Search found 276 matches

by hexamer
Mon Jul 26, 2021 11:46 pm
Forum: Getting Started
Topic: Spurious peak
Replies: 3
Views: 1959

Re: Spurious peak

I guess that will sort it? Generally, yes. Here's a good overview of the application of the FFT in the PicoScope's Spectrum Mode, including some good advice on how to pick FFT parameters: https://www.picotech.com/download/brochures/PT-012746-DO-2-AR501_Fast_Fourier_Transform_(FFT)_white_paper.pdf A...
by hexamer
Sun Jul 25, 2021 9:05 pm
Forum: Getting Started
Topic: Spurious peak
Replies: 3
Views: 1959

Re: Spurious peak

JC, It's probably just aliasing, which is to be expected if you have frequency content above half the FFT's sample rate. See this thread for examples and explanation: https://www.picotech.com/support/viewtopic.php?p=145832#p145832 If you could tell us about the frequency content of your signal, we c...
by hexamer
Sun Jul 25, 2021 8:55 pm
Forum: Applications
Topic: Frequency Response Analyzer with Bode Plots
Replies: 548
Views: 313369

Re: Frequency Response Analyzer with Bode Plots

Well, I'm happy you got it working :), but I can't really tell what was going on. I tried re-installing the SDK without PS6000a and ps6000 support, but can't get it to crash. Only other thing I can think of that may be relevant is what version of the Picoscope app you had installed. The FRA app is ...
by hexamer
Fri Apr 30, 2021 12:37 am
Forum: Applications
Topic: Frequency Response Analyzer with Bode Plots
Replies: 548
Views: 313369

Re: Frequency Response Analyzer with Bode Plots

Thanks hexamer for your points and opinions. I had previously read the thread you linked along with all of the links within it, however I wasn't sure what range of freq. was being attempted in that one. By the numbers it would seem that for 100Khz and below that the 2000 series should work with the...
by hexamer
Thu Apr 29, 2021 1:48 am
Forum: Applications
Topic: Frequency Response Analyzer with Bode Plots
Replies: 548
Views: 313369

Re: Frequency Response Analyzer with Bode Plots

I'm looking to do loop gain and phase Bode plots on SMPS with switching frequency 100Khz or less. Are the 2204A and 2205A capable of doing adequate FRA plots for the above scenario or is it necessary to go up to higher models with higher sample rates, memory depth, and resolution and if so what are...
by hexamer
Sat Apr 03, 2021 6:12 pm
Forum: MATLAB
Topic: Block mode measurements 5444D MSO
Replies: 1
Views: 1418

Re: Block mode measurements 5444D MSO

EDIT: I have a new guess as to what's happening here. It's possible that when the MSO device is opened, some of the digital ports are enabled. These count as channels too, so would lower your max sampling frequency. If this is the case, you need to explicitly disable them with code like this: https:...
by hexamer
Fri Apr 02, 2021 12:33 pm
Forum: USB PC Oscilloscopes
Topic: Spectrum Analyser Ghost Problem
Replies: 3
Views: 1597

Re: Spectrum Analyser Ghost Problem

Those "ghosts" are to be expected. They are called aliases. As Benno pointed out, your signal frequency is well above the Nyquist frequency of fs/2. I like to use this tool to show where aliases will occur: https://www.analog.com/en/design-center/interactive-design-tools/frequency-folding-tool.html ...
by hexamer
Tue Mar 30, 2021 1:50 am
Forum: Applications
Topic: Frequency Response Analyzer with Bode Plots
Replies: 548
Views: 313369

Re: Frequency Response Analyzer with Bode Plots

Dear Aaron, Thanks a lot ! I could managed to fix. When I installed PicoscopeSDK, I unselected Ps6000x devices. That seems to be the reason of this problem. First, I uninstall and re-install v0.7.3b of FRA4. -- nothing changed. Next, signed in as different user, and try -- same, no change. As to yo...
by hexamer
Mon Mar 29, 2021 12:32 pm
Forum: Applications
Topic: Frequency Response Analyzer with Bode Plots
Replies: 548
Views: 313369

Re: Frequency Response Analyzer with Bode Plots

Thank you, yosi, for reporting back. Since this:
yosi wrote:
Sat Mar 27, 2021 5:29 am
When I installed PicoscopeSDK, I unselected Ps6000x devices.
seems like a completely reasonable thing to do, I'll see if I can replicate. If I can, I'll work on improving the application so it doesn't crash and offers a better diagnostic.
by hexamer
Fri Mar 26, 2021 12:12 am
Forum: Projects
Topic: 24V logic analyzer
Replies: 3
Views: 1707

Re: 24V logic analyzer

Very nice! Great solder work! Did you reflow with paste or hand solder? I've started doing some manual reflow, but all I have is a hot air gun.
by hexamer
Thu Mar 25, 2021 2:05 am
Forum: Pre-Sales Advice
Topic: Help deciding on PicoScope for FRA for Switch-Mode PSUs
Replies: 7
Views: 2662

Re: Help deciding on PicoScope for FRA for Switch-Mode PSUs

Gerry is right ... For FRA, deep buffers, allowing high DFT sample count is about increasing processing gain (narrow bandwidth for signal selection and good noise rejection). For power supply stability analysis, there are cases where you need the stimulus signal to be small to keep the control loop ...
by hexamer
Tue Mar 23, 2021 11:45 pm
Forum: Applications
Topic: Frequency Response Analyzer with Bode Plots
Replies: 548
Views: 313369

Re: Frequency Response Analyzer with Bode Plots

yosi, Thank you for reporting this. I hope I can help. Here are a few thoughts: 1) I noticed that you say you installed v0.7.0b, whereas v0.7.3b is the version compatible with PicoSDK 32bit 10.7.20.192. If you really have installed v0.7.0b, please install the latest (v0.7.3b) and try again. Otherwis...
by hexamer
Wed Feb 24, 2021 12:30 am
Forum: Applications
Topic: Frequency Response Analyzer with Bode Plots
Replies: 548
Views: 313369

Re: Frequency Response Analyzer with Bode Plots

Hi Aaron, I have pushed my curiosity a little bit and tried to export the data to CSV and graph them with Excel. It seems the X values are powers of 10, but I don't understand the Y values for Gain in dB. The values start with -0.5 dB down to -35 dB but the shape is inverted. I have attached the fi...
by hexamer
Mon Feb 22, 2021 3:04 pm
Forum: Applications
Topic: Frequency Response Analyzer with Bode Plots
Replies: 548
Views: 313369

Re: Frequency Response Analyzer with Bode Plots

Is it normal ? I hope not :) I have a suspicion of what's going on here though. For some reason the popup asking you whether you want to use the demo scope does not come to the foreground, so it may look like the application is not running. If you Alt-Tab, do you see it? If this isn't your problem,...
by hexamer
Sun Feb 21, 2021 10:53 pm
Forum: Applications
Topic: Frequency Response Analyzer with Bode Plots
Replies: 548
Views: 313369

Re: Frequency Response Analyzer with Bode Plots

I am happy to announce a new release of FRA4PicoScope: https://bitbucket.org/hexamer/fra4picoscope/downloads/FRA4PicoScope_0.7.3b.msi The primary new features are: Add support for new PicoScope 6000E models (PS6824E, PS6424E, PS6804E, PS6404E, PS6403E) Add support for new PicoScope 4000A models (PS4...