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How deep can a good metal detector be expected
to find coins?
This question is much easier to answer today due to the fact that virtually
all of the detectors made today are of the “motion” or VLF
Discriminator type. Most of them come with a searchcoil of around 8
inches diameter, since this size has been determined by most everyone
to be optimal for coin hunting in areas with moderate amounts of trash.
Using the proper sweep speeds for the detector type will also affect
depth, but the following figures are achievable for a properly used
detector.
| Target size |
Depth |
| Dime to nickel: |
4 to 8 inches |
| Quarter to half dollar: |
6 to 12 inches |
| Dollar to fruit jar lid: |
8 to 16 inches |
Other conditions affect how deep your detector goes,
but those same conditions will also affect all other detector depth.
Becoming familiar with your detector and using it at the proper sweep
speed are the two most important things for you to do. Back
to Top
Can any one metal detector really “do it all”?
Some of the better “all-purpose” detectors do a pretty good
job at most hunting chores, but there are some specialized types of
hunting where they generally are not as effective as models designed
for that particular purpose. Waterproof detectors and nugget machines
are two types that are specialized and pretty much not compatible with
all-purpose detectors. Diving and wading takes a detector which can
handle being wet. Nugget hunting, for all practical purposes, means
using a VLF All Metal detector with extreme electronic gain.
All of the manufacturers make several different types of detectors to
cover all hunting applications. Their literature will clarify which
type of hunting each of their metal detectors were designed for. If
it does not say, it should be a “general purpose” type. Back
to Top
Are detectors with a lot of knobs better than those
with just a few knobs?
Regardless of a metal detector’s purpose, it will fall into one
of two different classifications: a) “turn-on-and-go” or b)
“do-it-yourself.” Turn-on-and-go detectors have either a factory
preset ground adjust or automatic ground adjust and do not require any
adjustments by the operator for mineral conditions. The electronic circuitry
takes care of eliminating any mineral effects.
The do-it-yourself types generally have a multi-turn Ground Adjust control,
which must be properly set by the operator. This type is generally capable
of just a little more depth than the turn-on-and-go types if it is set
properly, but can yield much worse results if it isn’t adjusted
properly. Both types can be very effective detectors. Back
to Top
What kind of detector should be used for gold, relic
or coin hunting?
Gold, or nugget hunting, is best done with a special nugget detector.
Since there is an awful lot more tiny pieces of gold than big ones,
most nugget machines have an extreme amount of electronic gain to find
the really tiny pieces close to the coil. This extra gain doesn’t
translate into much added depth for coin-sized objects, however. Most
nugget detectors don’t have any Discriminate modes of operation,
since to find gold almost requires you to search in the All Metal mode.
Nugget hunting is possible with a good all-purpose detector, but you
won’t find the little tiny pieces that a nugget detector will find.
An all-purpose detector is all that is required for relic or coin hunting,
although a larger coil may be desirable for relic hunting. For coins,
there are other features which may be desired, such as Discrimination,
Notch Discrimination, Target ID, Coin Depth, etc. Obviously, for coin
hunting, a motion Discriminate mode is necessary since you don’t
want to dig all of the iron bits you are likely to find. All of the
other options are simply “at your discretion.” Back
to Top
Why are there so many types of searchcoils?
The two most popular styles of coils today are the Concentric and the
Widescan. The Concentric is a much better discriminating coil than a
Widescan, but it is much more affected by the ground you are hunting
on. It generates a much more uniform field than a Widescan and is the
type generally used on most detectors built today.
The Widescan coil, though, can be a much superior coil in areas of high
mineral concentrations, since it is less affected by the ground. While
it lacks a little bit in finding the absolutely tiniest bits of gold,
Tesoro uses this style as standard on its Lobo and Diablo nugget hunters.
Both coil configurations are built by Tesoro in both
round and elliptical versions for its all-purpose line of detectors
as well as for its nugget hunters. Since nugget coils are inoperable
on all-purpose detectors and vice versa, each type coil uses a different
connector. The nugget type coils use a 4-pin connector, while the all-purpose
types use a 5-pin connector. Back to Top
Which coil size is best?
Most nugget hunters use either the 10 inch Widescan (standard) coil
or the optional 7 inch Concentric coil. We make an 11 inch round Widescan
coil for finding coin-sized targets a little deeper.
