3M 2273E - Manual (Page 6)

LOCATING A BURIED CABLE
Transmitter Setup
Note: Key descriptions can be found inside the Transmitter lid.
Perform a battery test and then connect the Transmitter using one of the
three methods below to put tracing signal on a cable.
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Danger!
Voltage higher than 240 volts will damage equipment and cause personal
injury and death. Make all direct test connections before turning on the
Transmitter. Then activate the Transmitter in the Ohms mode and check
the display for voltage readings. Follow standard procedures for
reducing the voltage.
Warning!
Potential for electrical shock exists when handling connecting cables
while the Transmitter is in the TRACE, FAULT or TONE modes. Turn
the transmitter off before handling connecting cables.