3M 2273E - Manual (Page 8)

Press to select Trace mode. Press again to select one or all of the
four frequencies. The display will alternate between displaying the
selected frequency and the output signal current. It is best to choose the
lowest frequency for direct connect with far-end ground and a high
frequency for direct connect with no far-end ground.
Press to select high output level for longer tracing distances and
deep cables.
Transmitter setup is finished, now go to LOCATING A BURIED
CABLE - R
ECEIVER S ETUP (P AGE 10).
Page 7