'$199 logic analyzer, more info'
|I got this information from Proboard about their $199 logic analyzer,
in response to questions prompted by someone else's experience with
the unit. It sounds like many of the shortcomings have been addressed,
and I intend ordering one.
Proboard are e-mailable at aol.com.proboard1
1) The programmable triggering circuitry on our standard unit only reads the
first 8 inputs and compares them to your software selected 8 bits to control
You can either use the external trigger, the external clock, or additional
attachments to the hardware to gain a full complement of 24 programmable
Incidentally, one of our past customers has developed a simple expansion to
his unit which not only provides the full complement of 24 programmable
triggers, but also a multi level triggering feature! He will be providing
this expansion as an accessory after it is completed.
2) The hardware has jumper settings to control whether it samples before
your pattern, or after your pattern. However, we have not yet implemented
the software to utilize the pre-condition sampling feature. Regardless, we
have still had several users who have made elaborate arrangements with this
sampling feature. I would be glad to provide you with the documentation to
experiment with this option.
3) I am not sure what you mean by real time monitoring. I believe perhaps
you are comparing this with an oscilloscope that will provide a still image
with a repetitive wave form. This logic analyzer can make repetitive
samples, and display them. However, the beauty of a logic analyzer is to
store data and capture it before it is gone! If your data is repetitive,
then you can probably get away with a simple scope!
4) We now have a 115K baud data transfer rate. Our new software uploads
data in the background, so the user can conveniently analyze the early part
of the data while the remainder is being uploaded transparently. Thus, the
typical time between trigger ing and viewing data on the screen is less than
5) The standard system comes with 8 micro caesar clips which are very
versatile, even for attachment to surface mount leads, along with 16 berg
clips, which are handy for attachment to header. All clips are in sets of
8, and are attached via a rainbow color coded ribbon cable and a female
socket that plugs into the board. You are free to attach other connections
to the standard 0.1" headers on the board.
6) The inputs are buffered via an array of 74LS245's. These are socketed,
and can be easily replaced.
7) Yes, one of the most popular features is the external clock option which
we provide free of charge. This allows users to capture each individuaL
sample only when their external clock is brought low.
Clyde Smith-Stubbs | HI-TECH Software, | Voice: +61 7 3300 5011
hitech.com.au | P.O. Box 103, Alderley, | Fax: +61 7 3300 5246 clyde
http://www.hitech.com.au | QLD, 4051, AUSTRALIA. | BBS: +61 7 3300 5235
HI-TECH C: Compiling the real world...
To the people at ProBoard circuits:
I am glad to see that you have made some considerable enhancements to
the design of your 24-input logic analyzer. As someone who purchased one
of the earlier units without said enhancements and found their lacking to
have rendered the unit nearly useless to most of my purposes, what would I
have to do to upgrade the unit?
Also, w/rt your remark that for "real-time" monitoring a scope would be
better, I personally would still like to have the ability to see within one
video frame any changes on the analyzers' inputs; this should be fairly to
implement: simply clock one sample into each FIFO and then spit out the
read values [should take almost no time at 115,200 or even 9600].
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