30
30
NOTE.
In the course of charging it is recommended to periodically monitor: « » or « » - voltage on
the charged internal accumulator and « » - voltage on the power adapter output. If « » or
«
» exceeds the maximum allowed «14,9», one should “specify” the output voltage POWER
ADAPTER (optimal value «15.0…15.2») using its adjustment resistor output “under flat
screwdriver”. The readings «
» or «
» above «14,9» correspond to the start of “overcharging”
and increased internal gas output. The continuous stable readings below «14,7» indicate lowered
output voltage of power adapter.
4. The joint operation of generator and receiver during active route detection
The inductive (active) search method is now most widespread for detection of underground
buried utilities. The basis of the method is the fact that there is an electromagnetic field around
the conductor with current.
The generator connected to one end of the monitored buried utility serves as a source of test
current of special frequency. For flowing of the current it is necessary to have a special electric
conductive circuit with monitored buried utility as one branch and grounding as another branch
for return of current through the ground.
The maximum strength of the electromagnetic field measured above the ground surface
corresponds to the axis of searched buried utility.
To properly operate the kit the following rules are to be observed:
-
Generator grounding selection (refer to p.3.3);
-
Definition of generator connection type (refer to p.3.3);
-
Setting of generator parameters (refer to p.3.5);
-
Adjustment of receiver (refer to p.2).
After performing the above items, you can start buried utility tracing.
5. Tracing procedure in active mode
-
Set mode “3F” on the generator
-
Select the frequency “1024” on the receiver. Set the amplification level of
50%. Set mode
of maximum. Keep the receiver strictly upright, survey the area slowly and evenly.
-
When the signal is detected, continue movement in the search direction until the signal
is reduced, then return to the place where it was the highest.
-
Without changing the amplification level change alternately the frequency on the receiver
to 512 Hz, then to 8928 Hz. After each frequency change fulfill test tracing. As a result,
determine the optimum frequency, depending on one or several tasks. Set generation
mode to the selected frequency on the generator (see p.3.5).
-
To define the buried utility axis direction by the mode of maximum (see p.2.10) turn the
receiver until the strongest signal is achieved. The receiver handle will be PARALLEL to the
searched buried utility. Slowly move the receiver to the left
–
to the right till the maximum
of the signal is reached. In this point the receiver is directly above the route axis, one can
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