HT 400 Series, User Manual

Page: 14 / 88

400 Series
EN - 12
6. OPERATING INSTRUCTIONS
Press (short pressure) the key to activate the display’s backlighting should it
be difficult to read the display.
Press (long pressure) the
HELP
key to display an indicative scheme of the
connections between the instrument and the system being tested in the function set
Should more help screens be available for the same function, use the

and

keys to scroll them.
Press the
ESC
key to exit the on-line help and go back to the selected
measurement.
6.1. AUTO
This function enables performing an automatic sequence of tests, including the main tests
regarding the electric safety of a system, i.e.:

Measurement of earth resistance through socket-outlet

Measurement of RCD tripping time

Measurement of insulation resistance between phase and earth
CAUTION
Testing the RCD’s tripping time causes the RCD’s tripping.
Therefore, check
that there are NO users or loads connected downstream of the RCD
being tested which could be damaged by a system downtime.
Disconnect all loads connected downstream of the RCD as they could
produce leakage currents further to those produced by the instrument, thus
invalidating the results of the test
Fig. 4: Instrument connection through shuko cable
Fig. 5: Instrument connection by means of single cables and remote probe