MX-25521 - Multimeter Maxwell - Free user manual and instructions

Product Type	Bluetooth Multimeter
Brand	Maxwell
Model	MX-25521
Display	LCD, 1999 counts (3 1/2 digit)
Auto Ranging	Yes, with manual override
DC Voltage Range	600 mV to 1000 V
AC Voltage Range	600 mV to 600 V
DC Current Range	600 µA to 10 A (max 15 sec at 10 A)
AC Current Range	60 mA to 600 mA
Resistance Range	600 Ω to 60 MΩ
Capacitance Range	9.999 nF to 99.99 mF
Frequency Range	0.001 Hz to 55 kHz
Temperature Range	-40°C to 1000°C (with type K thermocouple)
Non-Contact Voltage Detection (NCV)	Yes
Non-Contact Frequency Measurement	Yes
Bluetooth Connectivity	Yes, compatible with Android and iOS app
Data Hold	Yes
Backlight	Yes, auto-off after 15 seconds
Auto Power Off	After approx. 5 minutes
Power Supply	1 × 9V battery (6F22)
Dimensions	185 × 95 × 55 mm
Weight	Approx. 435 g
Sampling Rate	Approx. 3 times/second
Continuity Test	Audible below 50 Ω
Diode Test	Yes

Frequently Asked Questions - MX-25521 Maxwell

How do I measure DC voltage?

Connect the black lead to COM and red lead to VΩHz. Set the function switch to V. Press SELECT to choose DC. Connect probes in parallel with the source.

How do I connect test leads for current measurement?

For currents up to 600 mA, connect red lead to mA jack; for up to 10 A, use the 10A jack. Black lead always to COM. Set function switch to the appropriate range (µA, mA, or 10A) and connect in series.

What does "OL" mean on the display?

OL stands for Over Limit. It indicates the measured value exceeds the selected range. Select a higher range or use auto-ranging.

How do I use the Bluetooth feature?

Press and hold the TX button until Tx appears on the display. Download the MAXWELL MULTIMETERS app from Play Store or App Store and pair with the device.

How do I replace the battery?

Turn off the meter and remove the lead. Open the battery compartment on the back. Replace the 9V battery (6F22) and close the compartment.

What is the maximum voltage I can measure?

The maximum voltage is 1000 V DC or 600 V AC. Do not exceed these limits to avoid damage or shock.

How do I enable the backlight?

Press and hold the HOLD button for a few seconds. The backlight turns on and automatically turns off after about 15 seconds.

What is the NCV function?

NCV (Non-Contact Voltage) detects live AC voltage without direct contact. Set the function switch to NCV and bring the top of the meter near the conductor. Red flashing and beeps indicate voltage presence.

How do I perform a resistance measurement?

Connect black lead to COM and red to VΩHz. Set function switch to Ω and press SELECT to choose resistance. Connect probes across the component. For high resistance, wait a few seconds for stabilization.

How do I measure temperature?

Plug the thermocouple (type K) into the COM and VΩHz jacks (observe polarity). Set the function switch to °C/°F (if available, otherwise use a specific position). The display shows the temperature.

USER MANUAL MX-25521 Maxwell

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25521

EN USER MANUAL

DC and AC voltage measurement

Connect the black connector to "COM", the red connector to the "VΩHz" socket. Set the function selector switch to the "V" position. Normally, the automatic metering range switch is active, which is indicated by "AUTO" on the display. Press the "RANGE" button to manually set the measurement range and the "SELECT" button to select the DC and AC modes. Connect the testers in parallel with the power source for the measurement time.

DC and AC current measurement

Connect the black wire to "COM" and the red wire to the "mA" or "10A" socket, max. 600 mA or for max 10A measurements. Set the function switch to the appropriate measuring range, uA, mA or 10A. Normally, the automatic metering range switch is active, which is indicated by "AUTO" on the display. Press the "RANGE" button to manually set the measurement range and the "SELECT" button to select the DC and AC modes. Connect the testers in series to the circuit to be measured.

Frequency and fill factor measurement

Connect the black connector to "COM", the red connector to the "VΩHz" socket. Frequency and fill factor measurement available for the following functions: "V", "uA", "mA", "10A", rotate the function selector switch. Press the "SELECT" button to set the alternating waveform first, then use the "HZ/%" button to select the measurement. Connect the testers in parallel with the power source for the measurement time.

Non-contact frequency measurement

Connect the red connector to the "VΩHz" socket. Turn the function selector switch to the NCF mode and then approach the front of the instrument (NCV/NCF) to 1-2 centimeters to the wire to be measured. The measured value can be read from the display.

Non-contact AC voltage detection

Turn the function selector switch to NCV mode and then approach the front of the instrument (NCV/NCF) to 1-2 centimeters to the wire to be measured. In the case of detection, the display of the instrument flashes red and beeps intermittently. The more often there is a sound and light signal the better the result. The display shows 4 horizontal lines indicating the hit, the higher the value being the more secure.

