MX-25108 - Multimeter Maxwell - Free user manual and instructions

Product Type	Digital Multimeter
Brand	Maxwell
Model	MX-25108
Display	3½ digits, 7 segments, large LCD (27 × 60 mm)
Function Selection	Rotary switch with OFF position
DC Voltage Ranges	200mV, 2000mV, 20V, 200V, 300V
AC Voltage Ranges	200V, 300V (45-450Hz)
DC Current Ranges	2000µA, 20mA, 200mA, 5A
Resistance Ranges	200Ω, 2000Ω, 20kΩ, 200kΩ, 2000kΩ
Diode Test	Yes, displays forward voltage in mV
Continuity Test	Audible beep below 30 ± 20 Ω
Transistor hFE Test	Yes, for NPN and PNP (IB=10μA, VCE=2.8V)
Logic Test	Yes, output ~5V p-p at 50kΩ impedance
Power Supply	9V battery (not included)
Fuse Protection	500mA/500V and 5A/500V
Overload Protection	Up to 300V DC or RMS AC on all ranges
Input Connectors	5A (unfused), VΩmA, COM
Safety Warning	Do not measure voltage exceeding 300V; remove test leads before opening device
Maintenance	Replace battery when low battery symbol appears; replace fuse if blown
Accessories	Not specified

Frequently Asked Questions - MX-25108 Maxwell

How do I measure DC voltage with the MX-25108?

Connect the red test lead to the VΩmA connector and black to COM. Set the rotary switch to the desired DCV range. If voltage is unknown, start with the highest range and reduce until a proper reading is obtained.

How do I measure AC voltage?

Connect the red test lead to the VΩmA connector and black to COM. Set the rotary switch to the ACV position (200V or 300V). The device measures average, calibrated to RMS sine wave. Frequency range is 45-450Hz.

How do I measure DC current?

For current up to 200mA, connect red lead to VΩmA and black to COM, set switch to DCA range. For 200mA to 5A, connect red lead to the 5A connector. Connect the meter in series with the circuit. For 5A range, limit measurement to 15 seconds with a pause between readings.

How do I measure resistance?

Connect red lead to VΩmA and black to COM. Set the switch to the desired Ω range. Connect the test leads across the resistor. For accurate readings, ensure the circuit is de-energized.

How do I test a diode?

Set the rotary switch to the diode symbol (→). Connect red lead to VΩmA and black to COM. Connect red to the anode and black to the cathode. The display shows the forward voltage in mV. A reverse connection shows '1'.

How do I perform a continuity test?

Set the switch to the continuity symbol (sound wave). Connect red lead to VΩmA and black to COM. Place the probes across the circuit. The meter beeps if resistance is below 30 ± 20 Ω.

How do I test a transistor's hFE?

Set the switch to hFE position. Insert the transistor into the appropriate NPN or PNP socket, matching the base, emitter, and collector. The display shows the hFE value at I_B=10μA and V_CE=2.8V.

How do I use the logic test?

Set the switch to the logic test position (LL). Connect the test leads to VΩmA and COM. The meter outputs approximately 5V p-p at 50kΩ impedance to test logic levels.

How do I replace the battery?

When the low battery symbol appears, turn off the meter and remove the test leads. Remove the two screws on the bottom of the battery compartment. Replace the old 9V battery with a new one, observing polarity. Reattach the cover and screws.

What is the maximum voltage I can measure with the MX-25108?

The maximum voltage you can safely measure is 300V DC or 300V RMS AC. Exceeding this may cause electric shock or damage the meter.

USER MANUAL MX-25108 Maxwell

digiTal mUlTimeTeR digiTal-mUlTimeTeR digiTáliS mUlTimÉTeR mUlTimeTRU digiTal digiTáINy mUlTimeTeR

Product code / Produktcode / Termékkód / Cod produs / Kód produkta: 25108

GENERAL CHARACTERISTICS

This 3½ digit multimeter is perfect for measuring DC and AC voltage, DC current, resistance and diode. It also has a continuity function and can be used as a logical tester. It is ideal for work and home use as well.

