MX 350 - Multimeter METRIX - Free user manual and instructions

Product type	AC TRMS clamp multimeter
Model	MX 350
Brand	Metrix (Chauvin Arnoux)
Dimensions (L x W x H)	199 x 75 x 36 mm
Weight (with batteries)	243 g
Power supply	2 batteries 1.5 V AAA / LR03
Battery life	Approximately 200 hours
Display	LCD 6000 counts
TRMS measurement	Yes, up to 1 kHz
Main functions	AC voltage, DC voltage, AC current, resistance, continuity test with beeper, frequency (voltage and current), HOLD function, auto power off, dangerous voltage indication
Safety category	600 V CAT III
Protection rating	IP30
Max jaw opening	26 mm
Operating temperature	0 °C to +40 °C
Storage temperature	-10 °C to +60 °C
Relative humidity	< 70 % RH
Warranty	24 months
Maintenance and cleaning	Clean with a soft cloth slightly dampened with soapy water, rinse and dry
Spare parts and repairability	Only batteries are user-replaceable; any other intervention must be carried out by qualified personnel
Compliance standards	IEC 61010-1, IEC 61010-2-032, IEC 61010-031, IEC 61326-1

Frequently Asked Questions - MX 350 METRIX

How to measure DC voltage with the MX 350?

Set the switch to the V (DC) position. Connect the red lead to the + terminal and the black lead to the COM terminal. Apply the test probes to the points to be measured. Read the value on the display. If the voltage exceeds 30 V DC, the danger symbol flashes.

How to measure AC current with the clamp?

Set the switch to A (AC). Open the clamp by pressing the trigger and place it around a single conductor. Close the clamp and read the measurement. For optimal results, center the conductor in the jaws.

How to test continuity of a circuit?

Turn the switch to the ·s (continuity test) position. Connect the red (+) and black (COM) leads to the ends of the circuit. If the resistance is less than approximately 40 Ω, a continuous beep sounds.

How to use the HOLD function?

Press the HOLD button to freeze the displayed value. Press again to release the value. The HOLD symbol is shown on the screen when the function is active.

How to enable or disable auto power off?

Auto power off is enabled by default after 20 minutes of inactivity. To disable it, hold down the HOLD button before turning on the device. The auto power off symbol then disappears.

What does the 'OL' display mean?

'OL' (Over Limit) indicates that the measurement exceeds the device's capacity. For example, for voltage, 'OL' appears above 630 V RMS. A repetitive beep may also sound to signal an exceedance of the safety voltage.

How to replace the batteries?

Set the switch to OFF and disconnect the leads. Unscrew the screw of the battery compartment at the back. Replace the two batteries of type 1.5 V AAA/LR03 respecting polarity. Screw the compartment back.

What is the safety category of the MX 350?

The MX 350 is designed for use in category III up to 600 V with respect to earth. It has double insulation (class II) and is protected against overvoltages.

How to clean the clamp multimeter?

Disconnect all connections and set the switch to OFF. Use a soft cloth slightly dampened with soapy water. Rinse with a damp cloth and dry quickly with a dry cloth or compressed air. Do not use alcohol or solvents.

What is the warranty of the MX 350?

The warranty is 24 months from the date of availability of the equipment, unless otherwise stated. It does not cover damage due to improper use, unauthorized modifications, shocks, or floods.

USER MANUAL MX 350 METRIX

Technical line drawing of a remote control device with battery pack and housing (no text or symbols)

Diagram of a digital multimeter connected to a power supply with labeled components and measurement scale

Diagram showing a multimeter connected to three electrical components with labeled terminals and wiring connections

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Diagram showing two identical analog multimeters connected to a digital display, with Chinese labels indicating measurement ranges.

