CM 4 - Measuring equipment BENNING - Free user manual and instructions

USER MANUAL CM 4 BENNING

Operating instructions BENNING CM 4 Digital current probe multimeter for - Direct voltage measurements - Alternating voltage measurements - Alternating current measurement - Resistance measurements - Continuity testing - Frequency measurement Table of contents

3. Scope of delivery

6. Environment conditions:

7. Electrical specications

8. Making measurements with the BENNING CM 4

10. Technical data of the measuring accessories

These operating instructions are intended for - skilled electricians and - trained electronics personnel. The BENNING CM 4 is intended for making measurements in dry environment. It must not be used in power circuits with a nominal voltage higher than 600 V DC and 600 V AC (More details in Section 6. “Environmental conditions”) The following symbols are used in these operating instructions and on the BENNING CM 4: Application around and removal from HAZARDOUS LIVE conductors is permitted.

Warning of electrical danger! Indicates instructions which must be followed to avoid danger to persons.

Important, comply with the documentation! The symbol indicates that the information provided in the operating instructions must be complied with in order to avoid risks. Application around and removal from HAZARDOUS LIVE conductors is permitted. This symbol on the BENNING CM 4 means that the BENNING CM 4 is totally insulated (protection class II). This symbol appears in the display to indicate a discharged battery. This symbol designates the „continuity test“ range. The buzzer is used for the acoustic result output. (DC) Direct voltage (AC) Alternating voltage or current. Ground (Voltage against ground). Note After unmark the adhesive label „Warnung...“ (on battery compartment lid) the English text appears.09/ 2013 BENNING CM 4

The instrument is built and tested in accordance with DIN VDE 0411 part 1/ EN 61010-1 and has left the factory in perfectly safe technical state. To maintain this state and ensure safe operation of the appliance tester, the user must observe the notes and warnings given in these instructions at all times.

The BENNING CM 4 may be used only in power circuits within the overvoltage category III with a conductor for 600 V max. to earth. Only use suitable measuring leads for this. With measurements within measurement category III, the projecting conductive part of a contact tip of the measuring leads must not be longer than 4 mm. Prior to carrying out measurements within measurement category III, the push-on caps provided with the set and marked with CAT III and CAT IV must be pushed onto the contact tips. The purpose of this measure is user protection. Remember that work on electrical components of all kinds is dangerous. Even low voltages of 30 V AC and 60 V DC may be dangerous to human life.

Before starting the appliance tester up, always check it as well as all cables and wires for signs of damage. Should it appear that safe operation of the appliance tester is no longer possible, it should be shut down immediately and secured to prevent it being switched on accidentally. It may be assumed that safe operation is no longer possible: - if the instrument or the measuring cables show visible signs of damage, or - if the appliance tester no longer functions, or - after long periods of storage under unfavourable conditions, or - after being subjected to rough transport.

In order to avoid danger, - do not touch the bare prod tips of the measuring cables measuring probes, - insert the measurement lines in the appropriately designated measuring sockets on the multimeter

3. Scope of delivery

The scope of delivery for the BENNING CM 4 comprises:

3.1 One BENNING CM 4,

3.2 One safety measuring cable, red (L = 1.4 m)

3.3 One safety measuring cable, black (L = 1.4 m)

3.4 One compact protective pouch,

3.5 Two 1.5-V-mignon-batteries fitted in the unit as original equipment,

3.6 One operating instructions manual

Parts subject to wear: - The BENNING CM 4 is supplied by two 1.5 V mignon batteries (IEC LR 06). - The above-mentioned safety measuring cables (tested accessories) correspond to CAT III 1000 V and are approved for a current of 10 A.

4. Description of appliance tester

See figure 1: Appliance front face The display and operator control elements specified in Fig. 1 are designated as follows: Digital display, for the measurement value, bar graph display, overranging display, Polarity indication, Battery status indication, appears when the battery is discharged, Button (yellow), display lighting, HOLD button , storage of the indicated measured value, MIN/MAX button, storage of the highest and lowest measured values , Button PEAK , peak value storage, Rotary switch, for selecting the measurement function, Jack (positive

), for V, Ω COM jack, common socket for voltage, resistance, measurement, and continuity testing,09/ 2013 BENNING CM 4

Opening lever, for opening and closing the current probe. Bulge of current probe, protects against contact with conductor.

