HT instruments MACROTEST G3 - Manual (Page 17)

MACROTESTG3 - COMBIG3
EN - 16
6.2. M : MEASUREMENT OF INSULATION RESISTANCE
This function is performed in compliance with standards IEC/EN61557-2 and allows
measuring the insulation resistance between the active conductors and between each
active conductor and the earth.
CAUTION
 The instrument can be used for measurements on installations with overvoltage
category CAT III 240V to earth and CAT III 415V between inputs. Category CAT
III is suitable for measurements carried out on installations inside buildings with
low voltage (examples are distribution boards, wirings, switches, fixed installation
sockets, electric motors, industrial equipment).
 We recommend holding the alligator clip respecting the safety area created by
the hand protection (see § 4.2).
 Check that the circuit being tested is not live and that all possible loads normally
connected to it are disconnected before carrying out insulation measurement.
The following operating modes are available:
AUTO The test is activated by the GO/STOP key of the instrument (or START of the
remote lead) and lasts 2 seconds. Recommended mode
The operator may set a sufficiently long measuring time (1s  999s) to be able
to move the test lead on the conductors being tested, while the instrument is
carrying out the test. For the whole measurement duration, the instrument will
give out a short sound every second. While measuring, if the insulation
resistance reaches a lower value than the set limit, the instrument will give a
continuous acoustic signal. To stop the test, press again the GO/STOP key on
the instrument or the START key on the remote lead.
Fig. 8: Insulation test between phase and earth by means of single cables and remote lead
Fig. 9: Insulation test between phase and earth by means of shuko plug