I 50.0 10Ω 14Ω HOLD OFF 10Ω 14Ω TIMES

1.1. Precautions and safety measures . 17
1.1.1. Symbols ...... 17
1.1.2. Definitions of the measurement cat.17

2. INSTRUMENT OVERVIEW 18

2.1. Delivery condition 18
2.2. Functions ...... 18
2.3. Device description 19
2.4. Display 19

3. USE 20

3.1. Precautions for use.... 20
3.2. First use 20
3.3. Measuring AC voltage 21
3.4. Measuring DC voltage 21
3.5. Measuring AC current 22
3.6. Measuring DC current 22
3.7. Measuring resistance 23
3.8. Continuity test with buzzer ..... 23
3.9. Check of frequency in voltage mode24
3.10. Check of frequency in current mode24
3.11. Zero mode/"Delta" function ..... 25
3.12. Storage 25
3.13. "Peak" function 25
3.14. Auto-shutdown 25

4. TECHNICAL SPECIFICATIONS ...... 25

4.1. Reference conditions ..... 25
4.2. Specifications 25

4.2.1. DC voltage 25
4.2.2. AC voltage 26
4.2.3. DC current 26
4.2.4. AC current 26
4.2.5. Resistance 26
4.2.6. Continuity 26
4.2.7. Frequency (for current) 26
4.2.8. Frequency (for voltage) 27

5. GENERAL SPECIFICATIONS ...... 27

5.1. Digital display 27
5.2. TRMS measures 27
5.3. Environmental conditions ..... 27
5.4. Power supply 27
5.5. Mechanical features ...... 27
5.6. Compliance with international standards 27
5.7. Safety 27

6. MAINTENANCE 28

6.1. Cleaning 28

7. WARRANTY 28

1. GENERAL INSTRUCTIONS

Thank you for purchasing a MX 350/MX 355. For best results from your current clamp:

• read this user manual carefully,
• comply with the precautions for use.

1.1. Precautions and safety measures

This device is compliant with safety standard IEC 61010-2-032, the leads are compliant with IEC 61010-031 for voltages up to 600 V in category III.

Failure to observe the safety instructions may result in electric shock, fire, explosion, or destruction of the instrument and of the installations.

1.1.1. Symbols

WARNING, DANGER! The operator should refer to this user's manual whenever this danger symbol appears.

Earth.

Equipment protected throughout by double or reinforced insulation.

Application or withdrawal authorized on bare conductors carrying dangerous voltages. Type A current sensor as per IEC 61010-2-032.

The rubbish bin with a line through it indicates that, in the European Union, the product must undergo selective disposal in compliance with Directive WEEE 2002/96/EC. This equipment must not be treated as household waste

The CE marking indicates conformity with European directives, in particular LVD and EMC.

Battery

Alternating current.

Direct current

AC or DC

Important instruction

1.1.2. Definitions of the measurement categories

Measurement category IV corresponds to measurements taken at the source of low-voltage installations.

Example: power feeders, meters and protection devices.

Measurement category III corresponds to measurements on building installations.

Example: distribution panel, circuit-breakers, machines or fixed industrial devices.

Measurement category II corresponds to measurements taken on circuits directly connected to low-voltage installations.

Example: power supply to domestic electrical appliances and portable tools.

2. INSTRUMENT OVERVIEW

2.1. Delivery condition

Check completeness of the delivery against your order.

• Multilingual user manual on paper
• 1 set of measurement leads (one black and one red)
• 2 1.5V AAA or LR3 batteries
• 1 carrying bag
• 1 test certificate

2.2. Functions

The MX 350 and MX 355 are clamp-on multimeters measuring electrical and physical quantities and grouping the following functions:

Functions	MX350	MX355
Measuring AC voltage	●	●
DC voltage measurement	●	●
Measuring AC current	●	●
Measuring DC current		●
Measuring resistance	●	●
Continuity test with buzzer	●	●
Measurement of the voltage frequency	●
Measurement of the current frequency	●
Zero mode/"Delta" function		●
“Peak” function		●
Auto range	●	●
Auto stop	●	●
Storage	●	●
Hazardous voltage warning	●	●

2.3. Device description

MX 350 HOLD CE OFF Hz TRMS 8 7 1 2 3 4 5 6 HOLD PEAK ZERO OFF +Ω TRMS 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40

1	Jaws
2	HOLD/Peak function
3	Δ zerc function (only MX 355)
4	Switch
5	Display
6	Input terminal +
7	Common terminal
8	Trigger
9	Guard

2.4. Display

1 2 3 4 5 6 13 ≈ 0.8.8.8 kHz 12 -8.8.8 A 11 h HOLD Ω 7 10 9 8

1	Auto stop activated
2	zero function (only MX 355)
3	Peak function (only MX 355)
4	Continuity mode
5	K decimal prefix (only MX 350)
6	Hz (frequency) (only MX 35C)
7	A, V or (Ampère, Volt or Ohm)
8	Digital display
9	HOLD function. The value is frozen.
10	Low battery
11	Presence of hazardous voltage
12	Negative value
13	DC or AC mode

3.1. Precautions for use

• The operator and/or the responsible authority must carefully read and clearly understand the various precautions to be taken in use.

