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Can One Oil Temp Resistance Bulb Run Two Instruments?

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nuckolls.bob(at)aeroelect
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Posted: Wed Oct 12, 2016 12:19 pm Post subject: Can One Oil Temp Resistance Bulb Run Two Instruments?

At 01:15 PM 10/12/2016, you wrote:

  	  Quote: 	
		  Thanks Bob, I expect you're right.  I may set up a simple bench-top experiment just to see how much each gauge under reads with the bulb in a pot of boiling water. 	


   Be still my beating heart . . . you're a good man

   Charlie Brown!  Experimentation, measurement and

   verification is one of foundations for progress.



   I seem to recall a similar thread although many

   moons ago and I'm not sure it was here on the

   List . . . it may have been on the Compuserve

   AVSIG . . . that goes back a few years.



   I think what we decided was that the master

   gage was essentially a voltmeter . . . that

   produces a needle position in concert with

   a temperature/resistance characteristic

   of the matching transducer.



   I think one of the guys built a gain-of-one

   buffer amplifier on a piece of perf board.

   Input to the amplifier was a 'sample' of the

   voltage at the master-gage sensor terminal.

   This voltage voltage was simply repeated and

   and passed on to the slave-gage without disrupting

   of the master gage.



   This was used successfully on a variety of

   Rochester-like, moving magnet gages for

   a host of measurements. No calibration required,

   just gages proven to be identical.



   While conducting your bench tests, it would be

   useful to know the sensor signal's current

   as well as voltage drop across the sensor

   at the 100C test point. You'll need to get

   a milliammeter in series with the sensor.



   I can help with parts selection and a schematic

   once that data is known.



 

 

   Bob . . .

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nuckolls.bob(at)aeroelect
Guest

Posted: Fri Oct 14, 2016 1:08 pm Post subject: Can One Oil Temp Resistance Bulb Run Two Instruments?

At 01:15 PM 10/12/2016, you wrote:

  	  Quote: 	
		  Thanks Bob, I expect you're right.  I may set up a simple bench-top experiment just to see how much each gauge under reads with the bulb in a pot of boiling water. 	


   Here's an article by an individual

   wrestling with understanding/calibration

   issues on VDO automotive gages.



  http://tinyurl.com/h4qo22g



   It would be interesting to 'characterize'

   the gages you have in hand by measuring

   the current through the gage over the

   instrument's calibration span.



 

 

   Bob . . .

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