Sekotech ST-300 SPIDER, Руководство по эксплуатации, Страница: 58 / 68

ST300 SPIDER
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As the detection range is no more than 20-30cm, it is advisable, while tracing, to keep the Receiver
2-3cm away from the surface behind which the cable should be.
It is important to follow the correct trajectory. In the upper part of Fig. 63 the trajectory is incorrect:
in this way, branches of the traced line (blue) may be missed out, which is unacceptable.
A recommended trajectory is shown in the lower part of Fig. 63. No branching will remain undetected.
For a preciser tracing of the cable route, sensitivity of the receiver should be decreased.
PROCEDURE
Connect the Electronic Switch to the Main Unit of ST300 (1.3.3).
Disconnect all devices from the line. Make sure there are no known connections (branches).
Connect the line to be tested to the Electronic Switch (the way of connection depends on the cable
type).
With the Cable (26, Fig.1) connect the “PHONE” socket of the Main Unit to the ground (e.g., to the
ground contact of an electric outlet, or grounded housing of any equipment).
Turn on ST300 and go to the Start Menu (2.1 – 2.2).
Go to the main screen of the “SWITCH” mode (“F4” button).
Activate the “CABLE LOCATOR” mode (“FUNC” button).
Set the contact number through which the test signal is to be applied.
If a cable type has been set, the numbers of contacts that are not used with certain cable types (see
2.5.1.1) will be disabled.
If the cable type has not yet been set, it is important to understand which contacts of the Electronic
Switch can be used, when setting the contact number in the “CABLE LOCATOR” mode. For example, if
the cable is connected to the Electronic Switch through the first four contacts (1,2,3,4), it is one of these
four that should be selected.
Insert batteries into the Receiver of the Cable Locator, mount it onto the telescopic arm and insert the
plug (3, Fig.6) into the socket (1, Fig.5), as described in 1.3.4.
Turn on the Receiver of the Cable Locator by pressing and holding down the “POWER” button (2, Fig.5).
Using the “GAIN” button (5, Fig.5) set the Receiver to medium sensitivity, with two green LEDs lit (4,
Fig.5).
Perform a functional check on the receiver and generator of the Cable Locator, by bringing the receiver
up close to Main Unit of ST300. Under normal operation, a two-tone sound will be heard from the speaker.
Passing the receiver unit along the cable as shown in Fig. 63, in the direction away from the Main Unit,
monitor the two-tone test sound through the speaker. The further from the Main Unit, the weaker the
test signal will grow in the cable, therefore, increasing the receiver’s sensitivity with the button “GAIN”
(5, Fig.5) may be helpful.
Trace the whole route of the cable throughout the facility. It may be wise to mark it out with paper
stickers (plastering them on walls, ceilings, etc.) or otherwise.
3.7.2. Cable Locator of ST300 in Use: Contact Search
At times it is necessary to find the connections (contact terminals, pads, etc.) of the cable to telephone
junction boxes. To do that, contact search is required.
For a contact search, there is no necessity to ground the ST300 Main Unit, or use the telescopic arm
with the receiver.
PROCEDURE
Before proceeding, make sure there is no voltage on the cabling to be tested!
Connect the Electronic Switch to the Main Unit of ST300 (1.3.3).