semiconductor strain and non linear scales

[Ronny_C]

Dear,

it's not completely clear to me if it's possible to read semiconductor strain gauges with NI hardware?
Do I need special hardware or do I use a normal bridge circuit analog input card (eg NI 9237)?

An added problem with semiconductor strain gauges is the need for linearization of the output because the

basic resistance versus strain characteristic is nonlinear. Is this possible in LabView?

As far as I know, I can only create linear scales in Ni Max?

Thanks in advance,

Ronny Comyn

Belgium

[Yamaeda]

Yes you can read strain gauges.

No, you dont need special hardware, but it makes things alot easier as signal levels are already adapted.

There's a Convert Strain Gauge Reading which you can read the help text about, depending on the bridge type it'll use different (some are non linear) conversions.

/Y

[Ronny_C]

Dear,

I'm still struggling with this. 

I have a HBM data acquisition instrument with can read both normal (foil) strain gauges as piezoresisitive strain gauges. 

Now, I can perfectly read piezoresisitive strain gauges with this device.

When I want to do the same with NI hardware (NI 9237) the signal is quite different, however all the settings are the same 

(full bridge, gage factor 130, 350 ohm , ...)

How is this possible please?

Kind regards,

Ronny

[Ronny_C]

Anyone who has some knowledge about this?

Thanks!

Ronny