Measuring pliers, for clamping on the single wire current-carrying conductor.

) This is what the automatic polarity indication for DC voltage refers to

5. General information

5.1 General details on the current probe multimeter

5.1.1 The digital display is a 3¾- digit liquid crystal display with 14 mm

high numerals, complete with decimal point. The largest numerical value which can be displayed is 4000.

5.1.2 The polarity indication is automatic. Only one polarity with respect to

the socket marked “-” is indicated.

5.1.3 The overranging is indicated by “0L” or “- 0L” and, in part, an acoustic

warning. Warning, no indication and prior warning in the event of an overload condition!

5.1.4 Button (yellow) switches on the display illumination. Shutdown is

effected by a renewed press of the button or automatically after 60 seconds.

5.1.5 Measured value storage “HOLD”: Press the button “HOLD” to store

the measured result. At the same time, the display shows the symbol “HOLD”. A renewed press of the button switches back into measuring mode.

5.1.6 The MIN/ MAX button function inputs and stores automatically the

highest and lowest measured value. The following values are indicated by button operation: “MAX” indicates the stored maximum value, and “MIN” indicates the lowest value. The continuous detection of the MAX-/ MIN value can be stopped or started by pressing the button “HOLD” . Pressing the button “MIN/MAX” for an extended period of time (2 seconds) switches back into normal mode.

5.1.7 The button PEAK (peak value storage) detects and stores the

positive and negative peak / crest value in the function V AC and A AC. At the start of the measurement, press the button PEAK for approx. 3 seconds in order to increase measurement precision and to fine- adjust the BENNING CM 4. Pressing the button indicates the “PMAX” or “PMIN” values in the display. An extended operation (2 seconds) of the button PEAK switches back into a standard mode.

5.1.8 The measuring rate of the BENNING CM 4 amounts nominally to 1.5

measurements per second for the digital display.

5.1.9 The BENNING CM 4 is switched on and off with the rotary switch .

Shutdown position “OFF”.

5.1.10 The BENNING CM 4 switches off automatically after approx. 30 minutes

(APO, Auto-Power-Off). It switches back on again if a button or the rotary switch is operated. A buzzer tone signals automatic switchoff of the appliance. The automatic switchoff can be deactivated by pressing a button (except the button “HOLD”) and simultaneously switching on the BENNING CM 4 from switch position “OFF”.

5.1.11 Temperature coefficient of the measured value: 0.2 x (stated measuring

precision)/ °C < 18 °C or > 28 °C, related to the value for the reference temperature of 23 °C.

5.1.12 The BENNING CM 4 is supplied by two 1.5 V mignon batteries (IEC LR

BENNING CM 4, then a battery symbol appears in the display.

5.1.14 The life span of a battery amounts to approx. 600 hours (alkali

(L x W x H) = 220 x 83 x 45 mm Appliance weight: 324 g

5.1.16 The safety measuring cables supplied are expressly suited for the rated

voltage and the rated current of the BENNING CM 4.

5.1.18 Largest opening of pliers: 37 mm

5.1.17 Largest cable diameter: 34 mm

6. Environment conditions:

- The BENNING CM 4 is intended for making measurements in dry environment. - Maximum barometric elevation for making measurements: 2000 m, - Overvoltage category/ Siting category: IEC 60664-1/ IEC 61010-1 → 600 V category III, - Contamination class: 2,09/ 2013 BENNING CM 4

- Protection Class: IP 30 (DIN VDE 0470-1 IEC/ EN 60529) IP 30 means: Protection against access to dangerous parts and protection against solid impurities of a diameter > 2.5 mm, (3 - rst index). No protec- tion against water, (0 - second index). - Operating temperature and relative humidity: For operating temperature from 0 °C to 30 °C: relative humidity less than 80 % For operating temperatures from 31 °C to 40 °C: relative humidity less than 75 % For operating temperature from 41 °C to 50 °C: relative humidity less than 45 % - Storage temperature: The BENNING CM 4 can be stored at any temperature in the range from - 20 °C to + 60 °C (relative humidity from 0 to 80 %). The battery should be taken out of the instrument for storage.

