The incredible shrinking DSO
|A version of this article appeared in the Test Digest section of the June 2012 issue of Test & Measurement World.|
The DSO Quad oscilloscope is just about the size of a standard business card and only about 13 mm thick.
The DSO Quad uses an ARM cortex M3 (32 bit) processor and integrated FPGA with high speed ADC. There's an internal 2 Mbyte USB-connectable RAM for waveform storage and instrument setups. The 3-in. color display includes channel information/setup along the top and it displays automatic measurements (VMIN, VMAX, VPP, VDC and VRMS and VBATT) along the right side. The unit can also perform channel math functions: A+B, A-B, etc. All these instrument configurations are controlled by toggle switches and a row of buttons along the unit's top edge.
In addition to being a DSO, the DSO Quad is also a signal source. It has two built-in signal generators, an 8 MHz variable-duty-cycle square-wave generator and a 20-kHz function generator (sine, triangle, and sawtooth). These signals come out through a separate connector.
The DSO Quad's firmware is open source and an active group of beta testers and other hobbyists develop additional functionality and make bug fixes. You can download periodic firmware updates from the user group page and load them through the unit's mini-USB connector.
The DSO Quad is available through www.seeedstudio.com/depot/ (under "Hacking and Measurement").
You may access the user forum at www.seeedstudio.com/forum/viewforum.php?f=22.
A YouTube video demonstrates the basic operation.