• If you use this instrument other than as specified, the protection it provides may be compromised, thereby endangering you.

- Do not use the instrument if it seems to be damaged, incomplete, or poorly closed.

- Before each use, check the condition of the insulation on the leads, housing, and accessories. Any item of which the insulation is deteriorated (even partially) must be set aside for repair or scrapping.

• The safety of any system in which this device is incorporated is the responsibility of the system integrator.

- Before using your device, check that it is perfectly dry. If it is wet, it must be thoroughly dried before being connected or being operated in any way.

- Use only the leads and accessories supplied. Using leads (or accessories) of a lower voltage or category reduces the voltage or category of the combined instrument + leads (or accessories) to that of the leads (or accessories).

• Use personal protection equipment systematically.

- When handling the leads, test probes, and crocodile clips, keep your fingers behind the physical guard.

• Comply with the environmental conditions of use.

- Do not use the clamp above its rated frequency, since this might cause it to overheat dangerously.

3.2. First use

Place the batteries in the device as follows:

1. Use a screwdriver; unscrew all the battery cover screws on the back of the meter.

2. Place the batteries in the casing, respect polarity.

3. Screw back battery cover screws

Line drawing of a handheld remote control device with battery and switch (no text or symbols)

Before changing the batteries, set the switch to "OFF", disconnect the measuring leads and remove the clamp from the circuit measured.

• Start the clamp-on multimeter; make sure that all segments are displayed.
• Check that on Continuity position, and without any input the meter display OL.
  • Take out both cords and short circuit, the beeper should sound.
• Turn the rotary switch on V and check a known voltage (for example a battery) and make sure voltage is correct.

When all the steps above are correct, you can start to use the meter.

3.3. Measuring AC voltage

2200 switch to ~V

1. Set the switch to
2. Connect the red test lead to the input terminal and the black test lead to the COM input terminal.
3. Apply the probe tips on the points where the AC voltage is to be measured.
4. Read the result on the display unit

In the presence of a hazardous voltage (>30V AC) the blinks on the screen.

3.4. Measuring DC voltage

1200 12V at the switch to

1. Set the switch to

2. Connect the red test lead to the input terminal and the black test lead to the input terminal.

3. Apply the probe tips on the points where the DC voltage is to be measured.
4. Read the result on the display unit

In the presence of a hazardous voltage (>30V DC) the signal blinks on the screen.

3.5. Measuring AC current

Set the switch to ~A

1. Set the switch to
2. Open the clamp by pressing the trigger.
3. Place the clamp around the conductor to be measured and release the trigger; check that the clamp is correctly closed.
4. Read the measurement result on the display unit.

For safety reasons, disconnect the measuring leads before performing this operation. The clamp must be positioned around a single conductor in a circuit, with the risk of rendering the measurement incorrect. The best measurement is obtained with the conductor centred in the middle of the jaws.

3.6. Measuring DC current

(only MX 355)

12V 200° A

1. Set the switch to

2. Open the clamp by pressing the trigger.

3. Place the clamp around the conductor to be measured and release the trigger; check that the clamp is correctly closed.
4. Read the measurement result on the display unit.

For safety reasons, disconnect the measuring leads before performing this operation. The clamp must be positioned around a single conductor in a circuit, with the risk of rendering the measurement incorrect. The best measurement is obtained with the conductor centred in the middle of the jaws.

