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Panel Testing

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mp.gamble(at)tiscali.co.u
Guest

Posted: Wed Aug 19, 2009 11:54 am Post subject: Panel Testing

Checking my panel on the bench  before  installation. 

 Powered up with 12V and before switching off in a panic, I observed a rise on the voltmeter  which I expected but also a rise on the fuel gauge, the oil pressure and at  least one of the temp gauges .

 What should I expect the standard rotax engine  instruments to read if their sensors are not connected? Have I wrecked them  already?

 Reassurance needed.

 Thanks

 Mike Gamble

 XS 440



    [quote][b]

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mikenjulie.parkin(at)btin
Guest

Posted: Wed Aug 19, 2009 12:19 pm Post subject: Panel Testing

Mike,  

   

I think you will find they are fine.  To test the function, use a potentiometer.  

Some of the them read full scale, others read min scale when disconnected from the sensor.  

   

Regards,  

   

Mike  

   

       

From: owner-europa-list-server(at)matronics.com [mailto:owner-europa-list-server(at)matronics.com] On Behalf Of mike gamble

 Sent: 19 August 2009 20:54

 To: Europa-List(at)Matronics.Com

 Subject: Panel Testing  

  

  

       

Checking my panel on the bench  before installation.   

    

Powered up with 12V and before switching off in a panic, I observed a rise on the voltmeter which I expected but also a rise on the fuel gauge, the oil pressure and at least one of the temp gauges .  

    

What should I expect the standard rotax engine instruments to read if their sensors are not connected? Have I wrecked them already?  

    

Reassurance needed.  

    

Thanks  

    

Mike Gamble  

    

XS 440  

  

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 08/19/09 06:03:00  

       [quote][b]

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budyerly(at)msn.com
Guest

Posted: Wed Aug 19, 2009 3:36 pm Post subject: Panel Testing

<?xml:namespace prefix="v" /><?xml:namespace prefix="o" /><![endif]-->  You're OK.

 Most instruments (VDO/Mitchell) read zero (or high ohms) open and  pegged (low ohms) or shorted to ground.  Depends on the sender.  Most  engine instruments use a resister that sends 5 volts to the sender wire.   They read the differential voltage through the sender to ground.  Ground  the sender wire and it should read zero.  Fuel senders are an odd sort,  depends on the manufacturer, type (resistive or capacitance).     

  

 Bud Yerly

 [quote]   ---

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mp.gamble(at)tiscali.co.u
Guest

Posted: Fri Aug 21, 2009 12:24 pm Post subject: Panel Testing

Thanks for the input gentlemen. I wired a variable  resistance box to the sensor terminals as suggested and found that the oil  pressure indication rose as the resistance was increased. Same happened with the  fuel gauge ( Europa supplied mod) so I am reassured!

 Mike Gamble

 440 Mono

    [quote][b]

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