HT FULLTEST3, Руководство пользователя, Страница: 60 / 100

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: