Vivax Metrotech vLocML2, Руководство пользователя

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9 Using the vLocPro2
Page 54 of 72
Do NOT plug the clamp into the transmitter before applying it to the target line. Open the jaws of the clamp,
place around the target line, close the jaws. Be sure that the jaws of the clamp are completely closed. After
applying the clamp, plug it into the transmitter, switch on and select the required frequency. Clamps are
generally turned to specific frequencies. Your transmitter only allows frequencies that are compatible with the
clamp to be selected.
Please note – at the end of the clamp, and in the area close to the clamps hinge the exposed end of the
clamp laminations can be seen. Any dirt or corrosion on these ends will reduce the efficiency of the clamp.
WARNING
ALWAYS follow the appropriate safety requirements mandated by safety
legislation, safety practice or your company’s safety procedures when applying a
clamp (coupler) to a cable.
BEWARE that when placing a clamp around cables carrying high current, the
clamp may vibrate, jump or close violently due to inducted current from the target
cable.
9.3.3 Induction
This is used when no connection via direct connection leads, or coupler is possible. If no connection leads or
clamp are connected to the transmitter, it will automatically select “Induction” mode.
An induction loop is fitted inside the handle of the transmitter. The transmitter must be placed over the target
cable with the handle over and in line with the target pipe or cable. The induction loop is tuned to operate at
specific frequencies. Only these frequencies can be selected when in “Induction” mode.
Do NOT place the transmitter on a manhole cover, or any other such metallic object, as that object will shield
or soak up the signal resulting in little of no signal being induced in the target line.
When using the “Induction” mode to apply a signal to a line, ensure that a minimum distance of 50ft
(20m)
is
maintained. This is because the transmitter will transmit signal through the air which will interfere with signals
from the cable, resulting incorrect information.