CM 91 - Multimeter BENNING - Free user manual and instructions

USER MANUAL CM 91 BENNING

TRUE RMS leakage current clamp according to EN 61557-13 for - measuring the leakage currents (differential current and protective con- ductor current) in electrical systems and devices - AC/ DC voltage measurements - AC current measurements - resistance measurements - continuity tests Table of contents

3. Scope of delivery

8. Measuring with the BENNING CM 9-1

10. Technical data of measuring accessories

This operating manual is intended for - skilled electricians and - electrotechnically trained personnel. The BENNING CM 9-1 is intended for making measurements in dry environ- ment. It must not be used in power circuits with a nominal voltage higher than CAT IV 300 V or CAT III 600 V (More details in Section 6. “Ambient conditions”). The following symbols are used in this operating manual and on the BENNING CM 9-1: 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 III Measuring category III is applicable to testing and measuring circuits connected to the distribution circuit of the low-voltage mains installa- tion of a building. CAT IV Measuring category IV is applicable to testing and measuring circuits connected to the feed-in point of the low-voltage mains installation of a building. Donotusethedeviceinexternallow-frequencymagneticeldswith more than 30 A/m.

This symbol on the BENNING CM 9-1 indicates that the BENNING CM 9-1 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.Thebuzzerisin- tended for acoustic result output. (DC) Direct voltage

Ground (voltage against ground)10/ 2019

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 DIN VDE 0413 Part 13/EN 61557-13 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 9-1 must be used in electrical circuits of over- voltage category III with a conductor for a maximum of 600 V to earth or of overvoltage category IV with a conductor for a maximum of 300 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!

Before starting the current clamp multimeter, always check the device as well as all measuring leads for damages. If it can be assumed that safe operation is no longer possible, switch the device off 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 pe- riod of time, - the device was exposed to extraordinary stress during transport, or - if the device or the measuring leads are exposed to moisture.

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!

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 9-1 comprises:

3.1 One BENNING CM 9-1

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 compact protective pouch

3.5 Two 1.5 V micro batteries (IEC LR03/ AAA)

3.6 One operating manual

Parts subject to wear: - The BENNING CM 9-1 is supplied by means of two integrated 1.5 V micro batteries (IEC LR 03/ AAA). - The above mentioned safety measuring leads (tested spare part, part no.10/ 2019

044145) are approved in accordance with CAT III 1000 V/ CAT IV 600 V and for a current up 10 A.

Prong guard, protects user from accidental contact with conductor

Opening lever, for opening and closing the current prongs

Rotary switch, for selecting the measurement function

ZERO/LPF key, for zero balance or differential measuring, enabling the low- passlter(LPF)

PEAK key, peak value storage

HOLD/RANGE button, storage of the indicated measured value, switch- over to manual measuring range selection (V and A).

Digital display, for displaying the measured value and range exceedance

COM jack, common jack for voltage and resistance measurements as well as for continuity testing, marked in black

V-Ω jack (positive), common jack for voltage and resistance measurements as well as for continuity testing, marked in red

Battery compartment cover, at the rear of the housing

is designed as a 4 digit liquid-crystal indicator with 12 mm digit height with decimal point. The highest value displayed is

works automatically. Contrary to the measurement-wire definition, only one pole is indicated as “-”.

5.1.3 In case of a range exceedance (overflow), “0L.” is displayed.

Attention: no display or warning by complete overload.

is intended for selecting the measuring function. The selection of the measuring range is automatic.

has two functions: - ZERO function: For zero adjustment in current measurement. Can also be used for all ranges for differential measurement (zero setting possible for any value). Indicated by “ZERO” in the digital display

for 2 seconds to enable a low-pass filter (40 Hz to 70 Hz) in the A and mA ranges. An active filter is visual- ized by the “LPF” symbol on the LC display

. The low-pass filter (LPF) suppresses high-frequency interfering signals generated by electrical devices/installations with frequency converters. The limit- ing frequency is approx. 180 Hz. Note: When the low-pass filter (LPF) is disabled, the frequency characteristics of the BENNING CM 9-1 meet the requirements of EN 61557-16 (VDE 0413-16) and can be used to measure protective conductor currents and differential currents of electrical devices.

has two functions: - Press this key in the measuring modes V and A to measure and store the peak value. Briefly press the key again to return to the normal mode. - In the measuring mode, press the PEAK key

to change from resistance measurement to the acoustic continuity test.

has two functions: - The measuring result can be stored by pressing the HOLD key

. The “HOLD” symbol simultaneously appears on the display

Press the key again to switch the device back to measuring mode. - Press and hold the key for 2 seconds to leave the automatic mea- suring range selection and to manually switch to the next higher measuring range (V and A). As soon as another measuring function is selected via the rotary switch

, the automatic measuring range selection is active again.

. It is switched off by pressing the key again or automatically after approx. 30 seconds.

