scc sg04: can the excitation voltage value be change?

[flory]

Hello everyone!

I have a question if someone can and is willing to help me.

Im using a DAQ system connecting a SCC SG04 to SCC68 for acquiring data from 2 pressure transducers. The excitation voltage provided by SCC-SG04 is 2.5V, but the pressure transducers only require maximum 1V. I was trying to modify from DAQ Assistant the value of the excitation to 1V but Im receiving errors (200077) from DAQ Ass. Could you tell me please if there is a way to change the excitation voltage as to each of the sensors to receive 1V? Is this value of voltage 2.5V a constant for this type of signal conditioning?

Thank you very much and I would appreciate your help!

Regards,

Flory

[BeejalS]

Hi Flory

This 2.5V is the built in excitation voltage and cannot be changed for that device. The 2.5V is not the voltage that is output from the module. The link below should help you to configure the device.

http://www.ni.com/pdf/manuals/371073b.pdf

The configuration and Using the SCC-SGXX sections should be useful.

Let me know how you get on.

Regards

Beejal

[flory]

hello,

Sorry for the late reply and thank for answering my post.

I'm measuring pressure from the sensors connected to SG04. Im mistaking to consider that the formulas of conversion are those detailed in the doc below?

http://zone.ni.com/devzone/cda/tut/p/id/3639

Thank you!

Regards,

Flory

[BeejalS]

Hi Flory

I have done some more research into you problem. The tutorial you were looking at is correct. However the SCC module that you are using has a built in excitation voltage of 2.5V and this cannot be changed through MAX.

I can suggest two options:

1) Connect a potential divider to the excitation voltage terminals of the module to reduce the voltage.

2) Connect an external power supply to your pressure sensor to provide the excitation voltage. Then use the SCC module to read the voltage output from the sensor.

Regards

Beejal

[flory]

Hi Beejal,

Thanks for your suggestions! That was really helpful in clarifying the situation.

Regards,

Flory