Amprobe AT-8000 Serie Manual De Usuario página 13

2. KIT COMPONENTS
Transmitter signal modes:
High Signal (Hi) – The HIGH mode function is recommended for most wire tracing
applications on Energized and De-energized circuits including breaker/fuse location. This
function will be used the majority of the time.
Low Signal (Lo) – The LOW mode function is only appropriate for the most demanding and
precise wire tracing applications, as it limits the signal level generated by the Transmitter
in order to pinpoint the wire location more precisely. A lower signal level reduces coupling
to neighboring wires and metal objects, which avoids misreadings due to ghost signals. A
lower signal also prevents oversaturating the Receiver with a strong signal that covers too
large of an area.
Loop mode – This mode is initiated by pressing and holding the HI button for >2 seconds. It
should be used when working with closed loop De-energized circuits, such as shorted wires,
shielded cables or De-energized wires that are grounded on the far-end.
How is the Loop function different from the Hi or Lo settings when using test leads?
Both HIGH and LOW modes generate a signal in all open branches of the De-energized
circuit. This is useful when tracing open wires. Hi/Lo modes will NOT work on wires that are
shorted (closed loop) or grounded on the far-end because the signal cannot be generated.
Figure 2.2a: Generating a signal with HIGH and LOW modes and closed loop
Loop mode generates a signal (current flow) in closed loop De-energized circuits only. Loop
mode is used to pinpoint the location of a short (because the current will not be able to
flow in open branches) and to trace wires that are grounded on the far end (because the
loop is closed via ground connection).
Figure 2.2b: Generating a signal in Loop mode
Note: Loop mode only works on De-energized circuits. However the receiver needs to be set
to Energized sensor mode (the transmitter creates safe low voltage state). It is automatically
disabled when the Transmitter is connected to an Energized line with test leads.
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