For the all-purpose detectors, the standard coil that the detector comes
equipped with is usually the optimal size for most hunting. In extremely
trashy areas, a smaller coil (4” or 7”) usually will bring
better results. The reason for this is that even though the smaller
coil has less depth for coin-sized targets, good targets will not be
masked by bad targets lying next to or over them.
And if you get into a relatively clean or trash-free
area, a larger coil (10.5” or 11”) will usually yield
better depth and a wider area of coverage when trash masking of good
targets isn’t likely to be a problem. Back
to Top
How much discrimination should I use?
If you are serious about finding gold rings and gold coins use as little
discrimination as possible. I recommend setting the discrimination level
to just below nickels. All gold items are lost at about the pulltab
level of discrimination, so by eliminating pulltabs, you are also losing
all of these gold targets. Even if you use a Notch Discriminator to
eliminate pulltabs, you will lose all of the gold targets which have
the same phase response as the pulltabs.
A truly serious hunter, and one who has been successful over the years,
will have dug many, many pulltabs. But that is why he has also found
most of his gold targets. I know of several excellent hunters who still
hunt in All Metal mode. While they’re digging a lot of trash, they
are also finding some incredible targets. With today’s motion machines,
it is pretty easy to get rid of most of the iron objects, but those
iron objects could be hiding good targets below them. Back
to Top
What is the purpose of Notch Discrimination?
Notch Discrimination can be used to either reject a narrow band of targets
(notch reject) or to respond only to a narrow band of targets (notch
accept). It is usually used to reject pulltabs while still finding nickels
and the gold rings which do not have the same phase response as pulltabs.
The Notch Level control generates a “window signal,” whose
width is set by a small control on the PC board. This “notch window”
can be moved up and down the discriminate range until it properly covers
the desired range of target response.
If the detector is being used to eliminate the response to pulltabs,
you need to remember that any good target with phase response which
falls within the window will also be eliminated. Such targets consist
mainly of gold items and rings.
The notch accept feature can be used to tune the detector
to a particular type of item, such as a type of ring. The detector then
will only find items which fall within the narrow notch window. Back
to Top
How do I adjust my Sensitivity control to get maximum
depth?
The Sensitivity control of your detector can affect just the All Metal
mode, just the Discriminate mode, or both modes. Its purpose is to decrease
the electronic gain of the stage it affects enough to make the detector
more usable. If you are uncertain which modes of your detector are affected
by the Sensitivity control, just tune the detector according to your
operator’s manual and wave a good target over the coil. If you
can detect it farther away with the Sensitivity control at maximum than
you can at minimum, the control affects that mode.
Regardless of which mode you are using, the Sensitivity
control should be high enough to allow you to use the detector without
having many false signals or sputtering noises. When these signals are
present, it makes hearing the weak responses of good deep targets difficult.
Back to Top
What is Target ID and how does it work?
If you have any kind of discriminating metal detector, you have a “do-it-yourself"
ID unit. By increasing the discriminate level control until the target
just disappears, you can tell what the target is. A Target ID detector
does all of this automatically and very rapidly as you swing the coil
over each target. Basically, the electronic circuitry measures the phase
angle of the target as the signal happens. It generally takes only one
pass over the target to get accurate ID, although the earliest types
took several swings, which is why they were known as “pump up”
ID detectors.
Target ID is a very accurate measure of the target’s
phase response, but unfortunately many targets have identical, or nearly
so, target responses. That is why you will lose a lot of good gold rings
if you believe your ID is correct each time it tells you the target
is a pulltab. The ID is just another form of information that you, the
operator, must interpret before deciding whether you will dig the target.
Back to Top
Is manual ground adjust better than “automatic”
or “preset”?
Typically, you can get just a little bit more depth from your detector
by properly adjusting the Ground Control of a manual type detector than
you could expect from a factory set or “automatic” type of
turn-on-and-go detector. The preset machines will always give good performance
no matter what type soil you are hunting in. Adjusting the manual machine
may increase the detection depth a small bit, if it is done properly,
but if it is not done properly, the results may be horrendous. I feel
that for the average detector user, a preset or automatic detector's
performance is superior to the results which may be obtained with an
improperly set manual machine. Back to Top
Are battery test readings accurate?
