AM or OPEN DISC PATTERN

[ronhob]

I was playing around a bit with the 705 today, and realized that in AM mode, the 705 gets more sporadic than in a pattern mode with nothing discriminated. Is there a reason? It seems to work the same, just more unstable sounding and the numbers repeatedly jump everywhere. I was under the assumption that the two acted identically.

 

[Old Longhair]

Well, there is a reason....or two.
First, it's different circuitry. The Disc pattern even if open is passing the signal through filters that can turn each bin segment off, which by itself defines each value w/o it bleeding over into the adjacent bin as easily.
And I may be wrong, but I believe that the Target Stability option may only work in Disc mode, and even if not, it does "clean up" the signal enough to make it easier for the machine to place a specific value to it.

Maybe we can get Randy to weigh in with the definitive explanation.

 

[Digger]

All Metal detects anything metal. Zero Discrimination uses the parameters established by the notch segments to categorize each target within one of those notch segments. Recognize that notch segments were established with specific ferrous and non-ferrous properties in mind. On the 705, they called the "most ferrous" notch -8. And they call the most conductive notch +48. In reality, there could be metallic properties that are more ferrous than -8, or more conductive than +48. If you were using Zero Discrimination, you wouldn't detect them. But in All Metal, you would because All Metal is not restricted by the programming used to set the parameters of the notches.
How can we make that work in our best interest......Deeply buried iron is most generally the -8 notch segment. In All Metal, those same deeply buried pieces of iron will be recognized as metal, and generally bounce between -8 and +48, giving that occassional burst of high tone, blended in with the low tones. It may still bounce a bit between the lowest ferrous and the highest non-ferrous notch when using zero discrimination. But generally, zero discrimination offers a more consistent -8 TID on bits of iron than it does in the All Metal mode, without having to reject notch segment 48 to minimize the wrap around. JMHO HH Randy

 

[Woodstock]

Great information Digger ! And this answer explains it perfectly . Thanks for the info ! HH, Woodstock

All Metal detects anything metal. Zero Discrimination uses the parameters established by the notch segments to categorize each target within one of those notch segments. Recognize that notch segments were established with specific ferrous and non-ferrous properties in mind. On the 705, they called the "most ferrous" notch -8. And they call the most conductive notch +48. In reality, there could be metallic properties that are more ferrous than -8, or more conductive than +48. If you were using Zero Discrimination, you wouldn't detect them. But in All Metal, you would because All Metal is not restricted by the programming used to set the parameters of the notches.
How can we make that work in our best interest......Deeply buried iron is most generally the -8 notch segment. In All Metal, those same deeply buried pieces of iron will be recognized as metal, and generally bounce between -8 and +48, giving that occassional burst of high tone, blended in with the low tones. It may still bounce a bit between the lowest ferrous and the highest non-ferrous notch when using zero discrimination. But generally, zero discrimination offers a more consistent -8 TID on bits of iron than it does in the All Metal mode, without having to reject notch segment 48 to minimize the wrap around. JMHO HH Randy

 

[fdl]

Digger & Old Longhair.....thanks also for that explanation between the 2 settings. That clears up another question I had which makes it that much easier to use my 705.

 

[ronhob]

Thanks Randy! Thanks Old Longhair!