Resistance, tear and diode, capacity measurement

Connect the black connector to "COM", the red connector

to the "VΩHz" socket. Turn the function selector switch to „Ω → /•|”. Use the "SELECT" button to set the measurement type. For diode measurement, the instrument shows the opening voltage of the diode or "OL" in the closing direction. In case of a break test, the instrument outputs a beeping sound if the measured value is less than 50 ohms. For resistance measurements, wait for a few seconds for measurements of mega ohm while the measured value is stabilized on the display. By pressing the "RANGE" button you can manually select the measuring range, press and hold to return to automatic mode. Before capacitor measurement, discharge the capacitors in any case, otherwise the voltage stored inside them can damage the instrument. For larger capacities, the measurement may take several seconds.

Display maximum and minimum values

After finishing measurements, you have the option of calling the largest, smallest, and different values. Press the "MAX/MIN" button to display the desired value. MAX - maximum, MIN - minimum, MAX-MIN - difference value

Relative measurement method

During measurement, press the "REL" button to activate the relative measurement, the instrument from there uses the previous measurement as a starting point.

Data hold

During measurement, press the "HOLD" button so that the measured value remains on the display even after removing the measuring testers. Press again to reset the measurement.

Backlight

To turn on the backlight, press the "HOLD" button for a long time. It will switch off approx. after 15 seconds, it is automatically turns off.

Automatic switch off

The instrument automatically switches off for approx. after 5 minutes. Press "SELECT" repeatedly to switch on.

Smart mode, wireless Bluetooth connection

The instrument is suitable for storing and displaying measurements on an external device. In any mode of the instrument, press and hold the "TX" button for a long time. The Tx display on the display indicates the activation of the wireless Bluetooth connection.

An app for Android and iOS can be downloaded from Play Market and AppStore: „MAXWELL MULTIMETERS”

SAFETY NOTES

This appliance is manufactured according to the IEC1010 standard (standard safety standards of the International Electrotechnical

Commission). Please read the following safety precautions before use:

• When measuring voltage, never use the unit to measure a value higher than 1000V DC or AC 600V AC.
• Voltage below 36V is safe. Please check grounding, connection, and insulation when you have a direct current greater than 36V or an AC current of more than 25V to avoid electric shock.
• Verify that the test leads are not connected while selecting a function or measuring range.
• The device also has a protective function, but you also need to be careful about your safety.
• When measuring current, make sure that you do not connect higher current to the input than 10A.

GENERAL INFORMATION

Display LCD
Maximum displayed	1999 (3 1⁄2) digit, with automatic polarity change display
Measuring mode	dual integrated A/D change
Sampling approx. 3 /second
Out of measurement range	„ OL”
Operating environment	(0 ~ 40) °C, relative humidity: <80%
Power source 1 pcs 9V battery
Size	185 mm x 95 mm x 55 mm
Weight approx. 435 g
Precision	±(1 % x read data + number)
Outside temperature	23 ± 5°C, Relative humidity: <75%

TECHNICAL INDEX DCV

Range Precision Resolution
600 mV		100 μV
6 V 0,001 V
60 V 10 mV	±(0,6%+2)
600 V 100 mV
1000 V ±(1,0%+2) 1 V

ACV

Range Precision Resolution
600 mV ±(0,6%+3) 100 μV
6 V	±(0,6% +3)	1 mV
60 V 10 mV
600 V ±(0,6% +3) 0,1 V
600 V ±(1,0% +5) 1 V

DCA

Range Precision		Resolution
600 μA	±(0,12% +3)	000,1 μA
6000 μA 1 μA

Maximum current	10 A (For not longer than 15 seconds)
Overload protection	10 A / 1000 V fuse"F" marked 10 A measurement boundary600mA/1000 V fuse"F" marked 600 mA-s measurement boundary

ACA

Range Precision Resolution
60 mA	±(0,15%+5)	0,01 mA
600 mA	0,1 mA

Resistance

Range Precision Resolution
600 Ω ±(0,7%+5) 0.1 Ω
6 KΩ	±(0,6%+2)	0,001 KΩ
60 KΩ 0,01 KΩ	±(0,6%+2)
600 KΩ 0,1 KΩ	±(0,7%+2)
6 MΩ 0,001 MΩ	±(1,5%+5)
60 MΩ	±(2,5%+6)	0,01 MΩ

Important note:

- In the range of 600 Ω, close the two instrument lines without any resistance to be measured, read the result from the display, and then subtract the value from the value displayed by the instrument to be measured. (This is needed because the instrument strings also have resistance and you get the most accurate value after the above subtraction). Failure to display the value for 10 seconds is normal when the measured resistance is greater than 1MΩ. Please wait this is normal for large MΩ components.

Capacity

Range Precision Resolution
9,999 nF ±(5,0%+7) 0,001 nF
9,999 μF ±(5,0%+5) 0,001 μF
99,99 μF ±(10,0%+10) 0,01 μF
9,999 mF ±(10,0%+10) 0,001 mF
99,99 mF ±(10,0%+10) 0,01 mF

Temperature

Range Precision Resolution
-40 °C - 1000 °C	-40°C - 0°C	1 °C±(2,0% +2°C)	±(3,0% +5°C)
	1°C - 250°C
-40 °C - 1000 °C	-40°F - 32°F	1 °F	±(3,0% +5°F)
	33,8°F - 482°F		±(2,0% +2°F)

Frequency

Range Precision Resolution
0,001 – 55 kHz ± 1,5% ± 3 digits 0,0001 Mhz

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