Flipping through some forums about detecting, I came across one very interesting question. Its essence is that the Fisher F44 because of its power in 2 AA batteries, does not preform as well with a large coil as other detectors. Because of this I have 2 questions:
- How does a metal detector with a large coil lose in depth of detection when the charge in the batteries decreases?
- Did the engineers at Fisher accidentally mess up with the power ratio = depth with a regular coil?
To answer these 2 questions, I need to preform a small test, which will require: a coin, a ruler, a large coil (Nel Storm 13×14”), 3 sets of batteries and the Fisher F44 itself.
I chose the most equable mode- JEWELRY. The sensitivity i set to 10 – only so the detector with a vertically standing coil in a room could be quiet. I had three sets of different charged batteries with a different voltage, which on the battery indicator showed three black segments, two and one. For this test, we will not count the grey segments.
Now that i have told you the test conditions,i will show you the result.
|Battery Segments||Storm 13х14” coil (cm)||Standard 7х11” coil (cm)|
Now we analyze the results obtained, and answer the questions:
- In my opinion, the loss in depth is not significant. For me, a centimeter is not the value that can drastically affect the effectiveness of detecting.
- Regarding the regular coil, the engineers at Fisher Research Labs calculated everything without a flaw.
After carrying out the test with the F44, I had a question: do other metal detectors lose depth when the batteries are low?… I have never thought about this.
P.S. Pulling out and changing the batteries from the Fisher F44 Metal Detector was smooth and no problem at all- all was built firmly and reliably.