07/ 2018
BENNING ST 710
16
- If R
PE
is lower than the admissible limiting value, the measured value of R
PE
is shown and
a
appears next to the R
PE
symbol. Now, the R
PE
measurement is carried out again with
reversed polarity. After the R
PE
test has been passed, the test of the insulating resistance is
started.
- If "Lo LOAD" is shown on the display, please check whether the test object is switched on.
- Press the key
2
to continue the testing procedure in case of the load being too low (R
L-N
< 100 kΩ).
- If the insulating resistance R
ISO
is higher than the admissible limiting value, a
appears
next to the R
ISO
symbol.
- Similarly, a
is shown next to the I
EA
symbol, if the protective conductor current I
EA
is lower
than the admissible limiting value.
- The test is considered to be passed, if "PASS" is shown on the display.
See figure 3:
Testing of devices of protection class I (devices with protective conductor and
accessible conductive parts which are connected to the protective conductor)
Note on measuring the protective conductor resistance:
-
Alternatively, the measurement of the protective conductor resistance R
PE
can be car-
ried out as permanent measurement (max. 3 minutes). For this purpose press the key
2
for approx. > 5 sec. until the
symbol appears on the display. Check the connecting
line of the test object by bending it over the entire length in order to detect weak points
or a break of the protective conductor. The BENNING ST 710 continuously records the
current measured value on the display and stores the maximum value in the memory. By
pressing the key
2
again, the measurement is carried out with reversed polarity. Press
the key again to indicate the maximum value of R
PE
on the display and to continue the
testing procedure as described in section 8.2.1.
