02-21-2018 04:15 PM
Background
I'm trying to measure torque with an torque cell (Transducer Technologies RTS-5) and myRIO. I've adopted NI's myDAQ/strain recommended code for the myRIO as suggested by NI here, but the output is garbage (noisy 0 V).
Sensor pinout
Suggested connections
My connections
My code
I'm a bit confused about the Wheatstone aspect of the torque cell. Does the transducer contain its own Wheatstone bridge, or do I need to make my own bridge and connect the torque cell as one leg of the bridge?
Solved! Go to Solution.
02-22-2018 05:37 PM
The wiring seems correct to me. How are your tasks configured? In addition, have you tried this outside of a timed loop?
03-01-2018 07:30 PM
Hi Brian,
Sorry for the radio silence. I figured out my problem! The output of the torque sensor (a full bridge device) was at most 2 mV which is near the resolution of the myRIO's ADC. I used an op-amp to amplify the signal before reading it with the myRIO. However, I also realized that I don't need a myRIO for my application, so I've switched over to a USB-6361 DAQ + SC 2345 conditioning block + SG24 strain gauge modules which automatically excite and amplify the torque sensor.
07-01-2018 09:11 PM
Hi Brian,
Is it will function the same if i using a NI 9215 module slotted to the NI cDAQ-9172(NI CompactDAQ) ?
07-01-2018 09:23 PM
Hi Ashraf,
What are you trying to measure? I'm not sure an NI 9215 can handle bridge-based measurements.
07-01-2018 09:48 PM
We trying to measure torque of a rotating wind turbine. Oh i see, that's mean I'm need a different module for bridge-based like NI-9237?
07-01-2018 10:39 PM
Correct.
Some bridge-based sensors have a separate "box" that powers and scales the mV-level output of the sensor bridge into a standard analog signal (pos. and ground instead of pos. ground, and two ref. voltages). Then you can just use a standard analog input module.
Otherwise, you need a module made for bridge-based measurements.