|
Performance
By operating the 8875 receiver at multiple frequencies, the performance
can be optimized for the specific needs of the user. The low frequency
of 815Hz provides a longer range of locating and has fewer errors from
adjacent cables. The high frequency of 82kHz will path locate past bad
telephone bonds, underground stubs and permit inductive locating with
either the optional Flexi coupler or by using direct soil induction. The
8875 has excellent passive 60Hz locating and the receiver will pinpoint
active power lines and other utilities.
Push Button Depth
The 8875 locator has the
added capability of determining the depth of a conductor with the push of a
button. On the LCD display, depths up to 15 feet are quickly displayed in
inches or centimeters.
Absolute Signal Strength
To make identifications
easier, the absolute signal strength is continuously displayed on the
8875 LCD display. Position the receiver over the target cable and simply
look for the highest number displayed in peak mode or the lowest number
in null mode. The absolute signal strength can also identify a loss of
signal-to-ground caused by damaged cable, insulated pipe bushings or by
shorted pipes.
Flexibility
The advantage of high power
at low frequency with the 8875 solves the difficult multi-point grounded
utility locating problem. Low frequency (815Hz) virtually eliminates the
false coupling into adjacent objects and allows the high transmitter
power to burn a signal past several grounds and into multiple
distributed grounds. The high power at high frequency provides excellent
inductive coupling and direct soil induction. The circuit will bridge or
jump across an open or damaged cable and no direct connection is needed.
Conductor Current
Readout
The 8875 locator gives the
user information on the amount of current flowing on the target
conductor with correction for changes in a conductor's depth. To trace
the direction where the transmitter signal is divided or where it goes
into the soil at an insulation ground fault, push and hold the current
button. This feature is successful when used on a cathodically protected
system with ground faults.
Battery Options
The 8875 transmitter has
the option of a built-in rechargeable battery (8875-01).or the option of
"D" cell alkaline batteries (8875-00).
Normal and High Power
A high power transmitter is
a superb asset in field locating. The "On" (normal) power setting at
200mW on high frequency is typically adequate. This operating mode
conserves battery life and limits high frequency spillover during
routine locates with normal power.
Optional Fault Locating
The 8875 instantly becomes a fault
locator when the receiver is attached to the optional Ground Return
Probe (GRP). The GRP can be used whenever sheath damage is suspected. |
