Can anybody supply me a amplifier noisy measurement vi please?I am totally new to Labview.

[klhjkg]

I need to measure the noise of one amplifier I designed by connecting it to DAQ. It is an urgent task and can anyone offer help?Thanks a lot.

Message Edited by klhjkg on 05-30-2008 07:14 AM

[johnsold]

Do you want to pay someone to write a VI for you or do you want help in learning how to put one together yourself?

What is the amplitude of the output of the amplifier? Both full scale signal and expected noise in the absence of a signal. What is the frequency range or bandwidth of the amplifier? Is the noise bandwidth significantly different from the signal bandwidth?

Do you have a DAQ device? If so, which one?

What is to be done with the data after it is acquired? Display, save to file, control something?

What interaction with the software will the user have? What inputs does the user need to enter? Is there data to be read from a file (test parameters for different amplifier models for example)? What outputs will be presented to the user? Raw data measurements, Pass/Fail indications, other...?

Lynn

[klhjkg]

I want to aquire a basic noise measurement model of labview vi and learn to upgrade it by myself. The amplitude of output is around 50mv and the bandwidth of amplifier is 50-100Hz same as noise.The DAQ which I use is NI USB-6215.What I concern is  the noise voltage density within the bandwidth range of amplifier, just raw data measurement. 

[johnsold]

The specifications of the USB-6215 look like they should be OK for your application.

I would start with some of the DAQ examples for analog input. Run those and see if you get something which looks like the noise you expect. Then you can work on how to calculate the noise density later.

Lynn

[klhjkg]

I will appreciate that.Thanks.