Only if the battery test is done while the batteries are delivering
the proper amount of current to a load. Some “drug store”
battery testers, as well as a good VOM, may yield completely erroneous
results due to the fact the batteries are not delivering current during
the test. An audio battery test is probably the best test of a battery,
since the audio circuitry loads the battery to the detector's maximum
amount of power delivered while the test takes place. Also, since batteries
can tend to rejuvenate some of their performance after a long rest,
it is best to test the batteries after they have been used for at least
ten minutes. Back to Top
How can I judge whether I should buy NiCads or
Alkaline batteries for my metal detector?
Carbon Zinc and Alkaline batteries are the two types most readily available,
and their cost should be a lot closer today than several years ago.
To judge for yourself how much they cost, use a set of each type, keeping
track of the number of hours of use you get from each type. Divide the
cost of the set of batteries by the number of hours of use they provided.
This will tell you which offers the best performance in your detector.
NiCads are available in almost all battery styles today
and offer a much better price/performance ratio if you use at least
one or two sets of batteries per month. Using less than one or two sets
means that you will not recover your initial investment as rapidly.
NiCads can be very noisy in some detectors, and also
have a “memory” characteristic if they are not fully discharged
each time they are used. I prefer Alkalines, since they don’t exhibit
any of these characteristics.
Today, there are several other rechargeable types which
may be worth looking at as well. One type is the rechargeable Alkaline,
which requires its own special charger. The Nickel Metal Hydride and
the Lithium types are also available, but their cost is probably much
higher. The Lithium battery offers a greatly extended shelf life versus
normal batteries. Back to Top
What is the best way to pinpoint a target?
Instruction manuals usually show you how to pinpoint by “X-ing”
the target. This can be done by using a side-to-side sweep and a front-to-back
sweep or approaching the target from several angles. As each sweep is
completed, note the spot where the signal is strongest. Dig where the
imaginary lines cross. Back to Top
How much will using headphones increase battery
life?
The current necessary to drive a set of headphones is considerably smaller
than that required to drive the low impedance speaker. The speakers
in most metal detectors are of 8 or 16 ohms impedance, while most detectors
use a resistor of approximately 100 to 200 ohms to limit the sound output
in the headphones. Using the numbers quoted, a set of headphones should
result in an increase of approximately 2 to 3 times the operating life.
Since the electronic circuitry is always operating, even though the
detector may not be making noise, the savings is not as big as the numbers
would indicate. Back to Top
Are there any good places left to hunt?
There are an awful lot of areas that seemingly have been “hunted
to death,” but if a person is patient, there still are probably
some nice targets left almost everywhere. Spending some time doing a
bit of research can turn up places which may never have been touched.
Beaches are well worth trying, especially after a storm churns them
over.
There are a number of good books written by various
authors about finding the unworked spots. Your metal detector dealer
probably sells at least one of them.
One thing worth remembering is that nobody gets it
all. Just because an area has been hunted a time or three doesn’t
mean that there is nothing left. Back to
Top
What is the difference between 2-filter and 4-filter
metal detectors?
The first Motion-based discriminators were of the so-called 4-filter
type. These detectors had to be swung almost as fast as a golf club
to get maximum depth. The newer so-called 2-filter types do not need
to be swung nearly as fast for maximum depth.
The names of these detectors are a misnomer, since
they both generally have the same number of filters. Basically, the
more modern slow sweep units generally use a filter consisting of a
2-pole configuration. The older types used a configuration more in line
with a 4-pole filter. Since the average detectorist doesn’t understand
the difference between 2 poles or 4 poles, the name was changed to 2-filter
and 4-filter. I don’t know why because the average detectorist
still doesn’t know the difference between 2 filters or 4 filters,
does he?
At any rate, the 4-pole filter will have a much sharper
cutoff rate between signals that get through and signals that don’t.
But the cutoff rate isn’t really that important, and since 2-pole
filters are easier to build, they seem to have won out. Back
to Top
My VLF metal detector sometimes detects rocks and
tree roots. Is this normal?
A lot of this kind of performance may be normal, but some of it may
not. Basically, the detection of rocks can be either due to your detector’s
Ground Adjust not being set correctly for the detector to ignore the
typical “hot rock” or due to the fact that the rock you just
found is truly a positive reading mineral sample. Hot rocks are iron
ores or magnetites, which are “negative” with respect to normal
ground signals. Their intensities can vary considerably, which makes
setting a detector to get rid of all of them a little tricky.
The discrimination circuitry of a motion detector uses
two channels of filtered signals to come up with a composite disc signal.
