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MULTI MEASURING INSTRUMENTS MET-1 Instruction Manual

Clamp earth tester
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Clamp Earth Tester
Instruction Manual
Thank you very much for selecting our clamp earth tester.
This model is complex instrument and employs a very reliable
mechanical/electronic design.
instrument, read this instruction manual completely and
familiarize yourself thoroughly with all functions. With proper
use and care, your tester will give you years of satisfactory
service.
Multi Measuring Instruments Co., Ltd.
Akihabara murai-Bldg. 7F,
1-26 Kanda Sakuma-cho,
Chiyoda-ku, Tokyo, 101-0025 Japan
Tel: 81-3-3251-7016
Fax: 81-3-3253-4278
MET-1
Before you use your new

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Summary of Contents for MULTI MEASURING INSTRUMENTS MET-1

  • Page 1 With proper use and care, your tester will give you years of satisfactory service. Multi Measuring Instruments Co., Ltd. Akihabara murai-Bldg. 7F, 1-26 Kanda Sakuma-cho, Chiyoda-ku, Tokyo, 101-0025 Japan...

  • Page 2: Table Of Contents

    CONTENTS 1. General…………………………………………………………………………..1 2. Safety summary………………………………………………………………... 2-3 3. Measuring principle of clamp earth tester………………………………………4-5 4. Specification……………………………………………………………………..6-7 5. Panel description…………………………………………………….…………..8-9 6. Preparation before use…………………………………………………………...10 6-1. Battery charging……………………………………………………………..10 6-2. Rechargeable battery……………………………………………………….10 Precaution on charging battery……………………………………………..10-11 7. Operation…………………………………………………………………………12 7-1. AC current measurements………………………………………………….12 7-2. Earth resistance measurements………………………………………..13-14 7-3.

  • Page 3: General

    1. General The periodic measurement of earth electrode resistance is indispensable to ensure the safety for electrical installation. The ordinary earth electrode test method requires the use of auxiliary test spikes or rods for the measurements. New clamp earth tester provides simple and quick measurements for earth electrode resistance without lazy spiking work.

  • Page 4: Safety Summary

    2. Safety summary This instrument has been manufactured and tested in accordance with safety regulations IEC 61010-1/EN 61010-1 and IEC 61010-2-032/EN 61010-2-032. If used for its intended purpose, safety of the user and of the instrument is assured. The device may only be operated by properly trained personnel who are capable of recognizing the dangers associated with the measurement of electrical current and voltage.
  • Page 5 CAUTION ●Do not use or storage the instrument under the direct sunshine, high humidity and temperature, as it may cause the insulation defect of the instrument. ●Do not use the instrument nearby the appliance or machine which generate the strong magnetic field, as it may cause the measuring error of instrument. ●Do not apply the mechanical vibration or shock to the instrument.

  • Page 6: Measuring Principle Of Clamp Earth Tester

    3. Measuring principle of clamp earth tester Block diagram - 4 -...
  • Page 7 Equivalent circuit The block diagram and equivalent circuit show the measuring principle of CLAMP EARTH TESTER. When the auto sweep signal (4kHz to 200kHz, 160mV p-p) is injected into the circuit, the resonance phenomenon is caused at the certain frequency by inductance (L) and electrostatic capacity (C ) or DC resistance (r) and electrostatic capacity (C...

  • Page 8: Specification

    4. Specification Measuring function : Earth resistance, AC current (Load & leakage) A/D conversion : Dual slope integration mode Safety standard : IEC 61010-1,IEC61010-2-032 Installation CATⅡ600V or CATⅢ300V Sampling : Approx. 2 times/second for AC current Measuring time : Approx. 30 second for earth resistance Display : LCD16 letters/characters x 2 line with contrast adjuster...
  • Page 9 AC current Range Resolution Accuracy Maximum imput 200mA 0.1mA 2% rdg ± 8dgt 20A rms 2000mA 2% rdg ± 8dgt 0.01A 2% rdg ± 8dgt : φ34mm with 2.5m lead Measuring CT : φ34mm with 2.5m lead, Injection CT Auto sweep signal : 4kHz～400kHz Signal injection level : Approx.

