MX 355 - Multimeter METRIX - Free user manual and instructions

Product Type	TRMS AC/DC Digital Clamp Multimeter
Brand	Metrix (Chauvin Arnoux)
Model	MX 355
Dimensions	199 x 75 x 36 mm
Weight	243 g (with batteries)
Power Supply	2 x 1.5 V AAA/LR03 batteries
Battery Life	Approx. 40 hours (MX 355)
Display	6000-count LCD
TRMS Measurement	True RMS, sampling 2 measurements/s
Max Jaw Opening	30 mm
Measurement Category	600 V CAT III
Max Voltage (AC/DC)	600 V
Max AC Current	400 A
Max DC Current	400 A
Max Resistance	600 Ω
Continuity Test	Yes (threshold ≤ 35 Ω typical, buzzer)
Special Functions	Hold, Peak (1 ms), Delta (relative zero)
Auto Range	Yes
Auto Power Off	Yes, after 20 minutes
Safety	Double insulation, class II, IP30
Included Accessories	Set of leads, 2 batteries, carrying case, attestation
Cleaning	Soft cloth lightly dampened with soapy water, no solvent
Warranty	24 months

Frequently Asked Questions - MX 355 METRIX

How to measure AC voltage with the MX 355?

Set the switch to V~ (AC). Connect the red lead to the + terminal and black to COM. Apply the probes to the points to be measured. Read the value on the screen. If a dangerous voltage (>30 V AC) is present, a symbol flashes.

How to measure DC current with the clamp?

Set the switch to the symbol A with a straight line (DC). Open the jaws using the trigger and place the clamp around a single conductor. Release the trigger and read the value. The conductor should be centered for optimal measurement.

What does the display 'OL' mean?

'OL' (Over Load) indicates a range overload. For example, for voltage, OL appears above 630 V (900 V in Peak mode). For current, above 420 A (600 A in Peak mode). A repetitive beep may also sound.

How to use the Hold function?

Press the HOLD button to lock the displayed value. A 'H' symbol appears. Press again to release and resume live measurements.

How to change the batteries of the MX 355?

Before changing batteries, set the switch to OFF and disconnect the leads. Using a screwdriver, loosen the screw of the battery compartment on the back. Replace the old batteries with two 1.5 V AAA/LR03 batteries, respecting polarity. Screw the compartment back on.

How to perform a continuity test?

Set the switch to the '))' symbol (diode/continuity). Connect the red lead to + and black to COM. Apply the probes to the circuit. If the resistance is below approx. 35 Ω, the buzzer sounds continuously.

What is the Delta (Δ) function?

The Delta function (relative zero) allows you to set the current value as a reference. Press the Δ button to activate (the Δ symbol appears). The next measurement will be the difference from this reference. Press again to exit the mode.

How to clean the clamp multimeter?

Disconnect all connections and set the device to OFF. Use a soft cloth lightly dampened with soapy water. Rinse with a damp cloth and dry quickly. Do not use alcohol, solvent, or hydrocarbon.

What is the accuracy of DC voltage measurements?

For the 60 V range, accuracy is ±1% of reading + 3 digits. For the 600 V range, it is also ±1% of reading + 3 digits.

How to disable auto power off?

Press and hold the HOLD button while turning on the device (by rotating the switch). Auto power off will be disabled until the next power-off.

USER MANUAL MX 355 METRIX

8 HOLD CE OFF Hz TRMS -4 kHz -0.000A V COM Δ RHT CAT1 +1 RHT FOR 7 1 2 3 4 5 6 HOLD PEAK FRAE 1 Δ ZERO OFF TRMS -4 kHz -0.000A V COM Δ RHT CAT1 +1 RHT FOR

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

\~A

Diagram showing two identical analog multimeters connected to a digital display, with terminal labels and measurement scales.

I 50.0 1200 AOC 3800 HOLD CE OFF HIO HIO 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 12 signal 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 at 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.

3.7. 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)

500Ω U/L DC DC DC DC DC DC DC DC DC DC DC DC DC DC DC DC DC DC DC DC DC DC DC DC DC DC DC DC DC DC DC DC DC DC DC DC DC DC DC DC DC DC DC DC DC DC DC DC DC DC DLC DLC DLC DLC DLC DLC DLC DLC DLC DLC DLC DLC DLC DLC DLC DLC DLC DLC DLC DLC DLC DLC DLC DLC DLC DLC DLC DLC DLC DLC DLC DLC DLC DLC

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 rang	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 Hz		3.8%R + 5
400 /	60.0–400.0 /	48–65 Hz	0.1A	1.9%R + 5
		65–400 Hz		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 components (no text or symbols)

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

Diagram showing two types of analog multimeters with labeled probes and a digital display, likely for measurement or testing purposes.

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

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

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

VOL 300 HOLE CE OFF 25Ω 1Hz 35.00Ω A A + - 25Ω 25Ω 25Ω 25Ω 25Ω 25Ω 25Ω 25Ω 25Ω 25Ω 25Ω 25Ω 25Ω 25Ω 25Ω 25Ω 25Ω 25Ω 25Ω 25Ω 25Ω 25Ω 25Ω 25Ω 25Ω 25Ω

Technical line drawing of two analog multimeters with digital displays and probe probes, showing measurement ranges and terminal connections.

I mRNA. MAX 2053 HOLD E OFF 100 1Hz PWM 50.0 2000 A B C D E F G H I J K L M N O P Q R S T U V W X Y Z A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

Our international contacts

www.chauvin-arnoux.com/contacts

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