Step / Contact Voltage Tester with up to 50A Test Current

HT2055 is composed of a station and a meter designed  to perform step/contact voltage measurements on electrical installations such as HV power stations (TN systems, electrical substations) with rated test current up to 50A according to international guidelines. Both units, initially synchronized in time and current, can perform an exact calculation of step and contact voltage values applying the real test current measured by the station.

A internal DSP filter also performs the automatic compensation of  noise voltage disturbances affecting the measuring circuit. The instrument permits also measurement of earth resistance with 3-wire method and ground resistivity with 4-wire Wenner method. All results can be saved into an internal memory and downloaded  to PC through Windows software.

DESCRIPTION OF PARTS

Fig. 1: HT2055S Unit Description   1 Protection fuse on mains 2 Switch for supply voltage selection (110/230V) 3 ON/OFF key to switch the instrument ON or OFF 4 Input connector for mains cord 5 RS-232 galvanic port for connection to HT2055M unit 6 C1/H terminal for connection of auxiliary earth probe 7 P1/S for connection of auxiliary voltage probe 8 P2/ES for connection of auxiliary current probe 9 C2/E for connection of auxiliary earth probe 10 HELP key 11 – 12 a and keys for function selection and parameter settings 13 LCD display with backlit 14 Key for adjust contrast of display 15 MEM key for access to internal memory (see § 8) 16 ESC key to return at previous screen 17 ◄, ▲, ►, ▼ arrow keys and TEST key to activation measurements

Modify of supply voltage for HT2055S unit

1. Open the fuses compartment (see Fig. 1 – Part 1) with a screwdriver
2. Extract the red switch (see Fig. 1 – Part 2) from the fuses compartment
3. Rotate the switch in way to correctly read the “115V” or “230V” indication correspondent to the desired supply voltage
4. Restore the switch in the fuses compartment and close it

DESCRIPTION OF TEST LEADS

Front view

1	ESC key to return at previous screen
2	MEM key for access to internal memory
3	◄, ▲, ►, ▼ arrow keys and TEST key to activation measurements
4	Backlight key
5	LCD display
6	ON/OFF key to switch the instrument ON or OFF
7 - 8	and keys for function selection and parameter settings