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Atanas

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Everything posted by Atanas

  1. Hello, I wrote a Windows Python script for USB-205 DAQ, based on ULAI12.py example, which uses mcculw library. Now, I'd like to port it to Raspberry Pi and wonder which Python library shall I import under Linux. Also, I'd appreciate an advice about some relevant examples. Could you advise please? Thanks in advance, Atanas
  2. Thanks Jeffrey. I use external trigger on USB-250's TRIG input, and hope that the PC shouldn't be involved, since I first start the scan via DAQami's control and only afterwards I enable the trigger via an external circuitry. Thus, my question concerns the delay between the TRIG signal rising edge and the actual start of the scan. WRT the sample rate, I understand that there are certain limitation with the generation of the requested rate. I expect that when external clock is provided to AICKI input, that problem won't appear. Correct? Thanks. Atanas
  3. Thanks for the prompt replay, Jeffrey! I think, that the limitations posed by the USB-205 design are almost clear now. I still hope, that there could be a way to use the device for my purpose. I could capture the I and the Q data in 2 consecutive scans (those waveforms are constant/unmodulated and synchronous with the trigger). A necessary condition would be, that the delay between the trigger and the first sample is constant and known. Could you advise on that, please? Another question concerns the actually applied sample rate. I noticed, that sometimes it slightly differs from the entered value. Is there a way to prevent that in DAQami? Thank you in advance. Regards, Atanas
  4. Hello, I've purchased USB-205 daq, which I plan to use for acquiring IQ data. I'd like to sample the signals synchronously, applying external ADC clock and trigger. I tried to capture some data using DAQami (eval version). It appeared, however, that the SW doesn't provide an option for using the clock provided on the pacer input terminal AICKI . Could you advise, please, whether my observation is correct and whether options for circumventing that are available? (In the application, I plan to use a python script for capturing and processing the IQ data and hope, that that it won't be an issue.) I have also a question concerning the synchronicity of sampling when using 2 analog inputs. The attached screenshot shows one signal, sampled simultaneously by AI1 and AI0. It appears, that the signal on AI1 is delayed with 1 ADC clock cycle (SR=250kHz). I wonder whether the delay is determined by device's HW design, or can be prevented by applying a proper configuration. Thank you in advance. Regards, Atanas
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