Operating manual 5191 / 07/2021 en BENNING CM 2-1 Translation of the German original version
Legal notice Legal notice Notes concerning the documentation Ensure that the applicable documentation is used for this product. For safe handling, knowledge that is provided in these instructions is required. The product may only be handled while following this documentation, particularly the safety instructions and warnings it contains. The personnel must be qualified for the respective task and have the capability to recognise risks and prevent possible dangers.
Table of contents Table of contents 1 2 Introduction................................................................................................................................................ 7 1.1 General notes........................................................................................................................ 7 1.2 History ................................................................................................................................... 8 1.
Table of contents 5.9.2 6 External conductor or phase testing.................................................................................... 35 Maintenance ............................................................................................................................................. 36 6.1 Maintenance schedule ........................................................................................................ 36 6.2 Making the device free of voltage .............................
Table of figures Table of figures Figure 1 BENNING CFlex 1 ....................................................................................................................... 15 Figure 2 BENNING TA 1 ............................................................................................................................ 15 Figure 3 BENNING TA 2 ............................................................................................................................
List of tables List of tables Table 1 History.......................................................................................................................................... 8 Table 2 Symbols on the device................................................................................................................. 11 Table 3 Symbols used in the operating manual........................................................................................ 11 Table 4 Low-pass filter..........
Introduction 1.1 General notes 1 Introduction The TRUE RMS digital current clamp multimeter BENNING CM 2‑1 described here (in the following only referred to as “device”) is intended for testing in circuits with a nominal voltage up to a maximum of 600 V‑AC or 600 V‑DC.
Introduction 1.2 History NOTE Disclaimer of liability Please make sure that any person using the device has read and understood the instructions of this operating manual before handling the device and that the instructions are adhered to in all points. Non-observance of this operating manual might result in product damage, property damage and/or personal injury. Benning assumes no liability for damage and malfunctions resulting from the failure to observe the instructions in this operating manual.
Introduction 1.3 Service & support 1.3 Service & support Please contact your specialty retailer or the BENNING Service Center for any repair or service work that might be required. Technical support Please contact our Technical support for technical questions on handling the device. Phone: Fax: E-Mail: Internet: +49 2871 93-555 +49 2871 93‑6555 helpdesk@benning.de www.benning.
Safety 2.1 Warning system 2 Safety 2.1 Warning system This operating manual contains notes that must be taken into consideration for your personal safety and in order to avoid injuries and damage to property. Warnings about your personal safety and to prevent personal injuries are marked with a warning triangle. Warnings on sole prevention of material damage are shown without a warning triangle. The warnings are shown in descending order depending on the hazard level as follows.
Safety 2.3 Symbols used 2.3 Symbols used Symbols on the device Symbol Meaning Application around and removal from hazardous live conductors is permitted. Please observe the information provided in this operating manual in order to avoid dangers. Warning of electrical danger! Please observe the information provided in this operating manual in order to avoid dangers.
Safety 2.4 Intended use 2.4 Intended use Only use the device within the framework of the corresponding technical data. Any operating conditions that deviate from this shall be considered as improper use. Solely the user of the device shall be liable for any resulting damage. In particular, note the following: • In case of improper use, the liability and warranty claims become void. Solely the user of the device shall be liable for any damage resulting from improper use.
Safety 2.4 Intended use WARNING Dangerous voltage Danger to life or serious injury is possible due to contact with high electric voltage in case of incorrect operation. • Do not touch the bare measuring probe tips of the safety measuring lines. • Connect the safety measuring lines to the correspondingly marked measuring jacks of the device and check them for tight fit. • Only use approved safety measuring lines.
Safety 2.5 Special types of risks 2.5 Special types of risks DANGER Bare conductors or main line carriers Danger to life or serious injury is possible due to contact with high electric voltage when working with bare conductors or main line carriers. • Please observe relevant regulations on occupational safety and health. • If necessary, use appropriate protective equipment.
