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From Friday, April 19th (11:00 PM CDT) through Saturday, April 20th (2:00 PM CDT), 2024, ni.com will undergo system upgrades that may result in temporary service interruption.
We appreciate your patience as we improve our online experience.
11-23-2015 05:18 AM
Hello,
12-16-2015 07:35 AM
Hello,
can I ask you if you are using LabVIEW to acquire data?
Regards.
12-16-2015 07:44 AM
Hello,
yes I'm using LabVIEW.
12-16-2015 07:54 AM
Hi Francesca,
could you be more precise about what hardware configuration you're using? Is the gaussmeter the only piece of hardware present? How is your system intended to interact with NI software?
Regards
12-16-2015 09:53 AM
12-17-2015 05:15 AM
The DSP 457 gaussmeter is connected to the computer by serial interface and receives data from a hall probe inside a bending magnet.
I'm using LabVIEW to acquire field measurements but I want to use a trigger input to start the aquisition in order to synchronize it with the timing of my sperimental setup.
This gaussmeter has the possibility to do it, user's manual says that "a TTL-level hardware trigger into the instrument can be used to initiate the data log sequence". I connected a manual trigger to the Auxiliary I/O connector of the gaussmeter: when I press the botton it generates the trigger input signal to start the acquisition.
I modified the acquisition program by using the *TRG command that I found in the interface command list: *TRG represents the trigger event and starts the datalog capture mode. I used it instead of the DLOG command (user's manual says they are equivalent) but it's not working: it seems that the trigger signal input is not received, so that data acquisition starts independently of it.
There aren't other commands related to trigger events and I couldn't find any example about it in the lsci475 library.
12-17-2015 06:04 AM
12-17-2015 10:12 AM
I apologize if I can't explain properly the problem but I never done something like this before.
I would like that the gaussmeter started the field acquisition only when it recieves an external trigger signal by Auxiliary I/O connector: now i'm using a manual trigger just to try, but in the final setup it will be a timing signal coming from other instruments of the system.
I think I don't need to generate a software trigger because the trigger signal already exists, I only want that the instrument detects it and then starts the data acquisition.
I supposed *TRG was the command to tell the gaussmeter to start acquiring under the condition of having received the trigger signal, not the command to create a new software trigger.
12-17-2015 10:34 AM