SCXI 1126 frequency channels are unstable when two or more are connected.

I have two proximity sensors picking up the spoke of a pully wired into my SCXI-1126 module. The signal jumps around a lot while both are working. When only one is sensing and the other is not the signal works good without any problems. It seems like I am getting cross talk between the two channels. This is not the first time I've used an 1126 module. I've done it in other applications with similar sensors without problems. Could it be the type of prox switch I'm using? I've got two omron npn sensors. Is there something else that I am overlooking.

Thanks mtdtest. Revision D is a slightly older version of the board, and this may be related to the issue you are seeing. You'll need to contact technical support to continue troubleshooting this issue. You can create a service request online by going to the Request Support page and entering in your information. Once you create your request, can you please post your service request number here so I can follow the issue as well? Thanks!
Justin M.
National Instruments

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Scxi 1126 frequency measurement along with other scxi modules

I want to measure frequency signal using sxci 1126. I have gone through the example code for sxci 1126. I am using NI-DAQ and Labview 7.1.
The example code is applicable when am acquiring only from 1126. I have to acquire data also from 1102 102B along with 1126.
In the example code along with AI config.vi and Ai Start.vi there are two additional vi's like AI paramete.vi and AI Trigger config.vi I understand that they are used for reading from 1126. My worry is how this is going to affect my acquisition from other scxi modules as all the modules are in multiplexed mode.

Hi Bipin,
Looking at your code, I see that you are still using Traditional DAQ. Since you have LV 7.1, you can take advantage of the new features of DAQmx.
With DAQmx, you can create a virtual task that includes all of the different types of measurements you want to make. Once you set up the task in MAX, you can place it on the block diagram and automatically generate the code necessary to execute this.
To do this, open up the Measurement and Automation Exlporer (MAX). Select "Data Neighborhood" from the tree on the left. Then click the button labeled "Create New." Create a DAQmx Virtual Channel. Follow the series of menus to set up your first type of acquisition (1126 frequency measurement). When you are
done creating the task, you can add the second type of measurement to that same task. In the task config page, you will see a white box with the name of the channel you just created in it. Above the name you will see an "Add" button. Click on this button and follow the menus to set up your second measurement (1102 module).
Once they are set up, save the task and open LabVIEW. Place the DAQmx Task Name constant on your block diagram found in All Functions >> Data Acquisition >> DAQmx... the task name constant is a purple colored box. Clicking on the box once its on the block diagram will expand a menu that will let you choose your task. Once selected, right click on the task name and choose Generate Code >> Example. This will automatically generate the code necessary to run the tasks. Simply hit the run button and enjoy!
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I am taking these measurments using the measurment and automation explorer test function. I set my range on all channels to 0-8khz and Have been inputing no more than 8khz. What leads me to believe I have a software or config problem is that I sent in a module to NI for repair and this is the brand new one they sent me back. While testing this module, I also have a 1102 module and 1124 module on the scxi-1000 chasis and both of those are working as specified. I also moved the 1126 module to slot 1 and ran it that way as well when I replaced the chasis.

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What are acceptable measurement fluctuations for the SCXI-1126?

Greetings,
We are using an scxi-1126 module in a PXI-1011 chassis. The range for channel 0 is set at 2 kHz. The channel is configured for a threshold voltage of 0.1 with a hysterisis of 0.05. We are injecting a 1 kHz sinewave, 800 mV pp signal into the channel. The SCXI-1126 reading is fluctuating by as much as 0.6 Hz at all frequencies (below 2k). We have tried changing the window, signal levels and various other suggestions from the NI website with no success. Should the reading be more stable or are the fluctuations the result of the F-V conversion process? Any suggestions would be much appreciated.

Hello,
Please look at the Specifications section of the SCXI-1126 User Manual (pg. A-3) at the following link:
http://www.ni.com/pdf/manuals/321844c.pdf
From the Accuracy Table for a 2 kHz range, the accuracy a year after purchase should be 0.0418% ± 0.308 Hz. Which for a 1000 Hz signal would be 1000 * 0.000418 + 0.308 Hz = 0.726 Hz in the worst case. 0.6 Hz would fall within the spec'd range.
Let me know if you have any further questions.
Sincerely,
Sean C.

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If the value of the Action is STOP then the stop action should be performed.
For this I have implemented two mappings and condition is being given in Interface determination
so as to have the splitting of messages when the start action is performed.
Can anyone suggest me how to implement this by using a single mapping or this could be achieved only through BPM?
Thanks in Advance,
Lavanya .B
Edited by: Lavanya Balanandham on Aug 4, 2010 2:24 PM

Hi ,
My requirement is ,I need to merge two mappings into one mapping without using BPM.
My File to File scenario communication channel is controlled externally by using Proxy-to-Http scenario.
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SCXI 1126 frequency channels are unstable when two or more are connected.

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