  • Page 10: Panel Description

    5. Panel description ①Power switch : Power ON/OFF switch. After the final key (POWER) operation, the power will be turned off automatically 5 minutes later. ②Terminal for Injection CT : The insertion terminal for the injection CT. (INJECTION) Connect red plug to the red terminal and black plug to the black terminal.
  • Page 11 ④Injection Terminal : for the signal injection not from the CT but from (OUT PUT) the instrument body to disconnected terminals of grounding line. ⑤Menu switch : Press this switch to return to the default display. (MENU) ⑥Enter switch : Enter switch for the measuring function (earth resistance or current) selected by “UP”...

  • Page 12: Preparation Before Use

    6. Preparation before use 6-1. Battery charging ①Connect the charger plug to the jack (CHARGER) of the instrument. ② Connect the charger to AC outlet making sure that main voltage is compatible (AC 200V～240V). The charger lamp is turned ON and the battery charging will start immediately.
  • Page 13 ●When the instrument is unused for a long period of time, the battery power will be consumed by the self discharging. ●Avoid over charging, it may damage the battery life. ●Before using the instrument, charge the battery sufficiently. ●When instrument operation time is significantly reduced even after full charging, replace the battery to new one, as the battery power is exhausted.

  • Page 14: Operation

    7. Operation 7-1. AC current measurements ① Press “POWER” switch, the power is turned ON. ②Press “DOWN” key switch and move the cursor to “Current” position and press “ENT” key. The tester is set to AC current measurement mode as the drawing.

  • Page 15: Earth Resistance Measurements

    Note: Press “MENU” switch to the return to the initial display. CAUTION ●The input frequency is limited to 100Hz for AC current measurements. ●The frequency value is not displayed for less than 3mA input. WARNING POSSIBLE ELECTRICAL SHOCK OR FIRE HAZARD: ●The applicable circuit voltage is limited to AC 500V rms.
  • Page 16 ④Set the cursor to “Current” position and press “ENT” switch. The tester is set to AC current measurement mode. Check the current value of grounding circuit. If the measured current value is more than 2A, the earth resistance is not measurable. ⑤Press “MENU”...

  • Page 17: Measurement By Terminals Out Mode

    7-3. Measurement by TERMINALS Out mode This TERMIANL Out mode means the measurement for earth resistance by using output from the terminal of instrument body. ① Make power off of the circuit and disconnect the terminal of grounding line. ② Connect the lead wires as above drawing. ③...

  • Page 18: Measuring Example

    8. Measuring example The various measuring examples are showed in this chapter, however, these are potential sources of error or incorrect test results due to the difference of the earthing system and configuration in the field. It is important to remember the key rules for the correct measurements.
  • Page 19 ●The clamping point (A) is used for the earth resistance measurement of the metal case of high voltage appliance. Connect the earth (A) to the known good earth by the subsidiary lead wire to create the loop circuit. ●The clamping point (B) is used for the PEN earth resistance measurement. In this case, simply clamp the measuring point by the injection CT and the measuring CT.

  • Page 20: Earth Resistance Measurements For The Outdoor Appliance

    8-2. Earth resistance measurements for the outdoor appliance (Air conditioner, etc.) Measure the earth resistance at the measuring point (ED) without the connection of the subsidiary lead wire at first. If the measured value is ex- tremely high or “OVER” is displayed, use the subsidiary lead wire to create the loop circuit.

  • Page 21: Earth Resistance Measurements For The Earthing Electrode

    Equivalent circuit Test result = RE+(R // - - -) // - - -) ＜ RE Resistance of parallel connection (R Test result ≒ RE The greater the number of parallel paths, the closer the measured value will be to the actual earth resistance. 8-4.

  • Page 22: Earth Resistance Measurements For Telecommunication System

    8-5. Earth resistance measurements for telecommunication system 8-6. Measurements for the earting connection of the outlet MET-CH outlet checker (optional accessory) is used to check for mis-wiring of the earthing connection of the outlet. Connector with earthing plug - 20 -...

  • Page 23: Measurement For The Active Line

    8-7. Measurements for the active line The earth resistance can be measured by clamping 2 CTs near at transformer (point A or B) and near at the electrical loading part (motor, electric appliance, etc. (point C. D. or E.). 8-8. Measurements where L (inductance) & C (capacitance) are low Where L &...

  • Page 24: Maintenance

    9. Maintenance When making requests for repair service, please bring the instrument directly to the dealer. If this is impossible, however, send the instrument directly to our sales office. When mailing this instrument, always pack it in its original or equivalent packing material and pack together with name, address, telephone number and the warranty documentation.

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