PicoScope 3224 Oscilloscope
Chaps,
Any thoughts on this - http://www.picotech.com/pc-scope.html·??
Looking at it for use debugging from the Propeller.· Ideally i'd like to be able to capture Video, 115,200baud serial, i2c, general i/o etc
The only issue I can see (not being very "up" on O-scopes) is that at 20ms/s (million samples per/sec) then 512ks (1000' samples) is not long....
Thanks,
James
Any thoughts on this - http://www.picotech.com/pc-scope.html·??
Looking at it for use debugging from the Propeller.· Ideally i'd like to be able to capture Video, 115,200baud serial, i2c, general i/o etc
The only issue I can see (not being very "up" on O-scopes) is that at 20ms/s (million samples per/sec) then 512ks (1000' samples) is not long....
Thanks,
James
Comments
If you want to debug a µC, it's mostly logic. So a LogicAnalyzer would be best.
I have heared the highest praises for the Logicport from Intronix. Even from people that do have a "real" one, because they like the size and fast setup. But I don't have one (yet).
Albeit, no analog signals. Get a crappy CRT-scope for that.
Edit:
Oh my good! For that price and the low bandwidth, I'd really buy a real scope with a real CRT. And who needs 12 bits on a scope?
Nick
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Never use force, just go for a bigger hammer!
The DIY Digital-Readout for mills, lathes etc.:
YADRO
Post Edited (Nick Mueller) : 10/24/2007 10:42:35 AM GMT
Analog would be good - as some of my useages of it would involve ADC type inputs
J
Now really looking at the 3204 - trading higher mhz and sampling capability for less acuracy. (8bit's rather than 12bits)
J
When it says 20 MS/s it is meant for a one-chanel -operation only. You will most like ALWAYS need two, that makes it 10 MS.
Bit this is digital, allowing you to capture digital pulses of 200 ns length with an unclear shape. True analogue signals can be assesses not above 1 MHz!
When your appilcation is as dscribed 100 kHz to 400 kHz, this is absolutely fine; however you should be able to find suitable equipment for that below $200
What counts more are samples/second. The highest *halfway* readable frequency is 1/10 of the sampling rate. So a scope with 20MHz bandwidth and 40Ms/s can only display about 4MHz. Even then, overshots etc. will mostly be missing.
And again, you really don't need 12 Bits, especially if you are on a low budget. (I "only" have a 8bit Tek DSO).
If you are happy with low frequencies, maybe even a soundcard scope might work. Or a Propeller-Scope!? Leaving you money for a USB logic analizer or Propellers to toast.
Others may have a different opinion.
Nick. No, no LeCroy here!
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Never use force, just go for a bigger hammer!
The DIY Digital-Readout for mills, lathes etc.:
YADRO
Except for the video requirements, often a lot cost unit like the one below provides enough options.
http://www.circuit-ed.com/PoScope-Basic-USB-OscilloscopeLogic-Analyzer-P97C5.aspx
Oscilloscope
Spectrum Analyzer
Chart Recorder
Logic Analyzer/Generator
Reading Modes
About The Knob
Filters
Sounds
Statistics
Protocol Analysis Overview
UART Protocol Analysis
SPI Protocol Analysis
I2C Protocol Analysis
1-Wire Protocol Analysis
sample rate
100 Hz … 200 kHz
- memory depth
PoScope Basic USB Oscilloscope/Logic Analyzer
SKU: 7005
PRICE: 195.00
- buffer reading:
1126 sample/channel (1 channel), 563 sample/channel (2 channels)
Raymon mentioned·on another thread that his company found 54 LeCroy scopes for free on some goverment surplus site.
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BioProp: Robotics - Powered by Bioloids and controlled by the Propeller
But when looking through the internet some monthes ago I dicovered this highly interesting Australian link for high(er) quality/low(er) cost products:
www.bitscope.com/
> sample rate 100 Hz … 200 kHz
Umm ... so how can one look at the I2C's signals at the Props 400kHz?
Or the required 115000 Baud?
Nick
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Never use force, just go for a bigger hammer!
The DIY Digital-Readout for mills, lathes etc.:
YADRO
http://www.dynoninstruments.com/index.php
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Timothy D. Swieter
tdswieter.com
One little spark of imagination is all it takes for an idea to explode
thanks for the input - looking into it and reading the advice given i've slightly blown the budget but ordered a pico-scope 3205 - dual channel, sig gen (limited), triggers, 100mhz, 100ms/s, 512k samples.
Other scope's suggested were either out of price range, or didn't have the features (mainly capture memory) that the pico-scope had!
cheers,
James
It uses your Propeller to sample all 32 IO pins at up to 80million samples/second.
Data is sent to the PC where you have a traditional Logic Analyzer interface.
Best of all for Propeller-based projects, you don't have to connect any wires- since the sampling is done at the IO port!
Have a look at the forum discussion or see what other people are doing with Viewport:
http://forums.parallax.com/forums/default.aspx?f=25&m=209676
http://mydancebot.com/products/viewport/applications
V1.2 is still free, the next one features:
- 8 bit analog input up to 40million samples/second or slower for up to 8 channels
- Advanced trigger modes
- Video input- full frame rate, 320x240 into memory and to the pc
- Fuzzy logic engine to support intelligent Propeller applications
Hanno
Two channels @ 60MHz, with great software. Comes with two 60MHz probes.
See the attached pic.
Jim
Since I am more of a unix geek, could someone give me some advice on how to get .net framework downloaded and running so I can run Gear and ViewPort1.2?
Thanks,
Doug
Tektronix 2246 and Hitachi V1100A are not too bad. Four channels 100MHz with 2 channels offering full settings (5mV/div to 5V/div) and 2 with 0.1 and 0.5V/div, good for logic levels with a 1:10 probe.
Possible to find some on Ebay, which DO even work, and for a few 100s US$ / €
Oh BTW _always_ use a 1:10 probe for high frequency signals...
regds to all,
Dom