BENNING CM 1-2 Digital Current-Clamp Multimeter User Manual

1. Introduction

This manual provides essential information for the safe and effective operation of the BENNING CM 1-2 Digital Current-Clamp Multimeter. The CM 1-2 is a durable and compact instrument designed for measuring AC currents up to 400 A/AC, as well as AC/DC voltages, resistances, and performing continuity tests. Its digital LC display provides clear readings, and a sliding switch allows for selection of different measurement ranges.

Please read this manual thoroughly before using the device to ensure proper handling and to prevent potential hazards.

2. Safety Information

Always adhere to the following safety precautions to prevent electric shock, injury, or damage to the multimeter or equipment under test.

• Measurement Category: This device is rated CAT III 600 V. Do not use it for measurements exceeding this category or voltage.
• Inspection: Before each use, inspect the multimeter and test leads for any damage. Do not use if damaged.
• Proper Use: Use the multimeter only for its intended purpose as described in this manual.
• Live Circuits: Exercise extreme caution when working with live circuits. Always assume circuits are live until proven otherwise.
• Personal Protective Equipment (PPE): Wear appropriate PPE, such as insulated gloves and safety glasses, when performing electrical measurements.
• Battery Replacement: Replace batteries promptly when the low battery indicator appears to ensure accurate readings and proper operation.
• Environmental Conditions: Do not use the multimeter in wet or damp conditions, or in environments with explosive gas or vapor.
• Servicing: Do not attempt to repair or modify the multimeter. Refer all servicing to qualified personnel.

3. Product Features

The BENNING CM 1-2 Digital Current-Clamp Multimeter offers the following key features:

• Automatic shut-off to conserve battery life.
• Battery undervoltage display to indicate low battery status.
• Measured value memory (HOLD function) for convenient reading retention.
• Maximum 30 mm jaw opening for clamping around conductors.
• Measurement category CAT III 600 V for enhanced safety.
• Measures AC current up to 400 A.
• Measures AC/DC voltage.
• Measures resistance.
• Performs continuity tests.

4. Package Contents

Verify that all items are present and undamaged upon opening the package:

• 1 x BENNING CM 1-2 Digital Current-Clamp Multimeter
• 2 x AAA batteries (included)
• Test leads (integrated or separate, typically included)
• Carrying case (if applicable, not explicitly mentioned but common)
• This User Manual

Figure 4.1: Front view of the BENNING CM 1-2 Digital Current-Clamp Multimeter, highlighting its display, function dial, and clamp jaws.

5. Setup

5.1 Battery Installation

The BENNING CM 1-2 requires 2 AAA alkaline batteries for operation.

1. Locate the battery compartment cover on the rear of the multimeter.
2. Use a screwdriver (if necessary) to open the battery compartment.
3. Insert the 2 AAA batteries, ensuring correct polarity (+ and -) as indicated inside the compartment.
4. Replace the battery compartment cover and secure it.

The multimeter is now ready for use.

6. Operating Instructions

Familiarize yourself with the function dial and input terminals before proceeding with measurements.

6.1 Powering On/Off

• To power on, rotate the central sliding switch from "OFF" to the desired measurement function (e.g., A~, V~, V=, Ω))).
• To power off, rotate the sliding switch back to the "OFF" position.
• The device features an automatic shut-off function to conserve battery life if left idle for a period.

6.2 Measuring AC Current (A~)

Use the clamp jaws to measure AC current without breaking the circuit.

1. Rotate the sliding switch to the "A~" position.
2. Open the clamp jaws by pressing the lever on the side.
3. Enclose only one conductor of the circuit within the clamp jaws. Ensure the jaws are fully closed.
4. Read the AC current value displayed on the LC screen.

Figure 6.1: The BENNING CM 1-2 in use, clamping around a single conductor to measure AC current.

Figure 6.2: The multimeter displaying a current reading of 31.2 A on its digital screen while clamped to a conductor.

6.3 Measuring AC/DC Voltage (V~ / V=)

Use the test leads for voltage measurements.

1. Insert the black test lead into the "COM" input terminal.
2. Insert the red test lead into the "V-Ω" input terminal.
3. Rotate the sliding switch to the "V~" for AC voltage or "V=" for DC voltage.
4. Connect the test leads in parallel across the circuit or component to be measured.
5. Read the voltage value displayed on the LC screen.

6.4 Measuring Resistance (Ω) and Continuity Test ()))

Use the test leads for resistance and continuity measurements.

1. Ensure the circuit or component is de-energized before measuring resistance or continuity.
2. Insert the black test lead into the "COM" input terminal.
3. Insert the red test lead into the "V-Ω" input terminal.
4. Rotate the sliding switch to the "Ω)))" position.
5. For resistance: Connect the test leads across the component. Read the resistance value.
6. For continuity: Connect the test leads across the circuit path. A continuous beep indicates continuity (low resistance).

6.5 HOLD Function

The HOLD function allows you to freeze the current reading on the display.

• While a measurement is being taken, press the "HOLD" button. The displayed value will be frozen.
• Press the "HOLD" button again to release the reading and return to live measurement.

7. Maintenance

7.1 Cleaning

To clean the multimeter, wipe the case with a damp cloth and a mild detergent. Do not use abrasives or solvents. Ensure the device is powered off and disconnected from any circuits before cleaning.

7.2 Battery Replacement

When the battery undervoltage indicator appears on the display, replace the batteries immediately to ensure accurate measurements. Refer to Section 5.1 for battery installation instructions. Always use new AAA alkaline batteries.

7.3 Storage

If the multimeter is not to be used for an extended period, remove the batteries to prevent leakage and damage to the device. Store the multimeter in a cool, dry place, away from direct sunlight and extreme temperatures.

8. Troubleshooting

If the problem persists after attempting these solutions, contact customer support.

9. Specifications

10. Warranty and Support

For warranty information, please refer to the warranty card included with your product or contact BENNING customer service.

If you encounter any issues or have questions not covered in this manual, please contact BENNING customer support for assistance.

• Manufacturer: Benning
• Model Number: 044062
• Brand: BENNING
• Website: www.benning.de (as indicated on product packaging)