hugocoolens

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Everything posted by hugocoolens

  1. Thanks for taking the time to answer my question. From the first part of your answer I conclude that the frequency as such is of no importance for the magnitude (dB) measurement uncertainty. Would it be possible to provide a numerical example of the amplitude- and phase measurement uncertainty using the above data? thanks in advance Hugo
  2. Setting the trigger mode to Normal solved the problem. Thanks a lot. kind regards, Hugo
  3. I have trouble correctly triggering signals below typically 0.5Hz. From 0.5Hz and upwards, the WaveForms scope triggers correctly, however below 0.5Hz, the trigger point is unpredictable. What can be the reason for this and is there a workaround for it? kind regards, Hugo
  4. Thanks for answering Sergiu, I placed the bead at the Analog Discovery bead and the problem does not disappear. Unfortunately I can't load up the "scope screen file" to show what is happening. I made the file directly with the WaveForms export menu. It's a png-file, only 68k large, but I always get the message: "There was a problem processing the uploaded file. Please contact us for assistance. "
  5. As I am having trouble with noise when using the analog discovery I'd like to use the ferrite clamp which came with it. Which is the preferred placement? Close to the module itself, close the the computer, elsewhere? thanks in advance Hugo
  6. I have purchased the new Discovery 2 and installed WaveForms 2015. I'm trying to change a voltage at the input of a circuit from -2 to +2V in 10 seconds and measure the output voltage, then put the data in a csv-file, the idea is to plot U_O=f(U_I) (I'm not interested in the timepoints). I tried applying a triangular voltage and measuring input and output but I find it very hard to make my data (which I export in a csv-file) starting at -2V exactly and stopping a +2V exactly, I have to fiddle constantly with the trigger point and the zero position and have to edit the csv-file in the end myself. I also noticed the add XY function, that gives indeed a nice plot of U_O=f(U_I), but I'm interested in the data of only the XY-plot not in the data of the scope in Y-t format. Is there a way to only export the XY-data? In fact all I need is a kind of script which performs one voltage sweep from -2 to +2 in 10s and measures channel 1 and 2 and puts the data in a csv-file. Could someone explain me how to accomplish this with the new software? thanks in advance and kind regards, hugo
  7. ​thanks this works like a charm under linux (no drive-letters needed ;-) hugo
  8. ​Is it possible to write the output data to a file? regards, hugo
  9. ​I noticed there was something wrong with the brackets in the last print statement: Here is a corrected version: print(hz +"\t"+ Math.log(Scope1.Channel2.measure("Amplitude")/Scope1.Channel1.measure("Amplitude"))/Math.LN10*20) kind regards, Hugo
  10. Thanks, ​I found 'add channel', it works very well, just wondering why this is limited to 8 runs... kind regards, hugo
  11. To check the quality of my measurements I'd like to repeat a bodeplot sweep e.g. 100 times, I'd like to use the data of those sweeps to determine their mean and standard deviation. I wonder whether there is something built in in WaveForms 3 for this kind of repeated measurements? kind regards, hugo
  12. ​Oh, now I see what you mean, I'll do my homework from now on thanks again for all the help hugo
  13. ​thanks,I thought it was like you explained here above, but just wanted to be sure 100% kind regards, hugo
  14. ​Could clarify what you mean by "mark the answers"? Is this the same as clicking on "You like this"? hugo
  15. ​until now, for me it works fine under debian wheezy, it's just the error when installing it which made me wondering whether I might expect trouble when using it regards, hugo
  16. I'm measuring a bodeplot for which I have set "use channel 1 as reference". I then export the data as a cvs-file and I see the dB-data in column 2 and 3 as expected. I'm wondering now whether I have to substract the dB-values in column 2 from column 3 to get the real voltage transfer characteristic of the system or are the value in column 3 already "corrected" as such? regards, hugo
  17. ​OK, I understand this, but it seems to work correctly under debian wheezy, should I expect problems? kind regards, hugo
  18. A few months ago I got an example of a batch script which ran fine under Waveforms 2. As I understand Waveforms 3 has a new scripting language. Could anyone here help me converting the old script (see below and attachment) to the new syntax? WaveGen.1.Mode = "Basic" WaveGen.1.Basic.Amplitude = 1 WaveGen.1.Basic.Offset= 0 WaveGen.1.Run Scope.Channels.C1.Range = 2 Scope.Channels.C1.Offset = 0 Scope.Channels.C2.Range = 2 Scope.Channels.C2.Offset = 0 echo("Scope1-Input(Hz) (V)\tScope2-Output(Hz) (V)") var hzStart = 1e3 var hzStop = 5e6 var steps = 100 var mul = Pow(10, (Lg(hzStop/hzStart)/(steps-1))) var hz = hzStart for i=1:1:steps WaveGen.1.Basic.Frequency = hz // time base = number of periods to capture / frequency Scope.Time.Base = 10/hz // wait between changing the frequency and acquisition Sleep(10) // 10ms Scope.Run Scope.Wait //echo(i+"\t"+hz +"\t"+ Scope.Measure.C1.Amplitude+"\t"+ Scope.Measure.C2.Amplitude ) echo(hz +"\t"+ Log((Scope.Measure.C2.Amplitude/Scope.Measure.C1.Amplitude),10)*20) hz *= mul end kind regards, hugo bode_amplitude.dwfbat
  19. I just installed WaveForms 3.0.25 (digilent.waveforms_3.0.25_i386.deb) under Debian Wheezy and I get the following error: dpkg: dependency problems prevent configuration of digilent.waveforms: digilent.waveforms depends on libc6 (>= 2.14); however: Version of libc6:i386 on system is 2.13-38+deb7u8. Is there a solution for this without having to reinstall the whole operating system or using chroot/docker like solutions? strange enough waveforms _does_ work despite this error message kind regards, hugo p.s. a big thanks for making the software available for linux users
  20. Sorry, but I still don't get it. More questions pop up: 1. I thought the Analog Discovery had only two gain settings "1:1 or 1:10" and this is achieved by an attenuator in the circuit. MaxGain doesn't seem to be related to these two settings? 2. As there are _two_ channels, how then can you achieve best performance with _one_ MaxGain setting 3. Should the user try to present 4Vptp signals to the internal ADCs for best performance 4. Is MaxGain just a software multiplication? Maybe some examples could clearify the use of MaxGain: e.g. I have on channel 1 a 200mVptp signal and on channel 2 I expect a signal which will be max. 3Vptp, how do I calculate the best setting for MaxGain in this situation thanks in advance hugo
  21. I'm using the Discovery, do I understand it correctly I should use e.g. a MaxGain-setting of 10 if I expect the output signal amplitude to be less then or equal to 200mV? kind regards, hugo
  22. That's really a nice feature, maybe I'm asking too much but I wonder if it is also possible to export the latest run together with the one of the snaphot? kind regards, hugo
  23. I'm a bit confused about use and internals of the MaxGain field when running the Network Analyser: 1. Does it change the accuracy of the plots made by the analyser? 2. When I have entered the values for the Bode Scale Top and Range, what's the use then of entering a value for MaxGain? could someone clarify this? thanks in advance hugo