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Software => Software => Topic started by: RobD on June 02, 2008, 05:07:35 PM

Title: Logic Analyzer Recommendations?
Post by: RobD on June 02, 2008, 05:07:35 PM

Before I fork over $170 I thought I would get some feedback from anyone that has tried the Logic Analyzer from Hobbylabs http://www.hobbylab.us/USBOscilloscope/Home.htm (http://www.hobbylab.us/USBOscilloscope/Home.htm)

I was also looking at a free utility http://www.xs4all.nl/~jwasys/old/diy2.html (http://www.xs4all.nl/~jwasys/old/diy2.html)

Any user feedback on these, if any, would be appreciated!  Thanks!

Rob

Title: Re: Logic Analyzer Recommendations?
Post by: ALZ on June 02, 2008, 11:02:03 PM

Hi:

The Oscilloscope part doesn't seem to have a high enough bandwidth to be of any real use.

Also the logic analyzer is a little slow. Microcontrollers can run at 20 MHZ

 Logic analyzer:   
- number of channels 16 (8 if logic generator is on)
- sample rate 1 KHz … 8 MHz


"Oscilloscope, spectrum analyzer:   
- number of channels 2
- sample rate 100 Hz … 200 KHz
- memory depth   
      buffer reading:  1126 sample/channel (1 channel), 563 sample/channel (2 channels)
      pipe reading: 64K sample/channel (1 or 2 channels)
- input voltage -20 … +20 V (hardware 2 sub-band)
- input impedance 1 MOm
- ADC capacity 10 bits
- triggering absolute (for rising/falling edge),
differential (for difference between adjacent samples),
external (for rising/falling edge of TTL levels) 
- window functions Hamming, Hanning, Blackman, Blackman-Harris "

Title: Re: Logic Analyzer Recommendations?
Post by: RobD on June 03, 2008, 05:42:27 AM

Hey Thanks!  I didn't think about the speed aspect of the logic analyzer since I've never used one before.  I think I'll keep looking around for now.

I"m gonna try the homebrew analyzer this evening and see how it works with my old I2C receiver tuner I built last fall.  It runs at 10MHZ.

Thanks again,
Rob