KYORITSU 6050 - Manual (Page 26)

̶ 24 ̶
For the RCD range of Model 6050, distortion factor of test current
is improved compared with our traditional instruments. Therefore,
at operating time measurement of RCD, operating time of some
RCD and our traditional instruments may differ a little.
7. Uc TESTS
● The earth electrode resistance of a measuring circuit with a probe
shall not exceed table1(page 12).
7.1 Principles of Measurement
In fig.16, when grounding is incomplete and R exists, voltage occurs to
R if fault current flows in R. Person may touch this voltage, and the
voltage occurs to a person at this bout is called as Uc. At Uc test, the
value, when Uc reaches maximum, is calculated.
7.2 Uc Testing
7.2.1 Preparation
(1) Turn Function switch and power on the instrument. Select Uc.
(2) Press the "I⊿n / LOOP / PSC" SELECT SWITCH to set the Rated
Tripping Current (I⊿n) to the rated trip current of the RCD. Every
time "I⊿n / LOOP / PSC" SELECT SWITCH is pressed, ▼mark on
LCD shifts. Select I⊿n with above switch.
7.2.2 Wiring Check
(1) Insert the Test Lead into the instrument.(Fig.15)
(2) Connect test lead to object to be tested.(Fig.16,17)
(3) Make sure that the P-E and P-N wiring Check LEDs are lit and the
wiring in correct LED is not lit. If it is not correct, disconnect the
tester and check the wiring for a possible fault.
I⊿n 30mA
The Initial value