MAXWELL 25 702 Automatic Full Screen Multimeter User Manual

MAXWELL 25 702 Automatic Full Screen Multimeter

Product Information

• Model Number: 25702
• Power Source: 2x 500 mAh 3.7 V Li-Ion battery
• Display: 4 digits (9999), 4.2 TFT
• Recommended Mains Adapter Specification: USB 5 V 600 mA – 2 A
• Charging Connector: USB Type-C
• Charging Time: 2 hours
• Size: 137 x 70 x 20 mm
• Weight: ~133 g

General Technical Parameters

• DC Voltage Measurement Range: 10 V – 600 AC Voltage Measurement Range: 10 V – 600 V
• DC Current Measurement Range: 60 mA – 600 mA
• AC Current Measurement Range: 60 mA – 600 mA
• Resistance Measurement Range: 100 Ω – 20 MΩ
• Frequency Measurement Range: 10 Hz – 1 MHz
• Capacity Measurement Range: 100 nF – 100 mF
•  TRUE RMS: Yes
• Diode Test: Yes
• Data Hold: Yes
• Automatic Shutdown: Yes – Backlight: Yes – Flashlight Function: Yes

Safety Information
Safety Symbols: High voltage, GND (Ground), Double insulation, Continuity test, Attention! Danger!, NCV (Non-contact voltage), Low battery, DC Current, AC Current

Product Usage Instructions

• To turn on/off the device, press the Live (Phase) and On/Off button.
• The LCD display shows the measurement readings and other information.
• Use the USB charger port to charge the device using a compatible mains adapter.
• The device supports data retention on the display and has a backlight that can be turned on/off.
• The NCV function allows for non-contact measurement and also serves as a flashlight when activated.
• Use the function selector button to choose the desired measurement mode.
• The device has an automatic shutdown feature to protect the battery life. If left idle for 15 minutes, it will automatically shut down.
• The device can measure DC and AC voltage, DC and AC current, resistance, frequency, and capacity.
• It also supports TRUE RMS measurement and diode testing.
• The device has a polarity indication feature for AC voltage/DC current measurements exceeding 24 V, which displays a warning in red.
• The battery indicator shows when the battery is low and needs to be charged.
• The device’s external structure includes Live (Phase) and On/Off button, LCD display, USB charger port, data retention/flashlight button, NCV/non-contact measurement/flashlight function button, and function selector button.
• The primary display shows the main measurement readings, while the secondary display shows additional information.
• The device can measure resistance, capacity, voltage, and current.
• It can also measure temperature in Celsius and frequency.
• Follow the safety symbols and precautions mentioned in the user manual for safe usage of the device.

Please refer to the user manual for detailed instructions on specific measurement ranges, resolutions, and accuracies for each measurement mode.

The advantage of the fully automatic multimeter is that during the measurement, the device automatically recognizes which function is needed and performs the measurement in that function. The measurement results can be easily and quickly read from the large display. With the help of the sensor on the back of the device, you can detect voltage without breaking the wiring. The device housing can be characterized as ergonomic, compact and easy to handle. The practical, hard-walled carrier bag protects the product during transport. With the help of the built-in battery, you can use the device for a long time without charging, and you can quickly charge the device through the Type-C port, thereby maximizing the operating time of the device.

• Large „FullScreen” display
• Built-in battery with Type-C port
• Automatic measurement function setting
• Possibility of manual setting (Voltage detection, capacity measurement, frequency measurement)
• Continuity test
• Resistance measurement
• Frequency measurement
• Diode test
• Flashlight function
• Sound signal
• Data retention
• Automatic shutdown
• Accessories: Instrument cord, Type-C-USB cable, carrying case

General technical parameters

safety information

• Before use, make sure that all accessories are in the package and undamaged. The device is designed in accordance with IEC61010 (a safety standard issued by the International Electrotechnical Commission or equivalent GB4793.1). Please read the safety notes before use!
• Take measurements only in the measuring range! Do not use in a larger range!
• If you measure a voltage higher than 36 V DC or 25 V AC, check the connection and insulation of the test leads to avoid electric shock. If the input AC V / DC V voltage exceeds 24 V, the screen will turn red to warn the user of high voltage.
• When changing the measurement mode (functions) and the range, the measuring tips must be removed from the test point.
• Before measuring, always make sure that you measure the voltage corresponding to the measurement limit. Before changing batteries or fuses, always remove the measuring tips from the measuring point and switch off the device.
• Do not operate the device if the battery or battery cover is not properly attached!
• Only measure capacitance, diode or continuity on a powered off circuit
• Please follow local and national safety regulations: When measuring, wear personal protective equipment (gloves, face mask, flame retardant clothing) when necessary to avoid injury from electric shock and arcing.
• Measure only according to the appropriate Standard Measurement Category (CAT). (voltage probe, test lead and adapter)

