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MI 2126 Earth 2/3                                                                        

Technical specification 

 

18 

5  Technical specification 

 
 

5.1  Functions 

 
Earth

 

resistance, two-wire method, three-wire method 

 

Measuring range according to EN61557-5 is: 1.77 

 

÷

 19.99 k

Display range (

Resolution (

Accuracy 

0.00 

÷

 19.99 

0.01 

20.0 

÷

 199.9 

0.1 

200 

÷

 999 

1.000 k 

÷

 1.999 k 

 

±

(2 % of r 10 digits) 

2.00 k 

÷

 19.99 k 

10 

±

(5 % of reading) 

 

 
Auxiliary earth electrode resistance R

C

 

100

×

R

E

 or 50 k

 (whichever is 

lower), indicator only 

Probe resistance R

P

 

100

×

R

E

 or 50 k

 (whichever is 

lower), indicator only 

Additional probe resistance error 
at R

Cmax

 or R

Pmax. 

  

±

(10 % of m. r.* + 3 digits) 

Additional error at 3 V voltage noise (50 Hz / 60 Hz) 

±

(5 % of r 10 digits) 

Automatic noise voltage indication threshold 

  

3 V (<50 

, worst case) 

Open-terminal test voltage 

  

< 40 Va.c. 

Test voltage shape 

  

sine wave 

Test voltage frequency 

  

125 Hz / 150 Hz 

Short-circuit test current 

  

< 20 mA 

Automatic test of curr. and pot. test probe resistance    

yes 

Automatic test of voltage noise 

  

yes 

 
Accuracies  apply  for  1  year  in  reference  conditions.  The  error  in  operating  conditions 
could be at most the error for reference conditions (specified above) +1 % of r 
2 digits. 
 
*m.r. measuring range 

Summary of Contents for Earth 2/3

Page 1: ...Earth 2 3 MI 2126 Instruction Manual Version 1 0 Code No 20 750 190...

Page 2: ...el metrel si Mark on your equipment certifies that this equipment meets the requirements of the EU European Union concerning safety and interference causing equipment regulations 2005 METREL No part o...

Page 3: ...ctor panel 7 2 4 Base 7 2 5 Instrument messages 8 3 Using instrument 9 3 1 Performing 3 wire measurement 9 3 2 Performing 2 wire measurement 11 3 3 General settings 14 4 Maintenance 16 4 1 Batteries 1...

Page 4: ...necessary for carrying out the tests 1 2 Warnings In order to ensure operator s safety while carrying out various measurements and tests using the Earth 2 3 as well as to keep the test equipment undam...

Page 5: ...ipment for measurement control and laboratory use EMC requirements Class B Hand held equipment used in controlled EM environments Safety LVD EN 61010 1 Safety requirements for electrical equipment for...

Page 6: ...which includes the operator s panel and connectors 2 2 Front panel The front panel consists of a custom LCD and a keyboard see the figure below 1 Earth 2 3 MI 2126 TEST DISP 2 3 4 Figure 1 LCD display...

Page 7: ...r panel Use original test accessories only Never connect instrument to high voltage H S E 1 2 3 Figure 2 Connector panel Legend 1 Blue test terminal H 2 Red test terminal S 3 Black test terminal E 2 4...

Page 8: ...ges Unit Figure 4 Display segments Description of possible display messages o r Result out of range and 20 V External voltage is higher than approx 20 Veff and RC Current spike resistance is too high...

Page 9: ...be blue H is at least 5 times the length of earthing electrode rod or the length of the band electrode see Figure 5 If measuring the total earth resistance of a complex earthing system the required di...

Page 10: ...s REarthtot RE1 RE2 RE3 RE4 R E1 E4 Separate earthing resistances R P Potential spike resistance R C Current spike resistance R Earthtot Total earth resistance of tested earthing system Step 2 Press t...

Page 11: ...displayed instead marked with symbol If a noise voltage higher than approx 3 V is present between blue H and black E or red S test terminals symbols and will be displayed indicating that the test res...

Page 12: ...MI 2126 Earth 2 3 Using instrument 12 Figure 8 Two wire test method dependent objects Figure 9 Two wire test method independent objects...

Page 13: ...leads are not connected to the phase line REarthtot RA RO RX R x Earth resistance R A Resistance of protective conductor R O Resistance of earthing electrode R Earthtot Total earth resistance of teste...

Page 14: ...hat the test result may not be correct The instrument does not indicate if a DC voltage is present at the input terminals DC voltage have no influence on the measurement If the resistance of the curre...

Page 15: ...cting algorithm DISP Select measurement algorithm TEST Confirmation of measuring algorithm The instrument is ready for measurements Notes In general it is recommended to use normal measuring algorithm...

Page 16: ...ts may be incorrect The instrument is switched off automatically when battery voltage drops bellow the limit BAT is displayed for a few seconds before switching off Nominal power supply voltage is 6 V...

Page 17: ...re 14 for fuse location Warning Turn power off and disconnect any measurement accessory connected to the instrument before opening battery cover Replace blown fuse with original type only M0 8A otherw...

Page 18: ...hichever is lower indicator only Additional probe resistance error at RCmax or RPmax 10 of m r 3 digits Additional error at 3 V voltage noise 50 Hz 60 Hz 5 of reading 10 digits Automatic noise voltage...

Page 19: ...ximately 10 min without activity Visual warnings yes Dimensions w h d 280 x 70 x 80 mm Weight without accessories and batteries 410 g Display custom LCD Protection classification double insulation Deg...

Page 20: ...arth 2 3 Standard and optional accessories 20 6 Standard and optional accessories See attached sheet to compare received set of accessories with listed one The optional accessories may be supplied upo...

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