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
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.
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.
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.
3 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 400.0V 100mV 750V 1V Accuracy Over voltage protection ±(1.0% reading + 5 digits) 50Hz ～ 500Hz 750V rms Input Impedance：≧1MΩ// less than 100pF.
(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 0A ～ 200.0A 0.1A ±(1.9% reading + 3 Amp) 200.0A ～ 400.0A 0.1A ±(1.9% reading + 2 Amp) 400A ～ 1000A 1A ±(2.
(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.
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 Calibrator Required Characteristics 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.
Basic Maintenance Warning To avoid shock, remove the test leads and any input signals before opening the case or replacing the battery. Opening the Meter Case Caution To avoid unintentional shock circuit, always place the uncovered Meter assembly on a protective surface. When the case of the Meter is open, circuit connections are exposed. To open the Meter case, and do the following: 1. Disconnect test leads from any live source, push the bottom the rotary to OFF. 2.
Performance Tests The following performance tests verify the complete operability of the Meter and check the accuracy of each Meter function against the Meter’s specifications. Accuracy specifications are valid for a period of one year after calibration, when measured at an operating temperature of 18°C to 28°C and a maximum of 80% relative humidity.
6. Turn the rotary switch to “V ” position. 7. Set the calibration for the voltage from step 1 to 4 in Table 2. 8. Compare the reading on the Meter display with the display reading shown in Table 2. 9. If the display reading falls outside of the range shown in Table 2, the meter does not meet specification. Table 2 DC Voltage Test: Step Input Reading 1 390.0V 387.1 to 392.9 2 -390.0V -387.1 to –392.
Testing the AC Current Function To verify the accuracy of AC current measurement functions, do the following: 1. Using jaw of the meter around the suitable wire or conductor. 2. Turn the rotary switch to A. 3. Apply the inputs for steps 1-2 in Table 4. 4. For each input, compare the readings on the Meter display to the reading in Table 4. 5. If the display reading falls outside of the range shown in the Table 4, the meter does meet specification.
Testing the Hz Function To verify the accuracy of Hz current measurement functions, do the following: 1. Using jaw of the meter around the suitable wire or conductor. 2. Turn the rotary switch to Hz. 3. Apply the inputs for steps 1-2 in Table 6. 4. For each input, compare the readings on the Meter display to the reading in Table 6. 5. If the display reading falls outside of the range shown in the Table 6, the meter does meet specification. Table 6 Hz Current Test: Step Source Reading 1 0.020KHz 0.
Calibration Procedure Recalibrate your meter: It is recommended that the meter may be calibrated once year. Use the following procedure to calibrate the clamp meter. 1. Perform calibration at an ambient temperature and a relative humidity (23ºC±2ºC and RH≦ 80% ). Allow instrument to sit at this temperature for at least thirty minutes. 2. Disconnect the test leads and turn the meter off. Remove the test leads from the front terminals. 3. Position the meter face down.
(E) AC 400A Range Calibration (Adjust VR104) 1. Set the clamp meter at ACA function. 2. Flow the current of AC 360A±0.02%/50Hz around the suitable wire or conductor. 3. Position clamp around wire or conductor and release trigger to make sure the clamp is entirely closed. 4. Reposition the clamp to make the wire or conductor is in the center of the clamp. 5. Using a small flat-tipped screwdriver adjust the potentiometer VR104 until the display reads 367.0 or 367.2. 6.
