HT 400 Series User Manual

400 Series
EN - 32
6.4.5. RA mode
In RA mode, the contact voltage and the total earth resistance are measured by supplying
a leakage voltage equal to half the value of the set nominal current in order to prevent the
RCD from tripping.
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.
A
fter the test is completed, if
the measured resistance
value matches the nominal
current and the set limit
contact voltage, RA<Ul/IdN
(1666Ω @ UL=50V and
IdN=30mA), the instrument
gives a double acoustic
signal and displays the
message “OK”, which
RCD
39
FRQ=50.0Hz Ut=1.4V
VP-N=228V VP-Pe=228V
Value of total earth resistance
Detected value for contact voltage Ut
compared to the nominal value of
the set residual current
OK
RA 30mA 50V
Func IdN RCD UL
signals that the test has been completed successfully, and displays a screen similar to
the one reported here to the side
7.
The results displayed can be saved by pressing the SAVE key twice or the
SAVE key and, subsequently, the ENTER key (§ 8.1)
6.4.6. Description of anomalous results
1. By using the RA mode, if the
instrument detects a contact
voltage higher than the set
limit, it displays the message
reported here to the side.
Check the efficiency of the
protective conductor and the
earthing
RCD
39
FRQ=50.0Hz Ut=58.4V
VP-N=228V VP-Pe=228V
Dangerous contact voltage
NOT OK
RA 30mA 50V
Func IdN RCD UL
2. If the RCD trips in a time
exceeding the limits reported
in Table 5, the instrument
gives a long acoustic signal
which signals the negative
result of the test and then
displays a screen similar to
the one reported here to the
side. Check that the set type
of RCD matches the type of
RCD being tested
RCD
0°
487ms
FRQ=50.0Hz Ut=1.4V
VP-N=221V VP-Pe=221V
TIME NOT OK
The tripping time is not compliant
with Table 5
x1 30mA 50V
Func IdN RCD UL

HT 400 Series Specifications

General

Type	Digital Multimeter
Diode Test	Yes
Auto Ranging	Yes
Data Hold	Yes
Operating Temperature	0°C to 40°C
DC Current Range	400μA to 10A
AC Current Range	400μA to 10A
Resistance Range	400Ω to 40MΩ
Continuity Test	Yes
Display	LCD, 4000 counts
Measurement Range	As per individual functions