Measuring impedance with oscilliscope |
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JonB67
Young Croc Joined: 22 April 2016 Location: UK Status: Offline Points: 1376 |
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Posted: 30 March 2017 at 8:02am |
I've been offered an oscilloscope (two actually)
Am I right on thinking I can use this to tune the box by using it to measure impedance? If so it's not a piece of equipment ive used before, and im at the point of needing to tune my ports, how do i use it? Jon Edited by JonB67 - 30 March 2017 at 8:06am |
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odc04r
Old Croc Joined: 12 July 2006 Location: Sarfampton Status: Offline Points: 5483 |
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Well you could, if you have a sine wave generator and feel like writing down lots of numbers and drawing a graph. Or you could just use PC software with a standard soundcard and a 10 Ohm resistor. Which is a lot easier.
E.g. https://www.roomeqwizard.com/help/help_en-GB/html/impedancemeasurement.html |
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studio45
Old Croc Joined: 16 October 2007 Location: United Kingdom Status: Offline Points: 3863 |
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Hey, if someone wants to give you two oscilloscopes for nothing, get them...if nothing else it will make your workshop look really cool.
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Studio45 - Repairs & Building Commotion Soundsystem -Mobile PA
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JonB67
Young Croc Joined: 22 April 2016 Location: UK Status: Offline Points: 1376 |
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Ok ok, point taken!
Never learn if you don't ask though. I'll use REW as you suggest. Cheers. Edited by JonB67 - 30 March 2017 at 7:38pm |
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gen0me
Young Croc Joined: 20 February 2016 Location: UK Status: Offline Points: 999 |
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You can also use your sound card as generator. One oscilloscope parallel to speaker second parallel to resistor in series with speaker.
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odc04r
Old Croc Joined: 12 July 2006 Location: Sarfampton Status: Offline Points: 5483 |
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No reason why you can't do it with your oscilloscope if you want to, it'll give you a good appreciation of the process. It's how people used to do it before automated measurements came along! See if you get the same results with both techniques.
Also if you have the chance to get a scope for free as said do it anyway, they have many applications. You can even check your car timing with them if you are inclined to! Diagnose broken equipment, etc |
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ceharden
The 10,000 Points Club Joined: 05 June 2005 Location: Southampton Status: Offline Points: 11776 |
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The one thing I will add is that osciloscopes are very good for getting a picture of what's going on but aren't good for accurate measurements of Voltages. You'll be able to get a picture of where the impedance peaks and dips are but you won't be able to measure accurately what the impedance is.
If you're going to do it manually, a true RMS multimeter is probably better. Incidentally I still often do impedance measurements using a resistor, a multimeter and a spreadsheet!
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snowflake
Old Croc Joined: 29 December 2004 Location: Bristol Status: Offline Points: 3118 |
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ocsilloscopes are handy but there is a much simpler way of tuning a port - stick a piece of paper in front of it and see when it flaps about most.
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