NI9237 measurements fluctuate

[RyanWu]

Hi Margaret,

     The R4 is 709 kOhm, and R3 is 6.98 kOhm. I connected the resistors differently than you did in the attached image. I didn't have the two green (SC) wires. Plus I connected another side of R3 (opposite to the red wire) to AI-.

Thanks,

Ryan 

[Margaret F.]

Hi Ryan,

I really need to know what kind of accessory you have connected to the 9237 that's allowing you to wire into it. Please let me know this. Thanks!

[RyanWu]

Hi Margaret,

    I  used the RJ50 with the appropriate cable to wire into 9237.

Thanks,

Ryan

[Margaret F.]

Hi Ryan,

I am going to try to recreate your setup here. Out of curiosity, are there any temperature changes in your enviroment? Also, is there any fluctuation in your resistance values?

[RyanWu]

Hi Margaret,

     No dramatic changes of temperature in my environment (maintained at room temp by a window A/C) and I used fixed resistors for the test.

Thanks,

Ryan

[Margaret F.]

Hi Ryan,

Thanks for the info. I will be setting up the hardware tomorrow and will post my findings. Have a great day!

[Margaret F.]

Hi Ryan,

I setup a half bridge configuration today with AI+. EX+. and EX- connected as in the picture I have previously attached. I did not connect SC. I did not see the periodic noise that you are seeing. I am still unsure where this is coming from.

I am assuming that you are using a voltage with custom excitation task where you are specifying 2.5V excitation. Do you have any other modules in your chassis. If so, please remove them and isolate the 9237 by itelf in the chassis. Also, I'm not sure if you're doing multiple channels, but please try only using one. 

Message Edited by Margaret F. on 05-20-2009 04:42 PM

Message Edited by Margaret F. on 05-20-2009 04:42 PM

Message Edited by Margaret F. on 05-20-2009 04:43 PM

[RyanWu]

Hi Margaret,

    I will try it next week and send feed back to you.

Ryan

[jyothi prasad]

sir

i am using kistler load cell with range 1.11kN and sensitivity 4 mV/N.
my kister load cell type:9712B250.the out put of the load cell have to be taken through BNC connector and that should be connected to NI 9237 via RJ50.my problem is RJ50 had 10pins and BNC connector has two pins,now to which pins in RJ50, BNC connector to be connected.

[Dennis_Knutson]

duplicate post

Do NOT post the same question in  multiple threads and to multiple boards.