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Accellerometer Interface

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NeilFord

New Member
Does anyone have a simple circuit diagram for a constant current signal conditioner. I want to interface an ICP type accelerometer with an oscilloscope.
 

stevez

Active Member
A constant current source can be made from an LM317 - see National's datasheet for more info. I do not know if the available range suits your needs but it is simple and low cost.

Not sure what other conditioning you need but filtering might be useful if you want to eliminate some noise or unwanted information - all depends on what you are doing. I cannot tell you what impact the use of the LM317 has - some characteristics are frequency dependent however I do not know to what degree these play out in the current regulator configuration.

I recall pulling some good "signal conditioning" application guidelines from TI or a similar website. Applications info for the sensor you've selected may address that.
 

Roff

Well-Known Member
From what I could gather by searching for "ICP accelerometer", I think you need a voltage-controlled current source with bipolar capabilities. Do a Google search on "howland current". One example is here.
If you need more details, I'll help as time allows.
 

mechie

New Member

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Roff

Well-Known Member
Mechie, I think you're correct, except it appears that you may need to use a PNP current source (or a constant current diode). the attached figure is Fig. 7 in this document. Apparently the source follower which is integral to the transducer is P channel.
 

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JimB

Super Moderator
Most Helpful Member
It is quite noticable that many people joining the board resurrect long dead topics, often as in this case, started by someone who has never returned.

JimB
 
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