Liking Analog Meters Doesn't Make You a Luddite (Video)
Chris Gordon works for a high-technology company, but he likes analog meters better than digital readouts. In this video, he shows off a bank of old-fashioned meters that display data acquired from digital sources. He says he's no Luddite; that he just prefers getting his data in analog form -- which gets a little harder every year because hardly any new analog meters are being manufactured. (Alternate Video Link)
Digital meters don't have the slow response that d'Arsonval meter movements have, unless extra circuitry is added. The inertia and magnetic delay of old-fashioned electro-mechanical meters naturally filter fast variations in the signal, and can result in a useful reading in cicumstances where the average digital meter produces a garbage reading. Of course, it's also good to know when a signal is noisy or jumpy...
I use digital meters exclusively these days - they're convenient, rugged, light, and have a higher input impedance and better resistance reading capabilities than all but the very best of the old analog FET-VOM's. But every once in a while I wish I had a well-damped analog meter to save me from dragging out the scope.
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The other place analog (or analog-style) gauges shine is when the rate of change is more important than the value. Speedometers and tachometers are good examples: You usually care more if you are speeding up, slowing down, or keeping the same speed than whether you are going 65 or 66mph.
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