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MULTI MEASURING INSTRUMENTS MET-1, Instruction Manual

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Thank you very much for selecting our clamp earth tester. 
This model is complex instrument and employs a very reliable 
mechanical/electronic  design.    Before  you  use  your  new 
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 

Clamp Earth Tester 

MET-1 

Instruction Manual 

Summary of Contents for MET-1

Page 1: ...ument 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 In...

Page 2: ...ts 13 14 7 3 Measurement byTERMINALS Out mode 15 8 Measuring example 16 8 1 Electric installation 16 17 8 2 Earth resistance measurements for the outdoor appliance 18 8 3 Earth resistance measurements...

Page 3: ...e circuit and the other CT measures the injected current of the loop circuit In our clamp earth tester the auto sweep signal 4kHz to 400kHz 160mV p p is used and injected into the loop circuit When th...

Page 4: ...any part of the instrument Never make measurements for un insulated conductors or bus bars 2 Safety summary This instrument has been manufactured and tested in accordance with safety regulations IEC...

Page 5: ...To avoid electrical shock use CAUTION when working above 60V DC or 25VAC rms Such voltages pose a shock hazard Do not apply the voltage more than AC 10V to the input and output terminals Do not pull t...

Page 6: ...3 Measuring principle of clamp earth tester Block diagram 4...

Page 7: ...n is caused the current flow i become maximum The injected current i into the circuit is proportional to the earth resistance RB and this current i is measured by the measuring CT and used for the com...

Page 8: ...16 letters characters x 2 line with contrast adjuster Over range indication OVER on LCD Low battery indication B mark on LCD Data hold indication DH mark on LCD for AC current measurement Detection me...

Page 9: ...ce More than 100M between CT core and CT handle Power supply NiMH battery pack 1 2V x 5 Battery charger AC200V 240V 50 60Hz Auto power off function Approx 5 minutes later after power on Power consumpt...

Page 10: ...ally 5 minutes later Terminal 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 Terminal for measuring CT...

Page 11: ...lso used to start the earth resistance measurement Up down key switch Up and down key switch for the cursor of the UP DOWN display Data hold switch InAC current measurement press this switch DATAHOLD...

Page 12: ...echargeable battery NiMH battery is affected by various condition and instrument operation time may be affected by the charging discharging cycles and condition Precaution on charging of battery unuse...

Page 13: ...med 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...

Page 14: ...s displayed If you made measurements in a dark place or in a place where it is difficult to see the readings use DATA HOLD switch Note Clamp only one conductor of the circuit to be measured Measuremen...

Page 15: ...ng sure that the arrow marks of the CTs are same direction 13 CAUTION The input frequency is limited to 100Hz forAC current measurements The frequency value is not displayed for less than 3mAinput WAR...

Page 16: ...not caused In such case use a subsidiary jumper wire to create a good loop circuit Set the cursor to Current position and press ENT switch The tester is set to AC current measurement mode Check the cu...

Page 17: ...sign appears on the display and measurement starts After approx 30 seconds the measurement value is shown on the display To get back the initial display from the measuring condition press MENU switch...

Page 18: ...e of the earthing system and configuration in the field It is important to remember the key rules for the correct measurements There must be a loop resistance to measure The earth path must be in loop...

Page 19: ...he subsidiary lead wire to create a loop circuit as the drawing Equivalent circuit Earth resistance Earth resistance of the iron frame of the lighting rod of the building R2 R R1 R2 R1 R2 R R1 The ins...

Page 20: ...the measured value is ex tremely high or OVER is displayed use the subsidiary lead wire to create the loop circuit Connect the earth conductor to the earth terminal of the building by the subsidiary l...

Page 21: ...number of parallel paths the closer the measured value will be to the actual earth resistance 8 4 Earth resistance measurements for the earthing electrode RE1 to RE4 Individual earth resistances of t...

Page 22: ...s 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 outl...

Page 23: ...D or E 8 8 Measurements where L inductance C capacitance are low Where L C resonance has not been gotten this instrument may show OVER at the display In this case connect the objective grounding line...

Page 24: ...e information of the type of failure and cause If required always return accessories with the instrument When contacting us provide the model number and serial number of your instrument 10 Warranty Th...

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