HT instruments HT7051 - Manual (Page 20)

HT2055
EN - 19
Perform step/contact voltage measurements
8 Use
or keys and select the CONTACT VOLT or STEP VOLT measurements
on the meter unit
Fig. 21: Screens for step/contact voltage measurements
9 Use ,, and  keys and perform the settings of the following test parameters:
Igen
Test current (manual setting considering the range 0.20A ÷ 50A) or
automatically fitted by the station unit during the synchronization
Iflt
Maximum fault current of earth system (range 10A ÷ 200kA)
Rinp Input resistance of the meter unit (1M , 1k)
Ulim Limit value for step/contact voltage measurements (range 1V ÷ 10kV)
Iflt  Fault current value given by the Mains Energy provider
Rinp  Input resistance fixed to 1k
 for step/contact voltage measurements
Ulim  Voltage limit given by Guidelines according to the time of fault elimination by the
protection devices
10 Place and connect the test metal plates to each other where the operator stands, close
to the points where step voltage measurement (see Fig. 17) or contact voltage (see
Fig. 18) is required respecting the necessary distances
11 Connect the metal plates to the meter unit by using the cables supplied
12 Press TEST key on the meter unit and perform the step voltage of the contact voltage
measurements. The following screens are displayed by the meter:
Fig. 22: Screens for results of step/contact voltage measurements
Where:
U  calculated step/contact voltage
Um  measured step/contact voltage
13 Press MEM key to save the result inside memory (see § 8.1)