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"wave effect"

A

Anonymous

Guest
When the Impulse was being field tested prior to its introduction, we observed that when being used for scuba work, it would would respond to the changes in water depth due to waves on the surface. This phenomenon was a mystery to us.
Well, anyway, after reading several posts (esp. Eric's "Water depth and Sensitivity" 16 Dec 01) it looks like the mystery has been solved. I figured the Impulse had low enough sensitivity to low conductivity items that it wouldn't see salt water, but the pulse delay numbers cited by Eric together with his explanation of what happens at depth, indicates that the Impulse was probably seeing the salt water after all.
The Impulse is fully static, which makes it more sensitive to such effects than if it had an autotune system.
This is a great forum, what eh? Thank you to everyone who has contributed to it.
--Dave J.
 
Hi Dave,
In one of the early experiments, we lowered a coil, mounted in a frame so that it stayed horizontal, at 1 foot increments over the side of a boat, in about 100ft of water. As I remember the coil was 20in diameter and the electronics in the boat running at 100uS delay. This experiment was done in a bay on a day when the sea was very flat, and the boat
 
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