Manual Benning ST 725 (page 40 of 71) (English, German, French)

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01/ 2015

BENNING ST 725



permanent measurements at a high load current. If the admissible internal operating

temperature is exceeded, the "StOP" and "hot" symbols will be shown on the display. In this

case, the BENNING ST 725 must be disconnected from the mains and can be used again

after a sufficient cooling phase.

Note on measuring the contact current:

- Accessible conductive parts which are not connected with the protective conductor have to

be tested as described in section 9.2. For measuring the contact current (direct measurement

method), the BENNING ST 725 has to be operated with a mains voltage of 230 V.

- During contact current measurement by means of the direct measurement method, no part

of the test object must have a connection to the earth potential. The test object must be

placed onto an insulated surface. Otherwise, leakage currents to earth might influence the

measuring result.

9.2 Testing of devices of protection class II



(shock-proof) and of devices of protection

class III



(safety extra-low voltage)

Testing of devices without protective conductor and with accessible conductive parts

- Connect the test object to the test socket

of the BENNING ST 725.

- Establish a connection between the 4 mm test socket

and a metal part of the test object

by means of the test lead with alligator clip.

- For mains operating mode (contact current by means of the direct 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.

- 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

6kΩ).

- If "HIGH LOAD“ is shown on the display, this indicates an excessive load (R

L-N

<<14Ω,I

LAST

LOAD

) > 16 A) of the test object. There might be danger of a m short-circuit or of an earth

fault. Check whether there is a short-circuit between the external conductor (L) and neutral

conductor (N) of the test object.

- If there is no short-circuit, you can continue with the testing procedure by pressing the



-key

- If the insulating resistance R

ISO

is higher than the admissible limiting value, a appears

next to the R

ISO

symbol.

BENNING ST 725 in mains operating mode:

- The BENNING ST 725 interrupts the testing procedure after the R

ISO

(insulating resistance)

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 contact current I

LEAK

(direct measurement method).

- The contact current by means of the direct measurement method only starts as soon as the

mains voltage is correct applied.

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Benning ST 725 Manual

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