Search found 25 matches

by jkahrs
Tue Feb 15, 2011 5:03 pm
Forum: General Software Discussions
Topic: Streaming mode ps4000
Replies: 5
Views: 3917

Re: Streaming mode ps4000

This sounds like you are ignoring the return values when setting the parameters. You seem to try to set 75 ns and ignore that the driver tells you it can't do that. Your device is a ps4000 while mine is a ps2205 and still I can sample at a sample rate of 1 MHz with a Netbook CPU. With a faster CPU a...
by jkahrs
Mon Feb 14, 2011 7:48 pm
Forum: General Software Discussions
Topic: How to select Channel B (2203 + Delphi 7)
Replies: 3
Views: 3039

Re: How to select Channel B (2203 + Delphi 7)

I have the same problem with PS2205 running on Linux. As suggested by you, I set up the properties of the channel before using ps2000_run_straming_ns, but I never succeeded in getting anything other than 0 bytes on channel B. As suggested by you, I never tried to change the channel during acquisitio...
by jkahrs
Mon Feb 14, 2011 7:39 pm
Forum: General Software Discussions
Topic: Streaming mode ps4000
Replies: 5
Views: 3917

Re: Streaming mode ps4000

I had similar problems with PS2205 and most of the problems could be solved by studying the manuals thoroughly. In your case this should be pages 10 to 17: http://www.picotech.com/document/pdf/ps4000pg-en-5.pdf The time in between samples for 6 MHz should be 166 ns and not 75 as suggested by you. Ap...
by jkahrs
Thu Feb 10, 2011 6:56 pm
Forum: Linux
Topic: fast streaming mode in PS2000 with 5MS/s
Replies: 18
Views: 21060

Re: fast streaming mode in PS2000 with 5MS/s

I just re-read your USB streaming guide and there was something I overlooked when I first read the PDF file. I understood that 30 MB/s is the maximum reliable data rate over a USB connector. Is it true that the PS4000 series delivers data at that rate, giving me about 15 MS/s continuously ?
by jkahrs
Sat Feb 05, 2011 7:56 pm
Forum: Linux
Topic: Linux driver for USB DrDAQ
Replies: 10
Views: 12166

Re: Linux driver for USB DrDAQ

If you are interested in a speculation about their IP: I can only guess, but it might be that the driver is downloading some binary file (firmware) to the USB device at initialization. If they reveal how this mechanism works, developers could try to do strange thinks; possibly destroying the device....
by jkahrs
Mon Jan 31, 2011 7:29 pm
Forum: Linux
Topic: fast streaming mode in PS2000 with 5MS/s
Replies: 18
Views: 21060

Re: fast streaming mode in PS2000 with 5MS/s

Hello Chris, yes I can reproduce the problem on Windows XP with PicoScope 6. At a comparable sample rate PicoScope absorbs almost as much CPU cycles as my application. Notice that I never use the function ps200_stop(), except for the termination of my application. When I began writing my application...
by jkahrs
Sat Jan 29, 2011 11:22 am
Forum: Linux
Topic: fast streaming mode in PS2000 with 5MS/s
Replies: 18
Views: 21060

Re: fast streaming mode in PS2000 with 5MS/s

I have completed the first version of my AM radio receiver now. Here is an example of what I received last night: http://www.vr-web.de/~Juergen.Kahrs/sample_2011-01-28_240000Hz_1.mp3 The signal quality is so poor because I sample the antenna at 1 MHz, which is way too low for serious work. When I lo...
by jkahrs
Mon Jan 10, 2011 8:45 am
Forum: Linux
Topic: Picoscope 6 can be made to run with linux/vista/virtualbox
Replies: 4
Views: 7309

Re: Picoscope 6 can be made to run with linux/vista/virtualb

The same can be done for PS2205 with OpenSuSE 11.3, VirtualBox 4 and Windows XP. I have spent many hours using the PicoScope application this way and I can confirm that this way of using PicoScope is not a strange toy but ready for doing serious work. Some details of installation: OpenSuSE 11.3 is t...
by jkahrs
Thu Jan 06, 2011 6:35 pm
Forum: Linux
Topic: fast streaming mode in PS2000 with 5MS/s
Replies: 18
Views: 21060

Re: fast streaming mode in PS2000 with 5MS/s

Block mode is not an option for me. I want to implement an SDR (software defined radio), that's why I need a continuous stream. 1 MS/s is indeed the maximum rate that I found by trial&error to work continuously. After these experiments I am considering to buy a new PC with at least 3 GHz clock rate....
by jkahrs
Fri Dec 31, 2010 2:28 pm
Forum: Linux
Topic: fast streaming mode in PS2000 with 5MS/s
Replies: 18
Views: 21060

fast streaming mode in PS2000 with 5MS/s

Hello, did anyone ever use PS2205 in fast streaming to acquire 5 MS/s continuously ? To me it looks like the Linux drivers have a speed limitation. I did some more testing and the same problem occurs on Windows XP. Is it possible that my slow CPU (Intel Atom 330, dual core 1.6 GHz) prevents me from ...