Doctorcoinz
New member
I am looking to purchase a device that i can hold close to the coil to get an accurate reading of the frequency , does such a device exist.
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testing what the frequency of a metal detector is.:confused:
- Thread starter Doctorcoinz
- Start date
Larry (IL)
Well-known member
A spectrum analyzer will do that but for the money one costs, I would rather just trust the manufacturer. 
Doctorcoinz
New member
I guess i will have to open the detectors up and a frequency counter on the transmit side . My multimeter has a freq counter built in but not tried it yet.
depending upon how sensitive your multimeter freq counter is, you can take and make a 6" diameter coil with maybe 20 turns and connect a 10K resistor across this coil. Then connect your freq counter across the resistor. With luck you will be able to read the frequency.
What detector are you trying to read the frequency????
VLF's usually have a known frequency and from that one can sort of tell what type of coins one might find the detector favors. PI's are a different story. PI's have a pulse rate which is really not the same. In the case of the pulse detector, pulse length sort of indicates what metals the detector might favor or be built to find. Contrary to some bs, metals do not have a particular favorite frequency. So if you have been reading a book on LRL's, forget it.
Reg
What detector are you trying to read the frequency????
VLF's usually have a known frequency and from that one can sort of tell what type of coins one might find the detector favors. PI's are a different story. PI's have a pulse rate which is really not the same. In the case of the pulse detector, pulse length sort of indicates what metals the detector might favor or be built to find. Contrary to some bs, metals do not have a particular favorite frequency. So if you have been reading a book on LRL's, forget it.
Reg
Larry (IL)
Well-known member
Before you get too carried away with a screwdriver, your CTX 3030 and other multi freq digital detectors sends a complex digital square wave. I don't think a frequency counter would be of much use........
Doctorcoinz
New member
The detector is an old C - Scope VLF 950 D. This was sold here in the UK in the late 70's. The detector works but it only gets about 3 inches on a large pre decimal penny. No one on the planet will
even consider repairing it as its too old so they say., I am, considering attempting to fault find on it. I used to repair analogue tv's and audio equipment some years ago but to be honest i don't have knowledge about fixing a metal detector. The coil could be bad but how to test if it's faulty without replacing it i am not sure.
even consider repairing it as its too old so they say., I am, considering attempting to fault find on it. I used to repair analogue tv's and audio equipment some years ago but to be honest i don't have knowledge about fixing a metal detector. The coil could be bad but how to test if it's faulty without replacing it i am not sure.