# Counter/Timer

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## Understanding Circuit Timing/Tolerance

 AI, 0 - 100mVdc (5V common) Pressure Transducer (PT), Unit=PSI 7

I am trying to understand why these values were used.

why didnt they don't just use

0 mV

25 mV

75 mV

100 mV

why

0 mV

25.3 mV

75.6 mV

100.9 mV

Given the requirements below.

If someone can guide me, it would greatly appreciated. thank you

Pressure Transducer Signal Requirement Tests

 Test # Card # Signal # Signal Name Input (mV) Expected (mV) Tol (±mV) L Limit (mV) H Limit (mV) Note 1 1 0 0.000 1.000 -1.000 1.000 1 2 0 0.000 1.000 -1.000 1.000 1 1 25 25.000 2.000 23.000 27.000 1 2 25 25.000 2.000 23.000 27.000 1 1 50 50.000 2.000 48.000 52.000 1 2 50 50.000 2.000 48.000 52.000 1 1 75 75.000 2.000 73.000 77.000 1 2 75 75.000 2.000 73.000 77.000 1 1 100 100.000 2.000 98.000 102.000 1 2 100 100.000 2.000 98.000 102.000 2 4 0 0.000 1.000 -1.000 1.000 2 5 0 0.000 1.000 -1.000 1.000 2 4 25 25.000 2.000 23.000 27.000 2 5 25 25.000 2.000 23.000 27.000 2 4 50 50.000 2.000 48.000 52.000 2 5 50 50.000 2.000 48.000 52.000 2 4 75 75.000 2.000 73.000 77.000 2 5 75 75.000 2.000 73.000 77.000 2 4 100 100.000 2.000 98.000 102.000 2 5 100 100.000 2.000 98.000 102.000

 The pressure transducer circuit SHALL handle the maximum pressure transducer differential input voltage range of 0 mV to +105 mV for the circuits allocated to the pressure transducers used for  control.

The pressure transducer circuit will handle the maximum pressure transducer differential input voltage range of 0 mV to +133 mV for the circuit allocated to the pressure transducer that reports accumulator pressure, if used.

The pressure transducer circuit will handle the maximum pressure transducer differential input voltage range of 0 mV to +133 mV for the circuit allocated to the pressure transducer that reports supply pressure.

#### Pressure Transducer Circuit Timing/Tolerance Requirements

 The pressure transducer circuit SHALL have an accuracy of ±0.3 mV or better between the pressure transducer differential analog input to digital data output. The pressure transducer circuit SHALL resolve the pressure to 0.1 mV increments as digital data output.

Best regards,
Krispiekream
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## Re: Understanding Circuit Timing/Tolerance

@krispiekream wrote:
why didnt they don't just use

Who are "they"? Maybe you should ask them. We can only guess.

Maybe they did a calibration curve for the exact sensor in their possession to correct for nonideality and thus improve precision. I would guess that every sensor is slightly different.

What does this have to do with timing (your subject!)

Are you sure you posted in the right place. I don't understand what a pressure transducer and voltage levels have to do with counter/timer at all? You can probably ask a moderator to move this to a better place, once you decide where that is. Maybe here?

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## Re: Understanding Circuit Timing/Tolerance

ok thank you.

i was not clear on who to ask so i figured maybe someone from the forum can help.

i'll ask the author.

Best regards,
Krispiekream
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