Awesome video and explanation guys, well done. This would be one of the best videos I have seen so far online when it comes to explaining frequency and knowing which one to use. The that technitians need to understand, is that it is not about having one set frequency that you use all the time, it's about looking at your environment and the utility you need to locate and picking one that you feel will be most suitable and then if you find you are having issues, going back and changing the frequency or the way you have connected to the utility and then trying to locate again. It's videos like this that teach and explain why you would choose one frequency over another and why you might have issues with certain frequencies, that each technitian need to watch and learn before they go out and start locating on there own. Keep up the great work guys, regards Ben
I use a Dynatel 2273 locator. It has never been calibrated lol. our fibre multiducts have one 0.5mm tracer wire, the far end is buried so you cannot return earth it! Ducts are 600mm to 2 meters deep. I have mild success using 33khz or 133khz. My job is very frustrating! Reece in New Zealand.
No earth return path makes your job tough. You're correct 33kHz would probably be your best choice. Just be aware of significant bleed off onto other lines. The Radiodetection transmitters allow user to increase voltage output to 90V, which is very helpful to force lower frequencies down resistant lines. Only then you may be able to get away with using 512Hz or 8kHz. RD's 4kHz current direction frequency would be good in this situation.
question here: can we use lower frequencies when searching the path of cable/pipe in induction method ? because sometimes i can't clamp or direct connect the cable/pipe. tq
Induction requires a higher frequency that will "bleed". All frequencies 940Hz and higher will induce. However only the higher frequencies give a good transfer of current into the target line but they won't travel as far. Most people find 33kHz or 65kHz to give the best transfer of current and locate distance.
Locator for 5 years, located everything from gas, power, fiber and catv. This lower frequency obsession is the first thing I tell new locators to forget from training. In a perfect world with brand new lines buried shallow in the ground, low frequencies would work. Try using only 512 on a 50 year old exterior concentric primary that's direct buried and rotting in the ground. Same goes for a phone main that's been spliced and deeper than 3 ft. Locating is an art, not something you can learn in a seminar with PowerPoint. Git gud.
That's why we offer free field training. Frequencies and antenna's are very important when trying to interrupt a bad magnetic field. Take a look at this video, ua-cam.com/video/9Q-uBNHFrA0/v-deo.html ,that shows the higher frequencies return current jumping directly onto the telephone line causing a mislocate. Most of the time mislocates go unnoticed because they aren't near the dig area. Try to stay around 8kHz or lower when locating. Not sure why locates greater than 3 foot are giving you such difficulty. With the right equipment 8kHz will locate over 50ft deep. Can I ask what equipment you're using?
@Subsurface Solutions I believe @Taggert86 is using his anecdotal experience to condemn entire electrical theory. I respect the triangle and really do appreciate these videos you’ve put out. I usually do sonde work resulting in an excavation and often times it gets it gets messy enough where we lose the visual cues we’ve asked for by other utilities. Everything here is grounded with water. It’s so useful to understand all of this information so we don’t cause a strike which causes fines and perhaps even deaths.
I’ve been locating for 5 years as well with locating companies but when stepping into the SUE world and it’s a different ball game, the lower frequency like 480,512,640,870,940 HZ is golden! Locating is an art but you (in general) have to understand the science behind it! So I laugh at your comment and should definitely want to know where you locate and what you use to locate. SMH
Awesome video and explanation guys, well done.
This would be one of the best videos I have seen so far online when it comes to explaining frequency and knowing which one to use.
The that technitians need to understand, is that it is not about having one set frequency that you use all the time, it's about looking at your environment and the utility you need to locate and picking one that you feel will be most suitable and then if you find you are having issues, going back and changing the frequency or the way you have connected to the utility and then trying to locate again.
It's videos like this that teach and explain why you would choose one frequency over another and why you might have issues with certain frequencies, that each technitian need to watch and learn before they go out and start locating on there own.
Keep up the great work guys, regards Ben
I've struck Gold!!
Tracer wires do not need to be bonded on either end to perform locates. You do however need to close that signal with your own ground.
Agreed, but grounding the far end gives it an 'off ramp' to direct it what way to go.
I use a Dynatel 2273 locator. It has never been calibrated lol. our fibre multiducts have one 0.5mm tracer wire, the far end is buried so you cannot return earth it! Ducts are 600mm to 2 meters deep. I have mild success using 33khz or 133khz. My job is very frustrating! Reece in New Zealand.
No earth return path makes your job tough. You're correct 33kHz would probably be your best choice. Just be aware of significant bleed off onto other lines. The Radiodetection transmitters allow user to increase voltage output to 90V, which is very helpful to force lower frequencies down resistant lines. Only then you may be able to get away with using 512Hz or 8kHz. RD's 4kHz current direction frequency would be good in this situation.
How can take 2 m?
question here:
can we use lower frequencies when searching the path of cable/pipe in induction method ? because sometimes i can't clamp or direct connect the cable/pipe. tq
Inducing is best done on higher frequencies like 65 or 83.
Induction requires a higher frequency that will "bleed". All frequencies 940Hz and higher will induce. However only the higher frequencies give a good transfer of current into the target line but they won't travel as far. Most people find 33kHz or 65kHz to give the best transfer of current and locate distance.
Locator for 5 years, located everything from gas, power, fiber and catv. This lower frequency obsession is the first thing I tell new locators to forget from training. In a perfect world with brand new lines buried shallow in the ground, low frequencies would work. Try using only 512 on a 50 year old exterior concentric primary that's direct buried and rotting in the ground. Same goes for a phone main that's been spliced and deeper than 3 ft. Locating is an art, not something you can learn in a seminar with PowerPoint. Git gud.
That's why we offer free field training. Frequencies and antenna's are very important when trying to interrupt a bad magnetic field. Take a look at this video, ua-cam.com/video/9Q-uBNHFrA0/v-deo.html ,that shows the higher frequencies return current jumping directly onto the telephone line causing a mislocate. Most of the time mislocates go unnoticed because they aren't near the dig area. Try to stay around 8kHz or lower when locating.
Not sure why locates greater than 3 foot are giving you such difficulty. With the right equipment 8kHz will locate over 50ft deep. Can I ask what equipment you're using?
@Subsurface Solutions I believe @Taggert86 is using his anecdotal experience to condemn entire electrical theory. I respect the triangle and really do appreciate these videos you’ve put out. I usually do sonde work resulting in an excavation and often times it gets it gets messy enough where we lose the visual cues we’ve asked for by other utilities. Everything here is grounded with water. It’s so useful to understand all of this information so we don’t cause a strike which causes fines and perhaps even deaths.
@@pleasureincontempt3645 Anecdotal experience? Is it anecdotal or is it experience? Good job resurrecting a 3 year dead comment, nerd!
I’ve been locating for 5 years as well with locating companies but when stepping into the SUE world and it’s a different ball game, the lower frequency like 480,512,640,870,940 HZ is golden! Locating is an art but you (in general) have to understand the science behind it! So I laugh at your comment and should definitely want to know where you locate and what you use to locate. SMH