MM 71 - Multimeter BENNING - Free user manual and instructions

USER MANUAL MM 71 BENNING

D F E I S Auto Sense Lo-Z AC+DC Peak MAX MIN HOLD

D F E I S Auto Sense Lo-Z AC+DC Peak MAX MIN HOLD

D F E I S Auto Sense Lo-Z AC+DC Peak MAX MIN HOLD

D F E I S Auto Sense Lo-Z AC+DC Peak MAX MIN HOLD

Digital Multimeter for - DC voltage measurement - AC voltage measurement - DC current measurement - AC current measurement - Resistance measurement - Diode testing - Continuity testing - Capacity measurement - Frequency measurement - Temperature measurement Contents:

3. Scope of delivery

4. Description of unit

8. Measuring with the BENNING MM 7-1

11. Technical data of the measuring accessories

12. Environmental note

1. Operating Instructions

This operating manual is intended for: - electricians and - qualified electrotechnical persons The BENNING MM 7-1 is designed for measurements in dry surroundings. It must not be used in electrical circuits with rated voltages higher than 1000 V DC/ AC (for more details, see section 6 “Ambient conditions”). The following symbols are used in the operating manual and on the BENNING MM 7-1 itself: Attention! Magnets might affect the correct functioning of cardiac pacemakers and implanted defibrillators. As a user of such medical devices, keep a sufficient distance to the magnet.

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 followed with in order to avoid risks.

This symbol on the BENNING MM 7-1 indicates that the unit is protection insulated (safety class II). This symbol on the BENNING MM 7-1 indicates the fuses which it contains. This symbol on the BENNING MM 7-1 means that the BENNING MM 7-1 complies with the EU directives. This symbol appears on the display for a discharged battery. This symbol indicates the “continuity-testing” application. The buzzer provides an audible signal. This symbol indicates the “diode-testing” application. This symbol marks the range “capacity testing”. (DC) voltage or current. (AC) voltage or current.02/ 2020

Earth (voltage to earth).

The instrument is built and tested in accordance with DIN VDE 0411 part 1/EN 61010-1 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 maintain this condition and to ensure safe operation of the multimeter, 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!

Attention! Magnets might affect the correct functioning of cardiac pacemakers and implanted defibrillators. As a user of such medical devices, keep a sufficient distance to the magnet.

The BENNING MM 7-1 may be used only in electrical circuits of over voltage category III with a maximum voltage of 1000 V or of over voltage category IV with a maximum voltage of 600 V between the conductor and ground. 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 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 multimeter, always check it as well as all measuring leads and wires for signs of damage. Should it appear that safe operation of the multimeter is no longer possible, it should be shut down immediately and secured to prevent that it is switched on accidentally. It may be assumed that safe operation is no longer possible: - if the instrument or the measuring leads show visible signs of damage, or - if the multimeter no longer works, or - after long periods of storage under unfavourable conditions, or - after being subject to rough transportation, or - if the device or the measuring leads are exposed to moisture.

In order to avoid danger, - do not touch the bare probe tips of the measuring leads, - insert the measurement leads in the appropriately designated measuring sockets on the multimeter

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

3. Scope of delivery

The following items make up the standard BENNING MM 7-1 package:

3.1 one BENNING MM 7-1,

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 wire temperature sensor, type K

3.5 one protective rubber holster,

3.6 one magnetic holder with adapter and strap02/ 2020

3.7 one compact protection carrying case,

3.8 one 9-V block battery and two different fuses (integrated in the new unit

when it is supplied),

one operating manual. Note on optional accessory: - Temperature probe (K-type) made of V4A tube application: insertion probe for soft-plastic materials, liquids, gas and air measuring range: - 196 °C up to 800 °C dimensions: length = 210 mm, tube length = 120 mm, tube diameter = 3 mm, V4A (P.no. 044121) Note on replaceable parts: - The BENNING MM 7-1 contains fuses for overload protection: One fuse rated 11 A rapid-acting (1000 V) 30 kA, D = 10 mm, L = 38 mm (P.no. 10218772) and one fuse rated 440 mA rapid-acting (1000 V), D = 10 mm, L = 34.9 mm (P.no. 10016655).