THE FRONT PANEL

1. Display

3½ digits, 7 segments, large LCD (27 × 60 mm)

2. Function and range switch

This switch selects the functions and the desired range. It also turns the device on. To prolong battery life set it to OFF when you are not using the device.

3. "5A" banana (wire) connector

Connect the red (positive) measuring wire into this connector to measure 10A current.

4. "VΩmA" banana connector

Connect the red measuring wire into this

connector to measure every kind of voltage, resistance and current (except for 5A)

5. "COM" banana connector

Connect the black (negative) measuring wire here.

TECHNICAL DATA

DC voltage

Range Resolution Accuracy
200mV 100uV ±0.5% +3D
2000mV 1mV	±1.0% +5D20V 10m2
200V 100mV
300V 1V ±1.2% +5D
Overload protection	220V RMS AC at200mV range, és300V DC or 300V RMSon every range

AC voltage

Range Resolution Accuracy
200V 100mV	±1.2% +10D
300V 1V
Reaction	Average, calibrated on the RMS of the sine wave
Frequency range 45Hz	~ 450Hz
Overload protection	300V DC or 300V RMS on every range

Continuity test with audio signal

Range	Description
	A built-in beepersignals if theresistance is below 30 ± 20
Overload protection	15 seconds maximum220V RMS

DC current

Range Resolution Accuracy
2000μA 1μA	±1.8% +2D
20mA 10μA
200mA 100μA ±2% +2D
5A 10mA ±2% +10D
Overload protection	500mA 500V fuse (5A 500V)
Measuring voltage fallback	200mV

Resistance

Range Resolution Accuracy
200Ω 100mΩ ±1.0% +10D
2000Ω 1Ω ±1.0% +2D
20KΩ 10Ω ±1.0% +2D
200KΩ 100Ω ±1.0% 2D
2000KΩ 1KΩ ±1.0% +2D
Max. open circuit voltage	3.0V
Overload protection	15 seconds maximum 220V RMS

OPERATION

WARNING

To avoid electric shock and damage to the device do not measure voltage exceeding 300V! Always verify the intactness and insulation of

the measuring wires, connectors and other units before measuring!

DC and AC voltage measuring

connector and the black one to the "COM" connector.

desired voltage position. If the voltage is unknown, set the switch to the highest available range, connect the wires to the device and the circuit and reduce the range until the value shown is correct.

DC current measuring

connector and the black one to the "COM" connector. (For measuring current between 200mA and 5A connect the red wire into the "5A" connector).

position

serially.

use only. The measuring wire should only be connected to the circuit for the maximum of 15 seconds and allow a few seconds in between measurements.

Resistance measuring

connector and the black one to the "COM" connector.

position.

Diode measuring

connector and the black one to the "COM" connector.

→"position.

of the measured diode and the black one to the cathode.

the screen in mV-s. If the diode is closing, the screen shows "1".

Transistor hFE measuring

the base, the emitter and the collector to the respective hFE connectors.

for the base current's 10μA and V _CE 2,8V state.

Continuity test with audible signal

connector and the black one to the "COM" connector.

position.

the circuit. If the resistance is below 30 ± 20 , the device beeps.

Logical test

J J" position.

for the "VΩmA" and "COM" connectors. The outward voltage is appr. 5V p-p with 50KΩ impedance.

MAINTENANCE

Replacing the battery and the fuse

of the fuse is a result of misuse almost every time.

“” symbol appears on the screen, the battery needs to be replaced.

the 2 screws from the bottom of the battery container and replace the old ones to new ones with paying attention to the polarity.

WARNING!

To avoid electric shock make sure that the measuring wires are removed from any circuits before opening the device!

Accessories

ALLGEMEINE FUNKTIONEN