Extended decay time.
Still tinkering. Trying to define results on a non linear preamp, I am faced with the following problem.
All decay times seem to be extended. For example, my 0.6 gram test gold nugget still gives a considerable signal after 100uS. Since this is the longest delay reading, this cuts down considerably in the amplitude of the difference between the first sample, taken at 8uS and the last sample taken at 100uS.
I don’t know if this will be of any use, but it is intriguing.
The other problem I have in the testing procedure, is the lack of a standard to compare with.
Has anybody posted something like a testing standard in the past? What I mean to say, I have a few coins of different size and metals, steel washers and such that I use for testing.
The smallest test piece is a 0.6 gram gold nugget.
Probably the most common test samples in the USA would be the 1c, 5c, 10c, 25c US coins, whereby one has to watch for the dates, since the metal has often changed over the years.
However, European or Australian coinage is very different, even cool drink cans are different, so we don’t seem to have a standard that lets us compare the sensitivity of our metal detectors.
Any good ideas out there?
Tinkerer
Still tinkering. Trying to define results on a non linear preamp, I am faced with the following problem.
All decay times seem to be extended. For example, my 0.6 gram test gold nugget still gives a considerable signal after 100uS. Since this is the longest delay reading, this cuts down considerably in the amplitude of the difference between the first sample, taken at 8uS and the last sample taken at 100uS.
I don’t know if this will be of any use, but it is intriguing.
The other problem I have in the testing procedure, is the lack of a standard to compare with.
Has anybody posted something like a testing standard in the past? What I mean to say, I have a few coins of different size and metals, steel washers and such that I use for testing.
The smallest test piece is a 0.6 gram gold nugget.
Probably the most common test samples in the USA would be the 1c, 5c, 10c, 25c US coins, whereby one has to watch for the dates, since the metal has often changed over the years.
However, European or Australian coinage is very different, even cool drink cans are different, so we don’t seem to have a standard that lets us compare the sensitivity of our metal detectors.
Any good ideas out there?
Tinkerer
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