Re: [Emc-users] OT Cool Tool

[Chris Albertson]

Looks good for what it is  (you have to understand what it is and what it
is not.)

The specs on the scope or pretty low end compared to even an entry level
"real" scope.This device only as 100M samples per sec and 30 MHz
bandwidth where as a $300 DSO from Rigol has 100MHz bandwidth and 1G
samples per sec.  The Sample/sec spec really DOES matter especially off
you are using multiple channels as that sampling rate is the TOTAL rate not
the per channel rate.Even 1G/sec is low for a 16 channel scope

This device would be very useful if you do mostly audio work or need to
decode a serial I2C or SPI bus  or if you are looking at PWM and machine
control signals that never really go above 1MHz

But notice there is no way to hook up a real scope probe.  You are NOT
going to get clear signal into the box unless you can connect a 10X probe.
Mini grabber hookups are not scope probes.  They are OK for logic signals
but not analog.So notice how short they are, there is a reason for that.

Also notice there is no vertical amplifier/attenuator on the box like you'd
find on "real" scope.   So you might not have good sensitivity for
millivolt level signal and can't connect high volt signals (like the ones
going into motors)  The input range is small.BUT you can build
something to condition the signals even as simple as a voltage divider and
denier diode clamp. to allow a 100 volt range.

That said, looks to be worth it IF you like the software and it looks like
you can download and try out the software BEFORE you buy the hardware.

There are competing products but this look like one of the best in its
class,  Saleae has an 8 input unit for a little less, and 16 inputs with
500M sample/sec for more $
and ee101.com has something too that looked good.
Depends on what you want to do mostly  There are LOTS of these out there.
Tis unit is not bad for low speed logical level stuff, debugging firmware
and such.

I ended up with a Rigol D1000z scope, has four analog channels and 1G/sec
samples and can move sample data to PC over Ethernet if needed and with my
100x scope probe I can directly and safely connect to the insides of one of
my vacuum tube amplifies with 600 volts inside.Oh and I bought a  a
Saleae clone on eBay for $12 that works well for low speed logic level
signals.

On Fri, Apr 28, 2017 at 7:38 AM, Jim Craig 
wrote:

> Thought you all might be interested in this cool little tool. I might
> have to add one to the toolbox.
>
> https://www.sparkfun.com/products/13929
>
> Let me know your thoughts.
>
> Jim
>
>
> 
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Chris Albertson
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Re: [Emc-users] OT Cool Tool

[Gene Heskett]

On Friday 28 April 2017 10:38:11 Jim Craig wrote:

> Thought you all might be interested in this cool little tool. I might
> have to add one to the toolbox.
>
> https://www.sparkfun.com/products/13929
>
> Let me know your thoughts.
>
> Jim
>
Its rather cute, Jim, but for me I see 2 problems, both of which keep the 
card in the rfi case.  Either or both might be showstoppers for you too.

BW limited to 30MHz. I have noises that extend to well above 100MHz to 
deal with.

The usb connection for power and ground probably is a ground loop, so it 
will lie to you in strange ways.

But if it has supply and ground isolation, its quite a decent toy for 
troubleshooting servo systems. The lack of bandwidth would make it less 
than usefull for studying stepper systems.

Trade the usb interface for a POE ethernet connection and it would be 
much more usefull because that would probably open the ground loop paths 
quite decently.

Cheers, Gene Heskett
-- 
"There are four boxes to be used in defense of liberty:
 soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author)
Genes Web page 

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Re: [Emc-users] OT Cool Tool

[andy pugh]

On 28 April 2017 at 15:44, Erik Christiansen  wrote:
> Looks like an equivalent to the Bitscope I bought a good part of a
> decade ago ... for about US$750.

And seems moderately expensive compared to the Picoscopes.
https://www.picotech.com/oscilloscope/2000/picoscope-2000-overview

(Not to be confused with Pico-systems)

-- 
atp
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designed for the especial use of mechanical geniuses, daredevils and
lunatics."
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Re: [Emc-users] OT Cool Tool

[Erik Christiansen]

On 28.04.17 09:38, Jim Craig wrote:
> Thought you all might be interested in this cool little tool. I might 
> have to add one to the toolbox.
> 
> https://www.sparkfun.com/products/13929
> 
> Let me know your thoughts.

Looks like an equivalent to the Bitscope I bought a good part of a
decade ago ... for about US$750.

Erik

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[Emc-users] OT Cool Tool

[Jim Craig]

Thought you all might be interested in this cool little tool. I might 
have to add one to the toolbox.

https://www.sparkfun.com/products/13929

Let me know your thoughts.

Jim


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