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Question about ATD

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cubdh23

New Member
Hi, There is this force transducer that gives out voltages depending on the force on it. When connected to my ATD input of my motorola 68hc12 board, it gives 0 volts reading. I noticed that when i connect 1000 ohms or less to the transducer output, it gives me zero volts so i am guessing that the ATD input has a small impedance and is loading the transducer.
Any suggestions on how to fix this problem?
thanks a lot
 

Jay.slovak

Active Member
cubdh23 said:
Hi, There is this force transducer that gives out voltages depending on the force on it. When connected to my ATD input of my motorola 68hc12 board, it gives 0 volts reading. I noticed that when i connect 1000 ohms or less to the transducer output, it gives me zero volts so i am guessing that the ATD input has a small impedance and is loading the transducer.
Any suggestions on how to fix this problem?
thanks a lot
Try small 1nF Capacitor OR (better) is to use OpAmp with gain of 1 (aka voltage follower)...
 

Oznog

Active Member
Is that transducer amplified internally?

Most force transducers are load cells based on a whetstone bridge. That means they are differential and thus you cannot read a single voltage vs ground, the output is the difference between the two outputs.

Load cells are also often low amplitude signals. Do you have a spec on what amplitude of signal you expect? Some sensors have an output which spans only millivolts full scale.
 
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