Scope of delivery 2.5 Special types of risks 3 Scope of delivery The scope of delivery of the device includes the following components: • 1 x TRUE RMS digital current clamp multimeter BENNING CM 2‑1 • Safety measuring lines (item no.: 044145): – 1 x safety measuring line (red, l = 1.4 m) – 1 x safety measuring line (black, l = 1.4 m) • 1 x compact protective pouch • 2 x 1.
Scope of delivery 2.5 Special types of risks • Set of safety measuring lines BENNING TA 2 (item no.: 044125) Set of Ø 4 mm measuring lines, 6‑piece, red / black, professional version, consisting of: – Measuring lines (silicone) (CAT III 1 000 V) – Test probes (4 mm measuring probe, CAT II 1 000 V) – Alligator clips (CAT III 1 000 V) Figure 3: BENNING TA 2 • Set of safety measuring lines BENNING TA 3 (item no.
Device description 4.1 Device structure 4 Device description 4.1 Device structure 1 9 2 8 3 4 5 7 6 Figure 6: BENNING CM 2‑1 device structure 1 Measuring clamp (for clamping the conductor) 3 “HOLD / MIN MAX” key 5 Digital display 7 COM jack 9 Current clamp bulge (protection against contact with conductor) 2 “AC HFR / DCA ZERO” key 4 Rotary switch 6 “+” jack 8 Opening lever Rear panel of the device • Battery compartment with battery compartment cover The device is powered by two 1.
Device description 4.1 Device structure Rotary switch You can set the desired test or measurement by means of the rotary switch.
Device description 4.1 Device structure Digital display The digital display is divided into different sections: • Display of the currently set function and unit • Display range: 4‑digit liquid crystal display (LCD) with a font size of 14 mm and decimal points. The highest display value is 4 000 digits. • Battery status: Indicates the state of charge of the batteries (max. 3 segments). The batteries are discharged as soon as all segments have disappeared and the symbol is flashing.
Device description 4.2 Functions 4.2 Functions Use the rotary switch to switch the device on (desired measuring function) or off (“OFF”). The device confirms each operation of keys and the rotary switch with an acoustic signal. Invalid keystrokes are confirmed with a double beep. The device switches off automatically after approx. 20 minutes (APO, Auto-Power-Off). To switch the device back on, first set the rotary switch to switch position “OFF” and then set the desired measuring function. 4.2.
Device description 4.2 Functions “ZERO (DC)” function The “ZERO (DC)” function is intended to carry out a null balance before making direct current (DC) measurements. To carry out the null balance, press and hold the “AC HFR / DCA ZERO” key for approx. 2 s until the “Δ” symbol appears on the digital display. The device must not be in the vicinity of a live conductor. 4.2.2 “HOLD / MIN MAX” key The “HOLD / MIN MAX” key has two functions.
Device description 4.3 Measuring ranges 4.3 Measuring ranges The device is provided with an automatic switch-over of the measuring range. For this reason, a default setting is not required. If a measuring range is exceeded, this is indicated by “0L” or “-0L” and, depending on the measuring function, additionally by an acoustic warning. Please note that there will be no indication and warning in case of overload.
Device description 4.3 Measuring ranges 4.3.1 Voltage ranges AC voltage ranges (V‑AC) Overload protection: 600 V‑AC / V‑DC Measuring range Resolution Measuring accuracy 400 mV 4V 40 V 400 V 600 V 0.1 mV 0.001 V 0.01 V 0.1 V 1V ±(1.5 % + 5 digits) ±(1.
Device description 4.3 Measuring ranges 4.3.2 Current ranges AC ranges (A‑AC) Overload protection: 400 A‑AC / A‑DC Measuring range Resolution 40 A 400 A 0.01 A 0.1 A Measuring accuracy 15 … 500 Hz 0.5 … 1 kHz ±(2.5 % + 5 digits) ±(3.5 % + 5 digits) Table 8: AC ranges (A-AC) • Frequency range: 15 Hz … 1 kHz DC ranges (A‑DC) Overload protection: 400 A‑AC / A‑DC Measuring range Resolution Measuring accuracy 40 A 400 A 0.01 A 0.1 A ±(2.5 % + 5 digits) Table 9: DC ranges (A-DC) 4.3.
