VisPacem
Samba Member
Joined: July 15, 2007
Posts: 1143
Location: Las Vegas
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 Posted: Sat Nov 21, 2009 9:16 am Post subject: VDO gauge markings : kinky |
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I have a VDO Cockpit serie water temperature gauge. To me, I said to me ok?, the markings are esoteric and nonsensical.
The 200 degree mark is *almost* centered. OK.
The marking between 100 and 200 degrees are unevenly marked 
Why? I am still wondering. On a Smith, a Lucas, a Jaeger or Veglia the markings are clear, evenly spaced for easy identification.
I am still at a loss to decipher the value of each marking, even the *almost evenly spaced one between 200 and 250. Could it be 225 ?? duuuuuhh
It is not a matter of importance as we are dealing with a proximity gauge not a scientific instrument and I only use it as an indication of things to come.
However not knowing just bothers me.
Anyone knows?
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LG aka VisPacemPB, *The* party Pooper
No Regrets (Nothing to do with Vanagons) |
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Dogpilot
Samba Member
Joined: October 03, 2005
Posts: 4205
Location: Flagstaff, AZ
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| Posted: Sat Nov 21, 2009 9:34 am Post subject: |
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Typically, most automotive gauges are for looks. A step above an idiot light. The VDO gauge is marked according to what the sensor reads and what is displayed, much like a gas gauge. The tank, unless a cube, does not have capacity that diminishes in a linear fashion. So the gauge is marked to reflect this, non-linear capacity, not evenly, but to reflect actual capacity. Likewise, the senders don't have linear response. I bet if you look at the Lucas (my personal hero), it may be only accurate at the normal temp range and quite a bit off on either end of the spectrum. Which is really where it only needs to be accurate. To see the non-linear response I refer you to the resistance graph of the coolant sender for an example:
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Geology with a Syncro rocks!
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