"While the upper-frequency limit of an oscilloscope does determine price, the
effectiveness for some measurements. Some measurements, such as electromagnetic-interference (EMI) testing, require a measurement range that extends well into the audio-frequency range or even with dc measurement capability."
You need that, for troubleshooting EMI on those high-speed d.c. comm links.
Cheers, James
A lot of scopes have terrible low frequency precision. They may have thermal drift, imperfect capacitor dielectric effects, random LF noise, and various forms of mechanical pickup. The complex circuitry that gives them a precision AC gain from 5Hz to 600MHz is just a burden at
0.001Hz.If you want extremely good low frequency precision, use a DVM with a data port.
:-)
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