The BENNING MM 7-1 is powered by one 9-V block battery (IEC 6 LR 61). - The above mentioned safety cable (tested spare part) are approved in accordance with CAT III 1000 V/ CAT IV 600 V and for a current up 10 A.

4. Description of unit

See fig. 1: Front panel The display and operating elements shown in fig. 1 are as follows:

Digital display, for the measurement reading, bar graph and display for overrange indication,

RANGE key, switchover between automatic and manual measuring range,

VoltSensor key, for determining AC voltage to earth,

MIN/MAX key, storage of highest and lowest measurement value or peak value,

Function key (blue), for direct voltage/ current (DC) or alternating voltage/ current (AC), resistance or capacity measurement, continuity or diode test- ing, frequency measurement, temperature measurement in °C or °F,

Rotating switch, for selecting measuring function.

COM socket, joint socket for measurement of current, voltage, resistance, frequency, temperature, capacity, continuity and diode testing,

Socket (positive), for mA range, for currents up to 600 mA,

Socket (positive), for 10-A range, for currents up to 10 A,

) The automatic polarity display for DC current and voltage refers to this.

5.1.1 The digital display is designed as a 4 digit liquid-crystal indicator with 14 mm

digit height and decimal point. The highest value displayed is 6000.

5.1.2 The bar graph display consists of 62 segments.

functions automatically. Only a polarity con- trary to the socket definition is indicated, as “-”.

5.1.4 The range overload will be displayed with “OL” or “-OL” and sometimes

with an acoustic signal. Attention: no display or warning by complete overload.

can be used to change over to the manual meas- uring ranges and to hide “AUTO” on the display at the same time. By pressing the key for approx. 2 seconds, the automatic range selection is activated (“AUTO” on the display).

: The voltage indicator function is intended for local- izing AC voltages to earth (see 8.9).

5.1.7 The “MIN/MAX” key function records and stores the highest and low-

est measurements automatically. By pressing the button several times, the following values are shown: Display “MAX/MIN” shows the current measurement value, “MAX” shows the highest value stored and “MIN” the lowest value stored. The “HOLD” key serves to interrupt the “MIN/ MAX” function. When the key is pressed for 2 sec. the unit switches back to normal mode. Press the “MIN/MAX” key

for 2 seconds to switch over to the “PEAK” function (peak value storage). The “PEAK” function detects and stores the positive and negative peak/ crest value (> 1 ms) in the mV, V AC/ DC and mA, A AC/ DC function. The02/ 2020

automatic range selection is deactivated in the MIN/ MAX and PEAK function.

5.1.8 “Smart HOLD” - storage of measurement reading: When the “Smart

HOLD” key is pressed, the measurement reading is stored in the memory. The symbol “HOLD” appears in the display at the same time. If the measured value increases by 50 digit above the saved value the change in measured value is shown by a blinking display and by a signal tone. (changes of measured values between AC and DC voltage/ current will not be recognized).

switches the display illumination on. To switch it off, press the yellow key again.

serves to select the secondary or third func- tion of the rotary switch position. Switch position Function

5.1.11 The nominal measurement rate of the BENNING MM 7-1 is 3 measure-

ments per sec. for the digital display.

5.1.12 The BENNING MM 7-1 is switched on and off by the rotating switch

Switch-off position “OFF”.

5.1.13 The BENNING MM 7-1 switches off automatically after approx. 20

minutes (APO, Auto-Power-Off). It switches back on again when the HOLD key (or another) is pressed. Deactivate the automatic switch-off by pressing the function key (blue)

and simultaneously switching the BENNING MM 7-1 ON from the switch position “OFF”.

5.1.14 Check the segments of the digital display by pressing the “Smart

and simultaneously switching the BENNING MM 7-1 ON from the switch position “OFF”.

