CM 14 - Multimeter BENNING - Free user manual and instructions

USER MANUAL CM 14 BENNING

TRUE RMS multimeter with open current clamp for - AC current measurements - AC voltage measurements - DC voltage measurements - single-pole external conductor test (phase indication) - phase sequence test - polarity test - resistance measurements - continuity testsTable of contents1. User instructions2. Safety instructions3. Scope of delivery4. Device description5. General information6. Ambient conditions7. Electrical specifications8. Measuring with the BENNING CM 1-49. Maintenance10. Technical data of measuring accessories11. Environmental note1. User instructionsThis operating manual is intended for - skilled electricians and - electrotechnically trained personnel.The BENNING CM 1-4 is intended for measurements under dry ambient condi-tions. It must not be used in electrical circuits with a voltage higher than 1000 V AC/DC (see section 6 „Ambient conditions“ for details).The following symbols are used in this operating manual and on the BENNING CM 1-4:Application around and removal from HAZARDOUS LIVE conductors is permitted. Warning of electrical danger! Indicates instructions which must be followed to avoid danger to per-sons. Attention! Must comply with documentation! This symbol indicates that the information provided in the operating manual must be complied with in order to avoid risks.CAT IIIMeasuring category III is applicable to testing and measuring circuits connected to the distribution circuit of the low-voltage mains installation of a building.CAT IVMeasuring category IV is applicable to testing and measuring circuits connected to the feed-in point of the low-voltage mains installation of a building. This symbol on the BENNING CM 1-4 indicates that the BENNING CM 1-4 is equipped with protective insulation (protection class II).Please observe the operating manual!This symbol appears on the display to indicate a discharged battery.This symbol designates the „continuity test“ eld. The buzzer is intended for acoustic result output.(DC) Direct voltage (AC) Alternating voltage or current Ground (voltage against ground)21

The instrument is built and tested in accordance with DIN VDE 0411 Part 1/ EN 61010-1 DIN VDE 0411 Part 2-032/EN 61010-2-032 DIN VDE 0411 Part 2-033/EN 61010-2-033 DIN VDE 0411 Part 031/EN 61010-031 and has left the factory in perfectly safe technical condition. To preserve this condition and to ensure safe operation of the device, the user must observe the notes and warnings given in these instructions at all times. Improper handling and non-observance of the warnings might involve severe injuries or danger to life.

WARNING! Be extremely careful when working with bare con- ductors or main line carrier! Contact with live conductors will cause an electric shock!

The BENNING CM 1-4 must be used in electrical circuits of over- voltage category III with a conductor for a maximum of 1000 V to earth or of overvoltage category IV with a conductor for a maximum of 600 V to earth only. Only use suitable measuring leads for this. With measurements within measurement category III or measurement category IV, 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 cat- egory III and measurement category IV, the push-on caps pro- vided 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. Please observe that work on live parts and electrical compo- nents of all kinds is dangerous! Even low voltages of 30 V AC and 60 V DC may be dangerous to human life!

When measuring voltages >300 V, never apply voltage to the BENNING CM 1-4 for longer than 30 seconds. For voltages >300 V, the maximum switch-on time is tON: 30 s and the recov- ery time tOFF: 240 s.

Before starting the current clamp multimeter, always check the device as well as all measuring leads for damages.

When using the BENNING CM 1-4, always hold it at the rubber- ized gripping surface behind the grip limit. If it can be assumed that safe operation is no longer possible, switch the device o󰀨 immediately and secure it against unintended operation. Safe operation can be assumed to be no longer possible, if - the device or the measuring leads exhibit visible damages, - the device no longer works, - the device has been stored under unfavourable conditions for a longer period of time, - the device was exposed to extraordinary stress during transport, or - if the device or the measuring leads are exposed to moisture.

In order to prevent danger - do not touch the bare contact tips of the measuring leads, - plug the measuring leads into the correspondingly marked measuring sockets of the multimeter and check them for tight fit.

Maintenance: Do not open the multimeter, because it contains no components which can be repaired by the user. Repair and service must be carried out by qualified personnel only!22

Cleaning: Regularly wipe the housing by means of a dry cloth and clean- ing agent. Do not use any polishing agents or solvents!

