load cell simulator

does any one know where i can get a drawing to buils a load cell simulator for home hobbie education use?

Hadji,

You don't really need to simulate a load cell, and you don't have to have a drawing to install one. Instead, use the real thing. You can buy small inexpensive low-weight load cells. Buy a load cell, mount it on a support, hang a box, hopper, or bin of some type from the load cell. Connect the load cell to a DC voltage supply (that matches the requirement of your particular cell) and a weight transducer or weight controller, and you are in business with a real load cell, not a simulated one. Put a weight in your load box, and read the weight in whatever units you have calibrated (usually grams, kilograms, or pounds).

Here is an Omega type LCL load cell that measures up to 40 lbs for $75.
http://www.omega.com/ppt/pptsc.asp?ref=LCL

The Omega DP25B-S provides excitation voltage and reads a load cell input, for $250. The older cheaper DP25-S is still available as a special order.
http://www.omega.com/ppt/pptsc.asp?ref=dp25b&nav=

Omega also sells the bare unmounted strain gages - 5 for about $35. You can purchase one of those and glue it to a metal plate to build your own load cell, but you would have to figure out how to make it work.

You might want to get a free copy of the Omega Engineering Pressure, Strain, and Force Handbook, with lots of useful information.
http://www.omega.com/literature/pressure9/

I agree with Lancie. The best load cell simulator is a load cell itself. It might help if you are more specific about what you are really trying to accomplish.

Generally a load cell is just a wheatstone bridge. You could simulate the type of signal you will see with some resistors and a potentiometer and a power supply. Most load cell signals are very low level, so you normally have an amp that converts it to -/+10vdc or 4-20mA. So the next question is, what do you want to read your load cell with?

A load cell is wheatstone so 4 resistors in a quadrant.
then put 10 V on top and bottom
then use a voltmeter on left and right side of resistors.
if you take one resistor in your hand you should see a little difference in the output.
it is in range of 10 mV per V
or if you put 10 volts as supply
you will see a max of 100 mV on your meter.