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Iron Bias - What It Is


Chase Goldman

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From the Minelab Equinox Owner's Manual page 52:

Iron Bias (Advanced Setting)

The Iron Bias setting adjusts the likelihood of the detector to identify a target as iron if it presents both ferrous and non-ferrous signals.

All ferrous targets produce a combination of a ferrous and nonferrous response. Large ferrous targets can even present a stronger non-ferrous response. Also, a ferrous target adjacent to a nonferrous target can produce a similar response.

The Iron Bias Setting provides some control over the Target ID response. A lower Iron Bias setting will allow the natural response to dominate which means that the target is more likely to be classified as a non-ferrous target. A higher setting will increase the likelihood that the target is classified as iron.

The Iron Bias setting has a range from 0 to 9.

Iron Bias is only available when the operating frequency is Multi.

Iron Bias adjustment is local; only the current Detect Mode Search Profile will be affected by changes to this Advanced Setting.

In environments with dense iron trash, a higher Iron Bias is recommended in order to mask them. In areas where you do not want to miss any non-ferrous targets amongst iron trash, a lower setting is recommended. This will cause more ferrous targets to be detected and identified as desirable non-ferrous targets.

Adjusting Iron Bias
 1. Use the Settings button to navigate to Recovery Speed in the Settings Menu.
 2. Press and hold the Settings button for 2 seconds. A line will appear beneath the Recovery Speed icon, indicating you have selected the Iron Bias setting, and 'FE' will appear on the Frequency Display.
 3. Press the Minus (–) and Plus (+) buttons to decrease or increase the Iron Bias. Adjustments are automatically saved.
 4. A long press of the Settings button will return you to the Recovery Speed setting.

Click to enlarge...
minelab-equinox-iron-bias-instructions.jpg

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This will be fun to experiment with in those really trashy parks and home sites where iron abounds! Just one more useful tool.

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Im just wondering if this will be a set and forget for MOST beach hunters?   It maybe something to play with if you rotate beaches.   Ive got a couple that have more small flakes of iron that others.   Something to be played with..... ill likely turn it much lower for beach hunting and tweak it.  May well be different near shore vs deeper too.

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On 2/3/2018 at 6:31 AM, dewcon4414 said:

Im just wondering if this will be a set and forget for MOST beach hunters?   It maybe something to play with if you rotate beaches.   Ive got a couple that have more small flakes of iron that others.   Something to be played with..... ill likely turn it much lower for beach hunting and tweak it.  May well be different near shore vs deeper too.

Depends on how much and the type of iron on your beach.  Since beaches vary in that regard, you will probably have to experiment on each beach.  But I suspect, once you have it dialed in for a specific beach, you can probably forget about it. 

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45 minutes ago, Chase Goldman said:

Depends on how much and the type of iron on your beach.  Since beaches vary in that regard, you will probably have to experiment on each beach.  But I suspect, once you have it dialed in for a specific beach, you can probably forget about it. 

 

I am not so sure the iron bias will make a difference or "see" black sand at all. After all it is multi-freq that cuts black sand in conjunction with sensitivity and threshold. Once a detectable target is passed under the coil then iron bias will come into play. Even Minelab's own definition mentions nothing about soils conditions.

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To be clear, I was referring to iron trash infested beaches (many exist, probably not an issue for most beaches though) not black sand. Can't speak for Dew, but he did say "most beach hunters" and I suppose that since most beaches are not iron infested, this setting would not come into play.  It may have some impact on filtering corroded crown caps, though.

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If this setting affects Equinox performance similar to Silencer setting on XP Deus, this setting may very well affect Equinox separating/unmasking performance in around ferrous materials.

And this setting will likely be one where it will be different strokes for different folks.  Detector falsing on iron depemding on setting may happen, but if a user adjusts this setting to get rid of or minimize falsing, doing so could come with risk of missing nonferrous targets.

Could affect depth too in higher mineralized grounds.

All speculation on my part, hopefully in the near future I and others can give some first hand info accounts.

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37 minutes ago, Tnsharpshooter said:

If this setting affects Equinox performance similar to Silencer setting on XP Deus, this setting may very well affect Equinox separating/unmasking performance in around ferrous materials.

And this setting will likely be one where it will be different strokes for different folks.  Detector falsing on iron depemding on setting may happen, but if a user adjusts this setting to get rid of or minimize falsing, doing so could come with risk of missing nonferrous targets.

Could affect depth too in higher mineralized grounds.

All speculation on my part, hopefully in the near future I and others can give some first hand info accounts.

Your second paragraph reads just like the manual description (classic tradeoff parameter - No free lunch).   Can't wait to try this in thick iron and highly mineralized soil.  You are reading my mind.

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But excessive falsing may not be the way to go all the time.  We as humans can get traumatized and our concentration levels will be compromised.  Hence we may miss a find that even sounds good some days.

A detectorist realizing their limitations here with concentration can go a long ways.

Likely one of the many reasons why we can go back to sites and sniff out a find or 2.

New detectorists may be reading here.

Some things  to think about and I will share a little story.

When we go to school or college, which parts of the instruction we receive do we generally remember the best?

We as humans lose interest, get tired after so long sitting.  One reason why breaks are offered in learning institutions.  So new detectorists getting exposed to your detectors,  realize longer training sessions may not up your proficiency as much as you think it does.

More shorter sessions better than fewer longer ones.

Now a story here.  Some here may know I am retired AF.  While I served I had to take a lot of test for job advancement, promotions, etc.

So I was  provided materials in which to study and prepare for the above.

I always tried for the most part to study by chapters.  But what I found out was I after reading and studying a chapter starting from the beginning, the stuff at the end I would not remember as well.  So I would read a chapter backwards paragraph wise.  It helped too.  I even extended this process to whole book or whatever I needed to remember.  So I would even read the entire book backwards (paragraph wise).  This helped too.

Folks can even try this with Equinox instruction manual.

 

 

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There isnt a hugh amount of iron out there compared to say dry sand or even near shore.   So im going to play with a lower setting hoping to pull some stuff near iron.   Ya ill have to play with bottle caps...... but those at least the fairly shallow ones are learned quickly.... and from what i saw will hit or jump around the nickel range.   Some of you may have hunted with a DFX...... they had single digits.  What we did there was disc the highest digit it cut out a good bit of response from wrap around and hot rocks.   I may try that as well just to see if it will allow a lower bias.   Im guess 4 is usable.  This seems to be much like IM on the Sov ...... it was on or off...... now we have the ability to adjust it to our tolerance.

Dew

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