Help: PCI 1410 cannot accept non-standard signal

[xipeng]

Hi,

     I'm examining the non-standard signal imaging capability of the 1410 card. However when I feed the board with HSYNC of 10KHz TTL(from a signal generator), VSYNC of 25Hz TTL(from PCI-6251 DAQ), and signal of a constant 1.2V, I get nothing but a black image. I tried different signal values and other waveforms but it doesn't work. I'm using the "External H lock mode" in this case.

     When I feed a 10MHz pixel clock onto it and use the "External lock mode", it can't work neither.

     But interestingly, when I connect a 10KHz sawtooth signal from the same signal generator (the 10KHz TTL HSYNC is its SYNC signal), sometimes it will give me a grayscale image more or less as expected, although not stable. But, the grayscale value is only max ~140 for 1.4V(see bw1_4V.png), and can only reach 255 when the intensity is set to 3V (see bw_3V.png).

     And after a while (within 10 seconds) it will always pops up the error message 0xBFF60022.

     Do you think that the hardware is malfunction or I should check something else?

     Thank you!

Sincerely,
Peng Xi
Ph. D.    Associate Professor
Institute for Laser Medicine and Biophotonics
Shanghai Jiao Tong University
800 Dongchuan Rd.
Shanghai 200240, China
Tel: (86) 21-3420-4076
Email: xipeng@sjtu.edu.cn
http://biophotonics.sjtu.edu.cn/xipeng/

帖子被xipeng在 06-04-2009 05:59 AM

时编辑过了

[xipeng]

With the help from a Chinese NI engineer Jiaoquan Mao, we found that when using PCI-1410's default HSYNC frequency 15734Hz, everything seems fine, and the error message rarely comes. I have attached three images with: (1) the same 15734Hz sawtooth signal (15.7.png);

(2) on the 31K signal one should expect two periods of grayscale change (31.4_0.png);

(3) when I connect the APD it also reflects the light level with grayscale change.

But, when I change the frequency to 10KHz, (1) if I modify the camra file to replace all the 15734 with 10000, the error message pops again. (2) if I don't modify the camera file (by default it is 15734),  the response seem to have a 2 second delay from my action (on-off the light), and then the error message pops. Can anyone give me a hint on this? I think the PCI-1410 should be able to accept other frequencies; this is very important to my system design.

Thank you!

Sincerely,
Peng Xi
Ph. D.    Associate Professor
Institute for Laser Medicine and Biophotonics
Shanghai Jiao Tong University
800 Dongchuan Rd.
Shanghai 200240, China
Tel: (86) 21-3420-4076
Email: xipeng@sjtu.edu.cn
http://biophotonics.sjtu.edu.cn/xipeng/

[cgraf]

Hi,

Would you mind posting your camera file that you're using? The camera file has some settings that affect whether the 1410 configures the HSYNC/VSYNC/PCLK signals as RS-422 or TTL.  You mentioned that you're using TTL for all of these signal, so I'd just like to confirm that the camera file is also configured to use TTL.

One other question:  When you wired up the HSYNC signal, did you connect to both the  HSYNC+ and HSYNC- terminals?  When driving HSYNC/VSYNC/PCLK as TTL signals, NI recommends that you only connect to the (+) terminal and leave the (-) terminal unconnected.

Thanks,

Chris

[xipeng]

Hi Chris,

    Thank you for your reply. We have used the IMAQ-A6822 terminal clock to connect the channels. I'll double check how the (+) and (-) HSYNC is configured.

    Attached is our camera file for External HSYNC connection with a 15.734KHz HSYNC TTL input. I think this should be changable; but each time we change it to 10KHz some problems are generated as I mentioned in the previous thread..

    Thank you!

Peng