UKC Forum Member
Registered: May 2004
Your right it is electronic. It has something to do with the voltage variation according to the info I posted.
This is for informational purposes for any one so inclined to accept it as useful or not as to why their compass goes haywire..
Here is more...…….
It's not the higher voltage of the NiZn cells that avoids the problem .. it's the flat discharge profile that avoids it. Rather than slowly dropping in voltage, these puppies kinda fall off a cliff when depleted, but hold voltage very well during use. If you don't get voltage drift with use or when you replace depleted cells, you don't have compass issues. The voltage is similar to that of lithium cells. The only downside is that when that first bar drops on the display, you'd better have another pair of cells ready, because you have only a few minutes left!
An electronic compass works with 2 (or sometimes 3) magnetometers. So it can detect a magnetic field along two or three axes.
There are two 8 pin chips on the left and below are two magnetometers. And one is placed 90 degrees to the other to be able to measure two axes.
Now these two magnetometers output voltages in return to the magnetic field applied. Due to metal parts in the remaining device and due to limited absolute accuracy of such devices, you cannot determine the exact heading just from these two values. But once the device has been rotated and the CPU monitoring it has seen e.g. the max values returned by the magnetometers when each of them pointed exactly north/south, then the CPU is able to calculate the heading quite precise.
However, if the device is switched off, it usually looses the calibration data. Also after some time the sensors behavior may change as different battery voltage levels may cause different magnetic fields to be generated by other parts in your device ..
IT SEEMS THAT EVERYTIME A BREED OR LINE OF DOGS GET POPULAR IT EVENTUALLY LEADS TO ITS RUINATION BY UNINFORMED PEOPLE BREEDING WITHOUT DOING THEIR RESEARCH FIRST.
Gone but never forgotten:
NtChGrCh Dryfork Punkin
NtChGrCh Dryfork Little Blue Baby Doll
2009 Pa Show Dog Of The Year
GrCh Dryfork Little Black Book
2009,2013,2018 Pa. State
Show Handler Of The Year
GrCh Dryfork Black Dog Raine
Gr.Ch. Black Dog Black Cherry
Gr.Ch. Make My Day Sunny
2018 Pa. Show Dog Of Year
Gr.Ch. Batman's Poison Ivy
2011&2013 WTDA Pa State Champion
2011&2013 Overall Hunt For The Cure
Ch. Jay's Greenridge Heidi
In memory of my best friend "Jay"
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