3M Advanced Cable Locator 2250 User Manual

							loCaTIng a burIed Cable
receiver setup
Note:  Key descriptions can be found on the side of the Receiver.
Press 
 to turn the Receiver on.  
Press  
 to select the   power frequency (see section on  Selecting Passive 
Power Frequencies  on Page 12) for passive locating; otherwise, select the   
same frequency as the Transmitter. 
Press 
 to adjust the speaker volume as needed: off, normal, high, or 
high-expanded.  The high-expanded setting causes the audio to cut off below  
a certain threshold.
Press  
 to select a locate mode (Peak , Null , or Diff ).   
To select Special Peak mode: from Peak mode, press and hold 
 then  
press 
to toggle between Peak and Special Peak modes.  While in   
Special Peak mode, the peak flag will flash.  
Note:  Peak, Special Peak, or Null mode may require re-setting the  Receiver 
gain. Press 
 when the bar graph remains either fully  open or fully closed.  
This is not necessary in differential mode since the unit automatically adjusts 
the receiver gain.
Page 10 
						

							about Trace Modes
Peak: In this mode, as the antenna crosses the cable, the Receiver speaker 
volume increases to a maximum and the bar graph fills from both sides 
toward the middle. As the antenna moves off the cable path, the speaker 
volume decreases and the bar graph opens.
Peak with High-expanded: While in Peak mode, press 
 to select 
High-Expanded (the highest setting). Speaker response is cut off as the 
antenna moves away from the cable.
Null: In this mode, the signal is a minimum directly over the cable and is 
maximum on either side of the cable.  The speaker volume and display sig -
nal strength correspond to the signal being received.  In the normal bar\
 graph 
display mode (Null flag flashing) the bar graph opens at low signal strength  
and closes at high signal strength.  In the inverse Null bar graph displ\
ay 
mode (Null flag is on solid), the bar graph closes at low signal strength and 
opens at high signal strength.
Differential: In this mode, the Receiver provides an indication of the rela -
tive position of the cable to the Receiver by displaying right or left a\
rrows 
(the arrow points toward the cable). The bar graph increases to a maximum 
as the Receiver antenna is moved directly over the cable path. Speaker r\
e -
sponse is a high warbling tone to the right of the cable path, a low war\
bling 
tone to the left, and a solid tone directly over the cable. 
Special Peak Mode:   This mode will increase the signal sensitivity of the 
Receiver when the signal is too weak for normal tracing. Use special att\
en -
tion when using this mode because it is more susceptible to congestion t\
han 
the normal peak mode. 
Numerical Signal Strength Display resolution:  The user may select be -
tween 3 levels of signal strength resolution. The setting will be displayed on 
the right end of the bar graph during selection.To change the setting, press 
and hold the 
 key during power up then press the  key. Display 
resolution may be changed between the standard 1X, (no bars illuminated\
), 
2X, (One bar illuminated), and 4X (Two bars illuminated). The unit saves 
the last setting until changed. 
Note:  While tracing cables, keep the Receiver handle in line with the sus -
pected cable path.
Page 11 
						

							selecting Passive Power frequencies
See section Initial Receiver Configuration  (Page 3) to set the power fre-
quency 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.
selecting auxiliary frequencies
Auxiliary frequencies are used to trace cables without using frequencies\
 
supplied by the 3M™ Dynatel™ Advanced Cable Locator 2250 transmitter. 
the Receiver may be able to detect these auxiliary frequencies, dependin\
g on 
the model:
  31 kHz:  For locating in-service CATV cables.
  512 Hz,  560Hz   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.
Page 12 
						

							deTerMInIng Cable dePTh and CurrenT
Place the Receiver Antenna on the ground directly above the cable with 
the handle parallel to the path.  Press 
 and the display will indicate the 
cable depth and relative current 
. Current is displayed in the lower left 
corner of the display. Press 
 twice to continue tracing. You may also 
press 
 to return to Trace mode.
Note:  During a depth-current measurement, the display will exhibit 
     ' – – – '  when the received signal is too low, too high, or erratic.
Page 13 
						

							using Current  Indications during locating
Both the Transmitter and Receiver will indicate cable current.  These current 
indications will help to select a trace frequency, identify the correct cable 
and troubleshoot the set up.
When using the direct connect method, the Transmitter output current num -
ber is displayed.  A "LO" display, or number less than 50, indicates a weak 
tracing signal.  A number higher than 70 represents a strong tracing signal.  
When the Receiver is used to find the cable near the Transmitter connection 
point, the current number displayed in the Receiver should correspond (with-
in 5 points) to the Transmitter number, if: you are over the correct cable, 
AND most of the signal is flowing in that cable.
Note:  On the Transmitter every ten units on the current display represents 
a factor of two in current magnitude. On the receiver, trace current readings 
for 512Hz, 560 Hz and all additional auxiliary frequencies (except 31.5 kHz) 
are displayed in milliamps. For all other trace frequencies every ten units on 
the current display represents a factor of two in current magnitude.
When the Transmitter signal is applied using the 3M™ Dyna-Coupler, the 
Transmitter current display indicates the current in the coupler and not \
in the 
cable.  In order to get a measure of the cable current, point the Receiv\
er at 
the exposed cable about two feet from the Dyna-Coupler.  This will be the 
current number that should be used to identify the correct cable.
In general, when the Transmitter is set up to apply more current on the target 
cable than any other cable, the cable can easily be identified because the 
Receiver current reading will be highest.
Note:   Since some of the signal in the cable will bleed into the earth, it is \
expected that the Receiver current indication along the cable will decrease 
gradually away from the Transmitter.  This effect is more pronounced at 
higher frequencies.
Page 14 
						

