[sdiy] Oscilloscope on a Budget 200

[Roman Sowa]

Looking a bit further they go for about $60 from China (free shipping).

Why would you need a battery or power bank if you still need USB host to 
provide the display? I'm not sure if they provide an app for phone or 
tablet, probably not. At least my old Hantek did not.
This is the deal, you get cheap scope-ish tool, but display is in your 
PC. OTOH when most of what you do requires big PC monitor anyway (that's 
me), it's kinda advantageous.

Not only the channel bandwidth should be able to catch HF oscillations, 
but sampling frequency must be high enough not to be bitten hard by 
undersampled image. Cheap toy-scopes don't have peak-detect mode and 
just lower sample rate with slower timebase ranges.

Roman

W dniu 2016-06-01 o 12:33, Richie Burnett pisze:
> That looks neat for the price.  Does it have a built in battery, or can
> run from a mobile-phone charging adapter with USB socket for stand-alone
> use? The manual only seems to mention it being plugged into a PC/laptop,
> which might be a bit limiting if it needs the PC Application to work.
>
> It's reassuring to see that it offers proper sinc interpolation as well
> as el-cheapo linear interpolation, to join the dots (samples.)
>
> As someone else mentioned, it's definitely worth getting an oscilloscope
> that goes up to at least 10MHz, even if you work only with analogue
> audio circuits.  Otherwise, if you have an op-amp circuit that is
> oscillating all you will see (and hear) is a distorted audio signal
> coming out, with no idea that the amplifier is in fact oscillating away
> merrily at 3MHz because it's got a little too much cable capacitance on
> it's output.
>
> -Richie,
>
>
> -----Original Message----- From: Roman Sowa
> Sent: Wednesday, June 01, 2016 10:48 AM
> To: synth-diy at dropmix.xs4all.nl
> Subject: Re: [sdiy] Oscilloscope on a Budget 200
>
> Or Hantek PSO2020 - it's cool little penscope, so you hold the little
> device in your hand, and instead of regular probe cable, there's USB cable.
> In contrary to other USB scopes, there are physical controls on the
> device to adjust sensitivity, timebase, horizontal and vertical shift.
> I have other 4-ch USB scope from Hantek and operating it with a mouse is
> such a pain that I use it only when I need 4 channels.
>
> I don't have PSO2020 (yet, just foud out about it today) but it's so
> sweet I can't keep my $100 in my pocket not to buy it.
>
> Roman
>
>
> W dniu 2016-06-01 o 11:00, Steve pisze:
>> Well, before you buy some perhaps dodgy DIY kit, you might as well buy
>> something like this:
>>
>> Hantek 6022BE
>> https://www.amazon.com/Hantek-HT6022BE20Mhz-Digital-Oscilloscope-Bandwidth/dp/B009H4AYII?ie=UTF8&*Version*=1&*entries*=0
>>
>>
>> A PC / USB based scope. Not as nice usability wise than a stand-alone
>> scope.
>> But at least it has some features... and it's nice that it has 20 MHz
>> bandwidth (well, with 48MS/s I doubt 20MHz signals can be looked at
>> nicely... but a few MHz at least).
>> I would not like to be restricted to some scope that does only kHz even
>> for audio. Why? E.g. because perhaps you'd like to make sure that your
>> circuits do indeed output only hearing range frequencies.
>>
>> Steve
>>
>> *Gesendet:* Mittwoch, 01. Juni 2016 um 05:09 Uhr
>> *Von:* "Trevor Cunningham" <chalktech at gmail.com>
>> *An:* Rob <roomberg at ptd.net>
>> *Cc:* "synth-diy at dropmix.xs4all.nl" <synth-diy at dropmix.xs4all.nl>
>> *Betreff:* Re: [sdiy] Oscilloscope on a Budget 200
>> Great advice, thank you.
>>
>> On Tuesday, May 31, 2016, Rob <roomberg at ptd.net> wrote:
>>
>>     $200 is a little bit too much to spend on a tool.... for a lot of
>>     people.
>>
>>     I definitely could not afford a $200 analog scope 20 years ago when
>>     I had 3 teenagers to feed.
>>     But I did find a 20mhz scope in a flea market that works great and
>>     it only cost me $20.
>>
>>     I bought the cheap digital scope  for KILOhertz  audio frequency
>>     circuits.
>>     Its just a really good match for cash strapped newbies playing with
>>     electronics who are not
>>     straying into radio frequencies.
>>
>>     I wish I had one of these 50 years ago.
>>     I would have learned a lot more about electronics.
>>
>>
>>     On 05/31/2016 09:04 AM, Mattias Rickardsson wrote:
>>
>>         When it comes to oscilloscopes I have only two recommendations:
>>
>>         Spend 200 bucks on an old analog scope and sell it if you don't
>>         like it,
>>         or
>>         spend 200 bucks on a new digital scope and throw it if you don't
>>         like it.
>>
>>         I know which alternative I'd prefer, and it's not just because I
>>         like
>>         old analog scopes. ;-)
>>
>>         PS: Here's my CV: https://goo.gl/photos/TFh1LVewFRxWPfUFA
>>
>>         /mr
>>
>>         On 31 May 2016 at 11:05, Gordonjcp <gordonjcp at gjcp.net> wrote:
>>
>>             On Tue, May 31, 2016 at 11:22:23AM +0300, Trevor Cunningham
>>             wrote:
>>
>>                 If being cheap in the short will just cost me money in
>>                 the long run, please
>>                 advise. I'm just looking for a scope that will be
>>                 reliable with modular
>>                 kits. The more money I have to build kits with, the
>>                 happier I am.
>>
>>             Buy a dual-trace analogue 'scope that will go to about 20MHz
>>             from someone near enough to go round and see it working.
>>             There's this online auction site that'll probably help there.
>>
>>             Digital 'scopes are either hideously expensive or terribly
>>             limited.
>>
>>             My 20MHz Iwatsu dual-trace is just about never switched
>> off...
>>
>>             --
>>             Gordonjcp MM0YEQ
>>
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