18\/ How to Run \u201c10 kHz\u201d as a Cap \/ Iron Identifier<\/p>\n

A lower frequency like \u201c10 kHz\u201d is what can be called a \u201cplodder.\u201d It responds slowly, makes sure its reporting accurately and only shows a couple of numbers to describe what it sees. When you run \u201c10 kHz,\u201d make sure to give it the time it needs to do the task. Switch over, wait for the threshold to return and make a slow, even coil pass. Just as with \u201cMulti\u201d the first numbers that appear may be cap or gold-range indications–in the teens. However, when you go to the cross sweep (or even a slight angle) the ground becomes apparent in the forum of a \u201d20 plus\u201d reading. This change will be a lot more definite than with \u201cMulti.\u201d So go slow to let the slower frequency process, use the cross sweep and watch for the \u201cwild\u201d high number indicating a cap or iron. \u201c10 kHz\u201d produces a more defined, more \u201cgeneral\u201d meter response. This response takes into account more of the ground\u2019s signal–making \u201c10 kHz\u201d a great cap identifier. (This is also a great illustration of the dichotomy between what the high and low frequencies actually do).<\/p>\n

The idea though is to work on your coil and meter recognition skills so that having to make the change-over is a last resort for only those caps that display a very narrow band of numbers in \u201cMulti.\u201d These are in the minority. I especially go to \u201c10 kHz\u201d where the indication shows \u201c14\u201d–again–a good gold number.<\/p>\n

(Note: If you are using the 800, in \u201c5 Tone\u201d a high \u201cTone Break\u201d of around \u201c19\u201d or \u201c20\u201d will produce an intermittent high tone on caps with this test.<\/p>\n

Another interesting lesson to be observed when running \u201c10 kHz\u201d is that if you make multiple passes on a target sometimes the slowed response speed will cause the meter response to \u201cdouble up\u201d–that is it gives a \u201ccumulative\u201d high number. This is something to watch for in that a response can be falsely \u201cID\u2019ed\u201d as higher than it is–in this case a worse signal. Referring back to our \u201ccoil control pass types\u201d above, this kind of a response comes from making \u201ckeep in\u201d passes–instead of letting the target leave the detection field each swing (so as to \u201creset\u201d the meter). Both have value in identifying responses but it\u2019s good to be aware of the difference.<\/p>\n

It\u2019s important to recognize the parallels between this machine and the CTX. With the CTX this \u201cgrounded\u201d number comes in the form of a \u201c1\u201d or \u201c30\u201d \u201coff screen\u201d response–indicating iron or steel (non-constancy). I\u2019ve heard these referred to as \u201ccross-feeds\u201d In that they initially sound good as the two parts of the response \u201cconnect\u201d on the first pass–but this electrical \u201cjoin\u201d is then rapidly processed out with subsequent coil passes.<\/p>\n

With the Equinox these indications are more centered on the meter–“10\u201d for rusted caps or \u201c20\u201d plus for steel caps. It\u2019s more like where you have a coin next to iron–pulling the response down (or up towards the \u201cwrap\u201d zone). With an analog detector–either of these (CTX or Equinox \u201coutlying\u201d numbers) would be the low tone (or \u201cnulls)\u201d of iron mixed in to the audio response, or a high \u201csound off\u201d or \u201cfalse.\u201d<\/p>\n

From: “The Minelab Equinox: An Advanced Guide” (2018)<\/p>\n

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