3. Scope of delivery

The scope of delivery of the BENNING CM 1-4 comprises:

3.1 One BENNING CM 1-4

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

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

3.4 One contact tip protection to protect against injuries, attached to the

black safety measuring lead. Incl. one set of protective caps (CAT III/IV) red/black to reduce the length of the uninsulated part of the contact tips and one set of 4 mm Ø contact tip extensions (CAT II).

3.5 One belt holster

3.6 Two 1.5 V micro batteries for initial assembly is integrated into the device

3.7 One operating manual

Parts subject to wear: - The BENNING CM 1-4 is supplied by means of two integrated 1.5 V micro batteries (IEC LR 03). - With the protective caps being attached, the safety measuring leads men- tioned above (tested accessories, red/black) comply with CAT III 1000 V/ CAT IV 600 V and are approved for a current of 10 A. The set of measuring leads (part no. 10217842) includes the contact tip protection incl. the protec- tive caps (CAT III/IV) and the 4 mm Ø contact tip extensions (CAT II). - The contact tip protection incl. the protective caps (CAT III/IV) and the 4 mm Ø contact tip extensions (CAT II) can be ordered separately stating the part no. 10217843. - The belt holster can be ordered stating part no. 10217845.

4. Device description

See gure 1a: Device front and set of measuring leads The display and operating elements shown in gure 1a are designated as follows:

Open current clamp, for inserting and gripping the single conductor contain- ing AC current

LED measuring point illumination

LED display, to display - the voltage levels from 12 V to 1000 V - the symbol for exceeding the ELV limit (50 V AC/120 V DC), is also used for external conductor test (phase indication)

- the symbol for the continuity test - the symbols for the phase sequence test (counter-clockwise/clockwise)

Digital display (liquid-crystal type) with following indications: - measurement reading with max. indication 9999 and decimal point - measurement reading retained (hold function) - the voltage type AC/DC - the units V (voltage), A (current), Ω (resistance) - the symbol of the disabled acoustic signal for voltage measurement - the battery symbol with max. 3 segments

Grip limit, protects against contact with conductor

Ω/Akey, toggling between resistance/current measuring range

HOLD key (hold function)/ enabling the measuring point illumination (2 s)/ disabling the acoustic signal for voltage measurement (5 s)

Rubberized gripping surface

Blackjack(-/L1), common jack for voltage/ resistance measurements and continuity tests

RedJack(+/L2) (positive

Setofsafetymeasuringleads(red/black) incl. contact tip protection with protective caps (CAT III/IV) and 4 mm Ø contact tip extensions (CAT II)

This is what the automatic polarity indication for DC voltage refers to23

is a 4-digit LC display with a font size of 13 mm and a decimal point. The highest numerical value to be displayed is 9999.

works automatically. Only a polarity contrary to the jack denition is indicated with „-“. As of 12 V, polarity is indicated by the -LED or the -LED lighting up.

5.1.3 The range exceedance is indicated by „OL“ or „-OL“.

Attention, no other indication and warning in case of overload!

to switch to the resistance measuring range (Ω). Press the key again to switch to the current measuring range (A). Press the key for 2 s to switch back to the voltage measuring range (display - - - -).

5.1.5 The “HOLD” key

has three functions: - Storage of measured values „HOLD“: The measuring result can be stored by actuating the key

. The symbol simultaneously ap-symbol simultaneously ap- pears on the display. By pressing the key

again, the device is switched back to the measuring mode. - Measuring point illumination: Press and hold the “HOLD” key

for 2 s to switch on the LED of the measuring point illumination. - Acoustic signal for voltage measurement: Press and hold the “HOLD” key

for 5 s to disable the acoustic signal for voltage measurement, see section 8.3 “Acoustic signal for voltages >50 V AC/ 120 V DC”.

