MX-25328 - Multimeter Maxwell - Free user manual and instructions

Type	Digital Multimeter
Brand	Maxwell
Model	MX-25328
Display	LCD, 3.5 digits (2000 counts)
AC Voltage Range	200mV, 2V, 20V, 200V, 600V
DC Voltage Range	200mV, 2V, 20V, 200V, 600V
DC Current Range	200μA, 2mA, 20mA, 200mA, 10A
Resistance Range	200Ω, 2kΩ, 20kΩ, 200kΩ, 2MΩ, 20MΩ
Continuity Test	Yes, with buzzer
Diode Test	Yes
Battery Test	1.5V and 9V batteries
Transistor Test	No
Capacitance Measurement	No
Frequency Measurement	No
Temperature Measurement	No
Data Hold	Yes
Backlight	No
Auto Ranging	No
Overload Protection	Yes, on all ranges
Power Supply	9V battery (6F22 or equivalent)
Dimensions	126 x 70 x 27 mm (approx.)
Weight	170 g (including battery)
Safety Rating	CAT II 600V
Accessories Included	Test leads, battery, user manual
Cleaning	Use a damp cloth; no solvents

Frequently Asked Questions - MX-25328 Maxwell

How to measure DC voltage with the Maxwell MX-25328?

Set the rotary switch to the DC voltage range (V⎓). Connect the black lead to COM and red lead to VΩmA. Touch the probes to the circuit in parallel. Read the value on the LCD.

How to measure AC voltage?

Turn the dial to AC voltage range (V~). Connect leads as for DC. Ensure the circuit is de-energized before connecting. Read the RMS value.

How to measure resistance?

Set the dial to Ω range. Disconnect power from the circuit. Connect the probes across the resistor. Read the value.

How to test continuity?

Set the dial to the continuity symbol (sound wave). Connect the probes to the two points. If resistance is low (typically <30Ω), the buzzer will sound.

What does the battery test function do?

It allows testing 1.5V and 9V batteries under load. Select the appropriate range (1.5V or 9V) and connect the probes to the battery terminals. A good battery shows a voltage near its rated value.

How to replace the battery?

Turn off the meter and remove the test leads. Remove the screw on the back cover. Lift the cover and replace the 9V battery. Close the cover and tighten the screw.

What does 'OL' mean on the display?

OL stands for Over Load. It means the measured value exceeds the selected range. Switch to a higher range or check the circuit for overvoltage.

Is the Maxwell MX-25328 safe for mains voltage?

Yes, it has a CAT II 600V safety rating, suitable for measuring household mains voltage. However, always follow safety precautions and do not exceed the rated voltage.

How to clean the multimeter?

Use a soft cloth slightly dampened with water or mild detergent. Do not use abrasive cleaners or solvents. Ensure the meter is dry before use.

What is the maximum current rating?

The meter can measure up to 10A DC for short periods (less than 10 seconds) with a 15-minute rest interval between measurements. Use the 10A jack for currents above 200mA.

USER MANUAL MX-25328 Maxwell

Product code / Produkt code / Termékkód / Cod produs / Kód produkta:

25328

SAFETY INFORMATION

This instrument is designed and tested according to IEC Publication 1010-1 (61010-1 IEC: 2001), Cat II (1000V), Cat III (600V) and Cat IV overvoltage standards. Before using this Meter, read and follow the safety information. To get the best service from this Meter, read carefully this user's manual and respect the detailed safety precautions. If the meter or test leads are damaged, change them immediately.

SAFETY WARNINGS

When using the instrument, the user must observe all normal safety rules:

• Protect yourself against the danger of electric shock.
• Protect the instrument against misuse.
• Only use the test probes supplied with the instrument. Before use, check that they are in good condition. Never use the instrument if any of the parts are damaged.
• If the Meter is used near noise generating equipment, be aware that display may become unstable, indicate large errors or nothing can be seen on the instrument's screen.
• Use the meter only as specified in this manual; otherwise, the protection provided by the meter may be impaired. Hereafter, misuse can cause damage or error.
• Do not use the Meter around explosive gas, vapour or dust.
• Verify the instrument's operation by measuring a known voltage. Do this process before every usage, because the formerly applied protection may be impaired.
• When the range of the value to be measured is unknown, check that the range initially set on the multimeter is the highest possible or, wherever possible, choose the auto-ranging/ automatic ranging mode.
• In order to avoid damages to the instrument, do not exceed the maximum limits of the input values.
• Caution when working with voltages above 60Vdc or 30Vac rms. Such voltages can cause electric shock.
• When using the probes, keep your fingers

away from probe contacts and behind the finger guards.

