I decided not to wait for a review and nabbed one. Got it from eBay for $80 with shipping (Skip the ones that are $40 + $30 shipping, you'll only get $40 back if something is wrong, be sure to get the "all in price"). Mine took less than 1 week to arrive from China. I did pay an extra $2.50 for "expedited shipping" that appears to be worth it.
The device is a ripoff of one of These, but made in China. Capabilities are similar from what I've read and watched on videos. I would have gotten the Seed version if they had any in stock when I was looking.
Size is a bit smaller than a Droid phone. Comes with a nice x10/x1 switchable probe (no compensation though).
Firmware updating is simple, a few to choose from, but didn't help the UI much.
It is advertised as "1Mhz", but is only useful to around 100-200kHz, the same "overrating" needed for Analog scopes. I will still use a Tek for anything over about 50kHz.
Biggest downside (other than bandwidth and UI), is that it is DC Coupled only, and the interface is best described as "kludgy".
There ARE good parts:
Extremely Portable
Floating ground
Excellent performance in audio range, and up to around 40kHz it gives a great rendition of waveforms, though on a smaller screen, compared to my Tek.
Square Wave overshoot is merely an extra pixel or two on the leading edge rather than the nice sinewave tip the Tek shows. Still, excessive overshoot or undershoot is visible.
At 100kHz+, square waves have sloping edges, and at 200kHz+, the amplitude is incorrect in addition. Above that, the display shows a triangle wave when measuring a squarewave. For Sinewave, it can give you an idea of what is going on though. The DC Coupling (lack of AC coupling) does make checking ripple difficult.
For 555 timers, Triac Circuits (switching probe to x10 allows mains checking), etc, it would be 100% sufficient, especially for $80.
It did NOT come with a 2G SD card (2G is max, doesn't support SDHC). I also had to add a skeleton filesystem after formatting the SD card ($5) with FAT16.
The waveform single event trigger&capture as well as the pause/store screenshot (.BMP) to SD immediately puts it above used analog scopes in the same pricerange.
It cannot be connected to a PC for a better display, it only shows as a mass storage device.
Battery life is very good, for the size. It charges through a Mini-USB port in about an hour.
Stored waveforms can be recalled and overlaid on a new measurement, which does help with the single channel limitation.
Once you get used to navigating the menu, it is very usable, and extremely compact compared to "Standard Scopes".
For the $80-$90 price, I'd suggest everybody that wants a scope and will be working mostly with 555 timers, audio circuits, and serial protocols would be happy.
Conclusion: You Most likely will NOT regret nabbing one of these at the price of $80 or less ! (unless you want to work with RF or measure a CPU clock). The "Bang For Buck" factor is extremely high with this unit.
They are coming out with a dual channel, 30Mhz version for $300-ish, I'm eager to try it out when it is released. I'm sure the user interface will have the same limitations, due to lack of space for controls, but the greater bandwidth would make the 30Mhz model a great portable scope, assuming it is accurate to 3-5Mhz.
The device is a ripoff of one of These, but made in China. Capabilities are similar from what I've read and watched on videos. I would have gotten the Seed version if they had any in stock when I was looking.
Size is a bit smaller than a Droid phone. Comes with a nice x10/x1 switchable probe (no compensation though).
Firmware updating is simple, a few to choose from, but didn't help the UI much.
It is advertised as "1Mhz", but is only useful to around 100-200kHz, the same "overrating" needed for Analog scopes. I will still use a Tek for anything over about 50kHz.
Biggest downside (other than bandwidth and UI), is that it is DC Coupled only, and the interface is best described as "kludgy".
There ARE good parts:
Extremely Portable
Floating ground
Excellent performance in audio range, and up to around 40kHz it gives a great rendition of waveforms, though on a smaller screen, compared to my Tek.
Square Wave overshoot is merely an extra pixel or two on the leading edge rather than the nice sinewave tip the Tek shows. Still, excessive overshoot or undershoot is visible.
At 100kHz+, square waves have sloping edges, and at 200kHz+, the amplitude is incorrect in addition. Above that, the display shows a triangle wave when measuring a squarewave. For Sinewave, it can give you an idea of what is going on though. The DC Coupling (lack of AC coupling) does make checking ripple difficult.
For 555 timers, Triac Circuits (switching probe to x10 allows mains checking), etc, it would be 100% sufficient, especially for $80.
It did NOT come with a 2G SD card (2G is max, doesn't support SDHC). I also had to add a skeleton filesystem after formatting the SD card ($5) with FAT16.
The waveform single event trigger&capture as well as the pause/store screenshot (.BMP) to SD immediately puts it above used analog scopes in the same pricerange.
It cannot be connected to a PC for a better display, it only shows as a mass storage device.
Battery life is very good, for the size. It charges through a Mini-USB port in about an hour.
Stored waveforms can be recalled and overlaid on a new measurement, which does help with the single channel limitation.
Once you get used to navigating the menu, it is very usable, and extremely compact compared to "Standard Scopes".
For the $80-$90 price, I'd suggest everybody that wants a scope and will be working mostly with 555 timers, audio circuits, and serial protocols would be happy.
Conclusion: You Most likely will NOT regret nabbing one of these at the price of $80 or less ! (unless you want to work with RF or measure a CPU clock). The "Bang For Buck" factor is extremely high with this unit.
They are coming out with a dual channel, 30Mhz version for $300-ish, I'm eager to try it out when it is released. I'm sure the user interface will have the same limitations, due to lack of space for controls, but the greater bandwidth would make the 30Mhz model a great portable scope, assuming it is accurate to 3-5Mhz.