data acqusition with Labview

[cl]

I need to add a new Load cell to an existing data acqusition system. The following is the setup of my system.
PCI-MIO-16XE-50 board/SCXI 1001 Chassis/SCXI 1121 Module

The model of the load cell is LC401-10K manufactured by OMEGA. 10V exciatation voltage. The calibration factor given by the manufacturer is 3mv/v @10000lb.

How do I set the value of gain? How can I convert voltage readings into force?

[Filipe A.]

Hello;

You will need to get the information about the transfer function of the Load Cell (the gain that maps the physical unity into the electrical unity) from its Users Manual. When you have that part figured out, you just create a virtual channel in MAX, select a input voltage channel, and configure a Scale to match the load cell specifications.
After you did that, if you use that virtual channel in Labview, the readings will be in already in force unities, so you will be able to work with the physical unities already scaled.
Hope this helps.
Filipe

[mileshuff]

With 10VDC excitation the load cell will output 30mv @ 10,000lbs.
However, the mV/V is just a typical spec not an exact one. The cells
actual output is probably +/- 10% of that or so. Normally cells are
shipped with calibration reports showing the exact output for a given
load. It's also based on having exactly 10 volts excitation at the
load cells connector. That means the power supply used must sense or
the drop across cabling must be accounted for in your scaling factor.

cl wrote in message news:<50650000000800000099400000-1012609683000@exchange.ni.com>...
> I need to add a new Load cell to an existing data acqusition system.
> The following is the setup of my system.
> PCI-MIO-16XE-50 board/SCXI 1001 Chassis/SCXI 1121 Module
>
> The model
of the load cell is LC401-10K manufactured by OMEGA. 10V
> exciatation voltage. The calibration factor given by the manufacturer
> is 3mv/v @10000lb.
>
> How do I set the value of gain? How can I convert voltage readings
> into force?