5.1.15 Temperature coefficient of measurement value: 0.15 x (stated meas-

urement accuracy)/ °C < 18 °C or > 28 °C relative to the value at the reference temperature of 23 °C.

5.1.16 The BENNING MM 7-1 is powered by one 9-V block battery (IEC 6 LR 61).

permanently shows the remaining battery capac- ity over a maximum 3 segments.

As soon as all segments in the battery symbol have gone off and the battery symbol blinks please exchange the battery for a new battery immediately in order to avoid a risk through false measurements for people.

5.1.18 The life span of a battery is approx. 180 hours (alkali battery).

5.1.19 Appliance dimensions:

(L x W x H) = 180 x 88 x 33.5 mm without protective rubber holster (L x W x H) = 190 x 94 x 48 mm with protective rubber holster Weight: 320 g without protective rubber holster 460 g with protective rubber holster

5.1.20 The safety measuring leads are expressly suitable for the rated voltage

and power of the BENNING MM 7-1.

5.1.21 The BENNING MM 7-1 is protected against mechanical damage by a

makes it possible to suspend the BENNING MM 7-1 during the measuring process or to stand it upright.

6. Ambient conditions

- The BENNING MM 7-1 is designed only for measuring in dry surroundings, - Maximum barometric height during measurement: 2000 m. - Overvoltage category / setting category: IEC 60664/ IEC 61010-1 → 600 V02/ 2020

cate gory IV; 1000 V category III. - Degree of contamination: 2. - 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: At operating temperatures of 0 °C to 30 °C: relative humidity under 80 %. At operating temperatures of 30 °C to 40 °C: relative humidity under 75 %. - At operating temperatures of 40 °C to 50 °C: relative humidity under 45 %. - Storage temperature: The BENNING MM 7-1 can be stored at tempera- tures from - 20 °C to + 60 °C (humidity 0 up to 80 %). The batteries must be removed from the unit.

Note: The measurement accuracy is stated as the sum of - a relative proportion of the measurement value and - a number of digits (i.e. numerical steps of the last place). This measurement accuracy applies for a temperature of 18 °C to 28 °C and a maximum relative humidity of max. 80 %.

7.1 DC voltage ranges

The input resistance is 10 MΩ parallel < 100 pF. The measurement value is obtained as a true RMS value and displayed as such. With non-sinusoidal curves, the value displayed is less accurate. This results in an additional error for the following crest factors: Crest factor of 1.4 to 2.0, additional error + 1.0 %. Crest factor of 2.0 to 2.5, additional error + 2.5 %. Crest factor of 2.5 to 3.0, additional error + 4.0 %. AC Measuring range Resolution Measurement accuracy in frequency range 50 Hz - 1 kHz Overload protection 60 mV 10 µV ± (1.2 % of reading + 10 digits) 1000 V eff 600 mV 100 µV ± (1.2 % of reading + 10 digits) 1000 V eff 6 V 1 mV ± (0.8 % of reading + 5 digits) 1000 V eff 60 V 10 mV ± (0.8 % of reading + 5 digits) 1000 V eff 600 V 100 mV ± (0.8 % of reading + 5 digits) 1000 V eff 1000 V 1 V ± (0.8 % of reading + 5 digits) 1000 V eff AC+DC Measuring range Measurement accuracy in frequency range 50 Hz - 1 kHz mV ± (2 % of reading + 15 digits) V ± (2 % of reading + 10 digits)

7.3 AutoV, “LoZ” range

The low-impedance input resistance of approx. 3 kΩ serves to suppress induc- tive and capacitive voltages. Measuring range Resolution Measurement accuracy Overload protection 600 V

7.4 DC current ranges

Overload protection: - 440 mA (1000 V) fuse, 11 kA, rapid on mA input - 11 A (1000 V) fuse, 30 kA, rapid on 10 A input Max. measuring time: - 10 A range: 3 minutes (pause > 20 minutes) - 600 mA range: 10 minutes (pause > 20 minutes) Measuring range Resolution Measurement accuracy 60 mA 10 µA ± (0.8 % of reading + 5 digits) 600 mA 100 µA ± (0.8 % of reading + 5 digits) 6 A 1 mA ± (0.8 % of reading + 5 digits) 10 A 10 mA ± (0.8 % of reading + 5 digits)