Device description 4.3 Measuring ranges 4.3.5 Diode test Overload protection: 600 V‑AC / V‑DC Measuring range Resolution Measuring accuracy 1.5 V 0.001 V ±(1.5 % + 5 digits) Table 12: Diode test • Open-circuit voltage: approx. 1.8 V 4.3.6 Capacitance ranges Requirements: Discharge the capacitors and apply the safety measuring lines according to the marked polarity. Overload protection: 600 V‑AC / V‑DC Measuring range Resolution Measuring accuracy 1 μF 10 μF 100 μF 1 mF 10 mF 0.001 μF 0.
Operation 5.1 Requirements for tests and measurements 5 Operation The device enables you to carry out various tests and measurements. 5.1 Requirements for tests and measurements • Remove the device (safety measuring lines) from the measuring point before setting a switch position on the rotary switch of the device. • Only use approved safety measuring lines [} page 27]. • Please consider sources of interference that might be present.
Operation 5.2 Connecting the safety measuring lines 5.2 Connecting the safety measuring lines For certain tests and measurements, it is necessary to connect the safety measuring lines to the device. Requirements • Please observe the requirements for measuring [} page 26]. • Safety measuring lines The safety measuring lines must be approved for the device (e. g. safety measuring lines included in the scope of delivery) and be in a technically perfect and operationally safe condition.
Operation 5.3 Voltage or frequency measurement 5.3 Voltage or frequency measurement Requirements • Please observe the requirements for measuring [} page 26].
Operation 5.3 Voltage or frequency measurement Figure 11: DC voltage measurement Procedure 1. Set the rotary switch of the device to switch position “Hz ” or “Volt Sense / Lo‑Z Auto‑V”. – “Hz ”: Press the “AC HFR / DCA ZERO” key to set the desired measuring function (frequency, AC or DC voltage). – “Volt Sense / Lo‑Z Auto‑V”: The corresponding measuring function (AC or DC voltage) and the optimum measuring range are set automatically. The input resistance is reduced to approx.
Operation 5.4 Current or frequency measurement 5.4 Current or frequency measurement Requirements • Please observe the requirements for measuring [} page 26]. • Make sure that no voltage is applied to the jacks of the device (“COM” and “+”). Remove any connected safety measuring lines. • Current ranges [} page 24] and frequency ranges [} page 25] Figure 12: Current or frequency measurement Procedure 1. Set the rotary switch of the device to switch position “Hz ”. 2.
Operation 5.5 Resistance measurement 5.5 Resistance measurement Requirements • Please observe the requirements for measuring [} page 26]. • Approved safety measuring lines • Resistance ranges [} page 24] Figure 13: Resistance, capacitance measurement, continuity or diode testing Procedure 1. Set the rotary switch of the device to switch position “ ”. The “Resistance measurement” function is set automatically (“Ω” is displayed, “ ” is hidden). 2.
Operation 5.6 Continuity testing 5.6 Continuity testing Requirements • Please observe the requirements for measuring [} page 26]. • Approved safety measuring lines • Continuity test [} page 24] • Please observe the figure for continuity testing. [} page 31] Procedure 1. Set the rotary switch of the device to switch position “ ”. 2. Connect the safety measuring lines to the device [} page 27]. 3. Press the “AC HFR / DCA ZERO” key to set the desired “Continuity test” function (“ ” symbol). 4.
Operation 5.8 Diode testing 5.8 Diode testing Requirements • Please observe the requirements for measuring [} page 26]. • Approved safety measuring lines • Diode test [} page 25] • Please observe the figure for diode testing [} page 31]. Procedure 1. Set the rotary switch of the device to switch position “ ”. 2. Connect the safety measuring lines to the device [} page 27]. 3. Press the “AC HFR / DCA ZERO” key to set the desired “Diode test” function (“ ” symbol). 4.
Operation 5.9 Voltage indicator 5.9.1 Non-contact phase testing There is a detector located on the top of the device. This detector enables non-contact detection of alternating fields. Requirements • Please observe the requirements for measuring [} page 26]. • Make sure that no voltage is applied to the jacks of the device (“COM” and “+”). Remove any connected safety measuring lines. Figure 14: Non-contact phase testing Procedure 1.