The normal Discriminate signal is filtered to get rid of ground effects,
but the resultant signal has lost its DC reference and is now an AC
signal. The only way to tell if it is good or bad is to filter the All
Metal signal in identical circuits and compare its resultant to that
of the discriminator. If both signals are the same, the discriminate
target must be good, because an All Metal signal is “inherently
good.” If they are different, the Discriminate signal must be “bad.”
Earlier motion detectors (the 4-filter type), usually beeped at hot
rocks, but switching to All Metal yielded a “null” response.
Since the hot rock was negative in All Metal and in Discriminate, both
signals were the same, and the detector said “good target,”
even though it was really bad. Now, most manufacturers set the ground
adjust of the detector so that the filtered All Metal signal responds
in a positive fashion to hot rocks. Therefore, the signals are different
in the composite so the detector doesn’t beep at a negative hot
rock.
Minerals come in many different forms and some of them
are detectable. Tree roots can also absorb various chemicals and end
up being electrically conductive. Sometimes, all you can do is grin
and bear it. Back to Top
VLF metal detectors are very sensitive to iron.
Can iron be rejected while gold nuggets are still found?
Iron can be rejected by a VLF discriminator while still having the ability
to detect gold if the discriminate level is set very low. Doing this,
however, means that tiny pieces of gold may be lost due to the fact
that the signals they cause are below the reference level of the electronic
detection circuitry of the detector. The best way to hunt for gold is
still in the All Metal mode, preferably with a detector designed with
the extremely high gain necessary to detect the little pieces. Back
to Top
How should the Sensitivity control be set to get
maximum depth?
As high as possible while still being able to discern the feeble “deep
target” signals from the noise or sputtering signals. Back
to Top
Will metered detectors find coins deeper than non-metered
ones?
Adding a meter to any metal detector will generally not enhance its
ability to find targets deeper than before. It takes some kind of circuitry
to drive the meter, and if that circuitry has more gain than that which
drives the speaker, it may be possible to detect deeper with the meter,
but virtually all manufacturers realize that if they can get deeper
performance, they will also add the extra gain to the audio stage as
well. Back to Top
My friend uses an old TR discriminator and something
he calls “reverse discrimination,” and he usually finds more
targets than I do. What is he doing?
While it may be very difficult to find a target using an older TR discriminator
in the Discriminate mode, it is very easy to find any target while using
the All Metal mode. Reverse discrimination means that you search in
All Metal mode until you find a target. Then, since you know where the
target is, you place the searchcoil directly over it and switch the
detector to the Discriminate mode. Then moving the coil off of the target
by sliding it about one or two inches in any direction and listening
for the sound change will tell you the type of target—good or bad.
The word reverse is used because if the target is good, the detector
will go silent or “null” as it is moved away from the target.
If the target is a bad one, the detector will beep as the coil is moved
away from the target. This technique can work very effectively for someone
who is very patient, but with the technology we have today, it seems
to me to be a waste of time. Back to Top
How can I overcome interference from other detectors
when I am at a treasure hunt?
Interference is caused by two detectors of the same search frequency
operating very near each other. The nearer the two frequencies are to
each other, the farther away the detectors will “crosstalk.”
Crystal controlled detectors can be very bad for this interference problem,
since the crystals are very accurate. Unless you can get a “frequency
shifter box” for your detector, you can only get further away from
the offending machine. Many metal detectors are manufactured today by
various companies using essentially the same frequencies. Tesoro doesn’t
use the same frequencies as other companies and doesn’t use crystals
for this very reason. Back to Top
Are “audio enhancers” really any good?
They operate by amplifying weak signals and attenuating strong signals.
Therefore, they tend to make all signals sound alike. They can be very
helpful when your hunting mode is TR Discriminate, All Metal, or if
your detector has an “audio threshold.” On “Silent Search”
detectors, they’re not quite as effective. Although one thing they
do on silent detectors is limit the sound output in your headphones
when you hit a piece of surface trash. This can add to your comfort
if you hunt for extended periods of time. Back
to Top
Explain “Ground Cancelling” so that I
can understand what it is and how to adjust my detector to the right
point.
Think of Ground Cancelling as being exactly the same thing as Discrimination.
