HT instruments HT5000 - Manual (Page 20)

HT-5000
EN - 19
4.3.2 General site surveying
A general site probing urgently needs to be conducted and there is inaccurate or no
information available as to the location and orientation of metallic conductors on a site
planned for construction (e.g. excavation work).
When a site is to be searched for unknown conductors, a systematic approach should be
taken. The following picture illustrates how to proceed:
Fig. 13: General site surveying
Carry out a passive survey in POWER GRID and RADIO modes using a grid search
pattern to cover the site and locate conductors in all directions
If the site will be surveyed with the aid of the TX5000 transmitter used on induction, the
position of the transmitter should be changed by at least one metre and 90° after the first
sweep of the site and the site should be probed again in the same manner. The minimum
spacing of 15m between the transmitter and receiver must always be maintained
Follow the steps below when probing a site for unknown metallic conductors:
Step Action
1
If the site will be searched with the aid of the TX5000 transmitter, it
needs to be configured as described in paragraph 4.2.3 before
proceeding
2
Press to switch on the receiver RX5000
3
Select the desired mode of operation by pressing the key (see
paragraph 4.3.1). The symbol for the currently selected mode of
operation is shown in the lower right-hand corner of the display
4
Pace off the site as previously described and make a grid search of
the site (see Fig. 13). Adjust the sensitivity of the receiver as needed
if the signal level is too strong / weak (see paragraph 4.3.1.1)
5
When a conductor is located, pinpoint the strongest signal (see
paragraph 4.3.1.2) and mark the location
3