Ht-instruments SIRIUS87 Manual de usuario descargar pdf (Pagina 18)

SIRIUS 87

EN - 16

4.2.1. Procedure to measure insulation resistance in any modes

1. Select the desired mode by means of the FUNC key.

2. Connect the black and blue cables to the instrument input terminals B1 and B4

respectively

Fig. 3 Insulation P-PE with untied cables Fig. 4 Insulation P-PE with Shuko cable

3. If the cables supplied with the instrument are not long enough for the measurement you can

extend the blue cable.

4. Connect the instrument terminals to the object which is to be submitted to the insulation

test after disconnecting the circuit under test and all the relative loads (see Fig. 3,

Fig. 4)

5. By means of U

n

select the test voltage suitable for the type of test

to be carried out (see table). The values to be selected are:

 50V (test on telecommunication system)

 100V  500V

 250V  1000V

Standard Brief description Test voltage Maximum limit value

CEI 64-8/6

Systems SELV or PELV

Systems up to 500V (Civil installations)

Systems over 500V

250VDC

500VDC

1000VDC

> 0.250M

> 1.000M

EN60439 Electrical panel boards 230/400V 500VDC

> 230k

EN60204 Electrical equipment of machines 500VDC

> 1M

Table 1: Test voltage values and limit values for the most common kinds of test

CAUTION

If “Measuring” is displayed the instrument is effecting the measurement.

During this phase do not disconnect the test leads as the circuit under test

may remain charged at a dangerous voltage due to the parasite capacities of

the installation. Independently of the working mode selected the instrument

throws a resistance in the output terminals at the end of each test to

discharge the parasite capacities of the circuit.

n

DIST

1 2 ... 13 14 15 16 17 18 19 20 21 22 23 ... 87 88

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Ht-instruments SIRIUS87 Manual de usuario Pagina 18

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