During a typical vibration data collection, how much time is needed (by the analyzer) to take a reading from a bearing housing of a small motor?

I'm not sure if this is clearly taught in the vibration courses (Category I) or if a person without first-hand experience in data collection can have a feeling of the required time.

Comments are welcome.

This page is from "Data Acquisition" Part 2 of Vibration Analysis Certification Exam Preparation Package. It contains more than 150 practice questions on Data Acquisition for Cat I. Amazon Link: https://www.amazon.com/gp/book...ref=dp_st_1644150093

Regards- Ali M. Al-ShurafaVibration Analysis Certification Exam Category I Data Acquisition Question 147

Regards- Ali M. Al-Shurafa

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I think this question should be reworded.  You state "...how much time is needed (by the analyzer) to take a reading..." but that is not what is implied in the question since there is no "(by the analyzer)".... I could be easily stumped since amount of time could imply installing sensor, locating data point on the analyzer, etc.

Also, VI Cat II notes are provided to the students with most (all?) formulas required to take the exam. So if your intent is ensure the student understand total DAT, then you should provide "typical" values for # lines, frequency span and # averages.   

Regards

Jim P

 

@ Ali M. Al-Shurafa,

Quote:

"During a typical vibration data collection, how much time is needed (by the analyzer) to take a reading from a bearing housing of a small motor?" Unquote:

This quote: "During a typical vibration data collection",,,,,  sort of tells me that the question is directed toward a basic route's  measurement point's setup in the database with sufficient Fmax and # of lines, as does your quote: "(by the analyzer)": unquote.

With the "listed" times from the question's possible answers, I would chose, "B": "0.1 to 5 seconds".and have to think or assume the measurement point's  setup is within a reasonable manner, with a decent Fmax and number of lines,

Just my opinion and I could be totally wrong.

Thanks and Have a Great Day,

Ralph

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