Operation 5.9 Voltage indicator 5.9.2 External conductor or phase testing Requirements • Please observe the requirements for measuring [} page 26]. • Approved red safety measuring line • Make sure that no voltage is applied to the COM jack of the device. Remove a connected black safety measuring line. Procedure 1. Set the rotary switch of the device to switch position “Volt Sense / Lo‑Z Auto‑V”. 2. Connect the red safety measuring line to the “+” jack of the device [} page 27]. 3.
Maintenance 6.1 Maintenance schedule 6 Maintenance The battery compartment may be opened for maintenance work. Apart from that, there are no components in the device that you can replace. WARNING Opening the device Danger to life or serious injury is possible due to contact with high electric voltage when opening the device. The device might get damaged. • Make sure that the device is free of voltage before opening the battery compartment. • Do not open the device (except for the battery compartment).
Maintenance 6.3 Cleaning the device 6.3 Cleaning the device Clean the device regularly and as the need arises. Make sure that the battery compartment and the battery contacts are not contaminated by leaking battery electrolyte. Requirements • A clean and dry cloth or special cleaning cloth • Voltage-free device [} page 36] NOTICE Wrong cleaning agents Using the wrong cleaning agents can damage the device. • Do not use any solvents, abrasives or polishing agents. Procedure 1.
Maintenance 6.4 Replacing the batteries 6.4 Replacing the batteries The device is powered by two 1.5 V micro batteries (AAA / IEC LR03). Replace the batteries as soon as they are discharged. Requirements • Discharged batteries inside the device (all segments of the battery symbol on the digital display have disappeared and the battery symbol is flashing) • 2 new 1.5 V micro batteries (AAA / IEC LR03) • Voltage-free device [} page 36] Figure 15: Battery replacement (exemplary) Procedure 1.
Technical data 6.5 Calibrating the device 7 Technical data Protection class Contamination level Protection category (DIN VDE 0470-1, IEC / EN 60529) Overvoltage category Housing dimensions (length x width x height) Max. clamp opening Weight (batteries included) Battery life (alkaline batteries) Safety measuring lines (item no.
Disposal and environmental protection 6.5 Calibrating the device 8 Disposal and environmental protection At the end of product life, dispose of the unserviceable device and the batteries via appropriate collecting facilities provided in your community.
Index Index A AC ranges (A‑AC) AC voltage ranges (V‑AC) Accessories H 24 23 15 Intended use 38 7 38 32 25 37 7 24 32 2 30 D DC ranges (A‑DC) DC voltage ranges (V‑DC) Device Calibrating Cleaning Securing Digital display Diode test Diode testing Disclaimer Disposal Documentation 24 23 38 37 13 19 25 33 2, 12 40 2 E Environmental protection External conductor testing 40 35 5191 / 07/2021 en K Key AC HFR / DCA ZERO HOLD / MIN MAX 20 21 L Low-pass filter Measuring ranges 20 22 M Maintenance Mainte
Index Resistance measurement Resistance ranges Return address Returns management Rotary switch 31 24 9 9 18 S Safety measuring lines Connecting Scope of delivery Securing Service & Support Technical support Standards applied Symbols Device Operating manual 27 15 13 9 10 11 11 T Target group Technical data Technical support Test Requirements Trademarks 7 39 9 26 8 V Voltage indicator Practical tip Voltage measurement Voltage ranges (LoZ, AutoV) Voltage-free 34, 35 34 29 23 36 W Warning system Warran
5191 / 07/2021 en BENNING CM 2-1 43
Münsterstraße 135 - 137 D - 46397 Bocholt Phone: +49 2871 93-0 Fax: +49 2871 93-429 Internet: www.benning.de 44 E-Mail: duspol@benning.de BENNING CM 2-1 The text and illustrations correspond to the state of technology at the time of printing. Subject to technical changes. No liability accepted for printing errors. BENNING Elektrotechnik und Elektronik GmbH & Co.
