WHITES TDI PRO CURRENT CONSUMPTION

[daverave]

why does the whites tdi pro draw about 500ma...it seems rather a lot of current to use in a detector designed for small gold items.

 

[billybob]

All PI detectors use high current, I was curious and looked up Minelab GPX current consumption probably similar to TDI

 

[Reg]

Generally, the TDI draws about 600ma and the TDI SL draws about 500 ma. Both are considered high powered PI's.. The ability to detect small gold is related more to the minimal delay and not necessarily the power consumption, although power consumption does have a direct influence. Minelab PI's I have measured were about 700+ ma current draw.

Eric made low powered PI's called the Beachscan and the Goldquest to name a couple that only pulled about 200 to 300 ma. These were also built for hunting small gold but had no ground balance feature.

Take a low powered device and the depth will be respectable. However, increase the current draw by increasing the pulse current and generally, the depth will increase accordingly. Unfortunately, the depth increase as the pulse current goes up is not that dramatic. In fact it is something like doubling the current to add an inch or so to a dime size object.

Quite often it is easier to increase the coil size to increase the depth. However, the depth increase will depend upon the depth of detection of the smaller coil and the size difference, providing the size difference doesn't exceed the maximum size potential of a coil. In simple terms, if a target can only be detected to a depth half the diameter of the present coil then that is the maximum size coil should be used.

In other words, if a person is using a 12" coil and the object he is detecting is 6" deep in maximum depth, then increasing the size of the coil will cause a depth loss.and not a depth gain.

The point being, trying to figure out how small or how deep a target might be detected if things change becomes more complicated that most people realize.

Reg

 

[billybob]

Thanks Reg, off topic if a new TDI Pro is coming out could you have a pinpoint toggle added, or some kind of non motion all metal pinpoint mode

 

[dr.jare]

In other words, if a person is using a 12" coil and the object he is detecting is 6" deep in maximum depth, then increasing the size of the coil will cause a depth loss.and not a depth gain.

Nicely explained... but did not say where the size of the "object" (target) is done... probably not of coin 2.5cm (1")...