3.7. Measuring resistance

3500.0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80

1. Set the switch to

1. Connect the red test lead to the input terminal and the black test lead to the COM input terminal.
2. Apply the probe tips on the points where the resistance is to be measured.
3. Read the result on the display unit

3.8. Continuity test with buzzer

Diagram of a digital multimeter with labeled components including power supply, analog meters, and probe connections

Diagram of a digital clamp meter with labeled components and measurement scale

1. Set the switch to

1. Connect the red test lead to the input terminal and the black test lead to the COM input terminal.

2. Apply the probe tips on the circuit to be tested.

3. If the resistance is less than 40 Ω, the buzzer sounds continuously.

3.9. Check of frequency in voltage mode

(only MX 350)

mullie: LAC 1000 500Ω DCM A A + - QF1 V V CE H U U U U U U U U

1. Set the switch to
2. Connect the red measurement lead to the
3. input terminal and the black measurement lead to the GCM output terminal.
4. Apply the probe tips on the points at which the frequency is to be measured.
5. Read the result on the display unit.

3.10. Check of frequency in current mode

(only MX 350) I 50.0

1. Set the switch to
2. Place the clamp around the conductor to be measured and release the trigger; check that the clamp is correctly closed.
3. Read the result on the display unit.

The simultaneous use of the input terminals and of the jaws of the clamp throws off the frequency reading.

3.11. Zero mode/"Delta" function

(only MX 355)

While the 4 button is pressed, the symbol is displayed. The last value measured becomes the reference value that will be subtracted from subsequent measurements. Press the 4 button again to exit from the mode.

3.12. Storage

Pressing the button freezes the value displayed. To deactivate this function, press the button again.

The "peak" function is used for measuring 1 ms peak value in voltage or current. A long press (2 seconds) on the button activates the "peak" function. A second long press deactivates the function.

3.14. Autoshutdown

The clamp switches off automatically after 20 minutes if no operation is performed. After Autoshutdown, it can be turned on by switching to any range, or pressing the HOLD button. It is possible to deactivate this function by holding down the HOLD button before powering up the clamp.

4. TECHNICAL SPECIFICATIONS

4.1. Reference conditions

Temperature + 23 °C ± 5 °C.

Freq. For AC signal 45-65 Hz

Pure AC signal

Electric field < 40 V/m

Magnetic field <1 V/m

4.2. Specifications

An overshoot of the range is indicated by UL on the display unit and by an audible signal.

4.2.1. DC voltage

Display rang	Range	Resolutic	Accurac
60 V	0.05–60.00 \	0.01 \	1%R + 3 ct
600 \	60.0–600.0 \	0.1 \

4.2.2. AC voltage

Display range	Range	Frequenc	Resc	Accuracy
60 V 0.05	-60.00 V	48-65 H;	0.01 V	1.9%R + 5
		65-400 H.		3.8%R + 5
600 V 60.0	-600.0 V	48-65 H;	0.1 V	1.9%R + 5
		65-400 H.		3.8%R + 5

Note: The display indicates "OL" above 630V (900V in peak mode - ONLY MX 355). Above 630V RMS, a repetitive beep indicates that the voltage being measured is greater than the safety voltage for which the device is guaranteed. The display indicates "OL".

4.2.3. DC current

(only MX 355)

Display rang	Range	Resolutio	Accuracy
60 A	0.1C - 60.00 A	0.01	2.5%R + 10 ct
400	60.C - 400.0	0.1

4.2.4. AC current

MX 350

Display range	Range	Frequenc	Resc	Accurac
60 A	0.05–60.00 /	48–65 Hz	0.01 /	1.9%R + 5
		65–400 H:		3.8%R + 5
400 /	60.0(–400.0 /	48–65 Hz	0.1A	1.9%R + 5
		65–400 H:		3.8%R + 5

MX 355

Display range	Range	Frequenc	Resc	Accurac
60 A	0.05–60.00 A	48–65 Hz	0.01 A	1.9%R + 5
		65–400 H:		3.8%R + 5
400 A	60.0–400.0 A	48–65 Hz	0.1A	1.9%R + 5
		65–400 H:		3.8%R + 5

Note: The display indicates "OL" above 420A (600A in peak mode – ONLY MX 355). Above 420A RMS, a repetitive beep indicates that the current being measured is greater than the safety current for which the device is guaranteed. The display indicates "OL".

