Using third party Strain Amplfiers, feeding DC output to NI 1102 multiplexer to increase channel count, has anyone a vi. already?

[terry]

As I see required events, measure un-strained millivolt value, file, after applying force, measure strained millivolt value, determine difference between strained and unstrained, convert delta millivolts to strain, and present.
Using NI strain gage boards is good, if we already had them. They are either 4 or 8 chan/board. Amplifiers we already have along with several NI 1102 multiplexed boards. These allow us 32 strains/board.
Calibration can be done by using external shunt with calculated equivalent strain, setting amplifier gain accordingly i.e., 1000ue=1.0 volts.
Can eventually arrive at working vi., but if someone has done this and
are willing to share, it would be of great benifit. Time is always of the essence.

[Tiptop]

Hello,

Have you taken a look at the Convert Strain Gauge Reading VI that ships with LabVIEW? You could still use an amplifier and then divide the input voltage by the gain and then feed the output to this conversion VI. The VI can be found by searching you functions palette for the word �strain�.

Just let us know if this will help out!

-Justin T.
National Instruments


Also, you can change the type of this VI by right clicking and selecting Select Type.