How to reduce the noise in an acquisition of data USB-6251

Hello world!!!

I have a few questions about a system that I have developed using a data acquisition OR usb card 6251. The pressure control system.

First of all, the signals are acquired using an Omegadyne pressure transducer. (Typically, the signals are between 0.1 mV and 38 mV, pressure is between 0 to 50 lb/PO2). The transducer is connected to the usb-6251 daq card (I use pinout of the 1 and 2 for the signal acquisition, also, I have a 100 K resistor between pin 2 and 3) and the card is connected directly to the computer. In addition, I have an omega counter, I use it only to see pressure on the screen. But long term, it will be useless.

One of the problems I have found is the noise, the measured voltage values change much. Even if the figures in the player screen do not change so much... (or do not change)
The system should regulate the pressure so if every second it changes a lot, the system did not work properly. How can I make the technical more similar to that of the meter? In the labview program that I use, I use a block 'base DC', he reduced noisy signals a lot, but not enough that experience, I need more stable values.

Thank you

I don't mean in the /manuals of broaching and do not open .doc from unknown sources files (a chart single .png is fine ;-))

However, I guess you already measured in differential mode and the 100 k is a path for the currents of polarization forever

The reason why your counter is stable can be the fact, that she has a generation to filter low pass (on average) with a big enough constant time.

First things to do:

You did it that there is a filter anti-aliasing suitable for your sampling rate?

Read the signal on at least 100 ms (120ms in line 60 Hz) possible higher sampling rate and take a look at the signal (and display a chart as a .png or .jpg image)

This will give you an idea how the signal looks the same. Then you can choose a filter according to your system and the signal or other investigations to do not even catch the noise (groundloops, protection...)

You can use an example on the screws or the testpanel to the MAX for this measure.  (Personally, I prefer a similar scope :-))

Tags: NI Hardware

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