7.5 AC/ AC+DC current ranges

The measurement value is obtained as a true RMS value and displayed as such. With non-sinusoidal curves, the value displayed is less accurate. This results in an additional error for the following crest factors: Crest factor of 1.4 to 2.0, additional error + 1.0 %. Crest factor of 2.0 to 2.5, additional error + 2.5 % Crest factor of 2.5 to 3.0, additional error + 4.0 % Overload protection: - 440 mA (1000 V) fuse, 11 kA, rapid on mA input - 11 A (1000 V) fuse, 30 kA, rapid on 10 A input Max. measuring time: - 10 A range: 3 minutes (pause > 20 minutes) - 600 mA range: 10 minutes (pause > 20 minutes) AC Measuring range Resolution Measurement accuracy in frequency range 50 Hz - 1 kHz 60 mA 10 µA ± (1.2 % of reading + 5 digits) 600 mA 100 µA ± (1.2 % of reading + 5 digits) 6 A 1 mA ± (1.2 % of reading + 5 digits) 10 A 10 mA ± (1.2 % of reading + 5 digits) AC+DC Measuring range Measurement accuracy in frequency range 50 Hz - 1 kHz mA ± (2 % of reading + 10 digits) A ± (2 % of reading + 10 digits)

7.6 Resistance ranges

Overload protection: 1000 V AC/ DC Measuring range Resolution Measurement accuracy Max. meas. current Max. no-load voltage 600 Ω 0.1 Ω ± (0.8 % of reading + 5 digits

7.8 Continuity testing

Overload protection: 1000 V AC/ DC The built-in buzzer sounds in the case of a resistance R less than 30 Ω up to 100 Ω. For a resistance R higher than 100 Ω, the buzzer does not emit an acoustic signal.02/ 2020

Conditions: capacitors discharged and connected in accordance with the polar- ity stated. Overload protection: 1000 V AC/ DC Measuring range Resolution Measurement accuracy 1 µF 1 nF ± (1.2 % of reading + 5 digits) 10 µF 10 nF ± (1.2 % of reading + 5 digits) 100 µF 100 nF ± (1.2 % of reading + 5 digits) 1 mF 1 µF ± (1.2 % of reading + 5 digits) 10 mF 10 µF ± (1.2 % of reading + 5 digits) Max. measuring time: 0.7 seconds for 1 nF - 1 mF 3 seconds for 1 mF - 10 mF

Frequency ranges Overload protection: 1000 V AC/ DC Measuring range Resolution Measurement accuracy 100 Hz 0.01 Hz ± (0.1 % of reading + 2 digits) 1 kHz 0.1 Hz ± (0.1 % of reading + 2 digits) 10 kHz 1 Hz ± (0.1 % of reading + 2 digits) 100 kHz 10 Hz ± (0.1 % of reading + 2 digits) Minimum frequency: 1 Hz Minimum sensitivity: > 5 V

Overload protection: 1000 V AC/ DC Measuring range Resolution Measurement accuracy* - 40 °C to 400 °C

• The measuring accuracy of the K-type temperature sensor has to be added to the specified measuring accuracy. Wire temperature sensor (type K): Measuring range: - 60 °C to 200 °C Measurement accuracy: ± 2 °C The measuring accuracy applies to stable ambient temperatures < ± 1 °C. After a change of the ambient temperature of ± 2 °C, the measuring accuracy data will apply after 1 hour.

