Sign up Calendar Latest Topics Donate
 
 
 


Reply
  Author   Comment  
Hvac_vibe

Member
Registered:
Posts: 20
Reply with quote  #1 
I know this probably should be in the equipment forum, but there seems to be more traffic here.  Can anyone tell me if Logarithmic scaling of the bottom Axis is available in Ascent?  I can't find it for the life of me. 
John from PA

Sr. Member
Registered:
Posts: 963
Reply with quote  #2 
This is for a vb1 so not sure it will help.

vb1 help.jpg 

Aubrey

Avatar / Picture

Sr. Member
Registered:
Posts: 87
Reply with quote  #3 
Like John indicates, right click in the bottom or left scale and choose log.

I use it now and then. But have a time remembering where it is located.




__________________
Aubrey
Walt Strong

Sr. Member
Registered:
Posts: 889
Reply with quote  #4 
From the responses above, it appears that log scale for X-axis (Frequency) is not available.

Walt
John from PA

Sr. Member
Registered:
Posts: 963
Reply with quote  #5 
Quote:
Originally Posted by Walt Strong
From the responses above, it appears that log scale for X-axis (Frequency) is not available.

Walt


As I think about it Walt is probably correct.  The graphic I initially attached it titled "Amplitude Scale" and thus infers the vertical or Y-axis.  In the content however it states "Either linear or log scale can be chosen for the bottom axis."  Bottom axis, meaning the X-axis, is usually the frequency scale.

I have worked with many instruments that allow both the X and Y axis to be logarithmic together or independently.  Usually these instruments have functionality intended for acoustics.

Another common reason why log scales are used is that many curves become straight lines on a log–log scale (both the x-scale and y-scale are logarithmic).  This for example is valid for curves which are exponential expressions, for instance y = xa.  Log–log plots are common for plotting filter characteristics.

Cam Wilson

Avatar / Picture

Member
Registered:
Posts: 13
Reply with quote  #6 
You can change the left axis to logarithmic scale but I haven't seen any option for the bottom axis to be changed to log scale in Ascent.
The options for the bottom scale are frequency, orders in the spectrum and in the TWF is the same also with time, revolutions and phase included.
I will have another look soon but pretty sure that there isn't the option for logarithmic scale.
Walt Strong

Sr. Member
Registered:
Posts: 889
Reply with quote  #7 
"Usually these instruments have functionality intended for acoustics."

Log-Log scale (both X & Y axis) is also used for structural testing. The old CSI MasterTrend software supports Log-Log scales, and I assume the current version of Emerson-CSI RBM-ware does as well.

Walt
Previous Topic | Next Topic
Print
Reply

Quick Navigation:

Easily create a Forum Website with Website Toolbox.