Why are some pulse machines motion machines?

[Anonymous]

Hi,
I was wondering what the advantage of the motion or non-motion is?
I thought that by motion a second phase was added so that a VLF could discriminate as well as ground balance at same time?But why have a motion mode on a pulse machine?
Thanks Paul

 

[Anonymous]

Hi Paul,
Motion type PI's are the most popular at the moment, except perhaps for diving use. A motion PI normally has a high pass filter circuit in the receiver that eliminates dc and low frequency signals. The detector then compensates for gradual variations in beach or ground mineralisation and any drift in the electronics due to temperature or battery voltage changes.
Earlier PI's, such as the Goldscan, that had non-motion circuitry used to have a pushbutton to reset the electronics. When moving, for example, form dry sand, to damp sand, to wet sand, you might have to push the button several times as the background conductivity changed. A motion PI deals with this situation automatically, making it much easier to use. The slight downside is that you have to keep the coil moving, otherwise the target will cancel out too. However, pinpointing is not generally a problem.
To give extra control over the motion feature, machines such as the Deepstar, Aquastar and Goldquest have a control which sets the speed of the tuning (SAT). In other words, the low frequency cutoff of the filter is variable.
Eric.

 

[Anonymous]

[No message]