![background image](http://html1.mh-extra.com/html/ht/fulltest3/fulltest3_user-manual_2178151060.webp)
FULLTEST3
EN - 58
6.7. GLOBAL EARTH RESISTANCE/CONTACT VOLTAGE (R
A
)
The instrument allows the measurement of the global earth resistance (a
measurement typically used in TT type electrical systems - civil installations as an
alternative to the earth measurement with the voltamperometric method) by applying
a test current of I
'
N / 2 in which I
'
N = rated tripping current of the differential (RCD)
and therefore, in the absence of ground leakage, without causing the intervention of
the RCD.
1. Press the
FUNC
key and select the
R
A
function. The following screen is shown
on the display
Fig. 51 : RA initial screen
2. Select the test parameters on the instrument (see Table 9) and carry out the
desired setup
Parameter Description
Value
I
'
N
Nominal trip out current of RCD 10,30,100,300,500,650,1000mA
Table 9 : Setup parameters of RA
function
6.7.1. Limit value setting
In accordance with safety guidelines the global earth resistance R
A
must be less than
or equal to the
U
CLIM
/I
'
N
ratio where the limit contact voltage U
CLIM
can be set to
25V or 50V. Example: U
CLIM
selected = 50V, I
'
N = 30mA
Æ
R
ALIM
= 1667
How to select limit contact voltage U
C LIM
.
(see § 5.5).
Press the
MENU
o
SETUP
o
CONTACT VOL.
touch-screen keys and select 25V or 50V.
3. Check selected nominal differential current and modify it if needed by pressing
the
I
'
N
touch-screen key first.
4. Select measurement screen by pressing the
touch-screen key and check all
settings again
5. Connect the test leads or the Shuko cable according to one of below figures:
Summary of Contents for FULLTEST3
Page 1: ... Copyright HT ITALIA 2020 Release EN 2 01 13 01 2020 FULLTEST3 User manual ...
Page 2: ......
Page 99: ......