Sync module NI 9205 with NOR-9234

Hello

I have a cDAQ-9178 chassis with 4 x accelerometers IEPE PCB 16 absorbent of NOR-9234 (DSA). I have a NOR-9205 I intend to use to acquire the power of 4 problems. The NI - 9234 s are synchronized through their extensions in a single task. I would add the NOR-9205 to the chassis and synchronize it with the NOR - 9234 s. I have the following questions:

1. Calendar synchronization

How to properly START and the NOR-9205 CLOCK synchronization with the NOR - 9234 s? PXI I export the master St DSA. WHICH device (OR-9234 or NOR-9205) should export WHICH signals to WHOM?

2. even or parallel task

Since I produce a TDMS file in its task of NOR - 9234, it would be nice if I could simply to ADD the OR-9205 to this task to develop this unique TDMS with extra 4 channels of the NOR-9205 file. Is this possible?

Thanks in advance,

Hi golubovski,

> Are you saying my task of canal expansion can fire them OR - s and NEITHER-9205 9234 with its 32 channels of multuplexed HAVE? How to recognize which modules can be combined in this way convinient?

Yes. With the cDAQ-9178, any set of AI modules can be included in the same task and in most cases that apply to the AO and DIO as well, but you cannot mix a, AO and DIO in the same spot. The NOR cDAQ-917 x manual goes into more details on what combinations of modules, the types of channels and the tasks are possible.

> I am aware since I worked so far with the PXI - 4472 DSAS. How well can correlate between the NI 9234 - and the NI9205?

Well, I wanted to make sure that you did not know that it is something that you'll probably need to take into account. On the top of my head, I don't know the answer to this question.

> As far as I know, in which case I use dummy DAQ with the NOR - 9234 to offset 40 clock cycles I guess I'll need to separate the tasks - how to integrate viewers into a single stream of TDMS?

If you use two separate tasks and you are using the built-in support of DAQmx for TDMS logging, then you will get flow TDMS separated for each task. Note that a dummy read will still record to the PDM file, then maybe it will not work in your case.

If you use the TDMS API to write to the PDM file, you can do the preliminary processing of data before it is written in a single stream, but there is some trade-off between ease of use and efficiency: either you write data point floating in the file (easier but less effective), or you have to deal with scaling (most effective raw data (, but harder to do).

Another approach is to put all the modules in the same task and compensate for the delay of the filter after reading the data from the PDM file.

> Also, for fixed 3.2 µs I have to calculate how many cycles given the actual sampling frequency or is there another method?

If you filter delay compensation by removing a whole number of data samples, then Yes. However, there are other methods of data processing that can compensate for a number that is not part of the sample clock periods. I don't have a recommendation, but maybe someone else does?

Brad

Tags: NI Hardware

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Sync module NI 9205 with NOR-9234

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