TW-8800 TRANSMITTER
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Located on the transmitter are the power mode and
the frequency selector. The power mode enables
the operator to turn the transmitter on or off, and to
check the condition of the batteries. When check-
ing the batteries, a reading of 50 or greater on the
display meter indicates that batteries are usable.
Battery usage is dependent upon the frequency
that is being used. The higher the frequency, the
longer the battery life. The frequency selector is
used to select the transmitted frequency. Only one
frequency can be selected for transmission.
Other items on the transmitter include the plug-in
socket for the ground plate/ground rod assembly,
and for the coupling clamp. There is a Red LED that
blinks when the transmitter is on. The batteries are
located underneath the lid on top of the Transmit-
ter housing.
Transmitter
WARNING:
Do not handle output leads unless power is off.
ELECTRIC SHOCK HAZARD:
Servicing to be performed by
qualified personnel only.
DEPTH ACCURACY
Depth measurement is a feature of the TW-8800. Accuracy is
defined on an ideal target; that is, one that is continuous, a good
conductor, and not surrounded by other utilities. There are several
factors that can cause the operator to question the accuracy of
the utility being traced.
Inductive Transmitter Setup
Inductively, only a small portion of the signal attaches it-
self to the utility. With a weakened signal, trace should be
accurate, but depth may not. The conductive method
will yield better results.
Low Receiver Signal Strength
When the signal strength falls below 20 – 25%, depth
readout may not be accurate. It would be beneficial to
move the transmitter to a closer point of contact.
Nearby Utilities
Close, nearby utilities may have some influence on the
accuracy of the Depth readout. This is more prone to
happen in the higher frequencies where signals can jump
to nearby utilities. Switching to a lower frequency can
give better results.
Moisture
Ground that is too dry or overly saturated may skew the
depth readout.
“T’s”, elbows, or splits in the utility can distort the
transmitted signal in that general area.
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WARNING:
Do not connect output leads to a live (ener-
gized) utility. Please prevent shock hazard and equip-
ment damage.
The TW-8800 Transmitter.