Safety symbols

•  High voltage
• GND (Ground)
• Double insulation
• Attention! Danger!
• Low battery
• DC Current
• AC Current

Properties

• • LCD display: Maximum value display: 9999
  • Polarity display: automatic positive and negative polarity indication
  • Out of range indication: “OL”
  • High voltage warning: If the input voltage AC V / DV C measured at the measuring point exceeds 24 V, the display will turn red, warning of the presence of high voltage.

• Power supply: Built-in two batteries: 3.7 V,
  500 mA Li-ION
  Low battery voltage indication:

• It indicates that the battery is low, it must be charged in order to use the device properly.
  Automatic shutdown: If there is no operation for 15 minutes, the instrument will automatically shut down to protect the battery life.

external structure

1. Live (Phase) and on / off button
2. LCD display
3. USB charger port
4. Data retention on the display / backlight on / off
5. NCV non-contact measurement / Flashlight function on/off
6. Function selector button

LCD display

1. Automatic shutdown
2. Data retention (data keep)
3. Automatic measuring range
4. Continuity test
5. Battery
6. DC measurement
7. AC measurement
8. Capacity measurement
9. Diode test
10. Phase measurement
11. Non-contact voltage detection (NCV)
12. Secondary display
13. Primary display
14. Resistance, Capacity, Voltage, Current
15. Temperature (Celsius)
16. Frequency

Ac voltage

| Measuring range| Resolution| Accuracy
---|---|---|---
10 V| 0.001 V| ****

± (0.8% + 5)

100 V| 0.01 V
600 V| 0.1 V| ± (1.2% + 10)

• Frequency range: 40 Hz – 400 Hz
• Minimum identification voltage: 0,6 V felett
• Measuring mode: True RMS
• The secondary display area shows the AC accompanying frequency
• AC frequency input sensitivity: ≥50 V
• AC frequency measurement error: 0.2% + 0.02 Hz
• Overload protection: 600 V DC / AC RMS

Dc voltage

| Measuring range| Resolution| Accuracy
---|---|---|---
10 V| 0.001 V| ****

± (0.5% + 3)

100 V| 0.01 V
600 V| 0.1 V| ± (1% + 10)

• Minimum identification voltage above: 0,6 V
• Overload protection: 600 V DC / AC RMS

Ac current

| Measuring range| Resolution| Accuracy
---|---|---|---
60 mA| 0.01 mA| ± (1.5% + 10)
600 mA| 0.1 mA| ± (2% + 5)

• Minimum identification current: above 2 mA
• Frequency range: 40 Hz – 400 Hz
• Measuring mode: True RMS
• The secondary display area shows the AC accompanying frequency
• AC frequency input sensitivity: ≥20 mA
• AC frequency measurement error: 0.2% + 0.02H
• Overload protection: Fuse600 mA / 250 V

Dc current

| Measuring range| Resolution| Accuracy
---|---|---|---
60 mA| 0.01 mA| ± (1.0% + 5)
600 mA| 0.1 mA| ± (1.5% + 10)

• Minimum identification current: above 1 mA
• Overload protection: Fuse600 mA / 250 V

Resistance

| Measuring range| Resolution| Accuracy
---|---|---|---
100 Ω| 0.1 Ω| ±(1.3% + 5)
10 kΩ| 0.001 kΩ| ****

±(0.8% + 3)

100 kΩ| 0.01 Ω
1 MΩ| 0.1 kΩ
10 MΩ| 0.001 MΩ| ±(1.5% + 3)
20 MΩ| 0.01 MΩ| ±(2.0% + 10)
Overload protection: 250 V DC / AC RMS

Capacitance

| Measuring range| Resolution| Accuracy
---|---|---|---
100 nF| 0.01 nF| ± (4.0% + 20)
1000 nF| 0.1 nF| ****

± (3.5% + 20)

10 µF| 0.001 µF
100 µF| 0.01 µF
1000 µF| 0.1 µF
1 mF| 0.001 mF
10 mF| 0.01 mF| ****

± (10% + 20)