							loCaTIng an aCTIve duCT Probe (adP)
Press  to turn the Receiver on.   
Press 
 to select the 33 kHz  frequency.
Press 
 to select the Peak mode .  If you find that the received  signal 
is too weak in this mode, try the Special Peak mode.  To select Special Peak 
mode: From Peak mode press and hold  
 then press  to toggle 
between Peak and Special Peak modes. While in this mode the Peak flag will 
flash.
With the Receiver handle  perpendicular to the conduit path, locate the ADP 
position by moving along the path until a peak is found.  
Press 
 when the bar graph remains either fully open or fully closed.  
Refer to the ADP operating instructions for further information.
determining adP depth
Place the Receiver Antenna on the ground directly above the located ADP 
position maintaining the handle orientation  perpendicular to the path. 
Press 
 twice to display ADP depth  .     
 
To return to trace mode, press 
 or  . 
Note:  During a depth-current measurement, the display will exhibit   
  ' – – – ' when the received signal is too low, too high, or erratic.
Page 15 
						

							TonIng aerIal faulTs
Transmitter setup
Perform a battery test; then with the Transmitter off, plug the direct connect 
cable into the front panel jack.
If fault is a shorted pair, connect Red clip to tip and the Black clip to ring.
If the fault is a cross (two pair involved), connect the Red clip to c\
rossed 
conductor of one pair and the Black clip to the crossed of the other pai\
r.
If the fault is a ground, connect the Red clip to the faulted conductor \
and the 
Black clip to ground.
Press 
 to turn the Transmitter on in the Ohms mode  to verify the 
fault.  Press once more to select the Tone mode 
. 
Press 
 to change the high output level.
receiver setup
Press  to turn the Receiver on.  
Press 
 to select Tone mode  .
Connect a toning coil to the Receiver accessory jack.
Press 
 to select the low toning frequency (577 Hz). 
Move the toning coil along the cable and find a peak signal then  
press  to adjust the Receiver gain.
Press  to adjust the speaker volume as needed. 
Follow the cable with the toning coil. An aerial fault is located at the   
point where the tone stops or drops off sharply.
Page 16 
						

							Cable or PaIr IdenTIfICaTIon
Transmitter setup
Transmitter setup is the same to identify cables or pairs, however, Receiver 
setups are different.  Perform a battery test; then with the transmitter off, 
connect the 3M™ Dyna-Coupler to the Transmitter front panel jack using 
the coupler cable. 
Note:  Cable Identification requires two Dyna-Couplers: one at the   Trans-
mitter and one at the  Receiver. 
Clamp the Dyna-Coupler around the cable or both and tip and ring of a pa\
ir 
and make sure the jaws fully close.
Press 
 to turn the Transmitter on and then twice more to select the Tone 
mode 
. 
Press 
 to change the high output level.
Cable IdenTIfIC aTIon
receiver setup
Press 
 to turn the Receiver on.
Press 
 to select Tone mode  .
Connect a second Dyna-Coupler to the Receiver accessory jack using the 
earth frame cable or another coupler cable.
Press 
 to select the highest toning frequency (200 kHz).  Check the first 
cable in the group by clamping the Dyna-Coupler around the cable. Press \
 and observe the numeric display, which is relative signal  strength.  
Remember the number and continue by clamping the Dyna-Coupler around 
the next cable in the group. If the signal strength is  greater than the previous 
observation, press 
. If the signal strength  is less than before, ignore it. 
After checking all the cables in the group, the cable with the highest r\
eading 
is the one being identified.
Page 17 
						

							PaIr IdenTIfICaTIon
receiver setup
Press 
 to turn the Receiver on.
Press 
 to select Tone mode  .
Connect the inductive probe to Receiver accessory jack using probe cable.
Press 
 to select the highest toning frequency  (200 kHz).
Insert Probe into the bundle of pairs (or group, if known) and press 
 . 
Next, divide the pairs into two bundles and insert the Probe into each o\
f the 
bundles and observe the numeric display.  The bundle with the highest reading 
will contain the target pair. Continue by dividing the bundle with the target  
pair into two parts and checking each part for the highest signal. In th\
is way 
the target pair will be isolated.
Page 18 
						

							oPTIonal 3M™ eleCTronIC MarkIng sysTeM (eMs) aCCessorIes
 3M™ 6" Dyna-Coupler with Pouch, 1196
  3M™ Soft Carrying Bag 2200 Series
  3M™ 4.5" Dyna-Coupler 4001
  3M™ Dynatel Locator Coupler Accessory Kit 4519
  3M™ Cable Locator Coupler Accessory Kit 3019
  3M™ ADP 33KHZ Sonder for use with Dynatel Series Locators 3229
  3M™ Coupler Cable 9011
  3M™ Ground Extension Cable 9043
Page 19