After all the excitement and comments about air test Idecided to do several test using my TDI SL with stock 12” coil.
First off I charged the battery pack (11.35v).
Set the machine in a very good area with the coil elevatedwith the following settings:
Gain max
Ground balance off
Pulse 10
Conductivity switch, all
At these settings, using a US nickel I got a solid 12 to 121/4” air test, light, but repeatable audio.
I checked the machine every half hour and there was nochange in air test distances.
After four hours still no difference.
I turned machine off and checked the battery pack voltage(9.63).
Amazing discovery, the machine must have a very good voltageregulator, for the machine to perform the same as with a full charge pack.
One notable observation:
Gain of 7 to max gave the same results in air test, nodifference, even after 4 hours of continues running.
Drop the gain to 6 and the nickel could not be heard at 12”,but around 11 ¼”.
Fast forward:
Installed a fresh set of Rayovac batteries in my batterypack
These measured a total of 12.8 volts.
Did the same set of air test and the results are as follows:
Air tested a nickel at 13 1/4”, faint but repeatable audio.
This distance was continues for around an hour, then droppedto 12 ½”.
After 2 hours the air test was the same as the stockrechargeable battery pack.
Shutting down the machine and checking the voltage indicated11.35 volts.
I know you can buy a battery pack with 14.8 volts which willobviously increase the depth performance, but I wonder what the maximum voltagethat could safely be used in my unit!
Amazing machine to say the least.
First off I charged the battery pack (11.35v).
Set the machine in a very good area with the coil elevatedwith the following settings:
Gain max
Ground balance off
Pulse 10
Conductivity switch, all
At these settings, using a US nickel I got a solid 12 to 121/4” air test, light, but repeatable audio.
I checked the machine every half hour and there was nochange in air test distances.
After four hours still no difference.
I turned machine off and checked the battery pack voltage(9.63).
Amazing discovery, the machine must have a very good voltageregulator, for the machine to perform the same as with a full charge pack.
One notable observation:
Gain of 7 to max gave the same results in air test, nodifference, even after 4 hours of continues running.
Drop the gain to 6 and the nickel could not be heard at 12”,but around 11 ¼”.
Fast forward:
Installed a fresh set of Rayovac batteries in my batterypack
These measured a total of 12.8 volts.
Did the same set of air test and the results are as follows:
Air tested a nickel at 13 1/4”, faint but repeatable audio.
This distance was continues for around an hour, then droppedto 12 ½”.
After 2 hours the air test was the same as the stockrechargeable battery pack.
Shutting down the machine and checking the voltage indicated11.35 volts.
I know you can buy a battery pack with 14.8 volts which willobviously increase the depth performance, but I wonder what the maximum voltagethat could safely be used in my unit!
Amazing machine to say the least.
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