5.1.6 The nominal measuring rate of the BENNING CM 1-4 is 3 measure-

5.1.7 The BENNING CM 1-4 can be switched on by pressing the Ω/A key

indicates readiness for voltage measurement, single-pole external conductor test and continuity test. Under the following conditions, the device switches on automatically: Batteries with su󰀩cient battery voltage being inserted: - Measuring voltage between +/L2 jack

> 3 V or < -8 V - Single-pole external conductor test detects the phase voltage - Continuity test detects a resistance < 1.8 kΩ to 2.7 kΩ No batteries being inserted or battery voltage too low: - Measuring voltage between +/L2 jack

The BENNING CM 1-4 switches o󰀨 automatically after approx. 10 s if the following conditions are met: - No key has been pressed. - The conditions for automatic switch-on are not met. The BENNING CM 1-4 switches o󰀨 automatically after approx. 30 s if the following conditions are met: - “OL” is displayed in the resistance measuring range. - Display value <1 A in the current measuring range

5.1.9 Temperature coe󰀩cient of the measured value: 0.2 x (stated measuring

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

5.1.10 The BENNING CM 1-4 is supplied by means of two 1.5 V micro batteries

continuously shows the re- maining battery capacity via a maximum of three segments.

As soon as all segments of the battery symbol have disap- peared and the battery symbol is flashing, the batteries must be replaced by new ones immediately in order to prevent danger for persons caused by incorrect measurements.

5.1.12 The battery life is su󰀩cient for 1000 tests (alkaline battery, 30 s ON, 240

5.1.14 The safety measuring leads with the contact tips correspond to the nomi-

nal voltage of the BENNING CM 1-4. The contact tips can be protected by contact tips protectors and can be snapped onto the bottom of the device for transport and measuring tasks.

5.1.15 Current clamp opening: 16 mm24

6 - first index: protection against access to dangerous parts and protection

against solid impurities, dustproof

5 - second index: protected against water jets. The device can also be used

in the rain. - Operating temperature and relative air humidity: For operating temperatures from - 15 °C to 30 °C: relative air humidity lower than 80 %. For operating temperatures from 31 °C to 40 °C: relative air humidity lower than 75 %. For operating temperatures from 41 °C to 55 °C: relative air humidity lower than 45 %. - Storage temperature: The BENNING CM 1-4 can be stored at temperatures between - 20 °C and + 60 °C (air humidity 0 to 80 %). During storage, the battery should be re- moved.

7. Electrical specifications

Note: The measuring accuracy is specied as the sum of: - a relative part of the measured value and - a number of digits (i.e. counting steps of the last digit). This measuring accuracy applies to temperatures from 23 °C ± 5 °C and a rela- tive air humidity lower than 80 %. The measuring value is gained and indicated as e󰀨ective value (True RMS, AC coupling). In case of non-sinusoidal curves, the indicating value becomes inac- curate. Thus, an additional error occurs for the following crest factors: crest factor from 1.0 to 2.0 additional error + 1.0 % crest factor from 2.0 to 2.5 additional error + 2.5 % crest factor from 2.5 to 3.0 additional error + 4.0 % max. crest factor: crest factor 3 @ 5000 Digit crest factor 1.5 @ 9999 Digit

7.1 AC voltage ranges

Overload protection: 1000 V AC/DC Function Measuring range Resolution Measurement accuracy With batteries 6.0 V - 999.9 V

in frequency range 45 Hz - 200 Hz ± (3.5 % of reading + 7 digits) in frequency range 200 Hz - 400 Hz Without batteries 45.0 V - 999.9 V 0.1 V The input resistance for voltage measurement depends on the applied voltage: approx. 20 kΩ at 50 V to approx. 305 kΩ at 1000 V U > 300 V: tON: 30 s, tOFF: 240 s

For frequencies higher than 65 Hz, the lower measuring range is 8 V.