100 mF| 0.1 mF

• Overload protection: 250 V DC / AC RMS
• Minimum identification capacitance: above 10 nF
• Accuracy measurement range: 10% – 100% of the range
• High capacity response time: ≥1 mF approx. 8s
• The measurement error does not include the wire distribution capacity

Frequency

| Measuring range| Resolution| Accuracy
---|---|---|---
10 Hz – 1 MHz| 0.01 MHz – 0.01MHz| ± (1.0% + 5)

• Overload protection: 250 V DC / AC RMS
• Frequency input amplitude requirements: 100 kHz -10 MHz:
• 3 V RMS≤input amplitude≤20 V RMS
• Maximum display: 999.9 KHz, over range display OL

Continuity test

| Measuring range| Resolution
---|---|---
100 Ω| 0.1 Ω

• When test resistance ≤ 50 Ω the buzzer makes a long sound
• Open-circuit voltage ≤2 V

Diode test

| Measuring range| Resolution| Accuracy
---|---|---|---
10 V| 0.001 V| ± (1.0% + 5)

• Open-circuit voltage: ~3 V
• Short-circuit current: <1.7 mA

Using the Multimeter

Charging description
The device has a built-in lithium battery. If the battery level is low, a low battery symbol will appear, the battery needs to be charged. Regarding the specification of the charging adapter, USB 5 V 600 mA, at least ~2 A is required for proper charging. Connect the Type-C charging cable to the device and then to the charging adapter. The red indicator LED lights up during charging, a green indicator light indicates that the battery is fully charged.

Remark: For safety, do not use the meter while charging, it has a protection setting, the meter will automatically turn off and cannot be used when the charging cable is inserted to charge.

HOLD B/L
Press this button briefly to keep the measurement result on the screen. If the status is active, the symbol appears on the screen. To turn the backlight on/off, press and hold the button for ~2 seconds. (Backlight turns off automatically after 15 seconds)

Warning : To avoid possible electric shock, fire or personal injury, do not use data retention function to measure unknown voltage. When the HOLD function is opened, the LCD will keep the original data when measuring a different voltage.
Briefly press the button to select NCV mode. Long press the button (~2 s) to activate the flashlight on the back.

FUNCTION BUTTON
Briefly press this button to switch between individual measurement functions. (Resistance measurement, diode test, capacitance measurement, DC V, AC V, frequency measurement, automatic identification mode „AUTO”)

Measuring instruction

• First of all, please check if the battery charge is sufficient. If the charge level is not enough, the symbol will appear on the LCD screen and you need to charge the built-in battery. Pay attention to the mark next to the connector of the test leads. This warns that the voltage and current must not exceed the indicated value.
• AUTO” mode can measure resistance (R), continuity, DC V, AC V, DC A, AC A.
• „FUNC” manual mode can measure resistance (R), diode (D), capacitance (C), DC V, AC V, frequency (Freq) and can also do automatic identification (AUTO).

DCV and ACV measurement

• Switch to automatic / manual mode, connect the test leads to the tested circuit. The polarity of the red wire and the measured voltage are shown on the display.
• Insert the black wire into the „COM” socket, the red wire into the socket.
• You can read the measurement result on the display. The main display shows the tested voltage value, the secondary display shows the normal temperature (DC V measurement) and the accompanying frequency (AC V measurement), the measured AC V must be ≥ 50 V for the accompanying frequency.

Useful information

• The LCD shows „OL” if the measured value is outside the measurement range.
• When measuring high voltage (>220 V), personal protective equipment must be worn (for example: Approved rubber gloves, face mask and flame-resistant clothing, etc…) to avoid injuries from electric shock and arcing.
• If the input AC V / DC V voltage exceeds 24 V, the screen will turn red, warning of high voltage.

DCA and ACA measurement

1. You can also use it in automatic mode
2. Plug the black test lead into the „COM” socket, the red one into the „mA/A” socket, then connect the test leads to the power supply voltage or circuit under test.
3. Read the result on the LCD display.

Useful information

• Before connecting the test leads to the power supply or the circuit, first turn off the circuit power, and then check that the input terminal and function range are set correctly.
• The maximum measurement current is 600 mA, alarm is set off when the measurement range is exceeded this.
• Overload or malfunction will trip the fuse and may damage the meter.
• Read the result on the LCD display. The main display shows the tested current value, the secondary display shows the temperature (DCV measurement) and the auxiliary frequency (in the case of ACV measurement)

Resistance measurement

• You can turn on the resistance test function in automatic /manual mode.
• Then connect the test leads to the resistance you want to test.
• Plug the black test lead into the socket and the red one into the socket.
• Read the result on the LCD display.

