Manual Benning ST 710 (page 21 of 74) (English, German, Dutch, French, Polish, Swedish)

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02/ 2011

BENNING ST 710



- If R

is lower than the admissible limiting value, the measured value of R

is shown and

a appears next to the R

symbol. Now, the R

measurement is carried out again with

reversed polarity. After the R

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

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

symbol, if the protective conductor current I

is lower

than the admissible limiting value.

- The test is considered to be passed, if "PASS" is shown on the display.

Seegure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

can be car-

ried out as permanent measurement (max. 3 minutes). For this purpose press the key

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

again, the measurement is carried out with reversed polarity. Press

the key again to indicate the maximum value of R

on the display and to continue the

testing procedure as described in section 8.2.1.

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Benning ST 710 Manual

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