3M 2273E - Manual (Page 13)

Selecting Passive Power Frequencies
See section Initial Receiver Configuration (page 3) to set the power
frequency to 50 Hz or 60 Hz. The Receiver can be tuned to locate 3
different harmonics of the chosen power frequency.
H50 Hz or H60 Hz (high harmonic): Best for general locating of
passive power.
L50 Hz or L60 Hz (low harmonic): Works best on primary power
cables. May be used when high harmonic is weak or erratic.
100 Hz or 120 Hz : For locating rectified AC power signals, often
found on pipelines using impressed current cathodic protection.
When the Power frequency is selected, the Hz symbol will flash, indicating
that alternate frequencies are available. To change the selected power
frequency, press and hold
then press to select the next Power
frequency.
Selecting Auxiliary Frequencies
Auxiliary frequencies are used to trace cables without using frequencies
supplied by the Transmitter (2273E only). The Receiver may be able to
detect these auxiliary frequencies, depending on the model:
LF: General VLF locating
Other frequencies for locating cables connected to a remote
location transmitter with that frequency.
If your Receiver has multiple auxiliary frequencies, the HZ symbol will
flash when one is selected. To change the selected auxiliary frequency,
press and hold the then press to select the next auxiliary
frequency.
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