1405 acquisition problem

[yoasis]

Hello,

I am using a NI-PCI 1405 acquisition board, with a watec 902B camera (RS170 standard).

When I am acquiring, I have horizontal noise stripes on the picture. These stripes are travelling from the bottom to the top of the picture during the acquisition. This happens whether I am using MAX or my own vis. In MAX, I am using the rs170 driver.I found the RS170(1409 and RS170(1410), but no drivers like RS170(1405). Could this be related ? Also, the cameras I am using are not in the list of official ni supported cameras, but since they work with the RS170 standard, I think that there should be no problem. You can find the specification about my cameras here.

Thanks.

[esmaham · Accepted solution]

Hi Yoasis,

Are you using shielded 75 ohms BNC cables? Do you see the same pattern on all cameras? Does the noise move within the same picture, or it's a constant line? Also, since you mentioned "cameras", do you have multiple 1405 boards as well? If so, do you see the same noise in all of them? 

Thanks and have a great day.

Esmail Hamdan | Applications Engineering | National Instruments

[yoasis]

Hi esmaham,

Your 75Ohms remark made me check my wiring circuit, and I found a bnc T-adapter with a non connected output. If I plug a 75Ohms terminator or just remove the T adapter, it works fine, without any noise or stripes.

Thanks a lot for your help.