SCXI-1520 AND 700 OHM LOAD CELL?

[keiths]

Will the SCXI-1520 work with a 700 ohm full bridge load cell? I'm a load cell mfg proposing a 700 ohm load cell solution to a customer. He says he doesn't think the 700 ohm cell will work with his 1520. The load cell will can take a maximum 20 VDC excitation and outputs 2 mV/V.

[Ken_S]

Hello,

The 1314 should have no problems with a 700 ohm full bridge load cell. The module can supply 0-10V of excitation to the load cell when using an SCXI-1314 terminal block attached to the 1520. Since this is a full bridge sensor, there isn�t even any need to change any bridge completion resistors inside the 1314, so it should just be a matter of wiring up the inputs and excitation outputs to the sensor.

I hope this helps! Please let me know if there is anything I can help with or clarify.

Ken S.
Applications Engineering
National Instruments

[sfjd]

I have a similar problem with 1520 and SCXI 1314 terminal block. I connected one load cell of max capacity 200 kg(f) but not able to get any signal. What ever signal it shows is some drifting fluctuating signals. I configured it using both analog voltage input as well as analogue strain input. Still does not work (using MAX).

[Abhinav T]

Hi,

What kind of fluctuations are you seeing? Is the excitation coming from the 1314 correct? Have you tried using a different module?

Abhinav T.
Applications Engineer
National Instruments

[sfjd]

Hi,

I am also using SCXI -1315 for LVDT. It is working properly. The only problem is with 1314 block which gives some random signals only.

[Abhinav T]

Hi,

Can you verify that the voltage coming out of the thermocouple is correct? You can do this by measuring across the thermocouple using a hand held multimeter. You may also want to input a known voltage into the module (a simple battery would suffice) and see if this produces the correct voltage in Measurement and Automation Explorer.

Abhinav T.

[sfjd]

Hi,

I have verified that the load cell is working properly using a mutimeter before posting to this thread. What it gives is some fluctuating signals with ever increasing values.

[Abhinav T]

Can you try connecting a known voltage such as a battery to the S+ and S- inputs of the 1314 and see if this voltage is displayed correctly?

Abhinav