g) The Light Bar Meter. This solid-state LED bar meter pro-
vides a visual indication of the level of signal presently
being received. As described above, the response meter
will indicate both peaks and vanishing points in the signal
surrounding the line being traced.
h) Speaker. A water-resistant, small but powerful mylar
speaker delivers a strong audio output corresponding to
the signal received by the 902. In tracing mode, the sound
will track the LED meter response; however, in mass-
locating mode, the speaker delivers a continuous tone,
the frequency of which will rise when the receiver is
brought near to a metallic mass.
i)
Headphones
Jack. All sound normally supplied by the
speaker will be channelled to headphones when the
headphone plug is inserted here.
j)
45° Level Guage.
When making a determination of line
depth, the operator will often find this small level helpful.
Oriented at a 45° angle with respect to the antenna, the
bubble in the level will center itself when the antenna is
positioned at 45° compared to level ground.
See section
D
of this manual for more information on determining line
depth.
3. Direct-Connection Cable (DCC).
Included with every Model 902 instrument, this accessory
consists of a phone jack wired to two separate copper
clamps. Use this cable to inject the transmitter signal directly
into a specific line, thus conductively energizing it. To
accomplish this, connect the red clamp to the exposed line,
and optionally attach the black lead to some ground if
increased tracing distance is desired.
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