7.2 DC voltage ranges

Overload protection: 1000 V AC/DC Function Measuring range Resolution Measurement accuracy With batteries 6.0 V - 999.9 V

± (1.0 % of reading + 4 digits) Without batteries 35.0 V - 999.9 V 0.1 V The input resistance for voltage measurement depends on the applied voltage: approx. 20 kΩ at 50 V to approx. 305 kΩ at 1000 V U > 300 V: tON: 30 s, tOFF: 240 s25

Measuring range Resolution Measurement accuracy in frequency range 45 Hz - 65 Hz Overload protection 200 A 0.1 A ± (3.0 % of reading + 7 digits) 200 A

7.4 Resistance measuring ranges

Measuring voltage: approx. 0.5 V

The integrated buzzer sounds at a resistance R lower than approx. 1.8 kΩ to

Acoustic indication: signal of 2.7 kHz Optical indication: -LED Response time: <100 ms Open-circuit voltage: approx. 0.5 V Overload protection: 1000 V AC/DC

7.6 Single-pole external conductor test (phase indication)

Sensitivity: 90 V to 1000 V (voltage to earth) in earthed mains Frequency range: 45 Hz - 65 Hz Acoustic indication: signal of 2.7 kHz Optical indication:

7.7 Phase sequence test

Sensitivity: 90 V to 1000 V (voltage to earth) in earthed mains Frequency range: 45 Hz - 65 Hz Optical indication: -LED, -LED

8. Measuring with the BENNING CM 1-4

8.1 Preparation for measuring

Operate and store the BENNING CM 1-4 at the specied storage and operating temperatures only! Do not permanently expose the device to sunlight. - Check stated nominal voltage and nominal current on the safety measuring leads. Nominal voltage and current of the enclosed safety measuring leads comply with the respective values of the BENNING CM 1-4. - Check insulation of the safety measuring leads. If the insulation is damaged, the safety measuring leads must be replaced immediately. - Check the safety measuring leads for continuity. If the conductor in the safety measuring lead is interrupted, replace the safety measuring leads immedi- ately. - Attach the protective caps (CAT III/IV) to the contact tips before making measurements in circuits of overvoltage category CAT III or IV. see fig. 1b: Using the protective caps - The rear holder of the BENNING CM 1-4 is intended for attaching the mea- suring leads for voltage measurement and when not in use/for storage. see fig. 1c: Measuring leads holder - Strong sources of interference in the vicinity of the BENNING CM 1-4 might involve unstable readings and measuring errors.

8.2 Self-testingfunction(self-test)

After each switch-on via the Ω/A key

, the BENNING CM 1-4 carries out a self-test. An acoustic signal is emitted and all display segments and LED indications must light up briey. If the self-test detects an abnormal behaviour, the device must be switched o󰀨 immediately and secured against unintended operation. Before and after using the BENNING CM 1-4, check the function of the voltage measurement and the single-pole external conductor test (phase indication) at a known voltage source.26

If the measuring voltage at the input jacks

exceeds the voltage 50 V AC/ 120 V DC, an acoustic signal is emitted during the voltage measurement and the

LED lights up. The acoustic signal can be permanently disabled if necessary (e. g. in o󰀩ces). For this, press the Ω/A key

to switch on the BENNING CM 1-4. As soon as the readiness for operation is indicated by the “- - - -” symbol, press and hold the HOLD key

for 5 s until the symbol appears on the digital display

. In addition, the “OFF” symbol appears briey and the

LED lights up. Pressing the HOLD key

again for 5 s switches the acoustic signal on again and the symbol disappears. In addition, the activation will be conrmed by the “bEEP” symbol being shown on the digital display

8.4 Voltage measurement

Do not exceed the maximum permitted voltage with respect to earth potential! Please observe the overvoltage category of the electric circuit! Attach the protective caps (CAT III/IV) to the contact tips be- fore making measurements in circuits of overvoltage category CAT III or IV. Electrical danger! The highest voltage that may be applied to the jacks - jack (-/L1), black

for voltage and resistance measurements as well as for continuity testing, of the BENNING CM 1-4 against ground is 1000 V. - Connect the black safety measuring lead to the black jack (-/L1)

of the BENNING CM 1-4. - Connect the red safety measuring lead to the red jack (+/L2)

to switch on the BENNING CM 1-4. - The BENNING CM 1-4 is ready as soon as the digital display

shows the “ - - - - “ symbol. - Bring the safety measuring leads into contact with the measuring points and read the measured value on the digital display

of the BENNING CM 1-4. - Alternating voltages are displayed by the symbol on the digital display

and, as of 12 V, by the LED and the LED lighting up simultaneously. - Direct voltages are displayed by the symbol on the digital display

