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Jul. 24th, 2019 12:29 pm![[personal profile]](https://www.dreamwidth.org/img/silk/identity/user.png){kind=small}
stormdogI guess I have a question for an electronics forum. But just in case one of my readers has an answer, and for my own records about what I've been up to.
I built a little stroboscope from a Velleman kit I bought at Am-sci. It's a good, simple device and soldering it all together was straight-forward. I planned to use it, along with a printable timing disc, to time my turntables. It It has an adjustable blink rate, so I got the blink signal on my oscilloscope and adjusted it as close as I could to spot-on 60 hz. (60hz is the nominal mains line frequency [in the US] so it's a handy timing reference that everyone has available.) But when I used it to check the timing on my turntable with an integral mains-frequency stroboscopic timer, the two did not agree.
What do you do when different pieces of equipment do not all agree? What do you do if you need a really solid frequency standard to check your equipment against? How do I tell if my oscilloscope is out of calibration?
Thinking about it more, I may have gotten some math wrong when mixing base-ten with base-sixty units, so I'll play around with it again tonight and do math on paper instead of in my head. I'd still like to know about good options for a frequency standard.
I built a little stroboscope from a Velleman kit I bought at Am-sci. It's a good, simple device and soldering it all together was straight-forward. I planned to use it, along with a printable timing disc, to time my turntables. It It has an adjustable blink rate, so I got the blink signal on my oscilloscope and adjusted it as close as I could to spot-on 60 hz. (60hz is the nominal mains line frequency [in the US] so it's a handy timing reference that everyone has available.) But when I used it to check the timing on my turntable with an integral mains-frequency stroboscopic timer, the two did not agree.
What do you do when different pieces of equipment do not all agree? What do you do if you need a really solid frequency standard to check your equipment against? How do I tell if my oscilloscope is out of calibration?
Thinking about it more, I may have gotten some math wrong when mixing base-ten with base-sixty units, so I'll play around with it again tonight and do math on paper instead of in my head. I'd still like to know about good options for a frequency standard.