4.2.5. Resistance

Display range	Range	Resolution	Accuracy
600 Ω	0.2 – 600.0 Ω	0.1 Ω	1%R+ 2ct

4.2.6. Continuity

Detection threshold

≤ 35 Ω typical

4.2.7. Frequency (for current)

(only MX 350)

Displa range	Range Resol Accuracy Sensibility
600 H:	20.(-600.0 H)	0.1 H	0.2%R + 2 ct	3 Arms
6 kHz:	0.60(-6.000 kHz)	0.00 kHz
10 kHz:	6 - 10 kHz	0.0 kHz	0.2%R + 2	3 Arm

4.2.8. Frequency (for voltage) (only MX 350)

Display range	Range	Resc	Accurac	Sensibili
600 H;	10.0–600.0 H	0.1 H	0.1%R + 2ct	5 Vrms
6 kHz;	0.60 –6.000 kHz	0.001 kHz
60 kHz;	6.0C–60.00 kHz	0.01 Hz	0.1%R + 2ct	5 Vrms
100 kHz	60.C–100.0 kHz	0.1 kHz	0.1%R + 2ct	5 Vrms

5. GENERAL SPECIFICATIONS

5.1. Digital display

Display LCD 6000 counts

5.2. TRMS measures

Sampling 2 measurements per second Accuracy True RMS value measured up to 1kHz (-3dB), pass band ≤3.5kHz

Peak factor ≥1.5 full scale

5.3. Environmental conditions

Operation temperature 0°C à +40°C Storage temperature -10°C à +60°C Relative humidity < 70% RH

5.4. Power supply

Battery 2 x 1.5 V AAA or LR03 Battery life MX 350: about 200 hours MX 355: about 40 hours

5.5. Mechanical features

Dimensions 199 x 75 x 36 mm Jaws opening MX 350 26 mm MX 355 30 mm Weight 243 g (avec piles) Protection rating IP30

5.6. Compliance standards with international

Safety IEC 61010-1; IEC 61010-2-032 IEC 61010-2-033; IEC 61010-031 EMC IEC 61326-1

5.7. Safety

Insulation double insulation - class II Degree of pollution 2 Altitude < 2000 m Category CAT III 600 V

6. MAINTENANCE

Except for the batteries, the instrument contains no parts that can be replaced by personnel who have not been specially trained and accredited. Any unauthorized repair or replacement of a part by an "equivalent" may gravely impair safety.

6.1. Cleaning

Disconnect the instrument completely and turn the rotary switch to OFF. Use a soft cloth, dampened with soapy water. Rinse with a damp cloth and dry rapidly with a dry cloth or forced air. Do not use alcohol, solvents, or hydrocarbons. Keep the clamp jaws as clean as possible.

7. WARRANTY

Except as otherwise stated, our warranty is valid for 24 months starting from the date on which the equipment was sold. Extract from our General Conditions of Sale provided on request.

The warranty does not apply in the following cases:

• Inappropriate use of the equipment or use with incompatible equipment;
• Modifications made to the equipment without the explicit permission of the manufacturer's technical staff;
• Work done on the device by a person not approved by the manufacturer;
• Adaptation to a particular application not anticipated in the definition of the equipment or not indicated in the user's manual;
• Damage caused by shocks, falls, or floods.

Line drawing of a handheld electronic device with battery and switch (no text or symbols)

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Diagram of a digital multimeter connected to a power supply with labeled components and a digital display showing 2200Ω.

Diagram showing a multimeter connected to three electrical components with labeled terminals and wiring connections

Technical line drawing of two analog multimeters with labeled probes and dials, showing measurement setup for voltage and current measurement.

Line drawing of a remote control device with battery and indicator lights (no text or symbols)

Diagram of a digital multimeter connected to a power supply with labeled components and measurement scale

Diagram showing two identical analog multimeters connected via probes, displaying digital and physical measurement setups with labels like 'HOLD', 'OFF', and 'TOMS'.

Line drawing of a remote control device with battery pack and two ports (no text or symbols)

Diagram of a digital multimeter connected to a power supply with labeled components and measurement scale

Pure electrical circuit lines without any symbols

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Technical line drawing of two analog multimeters with digital dials, labeled with measurement ranges and probe contacts

HOLZ UP 50.0 TOMES 10 DC A A A A A A A UPL ULP

Our international contacts

www.chauvin-arnoux.com/contacts

CHAUVIN ARNOUX

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