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#1
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Garmin 330TXP temp probe pictures
Some of you wanted to see the variable resistor in the line out to the temp
probe. As most have found, the probe does not transmit the proper temp. Here they a "Curator" http://temp.corvetteforum.net/c5/kgr...7__medium_.jpg http://temp.corvetteforum.net/c5/kgr...8__medium_.jpg http://temp.corvetteforum.net/c5/kgr...9__medium_.jpg http://temp.corvetteforum.net/c5/kgr...0__medium_.jpg |
#2
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Garmin 330TXP temp probe pictures
karl gruber wrote: Some of you wanted to see the variable resistor in the line out to the temp probe. As most have found, the probe does not transmit the proper temp. Karl, I must have missed the earlier post. What is the issue with the OAT probe? |
#3
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Garmin 330TXP temp probe pictures
As supplied, it isn't calibrated.
Karl "mikem" wrote in message ps.com... karl gruber wrote: Some of you wanted to see the variable resistor in the line out to the temp probe. As most have found, the probe does not transmit the proper temp. Karl, I must have missed the earlier post. What is the issue with the OAT probe? |
#4
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Garmin 330TXP temp probe pictures
Karl,
Some of you wanted to see the variable resistor in the line out to the temp probe. As I said in my mail to you already: Thanks a lot! Do you happen to know any resistance values printed on the thing? -- Thomas Borchert (EDDH) |
#5
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Garmin 330TXP temp probe pictures
I'll ask Jack, next time I see him.
"Curator" "Thomas Borchert" wrote in message ... Karl, Some of you wanted to see the variable resistor in the line out to the temp probe. As I said in my mail to you already: Thanks a lot! Do you happen to know any resistance values printed on the thing? -- Thomas Borchert (EDDH) |
#6
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Garmin 330TXP temp probe pictures
Thomas Borchert wrote:
karl gruber wrote: Some of you wanted to see the variable resistor in the line out to the temp probe. Do you happen to know any resistance values printed on the thing? I don't know what resistance it is, but I'll add that it looks like a multi-turn trimpot, maybe 15 turns. This lets you adjust it more closely, and also these type of trimpots are usually sealed a little better. This kind of trimpot is maybe US$2 at a large electronics supplier. (The more common types of trimpot are usually less than one full turn, maybe 300 degrees, and are usually not sealed very well.) You could work out the appropriate resistance by measuring the resistance of the temperature sensor at various known temperatures and coming up with a value of "degrees per ohm". Note that the resistance/ temperature relationship of the sensor may or may not be linear. Also, depending on the sensor, adding a series resistor probably only lets you correct the reading (reliably) in one direction. You could add a parallel resistor but I don't think this would work very well, depending on the range of temperatures you want to measure. Disclaimer: This is based on experience with electronics in ground applications. I don't have an A&P; I don't even have a TG&Y. Your mileage may vary. Matt Roberds |
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