Accounting of the derivative of the signal

Hello

I am a beginner LabVIEW-user and I have a question that maybe painfully obvious for a more experienced user.

I use a precision Sartorius CP225D balance to save the change of mass scale mg due to withdrawal and the dispensation of a fluid in a container. What is the piece of blocking air flow, bringing the temperature of the room and immutable or reposition the initial load for several hours, a fairly linear and continuous negative drift will occur for the display of the balance. This drift occurs without worrying if there is anything on the scale or not. I use VI Sartorius provided to read and note the readings.

How can I use LabVIEW to adjust this signal for this negative drift using the linear relationship I can derive from the previous examples of execution? I tried to collect the signal of the difference between the display of the balance and the linear relationship that I approached, but with time, even this manipulated signal falls to the display of the exact balance if he were allowed to run without being manipulated. Better yet, how can I manipulate the signal of a frame sequence curve flat prior connection for the signal already recorded in the following picture?

I would appreciate any guidance or assistance that could lead me to a solution. I tried to contact helpline Sartorius, but little help was offered. I will share as much information as possible.

Thank you for reading this,

Zach

Zach,

The instrument drift probably not linearly forever or the value wouldn't finally out of reach.  The manual I have donwloaded requires 30 miniute, 4 hours or 24 hours of warm-up, depending on the model and the application.

You can try saving records once per minute for 24 hours, starting by an intstrument of cold and let it run as stable an environment that you have available? Note the temperature, if possible.  Never stabilizes the drift?

What is drifting from the signal you need to measure? What is drifting? How fast your fluid distribution affect the readings?

Lynn

Tags: NI Software

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