7. Electrical specications

Note: The measuring precision is specified as the sum of - a relative fraction of the measured value and - a number of digits (counting steps of the least significant digit). This specified measuring precision is valid for temperatures in the range from 18 °C to 28 °C and relative humidity less than 80 %.

7.1 Direct voltage ranges

The input resistance amounts to 1 MΩ in parallel 100 pF. Measuring range Resolution Meas. precision *

The measured value is obtained by mean value rectification and displayed as r.m.s. value. Its calibration is matched to a sinus-shaped curve type.

The measured value is obtained by mean value rectification and displayed as r.m.s. value. Its calibration is matched to a sinus-shaped curve type. The stated precision is specified for conductors that are centrally clamped by the current probe (see Fig. 4 alternating current measurement). For conductors that are not centrally clamped, an additional error of 1 % of the display value needs to be taken into account.

7.4 Resistance measuring range and acoustic continuity testing

Overload protection: 600 V eff Meas. range Resolution Meas. precision Max. idling voltage 400 Ω 0,1 Ω ± (1 % of the measuring value + 3 digits) 3 V The built-in buzzer sounds in the case of a resistance R less than 30 Ω.

7.5 Frequency ranges

Minimum sensitivity: 3 A eff

Measuring ranges: V AC, A AC Coupling type: AC In the PEAK-HOLD function (peak value storage) an additional error needs to be taken into account for the specified precision. + (± 3% + 10 digits) Measurement values: > 600 V Peak or 600 A Peak are not specified

8. Making measurements with the BENNING CM 4

8.1 Preparations for making measurements

Operate and store the BENNING CM 4 only at the specified storage and operating temperatures conditions. Avoid continuous insulation. - Check rated voltage and rated current details specified on the safety measuring lines. The nominal voltage and current ratings of the safety measuring cables included in the scope of delivery correspond to the ratings of the BENNING CM 4. - Check the insulation of the safety measuring cables. Discard the safety measuring cables immediately if the insulation is damaged. - Check safety measuring lines for continuity. If the conductor in the safety measuring line is interrupted, the safety measuring line must be quarantined immediately. - Before - at the rotary switch a different function is selected, the safety measuring lines must be disconnected from the measuring point. - Strong sources of interference in the vicinity of the BENNING CM 4 can lead to unstable readings and measuring errors.

8.2 Voltage measuring

Do not exceed the maximum permitted voltage with respect to earth potential! Electrical danger! The highest voltage which may be applied to the jacks, - COM socket - jack for V, Ω of the BENNING CM 4 against ground, amounts to 600 V. - Use the rotary switch to select the required function (V AC) or (V DC) on the BENNING CM 4. - The black safety measuring cable has to be contacted with the COM jack on the BENNING CM 4. - The red safety measuring cable has to be connected to the jack for V, Ω on the BENNING CM 4. - Bring the safety measuring lines into contact with the measuring points, read off measured value on the digital display on the BENNING CM 4. See figure 2: Direct voltage measurement See figure 3: Alternating voltage measurement

8.3 Alternating current measurement

8.3.1 Preparations for making measurements

Operate and store the BENNING CM 4 only at the specified storage and operating temperatures conditions. Avoid continuous insulation. Strong sources of interference in the vicinity of the BENNING CM 4 can lead to unstable readings and measuring errors.

Do not apply any voltage to the output contacts of the BENNING CM 4! Any possibly connected safety measuring cables have to be removed.

8.3.2 Alternating current measurement

- Use the rotary switch to select the required function (A AC) on the BENNING CM 4. - Operate opening lever , clamp single wire live conductor centrally by means of the BENNING CM 4 current probe. - Read off the digital display unit . See figure 4: Alternating current measurement

8.4 Resistance measuring and acoustic continuity testing

- Use the rotary switch to select the required function (Ω ) on the BENNING CM 4. - The black safety measuring cable has to be contacted with the COM jack on the BENNING CM 4.09/ 2013 BENNING CM 4

The red safety measuring cable has to be connected to the jack for V, Ω, Hz on the BENNING CM 4. - Bring the safety measuring lines into contact with the measuring points, read off measured value on the digital display on the BENNING CM 4. - If the conductor resistance between the COM jack and the jack for V, Ω 30 Ω, the fitted buzzer sounds on the BENNING CM 4. See figure 5: Resistance measurements

