Benning CM 7 Operating and installation instructions

BENNING

CM7 Electrical Tester

Service Information

TABLE OF CONTENTS Page

Introduction 1

Precautions and Safety Information 1

Symbols 1

Safety 2

Specifications 3

General Specification 3

Voltage Specification 4

Resistance & Continuity Specification 4

Current Specification 5

Frequency Specification 5

Physical and environment characteristics 7

Certification and compliance 7

Required Equipment 8

Basic Maintenance 9

Opening the Meter Case 9

Replacing the Battery 9

Performance Tests 10

Testing the Voltage Function 10

Testing the Resistance Function 11

Testing the AC Current Function 12

Testing the DC Current Function 12

Testing the Hz Function 13

Calibration 14

Calibrating DCV, ACV, ACA Functions 14

Introduction

Warning

To avoid shock or injury, do not perform the verification tests or calibration procedures

described in the manual unless you are qualified to do so.

The information provided in this document is for the use of qualified personnel only.

Caution

The CM7 contain parts that can be damaged by static discharge.

Follow the standard practices for handling static sensitive devices.

For additional information about BENNING GMBH & CO. KG. and its products, and

services, visit BENNING GMBH & CO. KG. web site at:

www.benning.de

Precautions and Safety Information

Use the Meter only as described in the Service Manual. If you do not do so, the protection provided

by the Meter may be impaired. Read the “Safety Information” page before servicing this product.

In this manual, a Warning identifies conditions and actions that pose hazard (s) to the user; a

Caution identifies conditions and actions that may damage the Meter or the test instruments.

The Symbols

The symbols used on the Meter and in this manual are explained in Table 1.

Table A. The Symbols

Risk of electric shock

See instruction card

DC measurement

Equipment protected by double or reinforced

insulation

Battery

Earth

AC measurement

Conforms to EU directives

SAFETY

Review the following safety precautions to avoid injury and prevent damage to this product or

products connected to it. To avoid potential hazards, use the product only as specified.

CAUTION: These statements identify conditions or practices that could result in damage to

the equipment or other property.

WARNING: These statements identify conditions or practices that could result in personal

injury or loss of life.

Specific precautions

Do not operate without covers. To avoid personal injury, do not apply any voltage or current to

the product without covers in place.

Electric overload. Never apply a voltage to a connector on the product that is outside the range

specified for that connector.

Avoid electric shock. To avoid injury or loss of life, do not connect or disconnect probes or test

leads while they are connected to a voltage source.

Do not operate in wet/damp conditions. To avoid electric shock, do not operate this product in

wet or damp conditions.

SPECIFICATIONS

All specifications are warranted unless noted typical and apply to the CM7.

Stated accuracies are at 23°C±5°C at than 80% relative humidity and without the battery

indicator displayed.

General specifications

Characteristics Description

Display count 3 3/4

Numeric update rate 1.5 times / sec

Polarity display Automatic

Overrange display “OL” is display

Low voltage indicator is indicated

Automatic power-off time Automatic backslit off = 30 minutes

Power source One 9V battery

Maximum input voltage 600V CAT Ⅳbetween V and COM

Maximum floating voltage 600V CAT Ⅳbetween any terminal and earth

V connector V, V, , 

Temperature Coefficient 0.2×(Spec. Accuracy) / °C, <18°C or >28°C

Battery Life 100 hours typical (Alkaline)

Measurement Characteristics

Accuracy is ±(% reading + number of digits) at 23°C ± 5°C, less than 80% R.H.

Temperature coefficient: 0.2 × (Specified accuracy) /°C, <18°C, >28°C

Operating temperature: 0°C ～30°C (≦80% RH)

30°C ～40°C (≦75% RH)

40°C ～50°C (≦45% RH)

(1) AC Volts: Auto-ranging

Range Resolution Accuracy Over voltage

protection

400.0V 100mV

750V 1V

±(1.0% reading + 5 digits) 50Hz ～500Hz 750V rms

Input Impedance：≧1M// less than 100pF.

AC Conversion Type: Reading less Full Scale 15% add 4 dgt.

AC Conversions are ac-coupled, true rms responding, calibrated to the rms

value of a sine wave input. Accuracies are given for sine wave at full scale and

non-sine wave below half scale. For non-sine wave add the following Crest

Factor corrections:

For Crest Factor of 1.4 to 2.0, add 1.0% to accuracy.

For Crest Factor of 2.0 to 2.5, add 2.5% to accuracy.

For Crest Factor of 2.5 to 3.0, add 4.0% to accuracy.

CF 2 @ 600V

1.5 @ 750V

(2) DC Volts: Auto-ranging

Range Resolution Accuracy Over voltage

protection

400.0V 100mV

1000V 1V ±(0.7% reading + 2 digits) 1000V rms

Input Impedance：≧1M

(3) Resistance Auto-ranging

Range Resolution Accuracy Over voltage

protection

400.0100m±(1.0% reading + 3 digits) 600V rms

Continuity: Built-in buzzer sound when resistance is less than 30approximately.