8. Measuring with the BENNING MM 7-1

8.1 Preparation for measuring

Store and use the BENNING MM 7-1 only under the correct temperature condi- tions stated. Always avoid longer exposure to sunlight. - Check the rated voltage and rated current stated on the safety measuring leads. The safety measuring leads supplied with the unit are suitable for the rated voltage and current of the BENNING MM 7-1. - Check the insulation of the safety measuring leads. If the insulation is dam- aged in any way, do not use the leads. - Check the continuity of the safety measuring leads. If the conductor in the safety measuring lead is interrupted, do not use the leads. - Before selecting another function with the rotating switch

, always discon- nect the safety measuring leads from the measuring point. - Sources of strong current in the vicinity of the BENNING MM 7-1 may cause unstable or incorrect readings.

8.2 Voltage and current measurement

Always observe the maximum voltage to earth potential! Electrical hazard! The maximum voltage which may be applied to the sockets - COM- socket

- socket for V, Ω, Hz, ,

- socket for mA range

and the - socket for 10 A range

of the BENNING MM 7-1 to earth is 600 V CAT IV/ 1000 V CAT III.

8.2.1 Voltage measurement

, select the desired function ( , , , AutoV/ LoZ) on the BENNING MM 7-1. - Select the voltage type to be measured (direct voltage DC, alternating volt- age AC or AC+DC) by means of the blue key

of the BENNING MM 7-1. - Connect the black safety measuring lead to the COM socket

on the BENNING MM 7-1. - Connect the red safety measuring lead to the socket

for V, Ω, Hz, , on the BENNING MM 7-1. - Connect the safety measuring leads to the measuring points. Read the meas- urement value displayed in the digital display

, the “AutoV/ LoZ” function is displayed by the “Auto Sense/ Lo-Z” symbol. It automatically determines the required measuring func- tion (AC/ DC voltage) and the ideal measuring range. Moreover, the input resist- ance is reduced to approx. 3 kΩ in order to suppress inductive and capacitive voltages (reactive voltages).

8.2.2 Current measurement

, select the desired range and function (mA or A) on the BENNING MM 7-1. - Select the current type to be measured (direct current DC, alternating cur- rent AC or AC+DC) by means of the blue key

Connect the black safety measuring lead to the COM socket

on the BENNING MM 7-1. - Connect the red safety measuring lead to the socket for mA range,

for current up to 600 mA or to the socket for the 10 A range,

for currents greater than 600 mA up to 10 A on the BENNING MM 7-1. - Connect the safety measuring leads to the measuring points. Read the meas- urement value displayed in the digital display

of the BENNING MM 7-1. See fig. 4: DC-current measurement See fig. 5: AC-current measurement

8.3 Resistance measurement

, select the desired function (Ω, ) on the BENNING MM 7-1. - Connect the black safety measuring lead to the COM socket

on the BENNING MM 7-1. - Connect the red safety measuring lead to the socket

for V, Ω, Hz, , on the BENNING MM 7-1. - Connect the safety measuring leads to the measuring points. Read the meas- urement value displayed in the digital display

of the BENNING MM 7-1.02/ 2020

See fig. 6: Resistance measurement

on the BENNING MM 7-1, switch to diode testing. - Connect the black safety measuring lead to the COM socket

on the BENNING MM 7-1. - Connect the red safety measuring lead to the socket

for V, Ω, Hz, , on the BENNING MM 7-1. - Contact the diode connections with the safety measuring leads and read the measurement value displayed in the digital display

of the BENNING MM 7-1. - For a normal silicone diode located in flow direction, the flow voltage between 0.4 V and 0.8 V is displayed. If “000” appears in the display, there may be a short circuit in the diode. - If no forward voltage is detected, first check the polarity of the diode. If still no forward voltage is displayed, the forward voltage of the diode is beyond the measuring limits. See fig. 7: Diode testing

8.5 Continuity testing with buzzer

, select the desired function ( , ) on the BENNING MM 7-1. - Connect the black safety measuring lead to the COM socket

on the BENNING MM 7-1. - Connect the red safety measuring lead to the socket

for V, , Hz, , on the BENNING MM 7-1. - Contact the measuring points with the safety measuring leads. If the meas- uring lead resistance between the COM socket

for V, , Hz, , on the BENNING MM 7-1 is lower than 30 Ω to 100 Ω the built-in buzzer is activated. See fig. 8: Continuity testing with buzzer

