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78-9000-0192-2 Rev C 33
• Optional step: Press Clear All [SK] to delete all
stored depth information.
− The operator may select a specific memory
location to store the depth readings by pressing
Mem Select [SK]. When the preferred location
appears on the display, press Save [SK]. The
display and memory location will populate with
the current information.
− Each memory location can be reviewed by
pressing Mem Select [SK].
• Press TRACE [2] or DEPTH [4] to return to Locate
mode, or wait until receiver automatically returns
to the Locate mode.
9. Locating Frequencies
A. Active Frequencies
Active frequencies are trace signals supplied by a 3M
™
Dynatel
™
Transmitter 2500
Series (577 Hz, 1 kHz, 8 kHz, 33 kHz, 82 kHz or 200 kHz).
• Select the same frequency that the transmitter is generating.
• Press Menu/OK [5] (you may have to press Menu/OK [5] twice to toggle to the
LOCATE MENU display).
• Press Cable/Pipe[SK]
• Press Freq [SK]
• Press Active [SK Toggle] until the desired frequency is displayed: (“Active” 577, 1k,
8k, 33k, 82k or 200k)
• Press Menu/OK [5] to return to Locate mode.
B. Power Frequencies
Power frequencies refer to 50 or 60 Hz signals, and their harmonics, that can be traced
without the use of a transmitter.
60: Best for general locating of passive power.
60H (high harmonic): If the 60 choice appears to be responding slowly, or poorly, then
60H is the second choice for locating passive power.
60L (low harmonic): Third choice for passive power locating. May be used when 60 or
60H is weak or erratic. 60L may be the best choice when locating primary power cables.
120 Hz: Used for locating rectified AC power signals, often found on pipelines using
impressed current cathodic protection.
• Press Menu/OK [5] (you may have to press Menu/OK [5] twice to toggle to the
LOCATE MENU display).