(4) Frequency: Hz

Range Resolution Accuracy Over voltage

protection

20Hz ～400Hz 1Hz ±(0.1% reading + 2 digits) AC/DC 1000A

for 1 min.

Min. Input Frequency：20Hz

Sensitivity: 3A rms for ACA (A～)(>400Hz Unspecified)

(5) ACA: Auto-ranging

Range Resolution Accuracy Frequency

Response

Overload

protection

0A ～200.0A 0.1A ±(1.9% reading + 3 Amp)

200.0A ～400.0A 0.1A ±(1.9% reading + 2 Amp) 50Hz ～400Hz

400A ～1000A 1A ±(2.9% reading + 5 Amp) 50Hz ～200Hz

1000A rms

Operating Temperature: 0℃to 30℃(≦80%RH), 30℃to 50℃(≦75%RH)

AC Conversion Type: Reading less Full Scale 15% add 4 dgt.

AC Conversions are ac-coupled, true rms responding, calibrated to the rms

value of a sine wave input. Accuracies are given for sine wave at full scale and

non-sine wave below half scale. For non-sine wave add the following Crest

Factor corrections:

For Crest Factor of 1.4 to 2.0, add 1.0% to accuracy.

For Crest Factor of 2.0 to 2.5, add 2.5% to accuracy.

For Crest Factor of 2.5 to 3.0, add 4.0% to accuracy.

CF 2 @ 600V

1.5 @ 750V

(6) DCA:

Range Resolution Accuracy Over voltage

protection

0A ～200.0A ±(2.9% reading + 3 Amp)

200A ～400.0A 0.1A ±(1.9% reading + 2 Amp)

400A ～1000A 1A ±(2.9% reading + 5 Amp)

AC 1000A

for 1 min.

Additional error according to remanence: 1% max. of current crest.

(7) Auto Power Off (APO)

The meter will automatically shut itself off after approximately 30 minutes after power on.

(8) Peak Hold: ±(3% reading +20 digits)

* >750V Unspecified.

* >800A Unspecified.

(9) Min/Max Hold: Add ± 15 dgt to accuracy for ACA.

Add ± 15 dgt and add remanence to accuracy for DCA.

*Automatically switch to the low resolution range at Peak Hold and Min/Max Hold.

Physical and Environmental Characteristics

Characteristics Description

Dimensions (H×W×D) 51mm×90mm×275mm

Weight (with battery) 420g

Environmental characteristics Description

Temperature operating 0 to +50°C

Non-Operating -20 to +60°C

Humidity (operating) <80% R.H.

Altitude Operating 2,000M (6560 ft.)

Non-Operating 12,300M (40354 ft.)

Vibration & shock Operating

MIL-T-28800E TYPE II Class 5

3gRMS, 5 to 55 Hz, 3axes

(10 minutes each)

Indoor Use Indoor Use

Certifications and compliances

Safety IEC 61010-1 600V CAT Ⅳ

Input rating V / : Category Ⅳ600 Volts

CAT Ⅳ: Equipment of OVERVOLTAGE CATRGORY Ⅳis for

use at the origin of the installations. Note examples

include electricity meters and primary over-current

protection equipment.

CAT Ⅲ: Distribution level mains, fixed installation.

CAT Ⅱ: Local level mains, appliances, portable equipment

Over voltage category

CAT Ⅰ: Signal level, special equipment or parts of equipment,

telecommunication, electronics.

Pollution Degree 2 Do not operate in environments where conductive

Pollutants may be present.

EC Declaration

of Conformity

Meets the intent of Directive 89/336/EEC for Electromagnetic

Compatibility and Low Voltage Directive 73/23/EEC for specifica -

tions as listed in the official Journal of the European Communites:

En 55011 Class A: Radiated and Conducted

Emissions.

En 50082-1 Immunity: IEC 801-2 Electrostatic Discharge

IEC 801-3 RF Radiated

En 61010-1 Safety requirements for electrical equipment for

measurement, control, and laboratory use.

Required Equipment

Required equipment is listed in Table B. If the recommended models are not available, equipment

with equivalent specifications may be used.

Repairs or servicing should be performed only by qualified personnel.

Table B. Required Equipment

Equipment Required Characteristics Recommended Model

Calibrator AC Voltage Range: 0 ～750V AC

Accuracy: ±0.07% (Basic)

Frequency Range: 40 ～1KHz

Accuracy: ±2%

DC Voltage Range: 0 ～1000V DC

Accuracy: ±0.006% (Basic)

Current Range: 0 ～10A

Accuracy: AC (40Hz to 1KHz): ±0.08% (Basic)

DC: ±0.02% (Basic)

Frequency Source: 5.00Hz ～100MHz

Accuracy: ±0.001%

Amplitude: 0.5V p-p ～1.0V p-p (square wave)

Accuracy: ±5%

Resistance Range: 1～100M

Accuracy: ±0.03% (Basic)

Fluke 5500 or Wavetek

9100 Calibrator or

equipment

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