Bedienungsanleitung Benning ST 750A (Seite 18 von 58) (Englisch)

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BENNING ST 750 A

10. Carrying Out Manual Measurements / Tests

First of all, each test begins with an inspection of the test object. Moreover, it has to be determined

which protection class (protective measure) the test sample corresponds to and which tests / mea-

surements (VDE regulation, manufacturer's accompanying documents, depending on the type of

the test sample) have to be carried out. The order of the individual measurements (tests) has to be

observed absolutely, because the measurement has to be stopped immediately in case of a failed

test. Only after troubleshooting, the test can be repeated right from the beginning.

Order of the individual test steps:

- Visual inspection

- Protective conductor test (if the protective conductor exists)

- Insulation measurement (if technically possible)

- Measurement of leakage current, protective conductor current and / or contact current

- Moreover: safe isolation; proof of further protective measures; inscriptions; functional test;

analysis, evaluation and documentation

If it is not directly possible to isolate the test sample from the electrical systems, proceed as follows:

- visual inspection

- protective conductor resistance measurement for devices of protection class I and

- contact current measurement on accessible protective parts of devices of protection class II

as well as on accessible parts of devices of protection class I which are not connected to the

protective conductor!

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The respective test steps and measuring types depend on the type of the test

sample!

Visual inspection

Important parts of the device contributing to its safety must neither be visibly damaged nor be obvi-

ously inappropriate for the device. This particularly applies to insulation and insulating parts which

areaccessibleduringrepair,modicationortestaswellasforhousingsofdeviceswithprotective

insulation (protection class II).

Examples for the application of visual inspections are:

- Melt inserts of fuses must comply with the parameters requested by the manufacturer (e.g.

nominal current intensity and fusing characteristics);

- Airlters(ifrequested)mustbebuiltin;

- Cooling apertures must not be blocked;

- Protective covers requested by the manufacturer must be used and must be attached in proper

condition and in due form;

- Coolingnsmustnotbeblocked;

- The markings provided by the manufacturer, particularly those contributing to safety (warning

symbols, characteristic data on fuse holders, switch positions on isolator switches and similar),

must be available and perfectly legible. If necessary, markings have to be corrected after modi-

cations.

- Mains connection cables (also enclosed device connecting cables) must not show any external

defects between the connecting point of the device and the connecting point of the mains;

- Strainreliefandbendingprotection(ifapplicable)ofthemainsconnectioncablemustbermly

attachedandefcient;

- There must not be any signs of overload or improper use;

- Itisnotallowedtomakeanyimproperinterventionsandmodications;

- Any contamination and corrosion affecting safety must be removed by cleaning.

At the beginning of a test (after requesting the corresponding VDE regulation and protection class),

the"VisualInspection"menuappearsonthedisplay.Conrmwith<OK> to continue with the test!

The tester is provided with a switchable test socket to contact the test sample. The additional test

sockets"L/N"areonlyconnectedin"TestSocket"mode.The"PE"testsocketisrmlyconnected

with the earthing contact of the test socket. For measurements to earth (test samples of protection

classes II) and for direct measurement of the leakage current, a measuring shunt in the milliohm

range is integrated into the cable for PE connection. Due to a correspondingly required measuring

arrangement,the"Sonde/Probe"jackisintendedformeasuring/testingtheabsenceofvoltageor

the contact current etc. according to DIN VDE 0701-0702.

For measuring device leakage current or for the patient leakage current etc. according to DIN VDE

0751,thespeciedmeasuringarrangement"MD"(DINVDE0751-1)isconnectedtothesamejack

("Sonde/Probe").



For this reason, it is absolutely necessary to preselect the correct VDE regulation

for the measurements / tests!

Connection test

Forthersttest/measurement,thetesterstartsaconnectiontesttodetermine,whetherdangerous

contact voltage is applied, whether a test sample is connected and that there is no short-circuit. After

a positive connection test, the measurement is started. In case of a negative connection test (e.g.

open switch), an information message is displayed. Another connection test will only be started

whenthe"VisualInspection"menuhasbeenpassedthroughonceagain.

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Attention! Pressing the <Pause> button will stop the measurement. During the pause,

the test socket will remain live!

10.1 Protective Conductor Test (Protective Conductor Resistance) R

This function is intended to measure the protective conductor resistance R

(devices of protection

class I). Measurement is made with a testing current of +/- 200mA DC according to DIN VDE 0701-

0702, VDE 0751-1 or a testing current of 10A AC (formerly: DIN VDE 0701 T260). For measuring,

the test cable (probe) is connected to accessible metal parts of the test sample and to the earthing

contactofthemainsplugbymeansofthealligatorclip.Connectthemainsplugtothe"testsocket"

oftheappliancetester.Ifnecessary,usethemeasuringjacks"PE"and"L/N"whichareconnected

inparalleltothe"testsocket".

Benning ST 750A Seite 18

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