Gary Rubin

Because of the onboard FIFO of the card, if the code interface calls are set up properly, while the acquisition is occurring your PC should have a little "free time" on its hands to try to accomplish tasks.

My experience with Gage (I was using a CS14200 board) is that they do not do double-buffering in their FIFO, like most A/D cards do. As a result, you cannot acquire data while you are busy offloading. This means that your acquisition software loop has to be MUCH leaner than with most A/D cards. I don't have the documentation with any more (it was delivered to the customer along with the system), but my recollection is that there was a graph somewhere which showed maximum PRF for a given sample rate and sample length. Of course, this would be a little different using the multiple-record feature.

I also found that the Labview drivers that you can get from Gage were simply calling some pre-compiled higher-level functions. These were quite slow. I used my own calls to the DLL to DMA the data and rearm the card.

The other weird thing I found (again, this was with the CS14200 board), is that it would always give me 12 more samples than I asked for.

I hope this is helpful.

Gary

You know, I've never thought of that -- Making a custom probe gives you a boolean out to allow for a conditional probe style.

Jeff, you don't even have to do it that way. Maybe this was what Michael was refering to... There's a probes directory in vi.lib where the conditional probes live as vi's. Modify one of them (say the I32 to be an I16), and then select it as your custom probe. Now you have a conditional I16 probe. No need to use a boolean conditional probe on another custom probe (if I'm understanding you correctly).

Gary

Anytime I want a conditional probe on a numeric which isn't I32/U32/DBL I normally split the wire and convert the offshoot to DBL and then make that wire go to a structure (which I don't use) and use a conditional probe on that one new DBL wire.

Thanks,

That's what I've been doing too. It would just be nice to not have to clutter up the diagram like that...

Gary

Does anybody know why condional probes are available for U32, I32, and Double wires, but not for other data types? Does this limitation still exist in LV8?

Thanks,

Gary

What seems to be the symptom? Are you missing triggers? Overflowing a buffer on the board?

I agree that it would help to know which board you're using. Does it have an onboard FIFO for data acquisition and transfer?

Gary

Hi folks,

I'm trying to plot some points (timestamp vs values) by using XYGraph control. So far I'm able to plot different plots over the same XYGraph control. The problem comes when I have to play with Y scales cause some parameters have values between 0 and 1 but other ones have values between 0 and 100.

My question is if there is any possibility to tell XYGraph control that every plot has its own scale in terms of I could see graphically for example 3 different scales if I have 3 plots over the XYGraph.

Thanks in advance for your support.

Jose.

Yes, right-click on the y-axis on your X-Y graph and select "Duplicate Scale". Show and expand your Plot Legend so that it shows all of your plots. Right click on each plot, select Y-Scale, and then select which Y scale you want that plot to be associated with. This also works on waveform graphs.