If your Ground Control is set too low (CCW), the detector will “reject”
the ground by going silent as the coil approaches the ground. If the
Ground Control is set too high (CW), the detector will “find”
the ground by beeping as the coil approaches the ground. What you want
to do is to set the Ground Control so that the detector remains neutral
to the ground or doesn’t see the ground at all. By setting the
detector’s operating point where it doesn’t see the ground,
it will detect as deep in the ground as it will in air.
This is accomplished by tuning the detector to threshold
while holding the coil in the air. Then lower the coil to the ground
and pay attention to what the threshold does as the coil approaches
the ground. If the threshold goes away, the Ground Control needs to
be turned in the clockwise direction. If it gets very loud, the Ground
Control needs to be turned in the counterclockwise direction. After
adjusting the Ground Control, you raise the coil, retune to threshold,
and do the same thing over again. When you get it right, the sound will
change very little as you lower the coil. Back
to Top
My detector detects large deep nails and rusty
items even when set to reject pulltabs. Is this normal for my detector
type?
Unfortunately, most motion detectors can be fooled by large rusty items,
especially if those items are circular. Large rusty iron washers are
tough for a motion detector to reject, as well as steel bottle caps.
Sweeping the detector faster will help a lot on the steel bottle caps
and will help some on the large iron washers. Fortunately, large iron
pieces seem to be much “broader” sounding targets in the All
Metal mode than good targets which are not magnetic. Back
to Top
Does the audio tone (frequency) affect the depth
of detection? I seem to find deeper objects with a detector with a lower
tone.
The frequency or audio “tone” doesn’t have anything to
do with the depth capability of your detector, but your ear may be much
more capable of hearing the lower tones. A lower tone may be more audible
than a higher tone with several times the amplitude. The reverse could
also be true. Back to Top
How much effect does the moisture of the soil have
to do with detection depth?
For a lot of metallic targets, lying in moist soil will cause corrosion,
whereby some of the metal will leach out into the soil causing the target
to appear much larger than it really is. When the soil dries out, the
corrosion may not affect the detector, which makes the target look like
its normal size. Gold doesn’t corrode in the ground, and silver
doesn’t corrode nearly as much as copper, brass and bronze. Iron
and steel, of course, rust in moist ground and can cause some really
horrendous false signals. Back to Top
When building a Target ID detector, is depth sacrificed
for accurate Target ID?
Virtually all of the Target ID detectors made can find targets much
deeper than they can identify them. Discrimination only requires one
reference signal, which yields a positive signal for good targets and
a negative one for bad targets. To identify the target requires some
very special and complex electronic circuitry, which doesn’t have
the ability to reach the same depth as a simple discriminator. If manufacturers
limited the depth of their ID machines to the depth of the indentifier
circuit, they would sell a lot fewer of them. Back
to Top
Are the “super” or “hot” coils
that are advertised any good? Why don’t the detector manufacturers
make them?
If you look at the ads for those “super coils,” you will see
that they are usually one inch greater in diameter than the standard
coil offered with the detector that they fit. Being one inch larger
means that they will have marginally better depth for the typical targets.
All manufacturers make extra-sized coils for their detectors. If your
detector, for example, came with an 8-inch coil, why buy a 9-inch “super
coil,” if you can get a 10-inch from the detector’s manufacturer?
The manufacturer of the detector knows a lot more about making coils
for his detectors than the guys who build the “super coils”
and they generally sell them for less money. Back
to Top
When hunting rings, would I find
more of them and dig less trash by using the “notch accept”
on my detector?
Using the “notch accept” feature would probably mean digging
a lot less trash, but you would more than likely also dig a lot fewer
rings. Rings cover an extremely wide range of discriminate levels, and
if you know the proper level for a PARTICULAR ring you want to find,
this can be a good thing. If you just want to dig ANY rings, it is best
to not use any notch feature, since many rings are found right in the
same discriminate level window as most common pulltabs. Back
to Top
How should I adjust my detector’s discrimination
level to get maximum depth?
To get maximum depth from your detector, the discriminate level should
be set as low as possible. As a target approaches the set discriminate
level, its response drops off rapidly until it becomes negative or rejected.
The closer the disc level signal gets to the cutoff or rejection point
of the target, the smaller the signal received from the target. To get
the absolute best depth from your detector if you want to reject pulltabs,
set the disc level control to the point where you get a broken signal
from the tabs, rather than no signal at all. This will give you some
additional signal on all of the good targets that are left. Back
to Top
Is a crystal controlled detector more stable and
better than one which is not crystal controlled?