. As of 12 V, the polarity applied to the red test probe +/L2 is indicated by the LED or the LED lighting up. see g. 2: Alternating voltage measurement see g. 3: Direct voltage measurement

8.5 AC current measurements

Do not apply any voltage to the output contacts of the BENNING CM 1-4! During current measurement, the safety measuring leads must not be attached to the rear holder of the BENNING CM 1-4! - Press the Ω/A key

again twice until the digital display

shows the “A” symbol. - Push the fork over the conductor wire. The conductor wire must be in the open area. - Read the value indicated on the digital display

8.6 Resistance measurements

- Connect the black safety measuring lead to the black jack (-/L1)

of the BENNING CM 1-4. - Connect the red safety measuring lead to the red jack (+/L2)

again once until the digital display

shows the “Ω” symbol. - Bring the safety measuring leads into contact with the measuring points and read the measured value on the digital display

of the BENNING CM 1-4.27

Note: - If a voltage is applied to the measuring point, the BENNING CM 1-4 auto- matically switches to the voltage measuring range. see g. 5: Resistance measurement

8.7 Continuity tests with buzzer and LED

- Connect the black safety measuring lead to the black jack (-/L1)

of the BENNING CM 1-4. - Connect the red safety measuring lead to the red jack (+/L2)

to switch on the BENNING CM 1-4. - The BENNING CM 1-4 is ready as soon as the digital display

shows the “ - - - - “ symbol. - Bring the safety measuring leads into contact with the measuring points. If the line resistance between the black jack (-/L1)

and the red jack (+/L2)

falls below a value between 1.8 kΩ and 2.7 kΩ, the integrated buzzer of the BENNING CM 1-4 sounds and the LED lights up. Note: - If a voltage is applied to the measuring point, the BENNING CM 1-4 auto- matically switches to the voltage measuring range. see g. 6: Continuity test with buzzer

8.8 Phase sequence test

Do not exceed the maximum permitted voltage with respect to earth potential! Please observe the overvoltage category of the electric circuit! Attach the protective caps (CAT III/IV) to the contact tips be- fore making measurements in circuits of overvoltage category CAT III or IV. Electrical danger! The highest voltage that may be applied to the jacks - jack (-/L1), black

for voltage and resistance measurements as well as for continuity testing, of the BENNING CM 1-4 against ground is 1000 V. - Connect the black safety measuring lead to the black jack (-/L1)

of the BENNING CM 1-4. - Connect the red safety measuring lead to the red jack (+/L2)

of the BENNING CM 1-4 and snap the test probe +/L2 onto the rear holder on the BENNING CM 1-4. - Press the Ω/A key

to switch on the BENNING CM 1-4. - The BENNING CM 1-4 is ready as soon as the digital display

shows the “ - - - - “ symbol. - Fully grasp the rubberized gripping surface

of the BENNING CM 1-4, ap- ply the test probes -/L1 and +/L2 to two external conductors (phases) and check whether the external conductor voltage of e. g. 400 V is applied. - A clockwise phase sequence (phase L1 before phase L2) is given, if the green LED lights up. - A counter-clockwise phase sequence (phase L2 before phase L1) is given, if the green LED lights up. - The phase sequence test always requires a countercheck with the test probes -/L1 and +/L2 being inverted. Note: The phase sequence test can be carried out in an earthed three-phase mains from 90 V to 1000 V, 45 Hz to 65 Hz (phase to phase). Protective clothing and insulating conditions on site might impair the function. see g. 7.1: Phase sequence test (clockwise) see g. 7.2: Phase sequence test (counter-clockwise)28

of the BENNING CM 1-4! Do not exceed the maximum permitted voltage with respect to earth potential! Please observe the overvoltage category of the electric circuit! Attach the protective caps (CAT III/IV) to the contact tips be- fore making measurements in circuits of overvoltage category CAT III or IV. Electrical danger! - Connect the black safety measuring lead to the black jack (-/L1)

of the BENNING CM 1-4. - Connect the red safety measuring lead to the red jack (+/L2)

to switch on the BENNING CM 1-4. - The BENNING CM 1-4 is ready as soon as the digital display

shows the “ - - - - “ symbol. - Fully grasp the rubberized gripping surface

of the BENNING CM 1-4 and apply the red test probe +/L2 to the system part to be tested. - If the red

