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#1
July 6th 08, 09:57 PM
posted to rec.aviation.soaring
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Cover it if 302 needle does not zero at power up.
Cover up the face.
The Cambridge 302 vario needle can fail to zero correctly at power up. The instrument uses a light source and photo sensor to find the zero position. If bright light overpowers the light source then the needle can fail to position properly. Sometimes it goes around in circles for a while. Power it up with the face covered. This information is already posted in this newsgroup inside some threads on similar tipics. As far as I can tell it is not documented on the CAI web site or in the manuals. I thought it was worth posting again as its own topic and hope it helps someone. Mark 
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#2
July 7th 08, 01:04 AM
posted to rec.aviation.soaring
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Cover it if 302 needle does not zero at power up.
Page 21 of the manual.
"MaKoRide" wrote in message ... Cover up the face. The Cambridge 302 vario needle can fail to zero correctly at power up. The instrument uses a light source and photo sensor to find the zero position. If bright light overpowers the light source then the needle can fail to position properly. Sometimes it goes around in circles for a while. Power it up with the face covered. This information is already posted in this newsgroup inside some threads on similar tipics. As far as I can tell it is not documented on the CAI web site or in the manuals. I thought it was worth posting again as its own topic and hope it helps someone. Mark
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