Vibration Test Equipment
Vibration Test Equipment
(OP)
Hello everyone. This is my first post so please bear with me if it is not relevant. I rebuild vintage analog audio turntables and in the process I try new materials and/or products to improve them. I am in need of some vibration testing equipment so I can validate the results of my labors. The turntables incorporate belts, pulleys, idler wheels, small electric motors, etc. Can anyone recommend equipment to suit my needs? Thank you very much. Jim





RE: Vibration Test Equipment
Unfortunately lab quality high frequency accelerometers and mics are expensive, as are their conditioning amps. You may be able to get secondhand ones, as people are replacing individual battery powered systems with racks of 24 and 48 channel units.
I'd recommend B&K gear, the 2635 charge amp in particular, choice of accelerometer is tricky as sensitive ones tend to be big and heavy.
I might be being a bit over the top, the only thing that really matters is the signal transmitted by the needle, why not just analyse that?
Cheers
Greg Locock
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RE: Vibration Test Equipment
Have Fun!
James A. Pike
www.xl4sim.com
www.erieztechnologies.com
RE: Vibration Test Equipment
Jim
RE: Vibration Test Equipment
You have several choices ranging from new purchase, used purchase, rental, and borrow. I could make suggestions, but I would need to know your general ability/experience with vibrations and budget. A tiny, but sensitive, accelerometer connected to a spectrum (FFT) analyzer is probably what you are thinking of. A PVF accelerometer, USB sound card, and PC software could cost less than $500.00 with "some assembly required". Measurements from the audio signal with a precision source record might be more effective than vibrations! Drive components can affect table radial and torsional vibrations (wow and flutter) and also shake the tone arm. You could consider making precision digital recordings of various test configurations and then have someone do the signal analysis for an hourly fee.
Walt
RE: Vibration Test Equipment
Cheers
Greg Locock
New here? Try reading these, they might help FAQ731-376: Eng-Tips.com Forum Policies http://eng-tips.com/market.cfm?
RE: Vibration Test Equipment
RE: Vibration Test Equipment
Adding measurements equipments will add weight to the arm, affecting its behavior.
RE: Vibration Test Equipment
Cheers
Greg Locock
New here? Try reading these, they might help FAQ731-376: Eng-Tips.com Forum Policies http://eng-tips.com/market.cfm?
RE: Vibration Test Equipment
And ultimately, any vibration not picked up by the pickup is irrelevant, and any vibration picked up by some other sensor will need to be proven to be a problem during playback, wouldn't it?
TTFN

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RE: Vibration Test Equipment
Audio system measurements
From Wikipedia, the free encyclopedia
Pasted from <http://en.wikipedia.org/wiki/Audio_system_measurem...;
The Ultimate Analogue Test LP
Pasted from <http://www.analogueproductions.com/index.cfm?do=de...;
ARTA software - a collection of programs for audio measurements and analysis in acoustical and communication systems. ARTA software uses standard and professional PC sound cards and interfaces for audio signal acquisition and generation.
Pasted from <http://www.artalabs.hr/index.htm>
You can always add an accelerometer for vibration measurements, but you need to know what background frequencies are affecting sound output first.
Walt