• Before changing functions, disconnect the test leads from the circuit under test.
• For all DC functions, including manual or auto-ranging, to avoid the risk of shock due to possible improper reading, verify the presence of any AC voltages by first using the AC function. Then select a DC voltage range equal to or greater than the AC range.
• Before measuring current, turn off power to the circuit before connecting the Meter to the circuit.
• Replace the batteries as soon as the low battery indicator appears.
• Remove test leads from the instrument and from the circuit as well, before opening the Meter case.
• If the instrument is not going to be used for a long time, take out the battery and do not store the Meter in high temperature or high humidity environment.
• To avoid damage to the Meter or any injury always use the standard fuse parameters in case of any changing: F 500mA/250V, F 10A/600V.
• Never use the instrument if the cover of the battery case on the backside is open or unfit.

GENERAL FEATURES

1. Display

2. REL button

3. RANGE button

4. Hz/Duty button

5. HOLD button

6. RS232 button (PC-link)

7. SELECT button

8. Function selection button

9. "10A" connector

10. "mA" connector

11. "COM" connector

12. "VΩHz" connector

FUNCTIONS

Hold (key)

Short press fixes the display on the current value. A second short press returns the Meter to normal mode.

Range (key)

This key switches between auto-range mode and manual mode. If you Press RANGE key for 2 sec, the Meter enters the manual ranging mode. Auto-range mode turns off.

To exit the manual ranging mode, press and hold down RANGE key for two seconds. The Meter returns to the auto-range mode and AUTO is displayed.

Battery Saver Mode

The instrument enters to "sleep mode" automatically if the Meter is on but not used for 30 minutes. Press the "HOLD/LIGHT" key or rotate the rotary switch to wake the meter up.

REL (key)

To enter and exit relative measurement mode, press the REL key until you hear "pips" that indicates you that the relative measurement mode is switched on. The instrument stores the measured value if you press the key. With the Meter in the desired function, touch the test leads to the circuit on which you want future measurement to be based. After the measurement you will check the total value on the screen. Press REL key for more than 2 seconds to return the Meter to normal operation. This function cannot work in Frequency Measurement Mode.

MEASUREMENT

Voltage Measurement

To measure AC or DC voltage:

1.: Set rotary switch to the "V or DCmV" range.

2.: Select the "AC or DC" range by the "SWITCH" key.

3.: Connect the black test lead to the "COM" terminal and the red test lead to the "VΩHz" terminal.

4.: Connect the test leads to the circuit being measured.

5.: Read the displayed value on the screen. The polarity of red test lead connection will be indicated when making a DCV measurement.

Warning: To avoid electrical shock and/or damage to the instrument, do not attempt to take any voltage measurement that might exceed 1000V DC or 1000V AC RMS.

Resistance Measurement

To measure resistance:

1.: Set the rotary switch to the "Ω" range.
2.: Connect the black and red test leads to the "COM" and "VΩHz" terminals.
3.: Connect the test leads to the circuit being measured.
4.: Read the displayed value on the instrument's screen.

NOTE: On 40MΩ range, the meter may take a few seconds to stabilize reading. This is normal for high resistance measuring. The sign "OL" will be displayed on the over-range condition.

Warning: To avoid electrical shock and/or damage to the instrument, disconnect circuit power and discharge all high-voltage capacitors before measuring resistance

Diode Test

To test a diode out of a circuit:

1.: Set the rotary switch to "Ω" range.
2.: Press the "SELECT" key once to activate Diode Test.
3.: Connect the black and red test leads to the "COM" and "Ω" terminals.
4.: Place the red test lead on the component's anode and place the black test lead on the component's cathode.
5.: The meter will show the approx. forward voltage of the diode. The sign "OL" will be displayed on a reverse and changed condition.

Warning: To avoid electrical shock and/or damage to the instrument, disconnect circuit power and discharge all high-voltage capacitors before testing diodes.

Capacitance Measurement

To measure capacitance:

1.: Set the rotary switch to "—|—" range.
2.: Connect the black and red test leads to the "COM" and "Ω" terminals.
3.: Connect the test leads to the capacitor being measured and read the displayed value on the screen.

Warning: To avoid electrical shock and/or damage to the instrument, disconnect circuit power and discharge all high-voltage capacitors before measuring capacitance.

