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Topic: Cheap scope with LCD (Read 9 times) previous topic - next topic

mlindeblom

#90
Jul 28, 2009, 06:29 pm Last Edit: Jul 28, 2009, 06:34 pm by mlindeblom Reason: 1
Quote
... latest firmware support external trigger, but you do need to solder resistor and there is no entrance stage nor connector...


JYETech states there are two ways to get an external trigger: a) like stated above and b) by jumpering pin 12 of J5 to pin 4 of J5 to use the 500HZ test signal output alternately as a 500Hz test signal and external trigger input.

See document at http://www.jyetech.com/Products/LcdScope/DN062-13v01.pdf

johnny126

JYE Tech just created very nice and detailed troubleshooting documentation and posted it on their website.

http://www.jyetech.com/Products/LcdScope/DN062-14v01.pdf

I must admit, that their support is the best.

Now my kit is complete :)

ArduinoAndy

As a rule of thumb, your scope's bandwidth should be
at least five times higher than the fastest digital
clock rate in your system under test.
Ref. agilent.com

16 MHz (Arduino clock speed) X 5 = 80 MHZ bandwidth.

Cheap scope with LCD:
bandwidth = 1 MHZ
This o'scope should be good for signals @ 200 KHZ!

You get what you pay for ...
8-)

"Never trust an Internet bully who insults and makes fun of your level of intelligence."

gnu_linux

It is true, you get what you pay for :)

You have to consider that this is a $49 scope ( assembled ) and is by far the most affordable scope on the market.

The comparable Velleman scopes have approx. 2MHz bandwidth and sell for about $130 and up.

Neither the Jyetech nor the Velleman scope can compare to a $5,000 Tektronix, HP or Rigol scope.

:)

EmilyJane

While I agree you get what you pay for, in many cases, what you get can be quite useful, even if it doesn't cost an arm and a leg.

If you are designing your own Arduino clone and need to find a 10 nsec glitch or are looking for ghostly reflections in a hinky bus design, you obviously need an oscilloscope with a high bandwidth. Our Dr. Lizardo had all the best equipment while he was working on his oscillation overthruster, I'm sure.   8-) 8-) 8-)


However, many applications created with a 16MHz Arduino have repetitive output signals in the kHz range that it would be handy to visualize during design and troubleshooting and in those cases, an inexpensive o'scope would come in real handy.


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