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4 Basic operation path detection
4.1 Path detection
The detection path is one of the main functions of this instrument. Different fields can
choose different signals to be applied, and the priority of selection is: direct
connection, coupling and induction. The reception of the signal is not affected by the
way the signal is applied, and the operation is the same.
4.1.1 Direct connection method detection path
1. Direct connection conditions:
1) It must be a power failure cable.
2) Know at least one end of the cable and separate the known end head from the
system, including zero line and ground wire.
2. Signal application: (transmitter)
1) Straight line multi-core air head is connected with the transmitter multi-core air
base (outlet).
2) The red clamp is connected to a certain phase of the tested cable; If the condition is
available, the other end of the phase can be grounded. The effect is better.
3) The black clip is the working place of the transmitter. The selection principle of the
location is that the reflux signal cannot be returned from the cable, and the influence
of the reflow signal to the test is minimized. In general, the grounding pole is required
to be isolated. The method is to remove the ground bit from the cable and insert it into
the wet soil. When the cable is completely separated from the system, the location can
be selected systematically.
4) After connecting the line, press the power switch and the transmitter begins to work;
If the instrument is opened when the connection is not connected, press the power
button and the transmitter will start to work. Automatically detects the loop
impedance to ensure that the work in the best match output state, when the liquid
crystal area of concentric circles icon at the lower right starts moving, that transmitter
is stable work, the loop impedance value has been observed at this time, generally in
the 1-3000Ω is more appropriate, if more than 3000Ω, shows that the impedance is
too big, circuit of the signal is very weak, from the following three aspects to adjust to
improve.
First, to improve grounding conditions of grounding poles, humidification or
switching systems.