NOTE: The meter may take a few seconds (e.g.: 200 F range 30 seconds) to stabilize reading. This is normal for high capacitance measuring. To improve the accuracy of measurements less than 50nF, subtract the residual capacitance of the Meter and leads.

Frequency and Duty Cycle Measurement

1.: Set the rotary switch to "Hz" range.
2.: Connect the black and red test leads to the "COM" and "Ω" terminals.
3.: Measure AC voltage or AC amperage.
4.: To make a Duty Cycle Measurement, press the "Hz/DUTY" key.
5.: Read the displayed value on the screen in %. NOTE: It is preferable to use shield cable for measuring small signal for the best measurement.

Temperature Measurement

1.: Set the rotary switch to "°C" range!
2.: Connect the K type temperature measuring sensor to the instrument, and connect the red test leads to the "mA" terminal, the black to the "COM" terminal. (TEMP. terminals +-)
3.: Place the temperature probe to the object or environment being measured. The measured value can be seen on the display.

Warning: To avoid electrical shock and/or damage to the instrument, never place the sensor to electric environment and do not measure in microwaves.

Current Measurement

To measure current:

1.: Turn off the power to the circuit. Discharge all high voltage capacitors.
2.: Set the rotary switch to the " A, mA or A" range.
3.: Press the "SELECT" key to select "DC or AC" measuring mode.
4.: Connect the black test lead to the "COM" terminal and the red test leads to the "mA" terminal for a maximum of 400mA. For a maximum of 10A, move the red test lead to the "A" terminal.
5.: Break the circuit path to be tested. Touch the black probe to the more negative side of the

break (COM); touch the red probe to the more positive side of the break (mA). (Reversing the leads will give a negative reading, but will not damage the Meter.)

6.: Turn on power to the circuit; then read the display. Be sure to note the measurement units at the right side of the display ( A, mA or A). When only the figure "OL" displayed, it indicates over-range situation and the higher range has to be selected.
7.: Turn off power to the circuit and discharge all high voltage capacitors. Remove the Meter and restore the circuit to normal operation.

Warning: To avoid electrical shock and/or damage to the instrument, disconnect circuit power and discharge all high-voltage capacitors before current measurement.

PC Link

The instrument is equipped with an optical isolated interface port (USB) for data communication. An optional PC interface kit is required to connect the meter to the computer with which the data analysis can be easily accessible on the PC. Before connecting the instrument to the computer, you need to install the Maxwell PC-Link program from the attached CD to your PC.

You can activate the connection by pushing the "RS232" key after switching on the meter when the RS232 appears on the screen.

TECHNICAL SPECIFICATIONS

Environment Conditions	1000V CAT II. and 600V CAT IV.
Operating Temperature	0°C - 40°C (<80% RH)
Storage Temperature	-10°C - 60°C (<70% RH)
MAX. Voltage between terminals and earth ground	750V AC RMS or 1000V DC
Fuse Protection	μA and mA - F 500mA/250V ∅5x20 és F 10A/600V ∅6x30

Sample Rate	3 times/sec for digital data
Display	4 digits LCD display. Automatic indication of functions and symbols.
Range Selection	Automatic and Manual
Over Range Indication	LCD will display “OL”
Low Battery Indication	“-” will display
Polarity Indication	“-” displayed automatically
Power Source and Battery Type	2 x AAA 1,5V
Dimensions 185 x 85 x 40 mm
Weight	310 g (battery included)

MEASUREMENT SPECIFICATIONS

Accuracy is specified for one year after calibration, at operating temperatures of 18 °C to 28 °C, with relative humidity at 0% to 75%. Accuracy specifications take the form of: ± (% of Reading + Number of Least Significant Digits.

DC Voltage (DCV)

Range Accuracy Resolution
400mV	±(0.5%+4d)	0.1mV
4V 1mV
40V 10mV
400V 100mV
1000V ±(1.0%+6d) 1V

Input Impedance: 10MΩ

MAX. Input Voltage: 1000V DC or 750V AC RMS

AC Voltage (ACV)

Range Accuracy Resolution
400mV ±(1.6%+8d) 100μV
4V		1mV
40V 10mV ±(0.8%+10d)
400V 100mV
750V ±(1.0%+10d) 1V

Input Impedance: 10MΩ

MAX. Input Voltage: 1000V DC or 750V AC RMS

Frequency Range: 40-200Hz

DC Current (DCA)

Range Accuracy Resolution
400uA	±(1.0%+10d)	0.1μA
4000uA 1μA
40mA 10μA
400mA 100μA
4A	±(1.2%+10d)	1mA
10A 10mA

Max. Input Current: 10A (max. 15 sec)

Overload Protection: 0.5A/250V fuse for "uA/mA" range, 10A/250V fuse for "A" range.

