The Minelab Manticore’s Ferrous Limits it's what classifies targets as ferrous or non ferrous, it’s based on the conductive properties of the target. The Ferrous Limits Presets is local and won’t affect the other detect modes. If you save a Custom Ferrous Limits, this can be accessed in the Ferrous Limits setting in all your detect modes..
Ferrous Limits are similar to Iron Bias but gives you a lot more control. It allows you to accept desirable ferrous targets or reject difficult ferrous trash. The Ferrous Limits are disabled in single frequencies, to enable the Ferrous Limits you must change your frequency to Multi IQ+.
In the Ferrous Limits setting, you have two options, Preset and Custom.
On your ID Map you will see your Upper and Lower Ferrous Limits.
Upper Ferrous Limits, this controls the classification of most iron objects like screws and nails. By increasing it, it will drop this line down closer to the center line and classify more targets as iron.
This will result in less iron falsifying but, this will reduce Target Separations performance.
By opening it up and lowering the upper ferrous limits. This will move the line further from the center. This will classify less targets as iron and it will falsify more on iron but increase the Target Separations performance.
The Lower Ferrous Limits deals with flat iron objects like bottle caps and sheet metal. By closing the Lower Limits (moving them closer to the center line, will classify more flat iron objects completely as iron but this may also reduce depth on some deep targets in mineralized ground, particularly low‐mid conductors
Decreasing or opening the Lower Limits (moving them further away from the center line) will classify fewer flat iron objects as iron, but may also improve depth on some deep targets in mineralized ground.
Ferrous Limits audio, in all metal anything within the grey area will have a ferrous tone, anything not in the grey area will have a non ferrous tone.
When you’re not in all metal, targets within in the grey area, you won’t hear the target tone or have a target ID or ferrous indication but you will still see it on the ID map.
The Ferrous Limits Preset is designed to deal with the most common scenarios. In some cases you may want to reject or accept a desirable ferrous target. As an example, here in Canada our modern coins are composed of ferrous steel. Most of Our steel coins appear in the same area in the Upper Ferrous Limits. This can be adjusted. This leads us to creating custom Ferrous Limits.
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RDH Metal Detecting
Relic Dirtyhands