HT instruments SPEED418 - Manual (Page 15)

400 Series
EN - 14
CAUTION
If message “Measuring…” appears on the display, the instrument is
performing measurement. During this whole stage, do not disconnect the
test leads of the instrument from the mains.
5. Once the test is completed, if
all measured values are
correct, the instrument gives
a double acoustic signal and
displays the message “OK”,
which signals that the test
has been completed
successfully, and a screen
similar to the one reported
here to the side
A U T O
R a = 4 9 . 1

T r c d = 2 4 m s
R P - P e > 9 9 9 M

Value of earth resistance
Value of the RCD’s tripping time
Value of the phase-to-earth
insulation resistance
OK
30mA 50V 500V
IdN RCD UL VNom
6.
The results displayed can be saved by pressing the SAVE key twice or the
SAVE
key and, subsequently, the ENTER key (§ 9.1)
6.1.1. Description of anomalous results
1. The instrument detects a
resistance higher than the
calculated limit value UL/IdN
(1666Ω @ UL=50V and
IdN=30mA) or higher than
the full scale value. A screen
similar to the one reported
here to the side is displayed,
a long acoustic signal is
given and the automatic test
is interrupted
A U T O
R a = 1 7 8 9

T r c d = - - - - m s
R P - P e = - - - - M

Value of earth resistance
NOT OK
30mA 50V 500V
IdN RCD UL VNom
2. The instrument detects that
the RCD trips out of its limit
time, or does not trip at all. A
screen similar to the one
reported here to the side is
displayed, a long acoustic
signal is given and the
automatic test is interrupted
A U T O
R a = 1 7 8 9

T r c d > 9 9 9 m s
R P - P e = - - - - M

Value of earth resistance
Value of the RCD’s tripping time
NOT OK
30mA 50V 500V
IdN RCD UL VNom
3. If the measured phase-to-
earth insulation value is
lower than the set limit, the
instrument displays a screen
similar to the one reported
here to the side and gives a
long acoustic signal
A U T O
R a = 1 7 8 9

T r c d > 9 9 9 m s
R P - P e = 0 . 0 1 M

Value of earth resistance
Value of the RCD’s tripping time
Value of the phase-to-earth
insulation resistance
NOT OK
30mA 50V 500V
IdN RCD UL VNom