Bedienungsanleitung Benning ST 710 (Seite 22 von 74) (Deutsch, Englisch, Holländisch, Französisch, Polnisch, Schwedisch)

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BENNING ST 710



8.2.2 Testing of devices of protection class II  (shock-proof) and of devices of protec-

tion 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 710.

- 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.

- 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

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 contact current I

is lower than the

admissible limiting value.

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

Note on measuring the insulating resistance for test objects of protection class III:

- Duetothepresetlimitingvalueof2MΩfortestobjectsofprotectionclassII,forthetesting

of test objects of protection class III it has to be observed that measured values between

thelimitingvaluesof2MΩ(protectionclassII)andupto0.25MΩ(protectionclassIII)are

indicated with a next to the R

ISO

symbol.

Seegure4: Testingof devicesof protectionclass II(shock-proof deviceswithout protec-

tive conductor and with accessible conductive parts) and testing of devices of

protection class III (safety extra-low voltage)

8.2.3 Cord test

The cord test can be used both for the testing of IEC power cords (device connecting cables

with IEC coupler) and for the testing of cable reels, multiple distributors and extension cables.

8.2.3.1 Testing of IEC power cords (IEC adapter cables)

- Connect the IEC power cord to be tested to the BENNING ST 710 by means of the IEC con-

nector

and the test socket

- Press the key

to start the automatic testing procedure.

- The test starts with measuring the protective conductor resistance R

- Depending on whether the value is higher or lower than the limiting value, a or a is

indicated next to the R

symbol.



The protective conductor resistance depends on the length and cross-section

of the line to be tested. It is possible that the measuring result is acceptable

although the BENNING ST 710 indicates a next to the R

symbol.

- Please refer to Table 1 for typical resistance values of lines.

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