I keep fiddlin around with various mad schemes to damp vibration in both turntables and speaker cabinet walls - while the calibrated knuckle rap is somewhat useful -would be nice to be able to actually measure in a repeatable manner what I'm doing ? I see vibration testers on places like Amazon - guess my question is what should I be shopping for in order to test and store comparative results ? I know it will incorporate a accelermeter accelermometer ? -but am lost past that point ?
Vibration
The HP 3561A is more or less purposemade to analyze vibration. I used it to analyze vibration in cabinets years ago. Still have one on my bench.
Maybe you wanted something cheaper / simpler?
Regards
RMalmin
The HP 3561A is more or less purposemade to analyze vibration. I used it to analyze vibration in cabinets years ago. Still have one on my bench.
Maybe you wanted something cheaper / simpler?
Regards
RMalmin
I build George Ntanavaras test unit which uses an accelerator sensor and a box with some analog electronics. Works like a charm. It was an audioXpress article in 2013 I believe. You can check with the author gdan at otenet dot gr
Jan
thanks -gonna see if George has boards
The H-p looks very nice - but is far outside my means - what George put together may do the trick -he's also got a pretty neat device to decide if your amp can actually push your speakers device in the current issue - woulda loved that when I was selling/servicing audio equipment - I remember trying to explain to john Bowers American hi-fi habits " Customers will buy expensive speakers -but they'll routinely hook those speakers up to pathetic amplifiers".
The H-p looks very nice - but is far outside my means - what George put together may do the trick -he's also got a pretty neat device to decide if your amp can actually push your speakers device in the current issue - woulda loved that when I was selling/servicing audio equipment - I remember trying to explain to john Bowers American hi-fi habits " Customers will buy expensive speakers -but they'll routinely hook those speakers up to pathetic amplifiers".
For vibration analysis it's helpful to have a lower frequency limit in the micro Hertz! You can purchase a number of evaluation modules from Texas Instruments, Analog Devices or Linear Tech (among others) which suit. Some of these are around $50, others run several hundred $.
Tone-Arm frequency of resonance is in the single Hertz, and will intermodulate a fundamental signal quite strongly. Good question!
Edit: Forgot to mention -- HP has quite a few application notes for vibration measurement and they can be found by searching on the product -- the notes come up right away.
Tone-Arm frequency of resonance is in the single Hertz, and will intermodulate a fundamental signal quite strongly. Good question!
Edit: Forgot to mention -- HP has quite a few application notes for vibration measurement and they can be found by searching on the product -- the notes come up right away.
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Thank you Jan for your kind words.
I use the ACH-01 accelerometer for vibration analysis along with my accelerometer amplifier.
If you are interested, you could find more information here:
http://www.diyaudio.com/forums/equipment-tools/267734-accelerometer-testing-loudspeaker-drivers.html
I use the ACH-01 accelerometer for vibration analysis along with my accelerometer amplifier.
If you are interested, you could find more information here:
http://www.diyaudio.com/forums/equipment-tools/267734-accelerometer-testing-loudspeaker-drivers.html
Maybe also provide the article download: http://audioxpress.com/assets/upload/files/George NtanavarasAccelerometer.pdf
Most FFT analyzers are suited for vibration measurements. HP 3561 (mentioned) or a 3560A, which is a portable unit, or others from SRS, HP, OnoSokki, and others. Search on ebay for FFT analyzer to find them. You can get a reasonable unit for $ 500-1000
paul
paul
The SRS (Stanford Research) units are easier to program than the HP and much less expensive.
But they are still much more expensive than an EVM module and a laptop.
But they are still much more expensive than an EVM module and a laptop.
thanks for info
Reasonably familiar with standard service bench equipment - but have no experience measuring vibration so the responses have led to a lot of clicking and googling. Gdan's unit looks like it would do the job for me and is pretty affordable . Now I gotta just start ordering parts.
Reasonably familiar with standard service bench equipment - but have no experience measuring vibration so the responses have led to a lot of clicking and googling. Gdan's unit looks like it would do the job for me and is pretty affordable . Now I gotta just start ordering parts.
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