Bedienungsanleitung Benning ST 725 (Seite 39 von 71) (Deutsch, Englisch, Französisch)

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01/ 2015

BENNING ST 725



measurement and requests the user to switch the mains voltage of 230 V to the test socket

by showing a flashing "I

LEAK

" symbol. Make sure that the test sample is protected and

press the -key

to measure the protective conductor current by means of the differential

current measurement method.

- The protective conductor current measurement (differential current measurement method)

only starts as soon as the mains voltage is correct applied.

step 1 of 2:

- After a measuring time of 5 seconds or by pressing the key

, mains polarity will be

reversed and the protective conductor current will be measured with reversed mains voltage

("L/N" - "N/L"). The highest measured value of both measurements will be displayed. (step 2

of 2)

step 2 of 2:

- If the protective conductor current is lower than the admissible limiting value, a will be

shown next to the I

LEAK

symbol.

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

As an alternative:

BENNING ST 725 in battery operating mode (without mains supply):

- Similarly, a will be shown next to the I

symbol, if the protective conductor current I

(al-

ternative leakage current measurement method) is lower than the admissible limiting value.

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

Seegure4: 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 carried out

as permanent measurement (max. 2 x 90 seconds). For this purpose press the key

for

approx. > 5 seconds 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 725 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 9.1.

Note on measuring the protective conductor current in mains operating mode:

- Alternatively, the measurement of the protective conductor current I

LEAK

can be carried

out as permanent measurement (max. 2 x 5 minutes). Press the key

for approx. > 5

seconds to start permanent measurement. After 5 minutes, the polarity of the mains voltage

will be reversed automatically ("L/N" - "N/L"). By pressing the key

earlier, the mains

voltage polarity reversal can be activated manually and by pressing the key

again, the

measurement can be stopped.

Please observe that the BENNING ST 725 is not designed for carrying out repeated

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