Jim Luby

All, The AD3 features list describes the two analog waveform generators as +/-5 volt outputs. I’ve not been ableto find associated information on current capabilities or limits for these channels. I’d like to know the maximum current available on both AWG output channels and whether the device imposes a current limit on these outputs. I’d like to drive two wire coils, one per channel. As the resistance of coils is very small I’m concerned with damaging the output hardware. If I know the current limit I’ll add resistanceto limit the output current to a safe range. Thanks! Jim

@attila Hi Attila - Thank you for your earlier helpful response. I've been following the exchange between @zygot and @JColvin regarding A/D sampling, etc. In a recent post made by @JColvin he mentions there being the option to decimate - i.e,. "(only record Nth A/D conversion and "throw away" the rest)". Am I correct that low pass filtering is applied prior to throwing out samples so as to prevent aliasing? Thanks again! - Jim

@JColvin Thank you so much for providing such a detailed, helpful response to my question. I'm a very new user of the Analog Discovery 3 device, having received it just three days ago. I do have another question that I'm hoping you can shed some light on. Specifically, do the various "apps" within Waveforms interact or can I view them as independent? So, for example, do parameter settings in the Scope app result in limitations (for lack of a better word) in other apps such as the Spectrum analyzer? As to my use of the word "digitizing of the signals," I meant analog-to-digital conversion. I'm especially interested in knowing if I were to digitize two channels of data with the device, would there be any time offset between the channels introduced by the sampling scheme. I work with acoustic systems (e.g., sonar) and we often look at channel-to-channel processing methods for such things as estimating direction-of-arrival (DOA) of received signals. If the digitizing scheme were to introduce a delay between two channels of acoustic data it would appear as if the signal was arriving from a different angle than it actually is arriving from. So, in short, I'd like to know (and will test once I'm more familiar with the Discovery 3) if I were to feed an identical signal into two channels and then cross-correlate them, would the peak of the cross-correlation function be at zero time delay. Thanks again for your very thoughtful response. Best regards, Jim

Hello, I'm mentoring undergraduate students in underwater acoustics and would like to use my recently acquired Analog Discovery 3 module as a digitizer. I opened up the Logger capability within Waveforms and see that the minimum sample rate is presently set to 50 Ms/s. I'm wondering if this is a hardware limit (i.e., the board simply cannot sample at lower rates) or whether it might be possible in a future software release to run the board at sample rates as low as 100 kS/s. Ideally, I'd like to use the module to digitize two analog channels coherently (i.e., simultaneous sample/hold). Even better would be the capability to trigger the module and have it collect two channels of data for a fixed period of time. This would allow me and my students to use the module as a two channel A/D converter. I've looked for affordable (in an education environment) USB multi-channel A/D modules but most cost several thousand dollars and are out of reach of our budget. Thanks! Jim Luby