5.1.9 The measuring rate of the BENNING CM 9-1 amounts nominally to 2

5.1.10 The BENNING CM 9-1 is switched on and off with the rotary switch

Shutdown position “OFF”.

5.1.11 The BENNING CM 9-1 switches off automatically after approx. 30 min-

utes (APO, Auto-Power-Off is activated, if the symbol is shown on the display

is switched on again from switch position „OFF“. Automatic switch-off can be deac- tivated by pressing the HOLD key and by simultaneously switching on the BENNING CM 9-1 from the switching position “OFF”. The symbol disappears from the display

5.1.12 The BENNING CM 9-1 is supplied by two 1.5 V batteries (IEC LR03/

BENNING CM 9-1, then a battery symbol appears in the display

5.1.14 The battery life depends on the measuring function used and is approxi-

mately 40 hours to 60 hours without using the acoustic continuity test and background lighting (alkaline battery).

5.1.15 Temperature coefficient of the measured value: 0.1 x (stated measuring

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

5.1.16 Dimensions of unit (length x width x height) = 210 x 76 x 33,5 mm.

Weight of unit: 296 g (incl. batteries)

5.1.17 The safety measuring leads and measurement tips supplied are espe-

cially suited to the rated voltage of the BENNING CM 9-1. The measur- ing tips can be protected by caps.

5.1.18 Widest prong opening: 23 mm

3.5 mA to 600 mA, fn: 40 Hz to 1 kHz

- Contamination class: 2 (EN 61010-1), - 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 - first index). No protec- tion against water, (0 - second index). - Operating temperature and relative humidity: For operating temperatures from 0 °C to 40 °C: relative air humidity lower than 80 %, non-condensing. - Storage temperature: The BENNING CM 9-1 can be stored at temperatures between - 10 °C and + 60 °C, at a relative air humidity lower than 80 % without batteries.

7.1 DC voltage ranges

The measured value is obtained and displayed as real r.m.s. value (True RMS, AC coupling). Its calibration is adapted to sinusoidal curves. In case of devia- tions from this curve shape, the accuracy of the displayed value decreases. Crestfactor<2.0upto100%ofeachnalmeasuringrangevalue Crestfactor<4.0upto50%ofeachnalmeasuringrangevalue Theinputresistanceis≥2MΩ.10/ 2019

Measuring range Resolution Measurement accuracy Overload protection

The measured value is obtained and displayed as real r.m.s. value (True RMS, AC coupling). Its calibration is adapted to sinusoidal curves. In case of devia- tions from this curve shape, the accuracy of the displayed value decreases. Crestfactor<2.0upto100%ofeachnalmeasuringrangevalue Crestfactor<4.0upto50%ofeachnalmeasuringrangevalue Overload protection: 60 A AC/DC low-pass filter (40 Hz - 70 Hz) deactivated Measuring range Resolution Measurement accuracy 15 Hz ~ 40 Hz 40 Hz ~ 70 Hz 70 Hz ~ 200 Hz

Lowest value displayed: 0.010 mA Frequency characteristics according to EN 61557-16 (VDE 0413-16) Limiting frequency fg (- 3 dB): approx. 1 kHz low-pass filter (40 Hz - 70 Hz) activated Measuring range Resolution Measurement accuracy 40 Hz ~ 70 Hz

Open circuit-voltage: approx. 3 V, max. testing current 1 mA Measuring range Resolution Measurement accuracy Overload protection

Open circuit-voltage: approx. 3 V, max. testing current 1 mA Thebuilt-inbuzzersoundswhenresistanceislessthan45Ω.

7.6 Variations and uncertainties

Variation E1 Position 1 % of the measured value E2 Supply voltage - E3 Temperature

0.1 x (stated measuring accuracy)/ °C

E11 External low-frequency magnetic field (15 Hz to 400 Hz acc. to IEC 61000-4-8) ± 10 µA per 1 µT (magnetic field) E12 Load current when using the differential current method ± 6 µA per 1 A load current additionally E13 Contact current caused by common-mode rejection

8. Measuring with the BENNING CM 9-1

8.1 Preparing the measurement

OperateandstoretheBENNINGCM9-1atthespeciedstorageandoperating temperatures only! Do not permanently expose the device to sunlight. - Check rated voltage and rated current details specified on the safety mea- suring leads. The nominal voltage and current ratings of the safety measur- ing leads included in the scope of delivery correspond to the ratings of the BENNING CM 9-1. - Check the insulation of the safety measuring leads. If the insulation is dam- aged, the BENNING CM 9-1 must be scrapped immediately. - Check the continuity of the safety measuring leads. If the leads are discon- nected at any point, remove it immediately. - Before at the rotary switch

a different function is selected, the safety mea- suring leads must be disconnected from the measuring point. - Strong sources of interference in the vicinity of the BENNING CM 9-1 might involve unstable readings and measuring errors.