Useful information:

• The LCD will show „OL” when the resistance exceeds the range. If the measurement resistance exceeds 1 MΩ, the meter may take a few seconds to stabilize. This is normal when testing high resistance.

Capacitance measurement

1. Capacitance measurement can be activated in manual mode. (red cable polarity +)
2. Insert the black test lead into the „COM” socket, the red one into socket
3. Read the result from the LCD display.

Useful information:

1. During capacitance measurement, due to the influence of the distributed capacitance of the line and the instrument, a residual reading may also occur without connection to the measured capacitance, especially when measuring small-range capacitance.
2. To get accurate results, you can subtract the remaining reading from the measurement value to get a more accurate reading.
3. Under high capacity range, if the capacitor is broken or leaking, the LCD will show a variable value and it will be unstable.
4. Burn all capacity before measuring to avoid damage to the meter.
5. UNITS: 1 mF=1000 µF; 1 µF =1000 nF; 1nF=1000 pF

Diode test

1. In manual mode, switch to the diode test function and connect the test leads to the diode under test.
2. Insert the black test lead into the „COM” socket, the red into the socket. (The polarity of the red wire is „+”; The displayed value is the voltage in the diode opening direction. If the test leads are connected in reverse, „OL” will be displayed.

Continuity test

1. In automatic mode, switch to the continuity test function.
2. Plug the black test lead into the „COM” socket, the red into the socket.
3. Connect the test leads to the two points of the tested circuit if the resistance value between the two points is less than approx. 50 Ω, the LCD will show and the built-in speaker will sound.

Live / Phase testing

1. Briefly press the power button and switch to the „LIVE” function
2. Insert the red wire into the connector and touch the measured point with the red test wire.
3. In case of sound and light signal, the measured point is live, phase point. If there is no light and sound, the connected measured line is not live.

Useful information:

1. The range must be set according tot he safety rules!
2. The function only detects AC standard mains power lines (AC 110 – 380 V)

NCV non-contact ACV measurement

1. Briefly press the button.
2. The NCV induction voltage range is 48 V – 250 V, you can use the upper part of the instrument for measurement, near electric field (AC power line, socket, etc.), the NCV induction intensity indicator in the middle of the LCD display is „EF”, and the built-in speaker sounds when the voltage is detected. As the intensity of the detected electric field increases, a line appears on the LCD.

Useful information:

1. If the voltage of the measured electric field is ≥AC 100 V, make sure that the conductor of the measured electric field is insulated to avoid electric shock.

Frequency measurement

1. In manual mode, press the „FUNC” key for the frequency range and the LCD main screen will show FrEq.
2. Plug the black test lead into the „COM” socket and the red one into the VR socket.
3. Read the result on the LCD.

Automatic shutdown function

1. To save battery power, the „APO” auto-off function is already set by default when the instrument is turned on, if there is no operation within 14 minutes, the meter will sound three times to indicate that there is still no operation, the meter will sound for a long time, and it turns off automatically after one minute.
2. Close / open the auto power-off function: Press the NCV button to turn on, the auto-power-off function will be canceled, the LCD will not display the „APO” symbol, after canceling the auto-power-off function, the meter will always be on. A normal reboot will restart the „APO” function.

Maintenance, cleaning

1. This is a factory-calibrated, accurate measuring device. Do not disassemble the device or attempt to modify the electrical circuit. Make sure the measuring instrument is water-, dust-, and shatter-proof.
2. Please do not store or use in high temperature, high humidity, fire or strong magnetic environment.
3. Please wipe the meter with a damp cloth and mild detergent, and do not use abrasive and drastic solvents such as alcohol.
4. When not in use for a long time, please remove the battery to avoid leakage. (Can only be performed by a specialist)
5. When replacing the fuse, use another fuse of the same type and specification. (Can only be performed by a specialist)

Troubleshooting

1. If the meter does not work properly, check the battery level, and if the problem persists, contact the service center or dealer.
2. The manufacturer and distributor shall not take any responsibility for damages resulting from improper, unprofessional use.

Proper disposal of the device (Electrical device)
(Valid in the European Union and all other European states participating in selective collection) According to directives 2012/19/EU, electrical waste and devices cannot be thrown away as household waste. Old devices must be collected in order to maximize the recycling of raw materials, thus reducing their impact on people’s health and the environment. The crossed-out bin symbol is on all products for which separate collection is mandatory. Consumers should check with their local authorities for more information.

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