Sign up Calendar Latest Topics Donate
 
 
 


Reply
  Author   Comment  
xprmntl1

Member
Registered:
Posts: 5
Reply with quote  #1 
Hello guys, ive been using my 2140 for a few years now, and there's one thing that I wish I could change, but have yet to find a setting, or it is possible that it cannot be changed. When taking normal route data acquisition, I have my display window set to dual, spectrum and waveform. Spectrum always displays in velocity, unless of course its a peak view, but my waveform always displays velocity in/sec even though my stored waveform is stored in G's/acceleration. Is there a setting to change this? Or am I stuck with it? I can't remember if my 2130 did this, but it probably did.
Noknroll

Avatar / Picture

Sr. Member / Supporter
Registered:
Posts: 843
Reply with quote  #2 
have you got grouped readings that include a velocity measurement?
I have, and when I take a reading it displays the velocity measurement briefly before moving to the next group of points. The 2130 used to take group readings in order of how they are in the tree structure. The 2140 has a mind of its own and collects data in an order that it sees fit, I have my tree structure set with Vel first then pkv and last is a 10k fmax acc reading. The 2140 takes them in a reverse order. Dont know if this helps but thats just my observation.

fburgos

Sr. Member
Registered:
Posts: 670
Reply with quote  #3 
You are using analog integration and special waveform.
xprmntl1

Member
Registered:
Posts: 5
Reply with quote  #4 
Noknroll-Yes I have many points grouped regular velocity spectrum and peak-view but this happens on non grouped points as well? I don't have any readings that call for a velocity waveform as I prefer to view them in Acceleration.

fburgos-my integration is set to time domain which in my database my waveform stored units. Yeah I do save a special time waveform for every reading but it is displayed in acceleration after data acquisition has been completed so I dont understand why in real time as the averages are being taken that my live view shows it in in/sec?

Here is a photo of my live view during data acquisition 

Attached Images
jpeg live view.jpg (73.55 KB, 6 views)

Shoveldr

Member / Supporter
Registered:
Posts: 89
Reply with quote  #5 
Quote:
Originally Posted by fburgos
You are using analog integration and special waveform.


This.
fburgos

Sr. Member
Registered:
Posts: 670
Reply with quote  #6 
open dbase and check point sensor signal.

analog integration means the data is integrated as its been recorded in velocity
digital integration means the data is recorded in acceleration, apply fft then integrated to velocity.

since you are using special time waveform, your fft waveform (velocity) is deleted/discarted and a new waveform in acceleration is saved for analysis

Attached Images
png Point sensor signal.png (20.02 KB, 9 views)

xprmntl1

Member
Registered:
Posts: 5
Reply with quote  #7 
fburgos- You are correct, I checked my point parameters and analog is selected. I imagine that is a default for RBM wizard as every point I checked had analog selected. If the only way to remedy this is to change every point to digital, I believe I can live with seeing my waveforms in analog lol. Thanks for the explanation though, as it definitely makes sense now.

I guess I always just assumed fft waveforms were taken in acceleration before integration? 
Shoveldr

Member / Supporter
Registered:
Posts: 89
Reply with quote  #8 
Quote:
Originally Posted by xprmntl1
I guess I always just assumed fft waveforms were taken in acceleration before integration? 


That is the way it used to be, but when Emerson added the special time waveform it shifted the default to analog.  It always annoyed me as when working with gearboxes I like to see the time waveform my spectrum was calculated from.

fburgos

Sr. Member
Registered:
Posts: 670
Reply with quote  #9 
You might like to think you can have a high resolution spectrum and high resolution waveform at same time.

My setup is fmax 90x analog integration.
Special waveform 10-15 revs 16256 samples, fmax 480x
xprmntl1

Member
Registered:
Posts: 5
Reply with quote  #10 
Quote:
Originally Posted by Shoveldr


That is the way it used to be, but when Emerson added the special time waveform it shifted the default to analog.  It always annoyed me as when working with gearboxes I like to see the time waveform my spectrum was calculated from.



That's why I dont like viewing the live waveform in velocity. It looks like a bad reading on some machinery and I catch myself hitting reset and taking another reading.
Previous Topic | Next Topic
Print
Reply

Quick Navigation:

Easily create a Forum Website with Website Toolbox.