Discharge capacitors fully before measurement! Never apply voltage to the sockets for capacitance measurement as this may cause irreparable damage to the unit. A damaged unit may represent an electrical hazard! - With the rotating switch

to switch over to the capacity measurement function. - Determine the polarity of the capacitor and discharge it completely. - Connect the black safety measuring lead to the COM socket

on the BENNING MM 7-1. - Connect the red safety measuring lead to the socket

for V, , Hz, , on the BENNING MM 7-1. - Contact the discharged capacitor with the safety measuring leads observing correct polarity. Read the measurement value on the digital display

of the BENNING MM 7-1. See fig. 9: Capacity measurement

8.7 Frequency measurement

to switch over to the frequency measurement func- tion. - Connect the black safety measuring lead to the COM socket

on the BENNING MM 7-1. - For frequency measurement in the voltage range , connect the red safety measuring lead to the jack for V, , Hz, ,

of the BENNING MM 7-1. - For frequency measurement in the voltage range , , connect the red safety measuring lead to the A jack

of the BENNING MM 7-1. - Remember the minimum sensitivity for frequency measurements using the BENNING MM 7-1! - Contact the measuring points with the safety measuring leads and read the measurement result on the digital display

8.8 Temperature measurement

to switch over to °F or °C. - Connect the adapter for the temperature sensor correctly to the socket COM

; observe polarity. - Connect the temperature sensor (type K) to the adapter. - Place the contact point (end of the sensor lead) on the point to be measured. Read the measurement value on the digital display

of the BENNING MM 7-1. See fig. 11: Temperature measurement

The voltage indicator function is not intended for testing the absence of voltage. Even without an indication or acoustic signal, a dangerous contact voltage might be applied. Electrical danger! The voltage indicator function is possible from each position of the rotary switch (except for switch position “OFF”). No measuring lines are required as voltage indicator (non-contact detection of an alternating field). The detector is located on the top side of the BENNING MM 7-1. Press the “VoltSensor” key

and the measured value indication disappears. If a phase voltage is localized, an acoustic signal will be emitted and the signal intensity of the alternating field will be indicated on the display by a maximum of 4 bars. An indication is made in earthed AC current networks only! The phase can be determined by means of a single-pole measuring line. Practical hint: Interruptions (cable breaks) in cables lying around openly such as e.g. cable reels, fairy lights etc. can be traced from the feeding point (phase) to the point of interruption. Functional range: ≥ 230 V See figure 12: Voltage indicator with buzzer

- Connect the red safety measuring lead to the jack for V, Ω, Hz, ,

and bring the safety measuring line into contact with the measuring point of the system part. - If an acoustic signal is emitted and bars are indicated on the display, the phase of an earthed alternating voltage is applied to this measuring point (system part).

Before opening the BENNING MM 7-1, ensure that it is not connected to a source of voltage! Electrical hazard! Any work required on the BENNING MM 7-1 when it is under voltage must be done only by a qualified electrician. Special steps must be taken to prevent accidents. Before opening the BENNING MM 7-1, remove it from all sources of voltage as follows: - First remove both safety measuring leads from the measurement points. - Remove both safety measuring leads from the BENNING MM 7-1 - Turn the rotating switch

Under certain circumstances, the safety of the BENNING MM 7-1 can no longer be guaranteed. This may be the case if: - there are visible signs of damage on the unit, - errors occur in measurements,

the unit has been stored for a long period of time under the wrong conditions, and - if the unit has been subjected to rough handling during transport. In these cases, the BENNING MM 7-1 must be switched off immediately, removed from the measuring points and secured to prevent it from being used again.