8.2 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 maximum voltage which may be applied to the sockets - COM socket, black

for voltage and resistance measurements and con- tinuity testing (marked red) of the BENNING CM 9-1 against ground, amounts to 300 V CAT IV/ 600 V CAT III. - Use the rotary switch

to select the required function

or V on the BENNING CM 9-1. - The black safety measuring lead has to be contacted with the COM jack

, marked in red. - Bring the safety measuring leads into contact with the measuring points, read off measured value on the digital display

on the BENNING CM 9-1. Note: - In small voltage measuring ranges, the zero-volt indication does not appear (due to interference) when the safety measuring leads are open. Make sure that the BENNING CM 9-1 is fully functional by short-circuiting the measur- ing tips. Seegure2: DCvoltagemeasurement Seegure3: ACvoltagemeasurement10/ 2019

8.3 Current measurement

Do not apply any voltage to the input jacks

of the BENNING CM 9-1! Any possibly connected safety measuring leads have to be removed. - Use the rotary switch

to select the required function mA

to set the BENNING CM 9-1 to the starting point. - Operate opening lever

single wire live conductor centrally by means of the BENNING CM 9-1 current probe. - Read off the digital display unit

8.3.1 Leakage current measurement at the ground conductor

Seegure4: Leakagecurrentmeasurementatthegroundconductor

8.3.2 Differential current measurement at single-phase systems

Seegure5: Differentialcurrentmeasurementatsingle-phasesystems

8.3.3 Leakage current measurement via ground conductor (charge

eliminator) for three-phase supply Seegure6: Leakagecurrentmeasurementviagroundconductor(charge eliminator) for three-phase supply

8.3.4 Differential current measurement, load supplied in three-phase,

without N-type conductor Seegure7: Differential current measurement, load supplied in three- phase, without N-type conductor

8.3.5 Differential current measurement, load supplied in three-phase,

with N-type conductor Seegure8: Differential current measurement, load supplied in three- phase, with N-type conductor

8.3.6 Alternating current measurement

Seegure9: Alternatingcurrentmeasurement

8.4 Resistance measurement

- Select the function by means of the rotary switch

of the BENNING CM 9-1. - The black safety measuring lead has to be contacted with the COM jack

, marked in red. - Bring the safety measuring leads into contact with the measuring points, read off measured value on the digital display

on the BENNING CM 9-1. Note: - To obtain a correct measurement, ensure that no voltage is applied to the measuring point. Seegure10: Resistancemeasurement

8.5 Continuity testing with buzzer

- The black safety measuring lead has to be contacted with the COM jack

, marked in red. - Apply the safety measuring leads to the measuring points. If the resistance betweenthemeasuringpointsfallsbelowapprox.45Ω,theintegratedbuzz- er of the BENNING CM 9-1 sounds. Seegure11: Continuitytestingwithbuzzer

Before opening the BENNING CM 9-1, make sure that it is free of voltage! Electrical danger! Work on the opened BENNING CM 9-1 under voltage may be carried out only by skilled electricians with special precautions for the prevention of ac- cidents. Make sure that the BENNING CM 9-1 is free of voltage as described below10/ 2019

before opening the instrument: - First, remove the BENNING CM 9-1 and the two safety measuring leads from the measuring object. - Then disconnect the two safety measuring leads from the BENNING CM 9-1. - Turn the rotary switch

to the switch setting “OFF”. The BENNING CM 9-1 is not equipped with a fuse.

9.1 Securing the instrument

Under certain circumstances safe operation of the BENNING CM 9-1 is no long- er ensured, for example in the case of: - Visible damage of the casing. - Incorrect measurement results. - Recognisable consequences of prolonged storage under improper condi- tions. - Recognisable consequences of extraordinary transportation stress. In such cases the BENNING CM 9-1 must be switched off immediately, discon- nected 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 instru- ment. 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.

9.3 Battery replacement

Before opening the BENNING CM 9-1, make sure that it is free of voltage! Electrical danger! The BENNING CM 9-1 is supplied by means of two 1.5 V batteries of type AAA (IEC LR03). Battery replacement is required, if the battery symbol appears on the display

. Proceed as follows to replace the batteries: - Disconnect the safety measuring leads from the measuring circuit. - Disconnect the safety measuring leads from the BENNING CM 9-1. - Set the rotary switch

to the switch setting “OFF”. - Lay the BENNING CM 9-1 face down and release the screws of the battery compartment cover. - Lift the battery compartment lid (in the housing recess area) from the bottom section. - Replace the exhausted batteries by two new ones of type AAA (LR03). Make sure that the new batteries are inserted with correct polarity! - Place the battery compartment cover onto the bottom part and tighten the screw. Seegure12: Batteryreplacement

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

Benningguaranteescompliancewiththetechnicalandaccuracyspecications statedintheoperatingmanualfortherst12monthsafterthedeliverydate. Tomaintainthespeciedaccuracyofthemeasurementresults,theinstrument must be recalibrated at regular intervals by our factory service. We recommend a recalibration interval of one year. Send the unit 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,10/ 2019

- 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 note

At the end of the product’s useful life, please dispose of the device at collection.10/ 2019