HT instruments SIRIUS87 - Manual (Page 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
/I
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 
> 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.
U
n
/I
n
DIST