MI 2087 AL2 EasiTEST
Measurement instructions
18
3.3 RCD - Contact voltage and fault loop resistance
For general information concerning Contact voltage / Fault loop resistance
measurement refer to enclosed handbook
Measurements on electric installations
in theory and practice
.
How to carry out the measurement
Step 1
q
Connect test cable
(Universal test cable) to EasiTest.
q
Set function switch to
TRIP-LOCK
position,
Contact voltage initial menu
or
Fault loop resistance initial menu
will be displayed; see the figure below.
Uc
or
looP
is displayed for a while before initial menu appears.
Fig. 11:
Contact voltage initial menu (left) and Fault loop resistance initial menu
Step 2
q
Select required function i.e. Contact voltage or Fault loop resistance by
pressing the
SELECT
key first. Previously set function (
Uc
or
looP
message)
starts to flash. Select the function by using the
▲
and
▼
keys.
Fault loop resistance function takes longer measurement time but offers better
resistance accuracy (in comparison with the R
L
subresult in Uc function).
Step 3
Select
nominal differential current I
∆
N
as follows:
q
Press the
SELECT
key, last set nominal differential current starts to blink.
q
Select appropriate value by using the
▲
and
▼
keys. The following values are
available: 10mA, 30mA, 100mA, 300mA, 500mA or 1000mA.
G
(
G
eneral)
type of RCD
is selected.
S
(
S
elective)
type of RCD
is selected.
