Vivax Metrotech vLocML2, Руководство пользователя

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6 Loc-10Tx Transmitter
Page 39 of 72
Regulations in many countries require that power output is limited above certain frequencies. The Loc-10Tx
enables frequencies below 45 kHz to be transmitted using as much as 10 watts output, but frequencies over
45 kHz are restricted to 1 watt. Using direct connection and the higher power at the low frequencies helps
significantly in achieving greater location distances. Direct connections should not be made to cables carrying
greater than 35 volts (or as your safety practices allow). The transmitter is protected (250V fuse) from stray
currents that may exist on the target line.
6.3.3 Clamp Mode
Plugging the signal clamp supplied by Vivax-Metrotech into the output socket will place the transmitter in
“Clamp” mode. An icon confirming this is displayed on the display. The icon flashes when the transmitter is
transmitting. When using the clamp no ground connection is needed.
The clamp again is a precise way to apply the locating signal. It is generally used when access to the
conductor cannot be achieved to make a direct connection (but there is sufficient access to place the clamp
around the cable), or when it is not safe to make a direct connection because the target cable is carrying
electricity.
The clamp is a specialized inductive device (sometimes known as a toroid or coupler). All clamps are
optimized to work at specific frequencies. In most cases clamps are designed to be used at up to three
frequencies only, generally between 8 kHz and 85 kHz. The transmitter will only allow the selection of a
suitable frequency for your clamp.
WARNING
When applying the clamp to cables that carry electricity – be sure to follow
your company’s safety instructions and procedures. Beware that if applied
around a high voltage cable – that cable may induce a current in the clamp
causing it to snap shut or jump quite dramatically – always apply clamps
carefully.
6.3.4 Connection Block
1 Output Connection
2 Output Protection (Fuse)
3 Loudspeaker
4 Battery Charging Socket & DC Input
All the connections made to the transmitter are made at the connection block except for a USB socket which
is mounted inside the battery compartment and is used for programming the transmitter’s processor.
The connection block consists of:
•
Output (XLR) socket – for the direct connection lead and clamp.
•
Charger socket (to allow the retrofitting of a rechargeable battery pack – the charging socket is
present even if re-chargeable batteries have not been purchased).
•
Transmitter 12V DC power lead used to power the transmitter from a vehicle (NOT for charging).
•
Fuse – this protects the transmitter circuitry in the event of the transmitter receiving up to 250V
incoming on the output leads.
•
A beeper is positioned behind the small hole.
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