MI 2087 AL2 EasiTEST
Measurement instructions
22
Step 5
q
Connect test cable
to tested object (mains outlet or other test terminals),
according to the figure 12 (Universal test cable).
Step 6
q
Press the
START
key and release it. Measurement will be carried out and
result displayed afterwards (Trip-out time at set differential current).
q
Double click
START
key to change positive start polarity of test current to
negative one; see the figure below.
Fig. 14:
Positive and negative start polarity of test current
q
Check contact voltage at set nominal differential current (standard RCD type)
or at double nominal differential current (selective RCD type) and set limit
contact voltage by using the
DISPLAY
key.
Test of Selective RCD
For safety reason Contact voltage measurement is carried out (regardless of RCD
type) before Trip-out Time measurement is realised. As the Selective type of RCD
(delayed trip-out) operates on basis of integration of fault current it is necessary to
relax it before Trip-out Time measurement is carried out, otherwise the test is not
relevant. That is why waiting time of 30s is involved before Trip-out Time
measurement. The waiting time is presented on display as countdown from 30 to 0.
Notes:
q
If RCD trips during contact voltage measurement (some fault or leakage
current is probably already flowing to ground) “
rcd
”
mark will start to blink.
q
RCD type and nominal differential current set in this function will be offered in
other RCD functions (wherever actual)!
q
Limit contact voltage Ulim can be set in contact voltage function only!
q
For safety reason trip-out time measurement is carried out only if contact
voltage at nominal differential current is lower than set limit value!
q
Current flowing to PE protective conductor caused by faulty appliances or
capacitive connection between L and PE terminals will influence the test result.
Disconnect such appliances before measurement is started!
q
Specified accuracy of tested parameters is valid only if earthing system
connected to PE terminal is free of interfering voltages!
q
“
bat
” message displayed during or after finishing the measurement means
batteries are too weak to guarantee correct result. Replace the batteries.
