First of all thank you very much for all the answers in the forum questions they helped me out a lot!
I am trying to continuously measure the logic levels using the acquisition mode scanScreen currently at a sampling frequency of 800000. During this process I came across some questions I unfortunately did not find any answers to. I am not using the record feature as this is limited to 100ms/div in Waveforms. Is this because it can't get higher?
After that I wanted to mimic the repeated acquisition mode. I tried using 10 buffers and then constantly reading and rearming the device. This unfortunately has sometimes some data loss as well, which makes we wonder how the repeated acquisition in Waveform works?
I ended up storing the old index position and acquiring the new one using FDwfDigitalInStatusIndexWrite. I am able to get the new data every round. However sometimes if the background activity is to high presumably there is some data missing. Is there a way other than guessing from the amount that has to be read every single time that can tell me when this happens eg. receiving the amount of samples written after the buffer was last read?
I've already tried:
1) FDwfDigitalInStatusSamplesValid this always returns 4096. At the beginning using the shift Acquisition mode this counts up however unfortunately I did not find a way to get by how much the shift register was shifted.
2) FDwfDigitalInStatusSamplesLeft this function, if I did not misunderstand how to use it, constantly returns a growing negative value seemingly unrelated to the growing buffer.
Question
joeck
Hello,
First of all thank you very much for all the answers in the forum questions they helped me out a lot!
I am trying to continuously measure the logic levels using the acquisition mode scanScreen currently at a sampling frequency of 800000. During this process I came across some questions I unfortunately did not find any answers to. I am not using the record feature as this is limited to 100ms/div in Waveforms. Is this because it can't get higher?
After that I wanted to mimic the repeated acquisition mode. I tried using 10 buffers and then constantly reading and rearming the device. This unfortunately has sometimes some data loss as well, which makes we wonder how the repeated acquisition in Waveform works?
I ended up storing the old index position and acquiring the new one using FDwfDigitalInStatusIndexWrite. I am able to get the new data every round. However sometimes if the background activity is to high presumably there is some data missing. Is there a way other than guessing from the amount that has to be read every single time that can tell me when this happens eg. receiving the amount of samples written after the buffer was last read?
I've already tried:
1) FDwfDigitalInStatusSamplesValid this always returns 4096. At the beginning using the shift Acquisition mode this counts up however unfortunately I did not find a way to get by how much the shift register was shifted.
2) FDwfDigitalInStatusSamplesLeft this function, if I did not misunderstand how to use it, constantly returns a growing negative value seemingly unrelated to the growing buffer.
cValid = ctypes.c_int() dwf.FDwfDigitalInStatusSamplesValid(device_handle, ctypes.byref(cValid)) print(cValid)Thanks in advance.
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