METREL Eurotest 61557 User manual

Eurotest 61557

MI 2086

User Manual

Version 4.2, Code no. 20 750 719

MI 2086 Eurotest Measurement instructions

3.5. Earth Resistance (internal generator)

The Eurotest 61557 test instrument is able to carry out Earth Resistance

measurement using tree different methods. The appropriate one is to be selected by

the operator on basis of concrete earthing system to be tested.

For additional general information concerning Earth Resistance measurement, refer to

enclosed handbook Measurements on electric installations in practice and

theory.

How to carry out Earth Resistance measurement using

standard four-lead test method?

Step 1

♦Set function switch to ρREposition, “Earth Resistance” or “Earth Resistivity”

menu will be displayed.

♦Select Earth Resistance function (standard four-lead method) by using the

FUNC (F1) key. Earth Resistance function (standard four-lead method) is

selected, when R EARTH is displayed; see the figure below.

Fig. 23. Earth Resistance initial menu

Step 2

♦Set High limit Earth Resistance value. Later will test results be compared with

the set limit value and, if higher, they will be equipped with “!”mark and Result

over limit message.

How to set the high limit value?

♦Press the Hlim (F2) key, to enter “Limit value adjustment mode”, the following

menu will be displayed:

Rc... Resistance of current probe.

Rp... Resistance of potential probe.

MI 2086 Eurotest Measurement instructions

Fig. 24. Limit adjustment menu and table of presettable limit values

♦Value between 1 Ωand 5000 Ω, according to the table above may be selected

by using the ↑(F2) and ↓(F3) keys. If test result is not to be compared with set

limit value at all, then press the Off (F4) key. Set limit value (displayed on top

display line) will be substituted with ∗Ω mark. The Off key will alter to On,

enabling the operator to turn the limit value ON again and vice versa.

♦Press the Back (F1) key after setting limit value, to return to “Earth Resistance

initial menu” (see the figure 19.).

Step 3

♦Connect test leads to the instrument and to tested object according to the

figures below (press the HELP key for basic connection information).

Fig. 25. Connection of optional Earth Test Set – 20 m (Order No. S 2001)

Range / discrete

value (Ω) Step (Ω)

1 – 100 1

166, 250, 500,

833, 1666,

2500, 5000

⁄

MPEC

Rc Rp R

Option S 2001

>5d

lue

black

reen

MI 2086 Eurotest Measurement instructions

Fig. 26. Connection of optional Earth Test Set – 50 m (Order No. S 2002)

Step 4

♦Press the START key and keep it pressed, until result is stabilised, then release

the key. Test result is displayed; see an example of the result on figure below.

Rp k

64.8

1.52

2.63

Fig. 27. Example of Earth Resistance test result

♦Store displayed result for documentation purpose; see instructions how to store it

in chapter 4.3. Storing test results.

Notes!

♦In case of present external voltage higher than 20 V a.c./d.c. between H and E

or ES and S test terminals, the Earth Resistance measurement will not be

carried out after pressing START key, but the voltage will be displayed,

equipped with “!” mark and Input voltage > 20 V message! Beep warning sound

will be affected too!

♦If resistance of current or potential probe is too high (>(4 k Ω+ 100 RE) or >50

kΩ, whichever is lower), test result will be equipped with “!” mark and

Pote. spike Rp > xxx Ω/ Curr. spike Rc > xxx Ωmessage. The value xxx is

currently calculated (for each displayed result) on basis of displayed result!

♦If test result is out of measurement range (open test leads), >20 k Ωmessage

will be displayed!

Both resistances, Rc and Rp are

measured and displayed

continuously.

lue

black

green

MPEC

>5d

Option S 2002

RpRc

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