Analog input data for NI USB 6001

[AbhishekEllapu]

Hi Gerd,

I am attaching the photos my readings of both sensors.

1. Absolute pressure its reading fine and also showing us the output. The reading is 1.06bar and I am reducing the pressure to 0.4bar.

2. Relative pressure is reading but its fluctuating and not showing the same readings as Absolute pressure . Here sensor Kistler 701A is connected to a charge amplifier kistler type 5041.

My question is that when i am reading pressure inside the chamber for  Absolute pressure graph its showing the right value but the other i.e relative pressure sensor its not showing same value I dont understand why. No when i reset my charge amplifier I should be able to start at 0.4 bar for example because the pressure inside chamber is 0.4. You already have my program can you please help me its important.

[GerdW]

Hi Abhishek,

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@AbhishekEllapu wrote:

2. Relative pressure is reading but its fluctuating and not showing the same readings as Absolute pressure . Here sensor Kistler 701A is connected to a charge amplifier kistler type 5041.

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Can you verify the readings of this AI channel using a simple DMM?

Do you get the same values using the DMM - or do you get different readings?

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@AbhishekEllapu wrote:

the other i.e relative pressure sensor its not showing same value I dont understand why. No when i reset my charge amplifier I should be able to start at 0.4 bar for example because the pressure inside chamber is 0.4.

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In image Analog3 it seems to show some noise for your "pressure 2 (relative)" sensor. (Or some aliased low frequency noise like power supply 50/60 Hz noise…)

Please verify your readings using a some other DAQ hardware like a simple DMM!

[AbhishekEllapu]

Hi 

I only have two NI USB 6001 devices because I am doing a project and the university provided only this. I don't have any other hardware.

Sorry is there any other solution for this problem?

[GerdW]

Hi Abhishek,

there is no simple DMM in the lab/at the department/in the whole university available for a short cross-check of your measurements?

Which kind of university did you choose?

[AbhishekEllapu]

hello,

I am sorry it was my mistake I thought of DMM as USB DAQ. I checked the voltage and my readings were also right in order to see the graph I just made the voltage value from data converted into millivolts as I was measuring less than 0bar relative. I got to know that my pressure sensor is calibrated in such a way that for 1bar absolute it's showing as 0 bar. So due to this reason, I couldn't able to see the rise in my other graph as it was showing values in volts. 

But anyway thank you very for your help.