Page 18 - Damage Prevention Journal 2018 Issue 4
P. 18

ByNighswmigzr 3
typical line detection receiver unit is designed tn take signal field becomes distorted or no longer perfectly round,
many types nt measurements withln a signal held the accuracy nt the equipment is affected. The degree of ei-rnr
that is perfectly round and pulsing at a known or set or the signal receiver is directly prnportionate to the degree of
requency. Tl1h is referred to as ”ideal ('ondlt'iuns" in dislortlon of the signal wave.
‘"3"’ “q“l*’"‘°“‘ ‘“‘““““ “T? ’°““"“5 “ml is d°"'lg““d “’_ niere are a few quick ways tn check the shape and relialnlity
prnvide intormation about a signal by taking nieasurements . , . .
. . ot the signal you re lncating. Eefure the First mark is placed

wlthln the slgrlal field These measurements Include the

_. . _. . . on the grnund, compare a tevv measurements tn check tor
signal strength nr intensity, directional nr guidance to the top . .

. . . . . _ . consistency. A tew examples wnuld be to lncate the line in firsl
dead center of the signal, onentanon or direction the signal is .
_ . . _ peak mode and then switch to the null niode nr arrnws to see

traveling estimated ainnunt ot curient giving rise tn the signal 1 b Lh d _ th 1 ti “h 1.

and also a distance calculation trom the bottum nt the receiver ‘ ° '“" 9’ 35'“ °“ ° ‘*5 °“ " E ‘"2

tn the center of the signal This intormation helps the locating Another quick way tn make sure your signal is reliable is to
technlcian determine the estimated location, pathway and locate top dead center ui the slgnal and slowly hit the receiver
estimated depth of the line. straight up trom the ground. lt the top dead center reading

A wmenmml EM signal "(giving um the mm“, B begins to dritt to one side or the nther ynurs-ignal is distnrted.

_ lt ynur signal is round, the tnp dead center indication will be
designed to find the exact top dead center nt a pertectly round .
_. . _ at the same horlzontal lncation, no matter how tar away trom

electromagnetic signal. There are many vai-tables that often ‘h I Y 1 d ‘h _ mm h

cause the propnsed signal wave tn distort its shape when the E ‘"9 Y“ 3"’ "“ "5" “ 5° " E ’’“"‘E ““° "" °“

,  .\ll(t1'llt‘]'(]lI](‘l\’\\il\ to lllzlliv
_ ‘ ~‘lll‘(‘ \<Jlll‘~‘],'_‘ll2ll ls‘ l‘t‘ll2ll)l(‘
l ’ ‘ . - rt . , t
‘ Ix to lU(tlT(‘ T()]l(l(‘tl(l (<‘llT(‘l
_ .7, (Fl Tll(‘\‘].‘_’llill illl(l\‘l()\\l\
‘ .; lllTTll(‘l(‘((‘l\(‘] ~ll.ll;lltll]l
' V 5. . _
y ‘ t I, _ I llmll Tllt‘_Q]‘UlIll(l.
‘ ' - ' kl’ trying to determine the reliability nt the depth estiinatinn.
fl _ , , Take a depth measurement at ground level and then litt
“ 5‘ your receiver up about a tont and see it the reading nnw
' "‘O~ _ indlcztes that the line is almut a foot dee er. Annlher valuable
. P
l "' ’ _— ineasurenient provided by ninst receivers is the current
* 1  _ ineasurenient. when ynu detect more than one signal in the
pn V » e - _ - area, check the current reading on each signal. The signal with
' V the hi hest current readln will be the llne uu’re a 1 ln
E S Y PP Y S
the signal on.
A line loealor's mark is an educated guess, and most loealors
know that you are rarely given a second chance tn mark the
.: r-g burled line cnrrectly. while pinpointing the location nt the
- ‘-'  line, it is very impni-tant to measure twice and mark once .
.. _> -. ‘N  ’ Bob Nlghswovlgev 15 tlic Pmslrlrn! and can ofllllllty Tmiiimg Acudmly.
_ - ' __, .,— ,1», -. g -,- ‘ ~ Bob has tum 25 yr/lrs ofrrpeiiemr» In uiryiclrl cf14fllIt_l/ locating and 11/lm—
I . ;_ 3, ‘ " 33‘ i_ v’ ‘ - agc pmciitiim. For questions in Ctmm1Il!t5,3DW um be mzthrd at l)0lJ@
A « " ' "9"?" v -7'’-‘—’‘-' ‘i 7 lttnsnzrrh t-om.
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