Hi all,
I am currently assembling a manipulation to acquire an array of photodiode (about 300 columns by 1000 rows CMOS APS Pixels) according to “exotic” chronograms : time of latency between obturation/integration and reading of the image about 500ms to 2s, frequency of reading pixel = 30MHz.
My starting configuration is :
- no delay between integration and readout
- 30 MHz clock sample into CLK IN connector,
- Start Acquisition trigger into TRIG connector
In this configuration i basically acquire in one sequence from the first top-row pixel to the last bottom one : about 300 kSample which i reorder in a 2D array.
My problem is then the following: to insert delay between integration and readout, i use a pulse generator to start and stop my clock generator. By the way, when i pause the clock generator (not enough in-depth memory to generate the delay i need) , the clock sample is also paused and so the acquisition of the NI-5122 crash (Error: No clock sample).
So, is there a mean to configure the NI-5122 with a non-permanent clock sample ?Personally i've tried with an external 30 MHz clock generator but i can't synchronize it simultaneously with both my main clock generator and the NI-5122. I've also tried with a digital trigger on the PFI_0 as a Start trigger source but if the acquisition is well done, the start of it is unpredictable.
In the same idea, is it possible to start/stop the acquisition on a multiple trigger condition on a NI-5122? For example analog edge trigging on EXT TRIG
AND digital gate trigging on CH1 or PFI_0 .
Any suggestion is welcome
🙂Alex.
