Strain Range Error when reading Displacement Gage

[lokisspydr]

Sean, Here is the error I got and yet again it continually changes.

[Sean_F]

Hi Loki,

Could you attach a screenshot of the error and your task setup in MAX? Did you set up a Bridge (V/V) task?

[lokisspydr]

Let's try this again..... Here is the snapshot of the error. Yes it is a Bridge V/V Max: 25m Min:-25m Vex:5 Full Bridge 350 ohm. This the only pic I took on Saturday when I thought I had posted it. No time to play with it right now. It gives the error and I change to specified value and get more errors. With Min/Max @ -1m/1m it will calibrate but erratic readings that seem to scale from 0-5mand back to 0.

[lokisspydr]

Won't allow me to post pictures???? JPEG 151kb???

[DrewPierce]

posting for Lewis... see attachment "Bridge Error.JPG"

[lokisspydr]

Thanks. Ha ha. I get it Drew-P. That's stellar!

[JustinP]

Hi Loki,

One thing I noticed is that you have your sampling rate set at 5 Hz, this number is being coerced to the minimum sampling rate for the device so you may receive more data than you are expecting.  About the 200077 error code, if you put the MAX and MIN values within the range specified in the error message you will be able to run the task.  These MAX and MIN values are calculated based on the other information you provide.

Justin

[lokisspydr]

Justin, The MIN/MAX that I have entered have been the MIN/MAX thta LabVIEW acknowledges. I have (as stated in previous posts) calibrated values for this device (3 sets) that LabVIEW will not acknowledge and returns the Error. The 5Hz is a lower sampling rate than I use on other DAQ Programs and have no issues using this, or any like device i.e. extensometers. The issue is that when using other programs I use a signal conditioner and there should be no need to use one with LabVIEW. Although, we have hooked it up through a signal conditioner and are able to obtain a usable but highly noisy signal.

[JustinP]

Hi Loki,

The problem you are having I believe has to do with the custom scaling that DAQmx applies to your measurements.  I am attaching a link to a document that addresses this issue. 

http://digital.ni.com/public.nsf/allkb/4C8FF17A347BE03E86257662004E24B7

Justin

[lokisspydr]

Ok.... so I tried to create a scale and here's what I get.....

I get an error saying that my pre-scaled units cannot be V/V and I can select Volts. Then I select Volts and I get an error saying that my pre-scaled units cannot be Volt and I can select V/V.