3M 2273 사용자 설명서

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 a 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.

Auxiliary frequencies are used to trace cables without using frequencies
supplied by the 2273 transmitter. The Receiver may be able to detect these
auxiliary frequencies, depending on the model:

31 kHz: For locating in-service CATV cables.

512, 560 Hz or 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 

 then press 

 to select the next auxiliary frequency.