient temperature; By connecting the K-type temperature sensor, temperature measurement can be performed in Celsius ℃ or Fahrenheit ℉ (℉=℃ * 1.8+32).
Short press the function button to switch back and forth between temperature units: ℉, ℃.
Thermocouples should be inserted into the “V Ω” socket with the positive+end and the “COM” socket with the negative - end
9. NCV/LIVE
Short press the button on the right to switch to “NCV” mode without inserting the probe.
Non contact AC voltage sensing NCV: The NCV position on the upper end of the instrument is placed close to the measured conductor or socket for detection. When current is sensed, The measurement interface displays based on the sensing intensity “—“ “——“ “———“ “————“, Accompanied by buzzing sound, the secondary display shows the ambient temperature;
When there is no detection electric field on the product, the main display shows “EF” and the secondary display shows the ambient temperature.
（Note：NCV sensing endpoints should be used to approach the measured electric field, otherwise it will affect the measurement sensitivity.
When the measured electric field is above 100V AC voltage, attention should be paid to observing whether the conductor of the measured electric field is insulated to avoid harming personal safety.）
Short press the function button on this interface ，You can switch back and forth between the NCV measurement interface and the LIVE measurement interface.
Fireline LIVE identification measurement:
After switching to “LIVE” mode: Insert the red probe into the V terminal, touch the mains socket or bare wire, and distinguish between live and neutral wires
Product without detection display status: The main display shows “LIVE”
When detected as a zero line, the main display shows “LIVE” unchanged;
Sensing the “live wire” of the mains power, the main display shows the “OL” symbol and changes the sound according to the induction intensity, indicating the strength of the live wire voltage.
The secondary display shows the ambient temperature.
（Note：When measuring the LIVE function, to avoid interference from the COM input terminal’s electric field on the accuracy of distinguishing between live and neutral wires, please remove the black probe from the COM terminal.
When encountering dense high voltage and strong electricity, the accuracy of the product’s judgment of the “live line” may be unstable, and it should be judged by LCD display and combined with comparative sound frequency. ）
10. Manual and automatic range switching
Under the interface of measuring voltage, current, resistance, capacitance, and frequency, Short press the function button 
to enter the automatic range setting interface, The range can be manually set for more accurate measurement.
11. Data retention function/waveform data saving
In multimeter mode, Short press the function button 
to keep the data on the multimeter; Long press the function button ，Can save the current waveform data.
If it is necessary to delete the waveform data file, Long press the function button , Enter the settings menu interface, select the “File” menu to delete saved content.
