The TS’s original plot is output voltage vs pressure. How is LTSPICE supposed to duplicate that plot?

 

I have more confidence in the results with transistor-based models than with linear controlled source-based models.

 

he TS’s original plot is output voltage vs pressure. How is LTSPICE supposed to duplicate that plot?

Hi Bob,
If I understand your query correctly, as resistor Rm represents the resistance of the Sensor, it would be possible, using LTSpice, to inject a series voltage, proportional to the pressure in that Rm path.

I hope the TS comes back with more information so that we can post are meaningful response.
E

 

Hi Alex,
Why did you post #17 with a circuit did not produce the plot?
This plot is also different from your post #19 plot.

I am trying to determine the cause of the problem .
E

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Thanks all of you for your reply, i was off work on Friday evening, now i am back to work again. before i also try simulation on Proteus, but simulation results are totally different from my real circuit results. i am trying to figure out the root cause. if you have any further suggestion share with me, i will try, if i could make it successfully i will share results with you. thanks again

 

but simulation results are totally different from my real circuit results. i am trying to figure out the root cause

Perhaps the real circuit and simulated circuit are not the same. I would recheck all the wiring and values of components in the real circuit.

 

The LM4040 R_shunt value found page 13
https://www.digikey.com/htmldatasheets/production/1878/0/0/1/lm4040bex3-2-5-t.pdf
The best precision that TS922 op amp can use.

The transfer function post #10 very good and examples showing that ideal has other approaches in simulation.
Sensors along with filters to match what is shown here might be the next step because we need good sense.