30 Dec '13, 12am

11 Inexpensive Portable Test Tools that work

I've been using the Analog Discovery for two weeks now, and had been experimenting with Digilent's Waveforms software (a free download from www.digilentinc.com) for a week or two before that. Nearly everything I've tried works the way one would expect it to work. One "gotcha" is that while the AWG can produce nearly 10 Vpp waveforms, you can't get one half of that when you use 50 ohm source impedance and drive a 50 ohm load; there is an approximately 20mA current limit on the outputs. If you stay below that current level, the spectrum analyzer indicates mid-60;s or better for THD. Another "strangie" I have yet to resolve is why a 1-second 20 Hz to 20 KHz sweep commences with a linear ramp for the first millisecond or so. I just posed this second problem to Digilent's support folks two days before Christmas, when they were already on a holiday break, but I'm sure they will ...

Full article: http://www.eetimes.com/document.asp?doc_id=1320482&page_n...

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