HT instruments SPEED418 - Manual (Page 45)

400 Series
EN - 44
1. Press the MENU key, move the cursor to Ra in
the main menu by means of the arrow keys
(,) and confirm with ENTER. Subsequently
the instrument displays a screen similar to the
one reported here to the side. R a
-----

- - - - A
FRQ=50.0Hz
VP-N=228V
VP-Pe=228V
50V
UL
2.
Use the arrow keys ,  to set the limit value of contact voltage for the
system being tested, which may be: 50V, 25V.
It is not necessary to confirm the selection with ENTER
.
3. If possible, disconnect all loads connected downstream of the measured point, as the
impedance of these users could distort the test results.
4. Insert the green, blue and black connectors of the three-pin shuko cable into the
corresponding input leads E, N and P of the instrument. As an alternative, use the
single cables and apply the relevant alligator clips to the free ends of the cables. It is
also possible to use the remote probe by inserting its multipolar connector into the
input lead P. Connect the shuko plug, the alligator clips or the remote probe to the
electrical mains according to Fig. 20, Fig. 21, Fig. 22 and Fig. 23.
5.
Press the GO/STOP key on the instrument or the START key on remote
probe. The instrument will start the measurement.
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.
6. Once test is completed, if the
measured impedance value
is lower than the full scale,
the instrument gives a
double acoustic signal and
then displays a screen
similar to the one reported
here to the side
R a
1.07

2 1 5 A
FRQ=50.0Hz
VP-N=228V
VP-Pe=228V
Measured impedance value
Prospective fault current
P-N and P-PE measured voltages
50V
UL