8.5 Frequency measurement via current measuring pliers

Do not apply any voltage to the output contacts of the BENNING CM 4! Any possibly connected safety measuring cables have to be removed. - Use the rotary switch to select the required function (Hz) on the BENNING CM 4. - Operate opening lever , clamp single wire live conductor centrally by means of the BENNING CM 4 current probe. - Read off the digital display unit . See figure 6: Frequency measurement via current measuring pliers

Before opening the BENNING CM 4, make quite sure that it is voltage free! Electrical danger! Work on the opened BENNING CM 4 under voltage may be carried out only by skilled electricians with special precautions for the prevention of accidents. Make the BENNING CM 4 voltage free as follows before opening the instrument: - First remove the two safety measuring lines from the object to be measured. - Then disconnect the two safety measuring cables from the BENNING CM 4. - Turn the rotary switch to the switch setting “OFF”.

9.1 Securing the instrument

Under certain circumstances safe operation of the BENNING CM 4 is no longer ensured, for example in the case of: - Visible damage of the casing. - Incorrect measurement results. - Recognisable consequences of prolonged storage under improper conditions. - Recognisable consequences of extraordinary transportation stress. In such cases the BENNING CM 4 must be switched off immediately, disconnected from the measuring points and secured to prevent further utilisation.

Clean the casing externally with a clean dry cloth (exception: special cleaning wipers). Avoid using solvents and/ or scouring agents for cleaning the instrument. It is important to make sure that the battery compartment and battery contacts are not contaminated by leaking electrolyte. If electrolyte contamination or white deposits are present in the region of the batteries or battery casing, clean them too with a dry cloth.

Before opening the BENNING CM 4, make quite sure that it is voltage free! Electrical danger! The BENNING CM 4 is fed by two 1.5-V mignon batteries. A battery change (see Figure 7) is required, if the battery symbol appears. Proceed as follows to replace the batteries: - Disconnect the safety measuring cables from the measuring circuit. - Disconnect the safety measuring cables from the BENNING CM 4. - Set the rotary switch to the switch setting “OFF”. - Lay the BENNING CM 4 face down and release the slot screws of the battery compartment cover. - Lift the battery compartment lid (in the housing recess area) from the bottom section. - Lift the discharged battery from the battery compartment and disconnect the battery supply lines from the battery.09/ 2013 BENNING CM 4

- The new batteries have to be connected to the battery supply lines, and arrange these such that they are not crushed between the housing parts. Then place the batteries into the battery compartment provided for this purpose. - Place the battery compartment cover onto the bottom part and tighten the screw. See figure 7: Battery replacement

Make your contribution to environmental protection! Do not dispose of discharged batteries in the household garbage. Instead, take them to a collecting point for discharged batteries and special waste material. Please inform yourself in your community.

To maintain the specified precision of the measurement results, the instrument must be recalibrated at regular intervals by our factory service. We recommend a recalibration interval of one year. Send the appliance to the following address: Benning Elektrotechnik & Elektronik GmbH & CO. KG Service Centre Robert-Bosch-Str. 20 D - 46397 Bocholt

10. Technical data of the measuring accessories

- Standard: EN 61010-031, - Maximum rated voltage to earth () and measuring category: With push-on caps: 1000 V CAT III, 600 V CAT IV, Without push-on caps: 1000 V CAT II, - Maximum rated current: 10 A, - Protective class II (

), continuous double or reinforced insulation, - Contamination class: 2, - Length: 1.4 m, AWG 18, - Environmental conditions: Maximum barometric elevation for making measurements: 2000 m, Temperatures: 0 °C to + 50 °C, humidity 50 % to 80 % - Only use the test leads if in perfect and clean condition as well as according to this manual, since the protection provided could otherwise be impaired. - Throw the test leads out if the insulation is damaged or if there is a break in the cable/ plug. - Do not touch the bare contact tips of the test leads. Only grab the area appropriate for hands! - Insert the angled terminals in the testing or measuring device.

11. Environmental notice

At the end of the product’s useful life, please dispose of it at appropri- ate collection points provided in your country.09/ 2013 BENNING CM 4