Clean the outside of the unit with a clean dry cloth. (Exception: any type of special cleaning cloth). Never use solvents or abrasives to clean the testing unit. Ensure that the battery compartment and the battery contacts have not been contaminated by electrolyte leakage. If any electrolyte or white deposits are seen near to the battery or in the battery compartment, remove them with a dry cloth, too.02/ 2020

9.3 Battery replacement

Before opening the BENNING MM 7-1, ensure that it is not connected to a source of voltage! Electrical hazard! The BENNING MM 7-1 is powered by 9-V block battery. The battery must be replaced (see fig. 13) when the battery symbol

appears in the display

To replace the battery, proceed as follows: - First remove the safety measuring leads from the measurement circuit. - Remove the safety measuring leads from the BENNING MM 7-1. - Turn the rotating switch

to “OFF”. - Remove the protective rubber holster

from the BENNING MM 7-1. - Lay the BENNING MM 7-1 on its front and loosen the screw from the cover of the battery compartment. - Lift the battery compartment cover (at the recesses in the housing) off the bottom part. - Lift the discharged battery out of the battery compartment and remove the battery leads carefully from the battery. - Connect the new battery with the battery leads and arrange them in such a way that they are not crushed between the two halves of the housing. Then place the battery in the correct position in the battery compartment. - Clip the battery cover onto the bottom part and tighten the screw. - Replace the BENNING MM 7-1 in its protective rubber holster

Remember the environment! Do not dispose of used batteries with domestic waste. Dispose of them at a battery-collection point or as toxic waste. Your local authority will give you the information you need.

9.4 Fuse replacement

Before opening the BENNING MM 7-1, ensure that it is not connected to a source of voltage! Electrical hazard! The BENNING MM 7-1 is protected from overloading by two integrated melt fuses (440 mA and 11 A rapid acting) (see fig. 14) To replace the fuses, proceed as follows: - Disconnect the safety measuring leads from the measurement circuit. - Disconnect the safety measuring leads from the BENNING MM 7-1. - Turn the rotating switch

to the “OFF” position. - Remove the protective rubber holster

from the BENNING MM 7-1. - Lay the BENNING MM 7-1 on its front and loosen the screw from the cover of the battery compartment. - Lift the battery-compartment cover (at recesses in housing) off the bottom part.

Do not loosen any of the screws on the printed circuit of the BENNING MM 7-1! - Remove the two outer screws (black) and the two screws beside the printed circuit from the base of the housing. - Lift the housing base at the bottom and remove it from the top of the front part. - Lift one end of the defective fuse out of the fuse holder. - Push the defective fuse out of the fuse holder completely. - Replace the defective fuse with another of the same rated power, same triggering characteristics and same dimensions. - Push the new fuse into the centre of the holder. - Arrange the battery leads in such a way that they are not crushed between the housing parts. - Clip the housing base into the front part and replace the four screws. - Clip the battery cover onto the bottom part and tighten the screw. - Replace the BENNING MM 7-1 in its protective rubber holster

Benning guarantees compliance with the technical and accuracy specifications stated in the operating manual for the first 12 months after the delivery date. To maintain the specified accuracy 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:02/ 2020

- The safety measuring leads can be stored by coiling them round the protec- tive rubber holster

and clipping the probe into the holster

so that they are sufficiently protected (see fig. 15) - You can clip one lead onto the protective rubber holster

in such a way that the measuring probe projects. This allows you to bring the measuring probe and the BENNING MM 7-1 up to the measuring point together. - The support at the back of the holster

can be used to prop the BENNING MM 7-1 up in a diagonal position (to make reading easier) or to suspend it (see fig. 16). - The protective rubber holster

has an eyelet for suspending the unit in a convenient position. See fig. 15: Winding up the safety measuring leads See fig. 16: Standing up the BENNING MM 7-1

11. 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 measuring leads if in perfect and clean condition as well as according to this manual, since the protection provided could otherwise be impaired. - Throw the measuring lead out if the insulation is damaged or if there is a break in the lead/ plug. - Do not touch the bare contact tips of the measuring lead. Only grab the area appropriate for hands! - Insert the angled terminals in the testing or measuring device.

12. Environmental notice

At the end of the product’s useful life, please dispose of it at appropriate collection points provided in your country.02/ 2020

7.1 Plages de tensions continues DC