AC Current (ACA)

Range Accuracy Resolution
400uA	±(1.5%+10d)	0.1μA
4000uA 1μA
40mA 10μA
400mA 100μA
4A	±(2.0%+15d)	1mA
10A 10mA

Max. Input Current: 10A (max. 15 sec)

Overload Protection: 0.5A/250V fuse for "uA/mA" range, 10A/250V fuse for "A" range.

Frequency Range: 40-200Hz

Resistance (Ω)

Range Accuracy Resolution
400Ω ±(0.8%+5d) 0.1Ω
4KΩ	±(0.8%+4d)	1Ω
40KΩ 10Ω
400KΩ 100Ω
4MΩ	±(1.2%+10d)	1KΩ
40MΩ		10KΩ

Open Circuit Voltage: 400mV

Overload Protection: 250V DC/AC RMS

NOTE: In order to ensure the best accuracy in measurement of low resistance, short the test leads before measurement and memory the test probe resistance in mind. This necessary to subtract for the resistance of the test leads.

Capacitance (C)

Range Accuracy Resolution
50nF	±(5.0%+30d)	10pF
500nF	±(3.0%+10d)	100pF
5uF		1nF
50uF		10nF
100uF	±(5.0%+10d)	100nF

Overload Protection: 250V DC/AC RMS

Before measuring capacitance, discharge all high-voltage condensators.

Frequency and Duty Cycle

Range Accuracy Resolution
4Hz	±(0.5%+4d)	0.001Hz
40Hz 0.01Hz
400Hz 0.1Hz
4kHz		1Hz
40kHz 10Hz
400kHz		100Hz
4MHz		1kHz
30MHz		10kHz
0.1 ~ 99.9%	-	0.1

Input Voltage Range: 0.7V RMS

Overload Protection: 250V DC/AC RMS

NOTE: for high measurement set the rotary switch to ACV range then push the "HZ/Duty" key to switch between functions.

Temperature (°C)

Range Accuracy Resolution
-20°C ~ 400°C	±(1.0% + 5 °C)	0.1 °C
400°C ~ 1000°C	±(1.5% + 15°C)	1°C

Overload Protection: 0.5A/250V fuse

Diode and Continuity Test

Range Pontosság Leírás
Diode 1 mV Open Circuit	Voltage: 0.5~0.8V
Continuity 0.1Ω	Open Circuit Voltage:0.45V, continuity beeper max. to 70Ω (±30Ω)

MAINTENANCE

Periodically wipe the case with a damp cloth and mild detergent. Do not use abrasives or solvents. Dirt or moisture in the terminals can affect readings.

To clean the terminals:

• Turn the meter off and remove all test leads.
• Shake out any dirt that may be in the terminals.
• Soak a new swab with a cleaning and oiling agent.
• Work the swab around in each terminal.
  The oiling agent insulates the terminals from moisture-related contamination.

Warning: To avoid electrical shock or damage to the meter, do not get water inside the case.

FUSE REPLACEMENT

To replace the Meter's fuse:

1. Set rotary switch to the "OFF" position.
2. Disconnect test leads and/or any connectors from the terminals.
3. Use a screwdriver to unscrew the four screws secured on the battery cover.
4. Take out the battery's back cover from the meter.
5. Remove the fuse by gently prying one end loose, then sliding the fuse out of its bracket.
6. Install the replacement fuses only with specified ratings: F 10A/250 V 0 6 × 30F 500mA/250V 05x20
7. Rejoin the battery cover and secure by the screws.

Warning: To prevent damage or injury, replace the fuse only with specified ratings.

Battery Replacement

Replace the battery as soon as the battery indicator appears on the screen to avoid false readings.

To replace the battery:

1. Set the rotary switch to the OFF position.
2. Disconnect test leads from the terminal.
3. Take out the battery's back cover from the meter.
4. Remove the used batteries.
5. Replace the used batteries with two new 1,5V batteries (AAA).
6. Rejoin the battery cover and secure by the screws.

BIZTONSÁGI INFORMÁCIÓ

Current maxim: 10A (max. 15 sec).

Domeniu Precizie Rezoluție
50nF ±(5.0%+30d) 10pF
500nF	±(3.0%+10d)	100pF
5uF 1nF
50uF 10nF
100uF ±(5.0%+10d) 100nF