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HobbyLab 2 Channel OSC
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HobbyLab 2 Channel OSC

by dataknife on Wed Jul 21, 2010 4:25 pm

I'm looking for a low budget OSC and came across this one http://www.hobbylab.us/- I poured through the epic osc thread from earlier and am not really sure if this is a good one for someone who's new to the hobby and can't get away with spending more than about 150$ on something without drawing spouse aggro...

It might be a nice addition to the site to have a basic checklist on what a scope MUST have for us N00Bs...
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Re: HobbyLab 2 Channel OSC

by madworm_de on Thu Jul 22, 2010 7:03 am

bandwidth: 100 kHz per channel


DON'T pay 150$ for something like this! Even a simple Arduino board can produce signals way faster than this, and you won't be able to measure these properly with this "oscilloscope". This device is hardly better than what an el cheapo sound-card can do. And you always need a computer for this... yuck.
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Re: HobbyLab 2 Channel OSC

by Entropy on Thu Jul 22, 2010 11:49 am

Yeah, it's a pretty lame device. There is very little in this price range that is actually good.

As a matter of comparison, the Rigol DS1052E is around 2.5 times the price ($400) but has 500 times the bandwidth. (50 MHz vs 100 kHz) and probably a similar advantage in terms of sample rate (more important than analog bandwidth in a DSO - a lot of the cheap PC-based DSOs advertise analog bandwidths that they simply don't have the sample rate to support. The general rule of thumb is that if you don't see a sample rate 5-10 times that of the analog bandwidth, you won't be able to use all of the claimed analog bandwidth for most signals.)
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Re: HobbyLab 2 Channel OSC

by micbsv on Thu Jul 22, 2010 4:30 pm

>This device is hardly better than what an el cheapo sound-card can do.

Actually it's not quite right. Besides the low bandwidth it's a pretty good device that can be a whole lab on your workbench. Besides that the bandwidth of the Logic Analyzer is 4MHz which is enough for the most of digital projects on AVR/Arduino or PIC.

Check the interfaces decoder part, for example. No one ship device has this kind of functionality:
http://www.hobbylab.us/Oscilloscope/Help/UART.aspx

So, you you are going to work with analog signals in sound range the device may be pretty good for you.
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Re: HobbyLab 2 Channel OSC

by madworm_de on Thu Jul 22, 2010 4:44 pm

Yes, the logic analyzer is a different story. But the OP wanted an oscilloscope ;-)
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Re: HobbyLab 2 Channel OSC

by Myrmidon on Fri Jul 23, 2010 7:37 am

Err 4MHz bandwidth for the logic analyzer isn't great at all. That only means your gonna be able to analyze signals around 400KHz. (divide by 10 rule) And as the arduino can be up in the ranges of 8/16MHz.....see where i'm going with this?

You'd be far better off getting a saleae logic analyzer, or better yet, the OpenBench Logic Sniffer. Just got one myself and it's great at $45! And it's open source and upgradeable, so the sample memory will in time be higher. It's Bandwidth is 100/200MHz (10-20MHz signals).

DO NOT pay $150 for that oscilloscope/la combo! You could get a fairly decent analog oscilloscope on ebay AND the logic sniffer for under $150.

;)
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