Hallo zusammen,
I have a new project, to measure the displacement using LVDT sensors.
I am using NI 9237 module with the cDAQ9184, and for the LVDT is from HBM.
Here I am asking if someone has an idea, how to connect the sensor to the 9237 and calibrate it.
Any suggestion will be very appreciated
Thank you in advance..
Hi pr,
Zitat:how to connect the sensor to the 9237
See the
NI9237 datasheet, pages 4 and 5…
For the LVDT sensor you have to check its manual!
Zitat:and calibrate it.
Calibration is done by the manufacturer…
A classical LVDT will need a AC (bridge) exitation.
All HBM LVDT sensors I knew (and I started to collect them) are:
-Quite old
-without DC output.
Your 9237 only supports DC-excitation.
However, you can try the soundcard headphone out to ecxite with 1kHz sine and the stereo line-in to read the bridge output and the exciter-voltage (maybe after a voltage divider). The voltage ratio is proportional to the LVDT core displacement. (try tone detection on both signals)
Or hunt for a an old AC bridge amplifier...
What sensor(s) do you have? What is your application?
(If you really have an old HBM LVDT sensor, I guess you want to reanimate some old equipment)
HBM stoppet LVDT production shortly after going into the strain-gauge production...
Classical length sensors can be calibrated with a micrometer, gauge blocks down to laser interferrometer... use the best reference you can grap
According to the VIM (and Wikipedia) anyone can do a calibration, not only the manufactor.... otherwise I would be out of business
