Acquisition of NOR-6602 delay and buffer overflow

Hello world

I use an NI PCI-6602 to record photon arrival times. Basically, it counts the number of rising edges on the sample clock 80 MHz which occur between two rising
edges on the photon TTL signal. The array of integers can be converted at a time by multiplying by 12.5ns. Please find my VI for the task and its attached Subvi.

I have two problems:
(1) I want to do this same measure for two photon detector channels. I've set up two independent channels. My goal is to correlate the signals with a gap between them. I am able to implement a delay in the software, but my data there seems to be a small inherent delay between the start of each channel.
The amount of the delay is seemingly random and occurs in the positive and negative direction. In VI I joined, I tried to use the start of arms in order to get both channels to start acquiring at the same time, but this reduces the severity of the delay, it has not removed completely. There is always a delay of 1 to 500 microseconds. I have implemented the trigger arm to start properly, or there at - it another way to solve this?

(2) I get an error message indicating that "the data has been overwritten before it can be read by the system. The number of samples that have been collected before this error varies and also varies between the counters on the Board. I had a theory that the transfer of sample rate was not good enough, but according to the manual, the transfer rate should be approximately 2000kS/s. It is more than enough as the photon count rate is less than 50 k/s. The PC that I use has a PCI graphics card too. Is it possible that is to limit the frequency of sampling? Here are the specs of PC: processor Intel Pentium D (3.0 GHz), 2 GB of RAM, nVidia GeForce 7300 graphics THE.

Thanks in advance.

Hi James,

I think you might be interchanging the words "metering" and "sampling".

The counting begins with the relaxation of beginning of arm, which should be at the same time for both channels (with perhaps a shift of 1 tick, who would be 12.5 ns on the 6602). Count refers to increment the register of account of material at each tick of the input terminal (80 MHz base time in your case).

Sampling of the account register will take place at different times on each dependent channel when the photons are detected. So the temporal measures on each channel will be different, but if a photon should occur on each channel at the exact time you would get an identical timestamp on each channel for a sample. Sampling refers to the value of the register count in a buffer you can lock read later in the software.

This image (from theM-series user manual actually, but the 6602 should work the same way) watch your use case:

The time that the meter is armed is identical between the chains, so each counter at some point value would be equal. The time sample clock are not identical on each channel, so locked into the buffer values don't would not the same.

Using the same external signal to sample some registers simultaneously count shows that relaxation of arm early works (in other words, if you give the same sample clock counters, you get the same results). If the beginning of the arms did not work, you will see different results on each counter even with a same sample clock (the sample clock not to arm the meter). Out the relaxation of beginning of arm would confirm this point - arm tasks in the software (which is what happens with no beginning configured trigger arm) will give unpredictable delay between each task starts - you will see a difference between the channels, even with a sample clock shared.

Looks like the problem is that you could have if wait photons occur on the two separate channels at most close at the same time? You can try out photon detector to confirm whether or not there is a current backlog of the scope. Looks like it is - but this isn't what you're trying to measure? Expect photons to be detected by each channel exactly at the same time?

Best regards

Tags: NI Hardware

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