It may be more stable, all right, at least from the standpoint that
its frequency will not shift. But since a crystal is much more accurate
than LC networks, you have a much greater chance of crosstalk with other
machines of the same brand or model. A LC network, since there are greater
errors in frequency, will have a lot less tendency to crosstalk. And
since changing the frequency by 10% doesn’t yield any difference
at all to the rest of the circuit, it seems like an LC network unit
would be more beneficial. Tesoro builds its detectors using four different
frequencies and utilizes LC networks to help you avoid crosstalk with
other Tesoro detectors. Back to Top
How much better is a $1,000 detector versus a $250
detector and in what ways?
Typically the $250 detector will have the same depth capability as the
$1000 detector, but it will not have all of the features of its more
expensive sibling. It probably won’t have a meter, nor depth measuring
ability, notch capability, or target ID.
It probably won’t have surface blanking, multiple
discriminate levels, or any of the other assorted bells and whistles
that can raise the cost of the basic metal detector. But unless you
want those features and understand that you will consume a lot more
batteries by powering them, why pay for them. Some manufacturers may
put less gain in their cheaper models, but for the most part, you should
expect only less features in the cheaper units. Back
to Top
What operating frequency is best for finding gold?
The frequency of the older style TR detectors that were “state
of the art” about ten or fifteen years ago was in the neighborhood
of 100kHz. The first new VLF detectors operated at about 2 kHz, and
while they penetrated deeper, it was more because of how they operated
than their frequency. Typically, most VLF detectors made today are operating
in the range of 5 to 15 kHz while gold detectors typically operate at
about 20 kHz. The increase in frequency gives a minutely greater response
to little tiny bits of gold, but again their increased response to small
targets is because they typically have about ten times as much gain
as general purpose detectors. Increasing the frequency much above 20
kHz gives a tiny bit more response in air testing, but the detector
will lose that increase as soon as a target is laid on the ground. Back
to Top
Are multi-frequency detectors better than single
frequency types?
I have not played with one of the newer multi-frequency types, but I
hear they have extremely good depth in some instances. But they have
problems in many other instances, such as not being able to discriminate
out iron trash at great depths and failure to get good depth while working
around electric powerlines. Plus, they consume much more battery power.
They may be worth the extra cost for some people, but I am not sure
yet that simply having more frequencies automatically increases depth.
Back to Top
Why do some pennies read different than others?
The composition of the "old" penny, which includes the
"Wheat Penny" is copper and appears to a metal detector similar
to a clad or sandwich dime. The composition of the "new" penny
is zinc and may read close to screw caps. This transition took place
in 1982. There may be some of both in 1983. Old "Indian Head"
pennies that have been in the ground for a long time tend to read similar
to a zinc penny. Back to Top
What is the difference between a "wading"
coil and a regular coil?
A wading coil is designed to be "neutral"
in water, i.e. it will not float or sink quickly. This coil, on land,
is heavier than normal coils. The spider coils (9x8 and 10x12), although
not specifically designed as wading coils, are also neutral in water
and therefore are usable as wading coils. Back
to Top
Are all Tesoro coils waterproof?
All Tesoro coils are waterproof when they leave the
factory. The connector at the coil is waterproof and the coil itself,
whether it has a bottom or is of the open design, is also waterproof.
The connector at the coil housing is not user serviceable and should
never be turned or removed. Permanent damage will result if this is
attempted. What is not waterproof is the end of the coil wire that plugs
into the housing. The electronics housings are also not waterproof,
except for the water models. Back to Top
Multi-turn ground balance
pots - how do they work?
There are two versions of multi-turn ground balance
pots in Tesoro Metal Detectors: a 10 turn and a 3.5 turn. All current
models use the 3.5 turn pot. When turning either one, it's best to get
a reference point to start. To do this, turn the 10 turn pot 11 times
CCW, and the 3.5 pot turn 4 turns CCW. This will assure the pot is at
the beginning of it's working range. In both pots, you may not feel
the end of the range because when it gets there, the pot will still
turn freely. This is NORMAL and will in no way damage anything. If you
have a good sense of touch, you will probably feel a slight drag when
it gets to either end of it's working range. Follow the procedures in
your owners manual from then on. Other multi-turn pots may work differently,
but the ones used on Tesoro Metal Detectors work as outlined above.
Back to Top
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