TDR question?

Discussion in 'Irrigation' started by 1idejim, Apr 27, 2012.

  1. gar

    gar LawnSite Member
    Posts: 11

    Jim,

    No, I haven't used it yet b/c it just arrived. I am trying to get up and running w/ it. I have been using the 521 Locator and look forward to using this new tool.....
     
  2. 1idejim

    1idejim LawnSite Fanatic
    Posts: 9,316

    measure your extension cords by attaching to the male prongs and adjvsting the VOP to match the length. try a few and get used to making good connections. if you have a system at home trace the wire path and measure the distance to all valves. since the path has been traced and flagged you can pace the distance to the values for estimating purposes.

    pm me when you can and i will send you more info
    Posted via Mobile Device
     
  3. gar

    gar LawnSite Member
    Posts: 11

    Jim, I don't have your email. I can only pm you after so many posts, I guess. Obviously, I am new to this site.
     
  4. 1idejim

    1idejim LawnSite Fanatic
    Posts: 9,316

    5 more posts or leave your contact info as a visitor to my page.

    left click my user name and go to view profile, leave your email or phone number and i'll contact you :)
     
  5. gar

    gar LawnSite Member
    Posts: 11

    I will have to experiment a bit w/ the 3271 and I will report back.

    thanks
     
  6. 1idejim

    1idejim LawnSite Fanatic
    Posts: 9,316

    use an extension cord to measure the VOP by raising or lowering the VOP till the correct length of the cord is displayed.

    do the same with romex and 14 ga and/or multi strand irrigation wire, i have found that 50 -55% usually gets me in the ballpark.

    with dog fence you can measure the loop by connecting the leads to opposite ends.
     
  7. gar

    gar LawnSite Member
    Posts: 11

    great idea, will try it..... been so busy just have to make the time.
     
  8. gar

    gar LawnSite Member
    Posts: 11

    Jim, Well, I finally got around to do a test w/ the 3271. I found that 14awg worked accurately set at 85% and 18awg worked accurately set at 65%.... I wonder if each 3271 unit out there might be a little different from each other, meaning that each has to be calibrated. Maybe there isn't a "one size fits all" setting. I recall you saying you found 14awg worked well set at 50-55%. Maybe each user has to find own sweet spot for his unit....

    for what its worth....
     
  9. 1idejim

    1idejim LawnSite Fanatic
    Posts: 9,316

    i loaned a triplett to a good friend in Texas a while back and he said that something like 18% was working in his area.

    the units aren't different, the conditions are.

    i think the reason that i am comfortable at 50 - 55% is that i am looking for something else and not concerned with accurate distances due to the way that i perform my locating.

    i was talking with a fellow in Idaho last week, he was using a snapshot and having some funky findings, he called and we talked for about 30 mins. i guess he's doing OK finding faults on 3 ph.480vlts,

    he chases faults all day every day. sweet gig :)

    2 more posts and pm me, we can talk and maybe learn something from one another.:waving:
     
  10. gar

    gar LawnSite Member
    Posts: 11

    Well, I guess it sounds like users get different readings after all.... hmmm electricity is a funny element.
     

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