Bedienungsanleitung Benning ST 725 (Seite 37 von 71) (Deutsch, Englisch, Französisch)

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01/ 2015

BENNING ST 725



LN 195 V - 253 V LN 195 V - 253 V

LE 195 V - 253 V or LE < 30 V

NE < 30 V NE 195 V - 253 V



Only the voltage potentials between the individual connections L, N and PE are

measured. The measurement does not provide any information on the proper

installation of the shock-proof socket. There will be no warning in case of a

dangerous contact voltage of the PE conductor!

The BENNING ST 725 must not be permanently connected to the mains voltage!

- After approx. 3 seconds, the BENNING ST 725 automatically switches to stand-by mode.

Seegure3: Voltagemeasurementonexternalshock-proofsocket

8.4 Testing procedure

The BENNING ST 725 is intended for electrical safety tests according to DIN VDE 0701-0702

and ÖVE/ ÖNORM E 8701. Please refer to the current version of the standards for detailed

information concerning the tests and limiting values.

Automatically,theBENNINGST725veriesthetypeoftheconnectedtestobjectandinforms

the user in case of incorrect preselection of the testing procedure [

...

Note:

- The BENNING ST 725 can be used for tests in battery operating mode and in mains

operating mode with connection of a mains voltage of 230 V. In battery operating mode, it

has to be observed that the protective conductor current and contact current measurement

is carried out by means of the alternative leakage current measurement method. This

method is appropriate for test objects which do not contain any mains voltage-dependent

switching elements (e.g. mains supply units).

- If the internal structure of the test object is not known or if it contains mains voltage-

dependent switching elements, the test has to be carried out in mains operating mode with

connection of a mains voltage of 230 V. As soon as the BENNING ST 725 is supplied with

mains voltage via the jack K, the protective conductor current/ contact current measurement

will be carried out automatically by means of the differential current/ direct measurement

method under operating conditions of the test object.

- The testing voltage for insulating resistance measurement is preset to 500 V

according

to the applicable standard. For test objects with integrated overvoltage arresters and for

electronic devices for which there are objections regarding a testing voltage of 500 V

, the

testing voltage can be reduced to 250 V

by means of the -key

9. Testing of electrical devices / equipment according to DIN VDE 0701-0702 and ÖVE/

ÖNORM E 8701



Prior to test, a visual inspection of the test object has to be carried out. In case

of possible damages, the test must be stopped.

9.1 Testing of devices of protection class I 

Testing of devices with protective conductor and accessible conductive parts which are con-

nected to the protective conductor.

- Connect the test object to the test socket

of the BENNING ST 725.

- Plug the 4 mm safety plug of the test lead with alligator clip into the 4 mm safety socket

and establish a connection with a metal part of the test object.

- For mains operating mode (protective conductor current by means of differential current

measurement method, test object in operation!): Connect the plug of the mains connection

cable with the socket K and the shock-proof plug with a protected shock-proof socket

(230 V, 50 Hz, 16 A).

- If necessary, the testing voltage of the R

ISO

(insulating resistance) measurement can be

reduced to 250 V

by means of the -key

. The selected testing voltage is briefly shown

on the display

. Press the key again to switch back to the preset testing voltage of 500 V

- Switch the test object on.

- Press the -key

to start the automatic testing procedure.

- The test starts with measuring the protective conductor resistance R

- If R

ishigherthan1Ω,themeasuredvalueofR

will be shown on the display and a

will appear next to the R

symbol. "FAIL" appears on the display to confirm that the

measurement has been stopped.

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Benning ST 725 Seite 37

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