V3i Specs Coil Specs

[gabbyhayes]

Because I'm an electronics tech with a curious mind I had to do a little investigating with my coils. This is what I've found.
The Rx portion of the coils is on pins 1&2.
The TX portion is pins 4&5.
You can see the pin numbers if you use a magnifying glass.
The resistance and inductance of the coils are as follows:
Eclipse 5.3
RX= 30.8 ohms 14mh 40 Rings
TX=3.3 ohms 561uH 19 Rings
Eclipse 4x6
RX=50.9 ohms 15.6 mH 29 Rings
TX=3.3 ohms 545uH 17 Rings
Eclipse DD 6x10
RX=55.2 Ohms 14.0 mH 31 Rings
TX=3.4 ohms 550 uH 19 Rings
D2 Stock Coil
Rx=44.1 Omhs 13.73 mH 32 Rings
TX=3.3 Ohms 550uH 21 Rings

The rings is a "Q" test of the coils and is an indicator of shorted turns.
As you can see the TX and RX of all the coils is similar both for resistance and inductance.

I was able to measure the inductance and "Q" with a Sencore LC103 test set I own.

This info should help anyone if they believe they have any coil problems.
Multimeters are cheap and can be used to test the continuity of their coils.
I'm assuming all my coils are good and from these results I think I can safely make this assumption.

 

[Rob in (Ca)]

That's some formula you got there gabby........... thanks for sharing..........My formula is that the V is a Necklaces Bloodhound......... With all my pass detectors, which have been basically invisible to necklaces

With only a few hunts with my new V, I already found 3 necklaces..

 

[texasranger]

Because I'm an electronics tech with a curious mind I had to do a little investigating with my coils. This is what I've found.
The Rx portion of the coils is on pins 1&2.
The TX portion is pins 4&5.
You can see the pin numbers if you use a magnifying glass.
The resistance and inductance of the coils are as follows:
Eclipse 5.3
RX= 30.8 ohms 14mh 40 Rings
TX=3.3 ohms 561uH 19 Rings
Eclipse 4x6
RX=50.9 ohms 15.6 mH 29 Rings
TX=3.3 ohms 545uH 17 Rings
Eclipse DD 6x10
RX=55.2 Ohms 14.0 mH 31 Rings
TX=3.4 ohms 550 uH 19 Rings
D2 Stock Coil
Rx=44.1 Omhs 13.73 mH 32 Rings
TX=3.3 Ohms 550uH 21 Rings

The rings is a "Q" test of the coils and is an indicator of shorted turns.
As you can see the TX and RX of all the coils is similar both for resistance and inductance.

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Hello Gabby.

Are you happy with the Rx reading for the Eclipse 5.3 ?

Should that also be around the 50 ohms mark ?......Just curious.

Calculated Q of the various coils average about 4 to 5 at 2.5 KHz, 12 to 14 at 7.5 KHz, and 43 to 44 at 22.5 KHz.

Your 'ring' test figures are different, probably because of the different frequency your test unit is using.

Nice to meet a technician who is interested in the background details of his detector...........Tex

 

[gabbyhayes]

Hello Gabby.

Are you happy with the Rx reading for the Eclipse 5.3 ?

Should that also be around the 50 ohms mark ?......Just curious.

Calculated Q of the various coils average about 4 to 5 at 2.5 KHz, 12 to 14 at 7.5 KHz, and 43 to 44 at 22.5 KHz.

Your 'ring' test figures are different, probably because of the different frequency your test unit is using.

Nice to meet a technician who is interested in the background details of his detector...........Tex[/quote]

Without having any specs it's impossible to say with any certainty whether the coils are up to spec. With the lower resistance for the Eclipse 5.3 I would expect the coil to ring more which it did. I also did a ground probe reading on all the coils and they were all similar with their strength at 2-3% with RX gain set to 15.

I've done a whole battery of other tests on the detector with my oscilloscope and will post these results when I have more time. In fact I hope to capture some of the waveforms and post the pics. I have yet to do this as my capture software is misbehaving so that could be down the road a bit.

What this does more than anything is give me a benchmark that I can use to compare results down the road if I ever suspect an issue with a coil.

The resistance readings are there so anyone can check the resistance of their coils if they suspect a problem. A digital volt meter with good accuracy can be purchased for about $50 these days so I thought it would help fellow detectorists locate coil faults.