LED lights up and an acoustic signal is emitted, the external conductor (phase) of an AC voltage is applied to this system part. Note: The single-pole external conductor test (phase indication) can be carried out in an earthed three-phase mains from 90 V to 1000 V, 45 Hz to 65 Hz (phase to phase). Protective clothing and insulating conditions on site might impair the function. see g. 8: Single-pole external conductor test (phase indication)

Before opening the BENNING CM 1-4, strictly observe that the device is free of voltage! Electrical danger! Working on the opened BENNING CM 1-4 under voltage must be carried out by skilled electricians special precautions for the prevention of accidents only! Make sure that the BENNING CM 1-4 is free of voltage as described below be- fore opening the device: - First, remove both safety measuring leads from the object to be measured. - Then, remove both safety measuring leads from the BENNING CM 1-4. - Wait until the BENNING CM 1-4 switches o󰀨 automatically.

9.1 Securing the device

Under certain circumstances, safe operation of the BENNING CM 1-4 might no longer be ensured, e.g. in case of: - visible damage of the housing and/or the safety measuring leads, - incorrect measuring results, - abnormal behaviour during the self-test - recognizable consequences of prolonged storage under inadmissible condi- tions and - recognizable consequences of extraordinary stress due to transport. In such cases, immediately switch o󰀨 the BENNING CM 1-4, disconnect it from the measuring points and secure it against further use.

Clean the exterior of the device with a clean dry cloth (exception: special cleaning wipers). Do not use any solvents and/or abrasives to clean the device. Make sure that the battery compartment and the battery contacts are not contaminated by leaking battery electrolyte. If there are electrolyte contamination or white deposits in the area of the battery or the battery compartment, clean these areas as well by means of a dry cloth.

9.3 Battery replacement

Before opening the BENNING CM 1-4, strictly observe that the device is free of voltage! Electrical danger! The BENNING CM 1-4 is supplied by means of two integrated 1.5 V micro bat- teries. Battery replacement (see g. 9) is required as soon as all segments of29

the battery symbol on the digital display

have disappeared and the battery symbol is ashing. Proceed as follows to replace the battery: - Disconnect the safety measuring leads from the measuring circuit. - Remove the safety measuring leads from the BENNING CM 1-4. - Wait until the BENNING CM 1-4 switches o󰀨 automatically. - Unscrew the two screws from the battery compartment cover. - Lift the battery compartment cover to remove it from the housing. - Remove the discharged battery from the battery compartment. - Insert the new batteries into the battery compartment observing correct po- larity. See gure 9: Battery replacement

Make your contribution for environmental protection! Do not dis- pose of discharged batteries via the household waste. Instead, return them to a collecting point for discharged batteries or spezial waste. Please look for information in your community‘s facilities.

Benning guarantees compliance with the technical and accuracy specications stated in the operating manual for the rst 12 months after the delivery date. To maintain accuracy of the measuring results, the device must be recalibrated in regular intervals by our factory service. We recommend recalibrating the device once a year. For this purpose, send the device to the following address: Benning Elektrotechnik & Elektronik GmbH & Co. KG Service Center Robert-Bosch-Str. 20 D - 46397 Bocholt

10. Technical data of 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 With 4 mm Ø contact tip extensions: 1000 V CAT II - Maximum rated current: 10 A - Protection class II (), continuous double or reinforced insulation - Contamination class: 2 - Length: 1.4 m - Ambient conditions: Maximum barometric height for measurements: 2000 m Temperature: 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. - Replace the measuring leads, if the insulation is damaged or if the conductor/ connector is interrupted. - Do not touch the bare contact tips of the measuring leads. Only touch the area behind the grip limit intended for your hands! - Insert the bent terminals into the testing or measuring device.

11. Environmental note

At the end of product life, dispose of the unserviceable device via ap- propriate collecting facilities provided in your community.30

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